Project import generated by Copybara.

GitOrigin-RevId: 1610e588e497817fae2d9a458093ab6a370e2972

WORKSPACE

@@ -331,7 +331,9 @@ load("@rules_jvm_external//:defs.bzl", "maven_install")
 maven_install(
     artifacts = [
         "androidx.concurrent:concurrent-futures:1.0.0-alpha03",
-        "androidx.lifecycle:lifecycle-common:2.2.0",
+        "androidx.lifecycle:lifecycle-common:2.3.1",
+        "androidx.activity:activity:1.2.2",
+        "androidx.fragment:fragment:1.3.4",
         "androidx.annotation:annotation:aar:1.1.0",
         "androidx.appcompat:appcompat:aar:1.1.0-rc01",
         "androidx.camera:camera-core:1.0.0-beta10",
@@ -376,9 +378,9 @@ http_archive(
 )
 
 # Tensorflow repo should always go after the other external dependencies.
-# 2021-06-07
+# 2021-07-29
-_TENSORFLOW_GIT_COMMIT = "700533808e6016dc458bb2eeecfca4babfc482ec"
+_TENSORFLOW_GIT_COMMIT = "52a2905cbc21034766c08041933053178c5d10e3"
-_TENSORFLOW_SHA256 = "b6edd7f4039bfc19f3e77594ecff558ba620091d0dc48181484b3d9085026126"
+_TENSORFLOW_SHA256 = "06d4691bcdb700f3275fa0971a1585221c2b9f3dffe867963be565a6643d7f56"
 http_archive(
     name = "org_tensorflow",
     urls = [
@@ -399,3 +401,18 @@ load("@org_tensorflow//tensorflow:workspace3.bzl", "tf_workspace3")
 tf_workspace3()
 load("@org_tensorflow//tensorflow:workspace2.bzl", "tf_workspace2")
 tf_workspace2()
+
+# Edge TPU
+http_archive(
+  name = "libedgetpu",
+  sha256 = "14d5527a943a25bc648c28a9961f954f70ba4d79c0a9ca5ae226e1831d72fe80",
+  strip_prefix = "libedgetpu-3164995622300286ef2bb14d7fdc2792dae045b7",
+  urls = [
+    "https://github.com/google-coral/libedgetpu/archive/3164995622300286ef2bb14d7fdc2792dae045b7.tar.gz"
+  ],
+)
+load("@libedgetpu//:workspace.bzl", "libedgetpu_dependencies")
+libedgetpu_dependencies()
+
+load("@coral_crosstool//:configure.bzl", "cc_crosstool")
+cc_crosstool(name = "crosstool")

docs/getting_started/android.md

@@ -16,12 +16,14 @@ nav_order: 1
 
 Please follow instructions below to build Android example apps in the supported
 MediaPipe [solutions](../solutions/solutions.md). To learn more about these
-example apps, start from [Hello World! on Android](./hello_world_android.md). To
+example apps, start from [Hello World! on Android](./hello_world_android.md).
-incorporate MediaPipe into an existing Android Studio project, see these
-[instructions](./android_archive_library.md) that use Android Archive (AAR) and
-Gradle.
 
-## Building Android example apps
+To incorporate MediaPipe into Android Studio projects, see these
+[instructions](./android_solutions.md) to use the MediaPipe Android Solution
+APIs (currently in alpha) that are now available in
+[Google's Maven Repository](https://maven.google.com/web/index.html?#com.google.mediapipe).
+
+## Building Android example apps with Bazel
 
 ### Prerequisite
 
@@ -51,16 +53,6 @@ $YOUR_INTENDED_API_LEVEL` in android_ndk_repository() and/or
 android_sdk_repository() in the
 [`WORKSPACE`](https://github.com/google/mediapipe/blob/master/WORKSPACE) file.
 
-Please verify all the necessary packages are installed.
-
-*   Android SDK Platform API Level 28 or 29
-*   Android SDK Build-Tools 28 or 29
-*   Android SDK Platform-Tools 28 or 29
-*   Android SDK Tools 26.1.1
-*   Android NDK 19c or above
-
-### Option 1: Build with Bazel in Command Line
-
 Tip: You can run this
 [script](https://github.com/google/mediapipe/blob/master/build_android_examples.sh)
 to build (and install) all MediaPipe Android example apps.
@@ -84,108 +76,3 @@ to build (and install) all MediaPipe Android example apps.
     ```bash
     adb install bazel-bin/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/handtrackinggpu.apk
     ```
-
-### Option 2: Build with Bazel in Android Studio
-
-The MediaPipe project can be imported into Android Studio using the Bazel
-plugins. This allows the MediaPipe examples to be built and modified in Android
-Studio.
-
-To incorporate MediaPipe into an existing Android Studio project, see these
-[instructions](./android_archive_library.md) that use Android Archive (AAR) and
-Gradle.
-
-The steps below use Android Studio 3.5 to build and install a MediaPipe example
-app:
-
-1.  Install and launch Android Studio 3.5.
-
-2.  Select `Configure` -> `SDK Manager` -> `SDK Platforms`.
-
-    *   Verify that Android SDK Platform API Level 28 or 29 is installed.
-    *   Take note of the Android SDK Location, e.g.,
-        `/usr/local/home/Android/Sdk`.
-
-3.  Select `Configure` -> `SDK Manager` -> `SDK Tools`.
-
-    *   Verify that Android SDK Build-Tools 28 or 29 is installed.
-    *   Verify that Android SDK Platform-Tools 28 or 29 is installed.
-    *   Verify that Android SDK Tools 26.1.1 is installed.
-    *   Verify that Android NDK 19c or above is installed.
-    *   Take note of the Android NDK Location, e.g.,
-        `/usr/local/home/Android/Sdk/ndk-bundle` or
-        `/usr/local/home/Android/Sdk/ndk/20.0.5594570`.
-
-4.  Set environment variables `$ANDROID_HOME` and `$ANDROID_NDK_HOME` to point
-    to the installed SDK and NDK.
-
-    ```bash
-    export ANDROID_HOME=/usr/local/home/Android/Sdk
-
-    # If the NDK libraries are installed by a previous version of Android Studio, do
-    export ANDROID_NDK_HOME=/usr/local/home/Android/Sdk/ndk-bundle
-    # If the NDK libraries are installed by Android Studio 3.5, do
-    export ANDROID_NDK_HOME=/usr/local/home/Android/Sdk/ndk/<version number>
-    ```
-
-5.  Select `Configure` -> `Plugins` to install `Bazel`.
-
-6.  On Linux, select `File` -> `Settings` -> `Bazel settings`. On macos, select
-    `Android Studio` -> `Preferences` -> `Bazel settings`. Then, modify `Bazel
-    binary location` to be the same as the output of `$ which bazel`.
-
-7.  Select `Import Bazel Project`.
-
-    *   Select `Workspace`: `/path/to/mediapipe` and select `Next`.
-    *   Select `Generate from BUILD file`: `/path/to/mediapipe/BUILD` and select
-        `Next`.
-    *   Modify `Project View` to be the following and select `Finish`.
-
-    ```
-    directories:
-      # read project settings, e.g., .bazelrc
-      .
-      -mediapipe/objc
-      -mediapipe/examples/ios
-
-    targets:
-      //mediapipe/examples/android/...:all
-      //mediapipe/java/...:all
-
-    android_sdk_platform: android-29
-
-    sync_flags:
-      --host_crosstool_top=@bazel_tools//tools/cpp:toolchain
-    ```
-
-8.  Select `Bazel` -> `Sync` -> `Sync project with Build files`.
-
-    Note: Even after doing step 4, if you still see the error: `"no such package
-    '@androidsdk//': Either the path attribute of android_sdk_repository or the
-    ANDROID_HOME environment variable must be set."`, please modify the
-    [`WORKSPACE`](https://github.com/google/mediapipe/blob/master/WORKSPACE)
-    file to point to your SDK and NDK library locations, as below:
-
-    ```
-    android_sdk_repository(
-        name = "androidsdk",
-        path = "/path/to/android/sdk"
-    )
-
-    android_ndk_repository(
-        name = "androidndk",
-        path = "/path/to/android/ndk"
-    )
-    ```
-
-9.  Connect an Android device to the workstation.
-
-10. Select `Run...` -> `Edit Configurations...`.
-
-    *   Select `Templates` -> `Bazel Command`.
-    *   Enter Target Expression:
-        `//mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu:handtrackinggpu`
-    *   Enter Bazel command: `mobile-install`.
-    *   Enter Bazel flags: `-c opt --config=android_arm64`.
-    *   Press the `[+]` button to add the new configuration.
-    *   Select `Run` to run the example app on the connected Android device.

docs/getting_started/android_archive_library.md

@@ -3,7 +3,7 @@ layout: default
 title: MediaPipe Android Archive
 parent: MediaPipe on Android
 grand_parent: Getting Started
-nav_order: 2
+nav_order: 3
 ---
 
 # MediaPipe Android Archive

docs/getting_started/android_solutions.md

@@ -0,0 +1,79 @@
+---
+layout: default
+title: Android Solutions
+parent: MediaPipe on Android
+grand_parent: Getting Started
+nav_order: 2
+---
+
+# Android Solution APIs
+{: .no_toc }
+
+1. TOC
+{:toc}
+---
+
+Please follow instructions below to use the MediaPipe Solution APIs in Android
+Studio projects and build the Android example apps in the supported MediaPipe
+[solutions](../solutions/solutions.md).
+
+## Integrate MediaPipe Android Solutions in Android Studio
+
+MediaPipe Android Solution APIs (currently in alpha) are now available in
+[Google's Maven Repository](https://maven.google.com/web/index.html?#com.google.mediapipe).
+To incorporate MediaPipe Android Solutions into an Android Studio project, add
+the following into the project's Gradle dependencies:
+
+```
+dependencies {
+    // MediaPipe solution-core is the foundation of any MediaPipe solutions.
+    implementation 'com.google.mediapipe:solution-core:latest.release'
+    // Optional: MediaPipe Hands solution.
+    implementation 'com.google.mediapipe:hands:latest.release'
+    // Optional: MediaPipe FaceMesh solution.
+    implementation 'com.google.mediapipe:facemesh:latest.release'
+    // MediaPipe deps
+    implementation 'com.google.flogger:flogger:latest.release'
+    implementation 'com.google.flogger:flogger-system-backend:latest.release'
+    implementation 'com.google.guava:guava:27.0.1-android'
+    implementation 'com.google.protobuf:protobuf-java:3.11.4'
+    // CameraX core library
+    def camerax_version = "1.0.0-beta10"
+    implementation "androidx.camera:camera-core:$camerax_version"
+    implementation "androidx.camera:camera-camera2:$camerax_version"
+    implementation "androidx.camera:camera-lifecycle:$camerax_version"
+}
+```
+
+See the detailed solutions API usage examples for different use cases in the
+solution example apps'
+[source code](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions).
+If the prebuilt maven packages are not sufficient, building the MediaPipe
+Android archive library locally by following these
+[instructions](./android_archive_library.md).
+
+## Build solution example apps in Android Studio
+
+1.  Open Android Studio Arctic Fox on Linux, macOS, or Windows.
+
+2.  Import mediapipe/examples/android/solutions directory into Android Studio.
+
+    ![Screenshot](../images/import_mp_android_studio_project.png)
+
+3.  For Windows users, run `create_win_symlinks.bat` as administrator to create
+    res directory symlinks.
+
+    ![Screenshot](../images/run_create_win_symlinks.png)
+
+4.  Select "File" -> "Sync Project with Gradle Files" to sync project.
+
+5.  Run solution example app in Android Studio.
+
+    ![Screenshot](../images/run_android_solution_app.png)
+
+6.  (Optional) Run solutions on CPU.
+
+    MediaPipe solution example apps run the pipeline and the model inference on
+    GPU by default. If needed, for example to run the apps on Android Emulator,
+    set the `RUN_ON_GPU` boolean variable to `false` in the app's
+    MainActivity.java to run the pipeline and the model inference on CPU.

docs/getting_started/install.md

@@ -43,104 +43,189 @@ install --user six`.
 
 3.  Install OpenCV and FFmpeg.
 
-    Option 1. Use package manager tool to install the pre-compiled OpenCV
+    **Option 1**. Use package manager tool to install the pre-compiled OpenCV
-    libraries. FFmpeg will be installed via libopencv-video-dev.
+    libraries. FFmpeg will be installed via `libopencv-video-dev`.
 
-    Note: Debian 9 and Ubuntu 16.04 provide OpenCV 2.4.9. You may want to take
+    OS                   | OpenCV
-    option 2 or 3 to install OpenCV 3 or above.
+    -------------------- | ------
+    Debian 9 (stretch)   | 2.4
+    Debian 10 (buster)   | 3.2
+    Debian 11 (bullseye) | 4.5
+    Ubuntu 16.04 LTS     | 2.4
+    Ubuntu 18.04 LTS     | 3.2
+    Ubuntu 20.04 LTS     | 4.2
+    Ubuntu 20.04 LTS     | 4.2
+    Ubuntu 21.04         | 4.5
 
     ```bash
-    $ sudo apt-get install libopencv-core-dev libopencv-highgui-dev \
+    $ sudo apt-get install -y \
-                           libopencv-calib3d-dev libopencv-features2d-dev \
+        libopencv-core-dev \
-                           libopencv-imgproc-dev libopencv-video-dev
+        libopencv-highgui-dev \
+        libopencv-calib3d-dev \
+        libopencv-features2d-dev \
+        libopencv-imgproc-dev \
+        libopencv-video-dev
     ```
 
-    Debian 9 and Ubuntu 18.04 install the packages in
+    MediaPipe's [`opencv_linux.BUILD`] and [`WORKSPACE`] are already configured
-    `/usr/lib/x86_64-linux-gnu`. MediaPipe's [`opencv_linux.BUILD`] and
+    for OpenCV 2/3 and should work correctly on any architecture:
-    [`ffmpeg_linux.BUILD`] are configured for this library path. Ubuntu 20.04
-    may install the OpenCV and FFmpeg packages in `/usr/local`, Please follow
-    the option 3 below to modify the [`WORKSPACE`], [`opencv_linux.BUILD`] and
-    [`ffmpeg_linux.BUILD`] files accordingly.
-
-    Moreover, for Nvidia Jetson and Raspberry Pi devices with ARM Ubuntu, the
-    library path needs to be modified like the following:
 
     ```bash
-    sed -i "s/x86_64-linux-gnu/aarch64-linux-gnu/g" third_party/opencv_linux.BUILD
+    # WORKSPACE
+    new_local_repository(
+      name = "linux_opencv",
+      build_file = "@//third_party:opencv_linux.BUILD",
+      path = "/usr",
+    )
+
+    # opencv_linux.BUILD for OpenCV 2/3 installed from Debian package
+    cc_library(
+      name = "opencv",
+      linkopts = [
+        "-l:libopencv_core.so",
+        "-l:libopencv_calib3d.so",
+        "-l:libopencv_features2d.so",
+        "-l:libopencv_highgui.so",
+        "-l:libopencv_imgcodecs.so",
+        "-l:libopencv_imgproc.so",
+        "-l:libopencv_video.so",
+        "-l:libopencv_videoio.so",
+      ],
+    )
     ```
 
-    Option 2. Run [`setup_opencv.sh`] to automatically build OpenCV from source
+    For OpenCV 4 you need to modify [`opencv_linux.BUILD`] taking into account
-    and modify MediaPipe's OpenCV config.
+    current architecture:
 
-    Option 3. Follow OpenCV's
+    ```bash
+    # WORKSPACE
+    new_local_repository(
+      name = "linux_opencv",
+      build_file = "@//third_party:opencv_linux.BUILD",
+      path = "/usr",
+    )
+
+    # opencv_linux.BUILD for OpenCV 4 installed from Debian package
+    cc_library(
+      name = "opencv",
+      hdrs = glob([
+        # Uncomment according to your multiarch value (gcc -print-multiarch):
+        #  "include/aarch64-linux-gnu/opencv4/opencv2/cvconfig.h",
+        #  "include/arm-linux-gnueabihf/opencv4/opencv2/cvconfig.h",
+        #  "include/x86_64-linux-gnu/opencv4/opencv2/cvconfig.h",
+        "include/opencv4/opencv2/**/*.h*",
+      ]),
+      includes = [
+        # Uncomment according to your multiarch value (gcc -print-multiarch):
+        #  "include/aarch64-linux-gnu/opencv4/",
+        #  "include/arm-linux-gnueabihf/opencv4/",
+        #  "include/x86_64-linux-gnu/opencv4/",
+        "include/opencv4/",
+      ],
+      linkopts = [
+        "-l:libopencv_core.so",
+        "-l:libopencv_calib3d.so",
+        "-l:libopencv_features2d.so",
+        "-l:libopencv_highgui.so",
+        "-l:libopencv_imgcodecs.so",
+        "-l:libopencv_imgproc.so",
+        "-l:libopencv_video.so",
+        "-l:libopencv_videoio.so",
+      ],
+    )
+    ```
+
+    **Option 2**. Run [`setup_opencv.sh`] to automatically build OpenCV from
+    source and modify MediaPipe's OpenCV config. This option will do all steps
+    defined in Option 3 automatically.
+
+    **Option 3**. Follow OpenCV's
     [documentation](https://docs.opencv.org/3.4.6/d7/d9f/tutorial_linux_install.html)
     to manually build OpenCV from source code.
 
-    Note: You may need to modify [`WORKSPACE`], [`opencv_linux.BUILD`] and
+    You may need to modify [`WORKSPACE`] and [`opencv_linux.BUILD`] to point
-    [`ffmpeg_linux.BUILD`] to point MediaPipe to your own OpenCV and FFmpeg
+    MediaPipe to your own OpenCV libraries. Assume OpenCV would be installed to
-    libraries. For example if OpenCV and FFmpeg are both manually installed in
+    `/usr/local/` which is recommended by default.
-    "/usr/local/", you will need to update: (1) the "linux_opencv" and
+
-    "linux_ffmpeg" new_local_repository rules in [`WORKSPACE`], (2) the "opencv"
+    OpenCV 2/3 setup:
-    cc_library rule in [`opencv_linux.BUILD`], and (3) the "libffmpeg"
-    cc_library rule in [`ffmpeg_linux.BUILD`]. These 3 changes are shown below:
 
     ```bash
+    # WORKSPACE
     new_local_repository(
       name = "linux_opencv",
       build_file = "@//third_party:opencv_linux.BUILD",
       path = "/usr/local",
     )
 
+    # opencv_linux.BUILD for OpenCV 2/3 installed to /usr/local
+    cc_library(
+      name = "opencv",
+      linkopts = [
+        "-L/usr/local/lib",
+        "-l:libopencv_core.so",
+        "-l:libopencv_calib3d.so",
+        "-l:libopencv_features2d.so",
+        "-l:libopencv_highgui.so",
+        "-l:libopencv_imgcodecs.so",
+        "-l:libopencv_imgproc.so",
+        "-l:libopencv_video.so",
+        "-l:libopencv_videoio.so",
+      ],
+    )
+    ```
+
+    OpenCV 4 setup:
+
+    ```bash
+    # WORKSPACE
     new_local_repository(
-        name = "linux_ffmpeg",
+      name = "linux_opencv",
-        build_file = "@//third_party:ffmpeg_linux.BUILD",
+      build_file = "@//third_party:opencv_linux.BUILD",
       path = "/usr/local",
     )
 
+    # opencv_linux.BUILD for OpenCV 4 installed to /usr/local
     cc_library(
       name = "opencv",
-        srcs = glob(
-            [
-                "lib/libopencv_core.so",
-                "lib/libopencv_highgui.so",
-                "lib/libopencv_imgcodecs.so",
-                "lib/libopencv_imgproc.so",
-                "lib/libopencv_video.so",
-                "lib/libopencv_videoio.so",
-            ],
-        ),
       hdrs = glob([
-            # For OpenCV 3.x
+        "include/opencv4/opencv2/**/*.h*",
-            "include/opencv2/**/*.h*",
-            # For OpenCV 4.x
-            # "include/opencv4/opencv2/**/*.h*",
       ]),
       includes = [
-            # For OpenCV 3.x
+        "include/opencv4/",
-            "include/",
-            # For OpenCV 4.x
-            # "include/opencv4/",
       ],
-        linkstatic = 1,
+      linkopts = [
-        visibility = ["//visibility:public"],
+        "-L/usr/local/lib",
+        "-l:libopencv_core.so",
+        "-l:libopencv_calib3d.so",
+        "-l:libopencv_features2d.so",
+        "-l:libopencv_highgui.so",
+        "-l:libopencv_imgcodecs.so",
+        "-l:libopencv_imgproc.so",
+        "-l:libopencv_video.so",
+        "-l:libopencv_videoio.so",
+      ],
+    )
+    ```
+
+    Current FFmpeg setup is defined in [`ffmpeg_linux.BUILD`] and should work
+    for any architecture:
+
+    ```bash
+    # WORKSPACE
+    new_local_repository(
+      name = "linux_ffmpeg",
+      build_file = "@//third_party:ffmpeg_linux.BUILD",
+      path = "/usr"
     )
 
+    # ffmpeg_linux.BUILD for FFmpeg installed from Debian package
     cc_library(
       name = "libffmpeg",
-        srcs = glob(
-            [
-                "lib/libav*.so",
-            ],
-        ),
-        hdrs = glob(["include/libav*/*.h"]),
-        includes = ["include"],
       linkopts = [
-            "-lavcodec",
+        "-l:libavcodec.so",
-            "-lavformat",
+        "-l:libavformat.so",
-            "-lavutil",
+        "-l:libavutil.so",
       ],
-        linkstatic = 1,
-        visibility = ["//visibility:public"],
     )
     ```
 

docs/getting_started/javascript.md

@@ -29,6 +29,16 @@ Solution                    | NPM Package                             | Example
 Click on a solution link above for more information, including API and code
 snippets.
 
+### Supported plaforms:
+
+| Browser | Platform                | Notes                                  |
+| ------- | ----------------------- | -------------------------------------- |
+| Chrome  | Android / Windows / Mac | Pixel 4 and older unsupported. Fuschia |
+|         |                         | unsupported.                           |
+| Chrome  | iOS                     | Camera unavailable in Chrome on iOS.   |
+| Safari  | iPad/iPhone/Mac         | iOS and Safari on iPad / iPhone /      |
+|         |                         | MacBook                                |
+
 The quickest way to get acclimated is to look at the examples above. Each demo
 has a link to a [CodePen][codepen] so that you can edit the code and try it
 yourself. We have included a number of utility packages to help you get started:

docs/solutions/face_mesh.md

@@ -278,6 +278,7 @@ Supported configuration options:
 import cv2
 import mediapipe as mp
 mp_drawing = mp.solutions.drawing_utils
+mp_drawing_styles = mp.solutions.drawing_styles
 mp_face_mesh = mp.solutions.face_mesh
 
 # For static images:
@@ -301,9 +302,17 @@ with mp_face_mesh.FaceMesh(
       mp_drawing.draw_landmarks(
           image=annotated_image,
           landmark_list=face_landmarks,
-          connections=mp_face_mesh.FACE_CONNECTIONS,
+          connections=mp_face_mesh.FACEMESH_TESSELATION,
-          landmark_drawing_spec=drawing_spec,
+          landmark_drawing_spec=None,
-          connection_drawing_spec=drawing_spec)
+          connection_drawing_spec=mp_drawing_styles
+          .get_default_face_mesh_tesselation_style())
+      mp_drawing.draw_landmarks(
+          image=annotated_image,
+          landmark_list=face_landmarks,
+          connections=mp_face_mesh.FACEMESH_CONTOURS,
+          landmark_drawing_spec=None,
+          connection_drawing_spec=mp_drawing_styles
+          .get_default_face_mesh_contours_style())
     cv2.imwrite('/tmp/annotated_image' + str(idx) + '.png', annotated_image)
 
 # For webcam input:
@@ -335,9 +344,17 @@ with mp_face_mesh.FaceMesh(
         mp_drawing.draw_landmarks(
             image=image,
             landmark_list=face_landmarks,
-            connections=mp_face_mesh.FACE_CONNECTIONS,
+            connections=mp_face_mesh.FACEMESH_TESSELATION,
-            landmark_drawing_spec=drawing_spec,
+            landmark_drawing_spec=None,
-            connection_drawing_spec=drawing_spec)
+            connection_drawing_spec=mp_drawing_styles
+            .get_default_face_mesh_tesselation_style())
+        mp_drawing.draw_landmarks(
+            image=image,
+            landmark_list=face_landmarks,
+            connections=mp_face_mesh.FACEMESH_CONTOURS,
+            landmark_drawing_spec=None,
+            connection_drawing_spec=mp_drawing_styles
+            .get_default_face_mesh_contours_style())
     cv2.imshow('MediaPipe FaceMesh', image)
     if cv2.waitKey(5) & 0xFF == 27:
       break
@@ -423,6 +440,200 @@ camera.start();
 </script>
 ```
 
+### Android Solution API
+
+Please first follow general
+[instructions](../getting_started/android_solutions.md#integrate-mediapipe-android-solutions-api)
+to add MediaPipe Gradle dependencies, then try the FaceMash solution API in the
+companion
+[example Android Studio project](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions/facemesh)
+following
+[these instructions](../getting_started/android_solutions.md#build-solution-example-apps-in-android-studio)
+and learn more in the usage example below.
+
+Supported configuration options:
+
+*   [staticImageMode](#static_image_mode)
+*   [maxNumFaces](#max_num_faces)
+*   runOnGpu: Run the pipeline and the model inference on GPU or CPU.
+
+#### Camera Input
+
+```java
+// For camera input and result rendering with OpenGL.
+FaceMeshOptions faceMeshOptions =
+    FaceMeshOptions.builder()
+        .setMode(FaceMeshOptions.STREAMING_MODE)  // API soon to become
+        .setMaxNumFaces(1)                        // setStaticImageMode(false)
+        .setRunOnGpu(true).build();
+FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
+facemesh.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe FaceMesh error:" + message));
+
+// Initializes a new CameraInput instance and connects it to MediaPipe FaceMesh.
+CameraInput cameraInput = new CameraInput(this);
+cameraInput.setNewFrameListener(
+    textureFrame -> facemesh.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<FaceMeshResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<FaceMeshResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, facemesh.getGlContext(), facemesh.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new FaceMeshResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+
+facemesh.setResultListener(
+    faceMeshResult -> {
+      NormalizedLandmark noseLandmark =
+          result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe FaceMesh nose normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              noseLandmark.getX(), noseLandmark.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(faceMeshResult);
+      glSurfaceView.requestRender();
+    });
+
+// The runnable to start camera after the GLSurfaceView is attached.
+glSurfaceView.post(
+    () ->
+        cameraInput.start(
+            this,
+            facemesh.getGlContext(),
+            CameraInput.CameraFacing.FRONT,
+            glSurfaceView.getWidth(),
+            glSurfaceView.getHeight()));
+```
+
+#### Image Input
+
+```java
+// For reading images from gallery and drawing the output in an ImageView.
+FaceMeshOptions faceMeshOptions =
+    FaceMeshOptions.builder()
+        .setMode(FaceMeshOptions.STATIC_IMAGE_MODE)  // API soon to become
+        .setMaxNumFaces(1)                           // setStaticImageMode(true)
+        .setRunOnGpu(true).build();
+FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
+
+// Connects MediaPipe FaceMesh to the user-defined ImageView instance that allows
+// users to have the custom drawing of the output landmarks on it.
+// See mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultImageView.java
+// as an example.
+FaceMeshResultImageView imageView = new FaceMeshResultImageView(this);
+facemesh.setResultListener(
+    faceMeshResult -> {
+      int width = faceMeshResult.inputBitmap().getWidth();
+      int height = faceMeshResult.inputBitmap().getHeight();
+      NormalizedLandmark noseLandmark =
+          result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe FaceMesh nose coordinates (pixel values): x=%f, y=%f",
+              noseLandmark.getX() * width, noseLandmark.getY() * height));
+      // Request canvas drawing.
+      imageView.setFaceMeshResult(faceMeshResult);
+      runOnUiThread(() -> imageView.update());
+    });
+facemesh.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe FaceMesh error:" + message));
+
+// ActivityResultLauncher to get an image from the gallery as Bitmap.
+ActivityResultLauncher<Intent> imageGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null && result.getResultCode() == RESULT_OK) {
+            Bitmap bitmap = null;
+            try {
+              bitmap =
+                  MediaStore.Images.Media.getBitmap(
+                      this.getContentResolver(), resultIntent.getData());
+            } catch (IOException e) {
+              Log.e(TAG, "Bitmap reading error:" + e);
+            }
+            if (bitmap != null) {
+              facemesh.send(bitmap);
+            }
+          }
+        });
+Intent gallery = new Intent(
+    Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
+imageGetter.launch(gallery);
+```
+
+#### Video Input
+
+```java
+// For video input and result rendering with OpenGL.
+FaceMeshOptions faceMeshOptions =
+    FaceMeshOptions.builder()
+        .setMode(FaceMeshOptions.STREAMING_MODE)  // API soon to become
+        .setMaxNumFaces(1)                        // setStaticImageMode(false)
+        .setRunOnGpu(true).build();
+FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
+facemesh.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe FaceMesh error:" + message));
+
+// Initializes a new VideoInput instance and connects it to MediaPipe FaceMesh.
+VideoInput videoInput = new VideoInput(this);
+videoInput.setNewFrameListener(
+    textureFrame -> facemesh.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<FaceMeshResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<FaceMeshResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, facemesh.getGlContext(), facemesh.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new FaceMeshResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+
+facemesh.setResultListener(
+    faceMeshResult -> {
+      NormalizedLandmark noseLandmark =
+          result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe FaceMesh nose normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              noseLandmark.getX(), noseLandmark.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(faceMeshResult);
+      glSurfaceView.requestRender();
+    });
+
+ActivityResultLauncher<Intent> videoGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null) {
+            if (result.getResultCode() == RESULT_OK) {
+              glSurfaceView.post(
+                  () ->
+                      videoInput.start(
+                          this,
+                          resultIntent.getData(),
+                          facemesh.getGlContext(),
+                          glSurfaceView.getWidth(),
+                          glSurfaceView.getHeight()));
+            }
+          }
+        });
+Intent gallery =
+    new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+videoGetter.launch(gallery);
+```
+
 ## Example Apps
 
 Please first see general instructions for

docs/solutions/hands.md

@@ -219,8 +219,8 @@ Supported configuration options:
 import cv2
 import mediapipe as mp
 mp_drawing = mp.solutions.drawing_utils
+mp_drawing_styles = mp.solutions.drawing_styles
 mp_hands = mp.solutions.hands
-drawing_styles = mp.solutions.drawing_styles
 
 # For static images:
 IMAGE_FILES = []
@@ -249,9 +249,11 @@ with mp_hands.Hands(
           f'{hand_landmarks.landmark[mp_hands.HandLandmark.INDEX_FINGER_TIP].y * image_height})'
       )
       mp_drawing.draw_landmarks(
-          annotated_image, hand_landmarks, mp_hands.HAND_CONNECTIONS,
+          annotated_image,
-          drawing_styles.get_default_hand_landmark_style(),
+          hand_landmarks,
-          drawing_styles.get_default_hand_connection_style())
+          mp_hands.HAND_CONNECTIONS,
+          mp_drawing_styles.get_default_hand_landmarks_style(),
+          mp_drawing_styles.get_default_hand_connections_style())
     cv2.imwrite(
         '/tmp/annotated_image' + str(idx) + '.png', cv2.flip(annotated_image, 1))
 
@@ -281,9 +283,11 @@ with mp_hands.Hands(
     if results.multi_hand_landmarks:
       for hand_landmarks in results.multi_hand_landmarks:
         mp_drawing.draw_landmarks(
-            image, hand_landmarks, mp_hands.HAND_CONNECTIONS,
+            image,
-            drawing_styles.get_default_hand_landmark_style(),
+            hand_landmarks,
-            drawing_styles.get_default_hand_connection_style())
+            mp_hands.HAND_CONNECTIONS,
+            mp_drawing_styles.get_default_hand_landmarks_style(),
+            mp_drawing_styles.get_default_hand_connections_style())
     cv2.imshow('MediaPipe Hands', image)
     if cv2.waitKey(5) & 0xFF == 27:
       break
@@ -364,6 +368,200 @@ camera.start();
 </script>
 ```
 
+### Android Solution API
+
+Please first follow general
+[instructions](../getting_started/android_solutions.md#integrate-mediapipe-android-solutions-api)
+to add MediaPipe Gradle dependencies, then try the Hands solution API in the
+companion
+[example Android Studio project](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions/hands)
+following
+[these instructions](../getting_started/android_solutions.md#build-solution-example-apps-in-android-studio)
+and learn more in usage example below.
+
+Supported configuration options:
+
+*   [staticImageMode](#static_image_mode)
+*   [maxNumHands](#max_num_hands)
+*   runOnGpu: Run the pipeline and the model inference on GPU or CPU.
+
+#### Camera Input
+
+```java
+// For camera input and result rendering with OpenGL.
+HandsOptions handsOptions =
+    HandsOptions.builder()
+        .setMode(HandsOptions.STREAMING_MODE)  // API soon to become
+        .setMaxNumHands(1)                     // setStaticImageMode(false)
+        .setRunOnGpu(true).build();
+Hands hands = new Hands(this, handsOptions);
+hands.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
+
+// Initializes a new CameraInput instance and connects it to MediaPipe Hands.
+CameraInput cameraInput = new CameraInput(this);
+cameraInput.setNewFrameListener(
+    textureFrame -> hands.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<HandsResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<HandsResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, hands.getGlContext(), hands.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new HandsResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+
+hands.setResultListener(
+    handsResult -> {
+      NormalizedLandmark wristLandmark = Hands.getHandLandmark(
+          handsResult, 0, HandLandmark.WRIST);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Hand wrist normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              wristLandmark.getX(), wristLandmark.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(handsResult);
+      glSurfaceView.requestRender();
+    });
+
+// The runnable to start camera after the GLSurfaceView is attached.
+glSurfaceView.post(
+    () ->
+        cameraInput.start(
+            this,
+            hands.getGlContext(),
+            CameraInput.CameraFacing.FRONT,
+            glSurfaceView.getWidth(),
+            glSurfaceView.getHeight()));
+```
+
+#### Image Input
+
+```java
+// For reading images from gallery and drawing the output in an ImageView.
+HandsOptions handsOptions =
+    HandsOptions.builder()
+        .setMode(HandsOptions.STATIC_IMAGE_MODE)  // API soon to become
+        .setMaxNumHands(1)                        // setStaticImageMode(true)
+        .setRunOnGpu(true).build();
+Hands hands = new Hands(this, handsOptions);
+
+// Connects MediaPipe Hands to the user-defined ImageView instance that allows
+// users to have the custom drawing of the output landmarks on it.
+// See mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultImageView.java
+// as an example.
+HandsResultImageView imageView = new HandsResultImageView(this);
+hands.setResultListener(
+    handsResult -> {
+      int width = handsResult.inputBitmap().getWidth();
+      int height = handsResult.inputBitmap().getHeight();
+      NormalizedLandmark wristLandmark = Hands.getHandLandmark(
+          handsResult, 0, HandLandmark.WRIST);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Hand wrist coordinates (pixel values): x=%f, y=%f",
+              wristLandmark.getX() * width, wristLandmark.getY() * height));
+      // Request canvas drawing.
+      imageView.setHandsResult(handsResult);
+      runOnUiThread(() -> imageView.update());
+    });
+hands.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
+
+// ActivityResultLauncher to get an image from the gallery as Bitmap.
+ActivityResultLauncher<Intent> imageGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null && result.getResultCode() == RESULT_OK) {
+            Bitmap bitmap = null;
+            try {
+              bitmap =
+                  MediaStore.Images.Media.getBitmap(
+                      this.getContentResolver(), resultIntent.getData());
+            } catch (IOException e) {
+              Log.e(TAG, "Bitmap reading error:" + e);
+            }
+            if (bitmap != null) {
+              hands.send(bitmap);
+            }
+          }
+        });
+Intent gallery = new Intent(
+    Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
+imageGetter.launch(gallery);
+```
+
+#### Video Input
+
+```java
+// For video input and result rendering with OpenGL.
+HandsOptions handsOptions =
+    HandsOptions.builder()
+        .setMode(HandsOptions.STREAMING_MODE)  // API soon to become
+        .setMaxNumHands(1)                     // setStaticImageMode(false)
+        .setRunOnGpu(true).build();
+Hands hands = new Hands(this, handsOptions);
+hands.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
+
+// Initializes a new VideoInput instance and connects it to MediaPipe Hands.
+VideoInput videoInput = new VideoInput(this);
+videoInput.setNewFrameListener(
+    textureFrame -> hands.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<HandsResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<HandsResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, hands.getGlContext(), hands.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new HandsResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+
+hands.setResultListener(
+    handsResult -> {
+      NormalizedLandmark wristLandmark = Hands.getHandLandmark(
+          handsResult, 0, HandLandmark.WRIST);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Hand wrist normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              wristLandmark.getX(), wristLandmark.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(handsResult);
+      glSurfaceView.requestRender();
+    });
+
+ActivityResultLauncher<Intent> videoGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null) {
+            if (result.getResultCode() == RESULT_OK) {
+              glSurfaceView.post(
+                  () ->
+                      videoInput.start(
+                          this,
+                          resultIntent.getData(),
+                          hands.getGlContext(),
+                          glSurfaceView.getWidth(),
+                          glSurfaceView.getHeight()));
+            }
+          }
+        });
+Intent gallery =
+    new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+videoGetter.launch(gallery);
+```
+
 ## Example Apps
 
 Please first see general instructions for

docs/solutions/holistic.md

@@ -225,6 +225,7 @@ Supported configuration options:
 import cv2
 import mediapipe as mp
 mp_drawing = mp.solutions.drawing_utils
+mp_drawing_styles = mp.solutions.drawing_styles
 mp_holistic = mp.solutions.holistic
 
 # For static images:
@@ -247,13 +248,18 @@ with mp_holistic.Holistic(
     # Draw pose, left and right hands, and face landmarks on the image.
     annotated_image = image.copy()
     mp_drawing.draw_landmarks(
-        annotated_image, results.face_landmarks, mp_holistic.FACE_CONNECTIONS)
+        annotated_image,
+        results.face_landmarks,
+        mp_holistic.FACEMESH_TESSELATION,
+        landmark_drawing_spec=None,
+        connection_drawing_spec=mp_drawing_styles
+        .get_default_face_mesh_tesselation_style())
     mp_drawing.draw_landmarks(
-        annotated_image, results.left_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
+        annotated_image,
-    mp_drawing.draw_landmarks(
+        results.pose_landmarks,
-        annotated_image, results.right_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
+        mp_holistic.POSE_CONNECTIONS,
-    mp_drawing.draw_landmarks(
+        landmark_drawing_spec=mp_drawing_styles.
-        annotated_image, results.pose_landmarks, mp_holistic.POSE_CONNECTIONS)
+        get_default_pose_landmarks_style())
     cv2.imwrite('/tmp/annotated_image' + str(idx) + '.png', annotated_image)
     # Plot pose world landmarks.
     mp_drawing.plot_landmarks(
@@ -283,13 +289,18 @@ with mp_holistic.Holistic(
     image.flags.writeable = True
     image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
     mp_drawing.draw_landmarks(
-        image, results.face_landmarks, mp_holistic.FACE_CONNECTIONS)
+        image,
+        results.face_landmarks,
+        mp_holistic.FACEMESH_CONTOURS,
+        landmark_drawing_spec=None,
+        connection_drawing_spec=mp_drawing_styles
+        .get_default_face_mesh_contours_style())
     mp_drawing.draw_landmarks(
-        image, results.left_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
+        image,
-    mp_drawing.draw_landmarks(
+        results.pose_landmarks,
-        image, results.right_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
+        mp_holistic.POSE_CONNECTIONS,
-    mp_drawing.draw_landmarks(
+        landmark_drawing_spec=mp_drawing_styles
-        image, results.pose_landmarks, mp_holistic.POSE_CONNECTIONS)
+        .get_default_pose_landmarks_style())
     cv2.imshow('MediaPipe Holistic', image)
     if cv2.waitKey(5) & 0xFF == 27:
       break

docs/solutions/pose.md

@@ -30,7 +30,8 @@ overlay of digital content and information on top of the physical world in
 augmented reality.
 
 MediaPipe Pose is a ML solution for high-fidelity body pose tracking, inferring
-33 3D landmarks on the whole body from RGB video frames utilizing our
+33 3D landmarks and background segmentation mask on the whole body from RGB
+video frames utilizing our
 [BlazePose](https://ai.googleblog.com/2020/08/on-device-real-time-body-pose-tracking.html)
 research that also powers the
 [ML Kit Pose Detection API](https://developers.google.com/ml-kit/vision/pose-detection).
@@ -49,11 +50,11 @@ The solution utilizes a two-step detector-tracker ML pipeline, proven to be
 effective in our [MediaPipe Hands](./hands.md) and
 [MediaPipe Face Mesh](./face_mesh.md) solutions. Using a detector, the pipeline
 first locates the person/pose region-of-interest (ROI) within the frame. The
-tracker subsequently predicts the pose landmarks within the ROI using the
+tracker subsequently predicts the pose landmarks and segmentation mask within
-ROI-cropped frame as input. Note that for video use cases the detector is
+the ROI using the ROI-cropped frame as input. Note that for video use cases the
-invoked only as needed, i.e., for the very first frame and when the tracker
+detector is invoked only as needed, i.e., for the very first frame and when the
-could no longer identify body pose presence in the previous frame. For other
+tracker could no longer identify body pose presence in the previous frame. For
-frames the pipeline simply derives the ROI from the previous frame’s pose
+other frames the pipeline simply derives the ROI from the previous frame’s pose
 landmarks.
 
 The pipeline is implemented as a MediaPipe
@@ -129,16 +130,19 @@ hip midpoints.
 The landmark model in MediaPipe Pose predicts the location of 33 pose landmarks
 (see figure below).
 
-Please find more detail in the
-[BlazePose Google AI Blog](https://ai.googleblog.com/2020/08/on-device-real-time-body-pose-tracking.html),
-this [paper](https://arxiv.org/abs/2006.10204) and
-[the model card](./models.md#pose), and the attributes in each landmark
-[below](#pose_landmarks).
-
 ![pose_tracking_full_body_landmarks.png](../images/mobile/pose_tracking_full_body_landmarks.png) |
 :----------------------------------------------------------------------------------------------: |
 *Fig 4. 33 pose landmarks.*                                                                      |
 
+Optionally, MediaPipe Pose can predicts a full-body
+[segmentation mask](#segmentation_mask) represented as a two-class segmentation
+(human or background).
+
+Please find more detail in the
+[BlazePose Google AI Blog](https://ai.googleblog.com/2020/08/on-device-real-time-body-pose-tracking.html),
+this [paper](https://arxiv.org/abs/2006.10204),
+[the model card](./models.md#pose) and the [Output](#Output) section below.
+
 ## Solution APIs
 
 ### Cross-platform Configuration Options
@@ -167,6 +171,18 @@ If set to `true`, the solution filters pose landmarks across different input
 images to reduce jitter, but ignored if [static_image_mode](#static_image_mode)
 is also set to `true`. Default to `true`.
 
+#### enable_segmentation
+
+If set to `true`, in addition to the pose landmarks the solution also generates
+the segmentation mask. Default to `false`.
+
+#### smooth_segmentation
+
+If set to `true`, the solution filters segmentation masks across different input
+images to reduce jitter. Ignored if [enable_segmentation](#enable_segmentation)
+is `false` or [static_image_mode](#static_image_mode) is `true`. Default to
+`true`.
+
 #### min_detection_confidence
 
 Minimum confidence value (`[0.0, 1.0]`) from the person-detection model for the
@@ -211,6 +227,19 @@ the following:
 *   `visibility`: Identical to that defined in the corresponding
     [pose_landmarks](#pose_landmarks).
 
+#### segmentation_mask
+
+The output segmentation mask, predicted only when
+[enable_segmentation](#enable_segmentation) is set to `true`. The mask has the
+same width and height as the input image, and contains values in `[0.0, 1.0]`
+where `1.0` and `0.0` indicate high certainty of a "human" and "background"
+pixel respectively. Please refer to the platform-specific usage examples below
+for usage details.
+
+*Fig 6. Example of MediaPipe Pose segmentation mask.* |
+:-----------------------------------------------------------: |
+<video autoplay muted loop preload style="height: auto; width: 480px"><source src="../images/mobile/pose_segmentation.mp4" type="video/mp4"></video> |
+
 ### Python Solution API
 
 Please first follow general [instructions](../getting_started/python.md) to
@@ -222,6 +251,8 @@ Supported configuration options:
 *   [static_image_mode](#static_image_mode)
 *   [model_complexity](#model_complexity)
 *   [smooth_landmarks](#smooth_landmarks)
+*   [enable_segmentation](#enable_segmentation)
+*   [smooth_segmentation](#smooth_segmentation)
 *   [min_detection_confidence](#min_detection_confidence)
 *   [min_tracking_confidence](#min_tracking_confidence)
 
@@ -229,13 +260,16 @@ Supported configuration options:
 import cv2
 import mediapipe as mp
 mp_drawing = mp.solutions.drawing_utils
+mp_drawing_styles = mp.solutions.drawing_styles
 mp_pose = mp.solutions.pose
 
 # For static images:
 IMAGE_FILES = []
+BG_COLOR = (192, 192, 192) # gray
 with mp_pose.Pose(
     static_image_mode=True,
     model_complexity=2,
+    enable_segmentation=True,
     min_detection_confidence=0.5) as pose:
   for idx, file in enumerate(IMAGE_FILES):
     image = cv2.imread(file)
@@ -250,10 +284,21 @@ with mp_pose.Pose(
         f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].x * image_width}, '
         f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].y * image_height})'
     )
-    # Draw pose landmarks on the image.
+
     annotated_image = image.copy()
+    # Draw segmentation on the image.
+    # To improve segmentation around boundaries, consider applying a joint
+    # bilateral filter to "results.segmentation_mask" with "image".
+    condition = np.stack((results.segmentation_mask,) * 3, axis=-1) > 0.1
+    bg_image = np.zeros(image.shape, dtype=np.uint8)
+    bg_image[:] = BG_COLOR
+    annotated_image = np.where(condition, annotated_image, bg_image)
+    # Draw pose landmarks on the image.
     mp_drawing.draw_landmarks(
-        annotated_image, results.pose_landmarks, mp_pose.POSE_CONNECTIONS)
+        annotated_image,
+        results.pose_landmarks,
+        mp_pose.POSE_CONNECTIONS,
+        landmark_drawing_spec=mp_drawing_styles.get_default_pose_landmarks_style())
     cv2.imwrite('/tmp/annotated_image' + str(idx) + '.png', annotated_image)
     # Plot pose world landmarks.
     mp_drawing.plot_landmarks(
@@ -283,7 +328,10 @@ with mp_pose.Pose(
     image.flags.writeable = True
     image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
     mp_drawing.draw_landmarks(
-        image, results.pose_landmarks, mp_pose.POSE_CONNECTIONS)
+        image,
+        results.pose_landmarks,
+        mp_pose.POSE_CONNECTIONS,
+        landmark_drawing_spec=mp_drawing_styles.get_default_pose_landmarks_style())
     cv2.imshow('MediaPipe Pose', image)
     if cv2.waitKey(5) & 0xFF == 27:
       break
@@ -300,6 +348,8 @@ Supported configuration options:
 
 *   [modelComplexity](#model_complexity)
 *   [smoothLandmarks](#smooth_landmarks)
+*   [enableSegmentation](#enable_segmentation)
+*   [smoothSegmentation](#smooth_segmentation)
 *   [minDetectionConfidence](#min_detection_confidence)
 *   [minTrackingConfidence](#min_tracking_confidence)
 
@@ -340,8 +390,20 @@ function onResults(results) {
 
   canvasCtx.save();
   canvasCtx.clearRect(0, 0, canvasElement.width, canvasElement.height);
+  canvasCtx.drawImage(results.segmentationMask, 0, 0,
+                      canvasElement.width, canvasElement.height);
+
+  // Only overwrite existing pixels.
+  canvasCtx.globalCompositeOperation = 'source-in';
+  canvasCtx.fillStyle = '#00FF00';
+  canvasCtx.fillRect(0, 0, canvasElement.width, canvasElement.height);
+
+  // Only overwrite missing pixels.
+  canvasCtx.globalCompositeOperation = 'destination-atop';
   canvasCtx.drawImage(
       results.image, 0, 0, canvasElement.width, canvasElement.height);
+
+  canvasCtx.globalCompositeOperation = 'source-over';
   drawConnectors(canvasCtx, results.poseLandmarks, POSE_CONNECTIONS,
                  {color: '#00FF00', lineWidth: 4});
   drawLandmarks(canvasCtx, results.poseLandmarks,
@@ -357,6 +419,8 @@ const pose = new Pose({locateFile: (file) => {
 pose.setOptions({
   modelComplexity: 1,
   smoothLandmarks: true,
+  enableSegmentation: true,
+  smoothSegmentation: true,
   minDetectionConfidence: 0.5,
   minTrackingConfidence: 0.5
 });

mediapipe/calculators/core/gate_calculator.cc

@@ -64,8 +64,9 @@ std::string ToString(GateState state) {
 // ALLOW or DISALLOW can also be specified as an input side packet. The rules
 // for evaluation remain the same as above.
 //
-// ALLOW/DISALLOW inputs must be specified either using input stream or
+// ALLOW/DISALLOW inputs must be specified either using input stream or via
-// via input side packet but not both.
+// input side packet but not both. If neither is specified, the behavior is then
+// determined by the "allow" field in the calculator options.
 //
 // Intended to be used with the default input stream handler, which synchronizes
 // all data input streams with the ALLOW/DISALLOW control input stream.
@@ -92,20 +93,22 @@ class GateCalculator : public CalculatorBase {
                                  cc->InputSidePackets().HasTag(kDisallowTag);
     bool input_via_stream =
         cc->Inputs().HasTag(kAllowTag) || cc->Inputs().HasTag(kDisallowTag);
-    // Only one of input_side_packet or input_stream may specify ALLOW/DISALLOW
-    // input.
-    RET_CHECK(input_via_side_packet ^ input_via_stream);
 
+    // Only one of input_side_packet or input_stream may specify
+    // ALLOW/DISALLOW input.
     if (input_via_side_packet) {
+      RET_CHECK(!input_via_stream);
       RET_CHECK(cc->InputSidePackets().HasTag(kAllowTag) ^
                 cc->InputSidePackets().HasTag(kDisallowTag));
 
       if (cc->InputSidePackets().HasTag(kAllowTag)) {
-        cc->InputSidePackets().Tag(kAllowTag).Set<bool>();
+        cc->InputSidePackets().Tag(kAllowTag).Set<bool>().Optional();
       } else {
-        cc->InputSidePackets().Tag(kDisallowTag).Set<bool>();
+        cc->InputSidePackets().Tag(kDisallowTag).Set<bool>().Optional();
       }
-    } else {
+    }
+    if (input_via_stream) {
+      RET_CHECK(!input_via_side_packet);
       RET_CHECK(cc->Inputs().HasTag(kAllowTag) ^
                 cc->Inputs().HasTag(kDisallowTag));
 
@@ -139,7 +142,6 @@ class GateCalculator : public CalculatorBase {
   }
 
   absl::Status Open(CalculatorContext* cc) final {
-    use_side_packet_for_allow_disallow_ = false;
     if (cc->InputSidePackets().HasTag(kAllowTag)) {
       use_side_packet_for_allow_disallow_ = true;
       allow_by_side_packet_decision_ =
@@ -158,12 +160,20 @@ class GateCalculator : public CalculatorBase {
     const auto& options = cc->Options<::mediapipe::GateCalculatorOptions>();
     empty_packets_as_allow_ = options.empty_packets_as_allow();
 
+    if (!use_side_packet_for_allow_disallow_ &&
+        !cc->Inputs().HasTag(kAllowTag) && !cc->Inputs().HasTag(kDisallowTag)) {
+      use_option_for_allow_disallow_ = true;
+      allow_by_option_decision_ = options.allow();
+    }
+
     return absl::OkStatus();
   }
 
   absl::Status Process(CalculatorContext* cc) final {
     bool allow = empty_packets_as_allow_;
-    if (use_side_packet_for_allow_disallow_) {
+    if (use_option_for_allow_disallow_) {
+      allow = allow_by_option_decision_;
+    } else if (use_side_packet_for_allow_disallow_) {
       allow = allow_by_side_packet_decision_;
     } else {
       if (cc->Inputs().HasTag(kAllowTag) &&
@@ -217,8 +227,10 @@ class GateCalculator : public CalculatorBase {
   GateState last_gate_state_ = GATE_UNINITIALIZED;
   int num_data_streams_;
   bool empty_packets_as_allow_;
-  bool use_side_packet_for_allow_disallow_;
+  bool use_side_packet_for_allow_disallow_ = false;
   bool allow_by_side_packet_decision_;
+  bool use_option_for_allow_disallow_ = false;
+  bool allow_by_option_decision_;
 };
 REGISTER_CALCULATOR(GateCalculator);
 

mediapipe/calculators/core/gate_calculator.proto

@@ -29,4 +29,8 @@ message GateCalculatorOptions {
   // disallowing the corresponding packets in the data input streams. Setting
   // this option to true inverts that, allowing the data packets to go through.
   optional bool empty_packets_as_allow = 1;
+
+  // Whether to allow or disallow the input streams to pass when no
+  // ALLOW/DISALLOW input or side input is specified.
+  optional bool allow = 2 [default = false];
 }

mediapipe/calculators/core/gate_calculator_test.cc

@@ -113,6 +113,68 @@ TEST_F(GateCalculatorTest, InvalidInputs) {
   )")));
 }
 
+TEST_F(GateCalculatorTest, AllowByALLOWOptionToTrue) {
+  SetRunner(R"(
+        calculator: "GateCalculator"
+        input_stream: "test_input"
+        output_stream: "test_output"
+        options: {
+          [mediapipe.GateCalculatorOptions.ext] {
+            allow: true
+          }
+        }
+  )");
+
+  constexpr int64 kTimestampValue0 = 42;
+  RunTimeStep(kTimestampValue0, true);
+  constexpr int64 kTimestampValue1 = 43;
+  RunTimeStep(kTimestampValue1, false);
+
+  const std::vector<Packet>& output = runner()->Outputs().Get("", 0).packets;
+  ASSERT_EQ(2, output.size());
+  EXPECT_EQ(kTimestampValue0, output[0].Timestamp().Value());
+  EXPECT_EQ(kTimestampValue1, output[1].Timestamp().Value());
+  EXPECT_EQ(true, output[0].Get<bool>());
+  EXPECT_EQ(false, output[1].Get<bool>());
+}
+
+TEST_F(GateCalculatorTest, DisallowByALLOWOptionSetToFalse) {
+  SetRunner(R"(
+        calculator: "GateCalculator"
+        input_stream: "test_input"
+        output_stream: "test_output"
+        options: {
+          [mediapipe.GateCalculatorOptions.ext] {
+            allow: false
+          }
+        }
+  )");
+
+  constexpr int64 kTimestampValue0 = 42;
+  RunTimeStep(kTimestampValue0, true);
+  constexpr int64 kTimestampValue1 = 43;
+  RunTimeStep(kTimestampValue1, false);
+
+  const std::vector<Packet>& output = runner()->Outputs().Get("", 0).packets;
+  ASSERT_EQ(0, output.size());
+}
+
+TEST_F(GateCalculatorTest, DisallowByALLOWOptionNotSet) {
+  SetRunner(R"(
+        calculator: "GateCalculator"
+        input_stream: "test_input"
+        output_stream: "test_output"
+  )");
+
+  constexpr int64 kTimestampValue0 = 42;
+  RunTimeStep(kTimestampValue0, true);
+  constexpr int64 kTimestampValue1 = 43;
+  RunTimeStep(kTimestampValue1, false);
+
+  const std::vector<Packet>& output = runner()->Outputs().Get("", 0).packets;
+  ASSERT_EQ(0, output.size());
+}
+
 TEST_F(GateCalculatorTest, AllowByALLOWSidePacketSetToTrue) {
   SetRunner(R"(
         calculator: "GateCalculator"

mediapipe/calculators/image/BUILD

@@ -661,3 +661,138 @@ cc_test(
         "//mediapipe/framework/port:parse_text_proto",
     ],
 )
+
+cc_library(
+    name = "affine_transformation",
+    hdrs = ["affine_transformation.h"],
+    deps = ["@com_google_absl//absl/status:statusor"],
+)
+
+cc_library(
+    name = "affine_transformation_runner_gl",
+    srcs = ["affine_transformation_runner_gl.cc"],
+    hdrs = ["affine_transformation_runner_gl.h"],
+    deps = [
+        ":affine_transformation",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/port:ret_check",
+        "//mediapipe/gpu:gl_calculator_helper",
+        "//mediapipe/gpu:gl_simple_shaders",
+        "//mediapipe/gpu:gpu_buffer",
+        "//mediapipe/gpu:gpu_origin_cc_proto",
+        "//mediapipe/gpu:shader_util",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@eigen_archive//:eigen3",
+    ],
+)
+
+cc_library(
+    name = "affine_transformation_runner_opencv",
+    srcs = ["affine_transformation_runner_opencv.cc"],
+    hdrs = ["affine_transformation_runner_opencv.h"],
+    deps = [
+        ":affine_transformation",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/formats:image_frame_opencv",
+        "//mediapipe/framework/port:opencv_core",
+        "//mediapipe/framework/port:opencv_imgproc",
+        "//mediapipe/framework/port:ret_check",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/status:statusor",
+        "@eigen_archive//:eigen3",
+    ],
+)
+
+mediapipe_proto_library(
+    name = "warp_affine_calculator_proto",
+    srcs = ["warp_affine_calculator.proto"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:calculator_options_proto",
+        "//mediapipe/framework:calculator_proto",
+        "//mediapipe/gpu:gpu_origin_proto",
+    ],
+)
+
+cc_library(
+    name = "warp_affine_calculator",
+    srcs = ["warp_affine_calculator.cc"],
+    hdrs = ["warp_affine_calculator.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        ":affine_transformation",
+        ":affine_transformation_runner_opencv",
+        ":warp_affine_calculator_cc_proto",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/framework/formats:image",
+        "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/port:ret_check",
+        "//mediapipe/framework/port:status",
+    ] + select({
+        "//mediapipe/gpu:disable_gpu": [],
+        "//conditions:default": [
+            "//mediapipe/gpu:gl_calculator_helper",
+            "//mediapipe/gpu:gpu_buffer",
+            ":affine_transformation_runner_gl",
+        ],
+    }),
+    alwayslink = 1,
+)
+
+cc_test(
+    name = "warp_affine_calculator_test",
+    srcs = ["warp_affine_calculator_test.cc"],
+    data = [
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/input.jpg",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect_keep_aspect.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect_keep_aspect_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect_keep_aspect_with_rotation.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/large_sub_rect_keep_aspect_with_rotation_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_keep_aspect.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_keep_aspect_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_keep_aspect_with_rotation.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_keep_aspect_with_rotation_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_with_rotation.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/medium_sub_rect_with_rotation_border_zero.png",
+        "//mediapipe/calculators/tensor:testdata/image_to_tensor/noop_except_range.png",
+    ],
+    tags = ["desktop_only_test"],
+    deps = [
+        ":affine_transformation",
+        ":warp_affine_calculator",
+        "//mediapipe/calculators/image:image_transformation_calculator",
+        "//mediapipe/calculators/tensor:image_to_tensor_converter",
+        "//mediapipe/calculators/tensor:image_to_tensor_utils",
+        "//mediapipe/calculators/util:from_image_calculator",
+        "//mediapipe/calculators/util:to_image_calculator",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework:calculator_runner",
+        "//mediapipe/framework/deps:file_path",
+        "//mediapipe/framework/formats:image",
+        "//mediapipe/framework/formats:image_format_cc_proto",
+        "//mediapipe/framework/formats:image_frame",
+        "//mediapipe/framework/formats:image_frame_opencv",
+        "//mediapipe/framework/formats:rect_cc_proto",
+        "//mediapipe/framework/formats:tensor",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/framework/port:integral_types",
+        "//mediapipe/framework/port:opencv_core",
+        "//mediapipe/framework/port:opencv_imgcodecs",
+        "//mediapipe/framework/port:opencv_imgproc",
+        "//mediapipe/framework/port:parse_text_proto",
+        "//mediapipe/gpu:gpu_buffer_to_image_frame_calculator",
+        "//mediapipe/gpu:image_frame_to_gpu_buffer_calculator",
+        "@com_google_absl//absl/flags:flag",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/strings",
+    ],
+)

mediapipe/calculators/image/affine_transformation.h

@@ -0,0 +1,55 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_H_
+#define MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_H_
+
+#include <array>
+
+#include "absl/status/statusor.h"
+
+namespace mediapipe {
+
+class AffineTransformation {
+ public:
+  // Pixel extrapolation method.
+  // When converting image to tensor it may happen that tensor needs to read
+  // pixels outside image boundaries. Border mode helps to specify how such
+  // pixels will be calculated.
+  enum class BorderMode { kZero, kReplicate };
+
+  struct Size {
+    int width;
+    int height;
+  };
+
+  template <typename InputT, typename OutputT>
+  class Runner {
+   public:
+    virtual ~Runner() = default;
+
+    // Transforms input into output using @matrix as following:
+    //   output(x, y) = input(matrix[0] * x + matrix[1] * y + matrix[3],
+    //                        matrix[4] * x + matrix[5] * y + matrix[7])
+    // where x and y ranges are defined by @output_size.
+    virtual absl::StatusOr<OutputT> Run(const InputT& input,
+                                        const std::array<float, 16>& matrix,
+                                        const Size& output_size,
+                                        BorderMode border_mode) = 0;
+  };
+};
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_H_

mediapipe/calculators/image/affine_transformation_runner_gl.cc

@@ -0,0 +1,354 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/image/affine_transformation_runner_gl.h"
+
+#include <memory>
+#include <optional>
+
+#include "Eigen/Core"
+#include "Eigen/Geometry"
+#include "Eigen/LU"
+#include "absl/memory/memory.h"
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/image/affine_transformation.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/port/ret_check.h"
+#include "mediapipe/gpu/gl_calculator_helper.h"
+#include "mediapipe/gpu/gl_simple_shaders.h"
+#include "mediapipe/gpu/gpu_buffer.h"
+#include "mediapipe/gpu/gpu_origin.pb.h"
+#include "mediapipe/gpu/shader_util.h"
+
+namespace mediapipe {
+
+namespace {
+
+using mediapipe::GlCalculatorHelper;
+using mediapipe::GlhCreateProgram;
+using mediapipe::GlTexture;
+using mediapipe::GpuBuffer;
+using mediapipe::GpuOrigin;
+
+bool IsMatrixVerticalFlipNeeded(GpuOrigin::Mode gpu_origin) {
+  switch (gpu_origin) {
+    case GpuOrigin::DEFAULT:
+    case GpuOrigin::CONVENTIONAL:
+#ifdef __APPLE__
+      return false;
+#else
+      return true;
+#endif  //  __APPLE__
+    case GpuOrigin::TOP_LEFT:
+      return false;
+  }
+}
+
+#ifdef __APPLE__
+#define GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED 0
+#else
+#define GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED 1
+#endif  //  __APPLE__
+
+bool IsGlClampToBorderSupported(const mediapipe::GlContext& gl_context) {
+  return gl_context.gl_major_version() > 3 ||
+         (gl_context.gl_major_version() == 3 &&
+          gl_context.gl_minor_version() >= 2);
+}
+
+constexpr int kAttribVertex = 0;
+constexpr int kAttribTexturePosition = 1;
+constexpr int kNumAttributes = 2;
+
+class GlTextureWarpAffineRunner
+    : public AffineTransformation::Runner<GpuBuffer,
+                                          std::unique_ptr<GpuBuffer>> {
+ public:
+  GlTextureWarpAffineRunner(std::shared_ptr<GlCalculatorHelper> gl_helper,
+                            GpuOrigin::Mode gpu_origin)
+      : gl_helper_(gl_helper), gpu_origin_(gpu_origin) {}
+  absl::Status Init() {
+    return gl_helper_->RunInGlContext([this]() -> absl::Status {
+      const GLint attr_location[kNumAttributes] = {
+          kAttribVertex,
+          kAttribTexturePosition,
+      };
+      const GLchar* attr_name[kNumAttributes] = {
+          "position",
+          "texture_coordinate",
+      };
+
+      constexpr GLchar kVertShader[] = R"(
+            in vec4 position;
+            in mediump vec4 texture_coordinate;
+            out mediump vec2 sample_coordinate;
+            uniform mat4 transform_matrix;
+
+            void main() {
+              gl_Position = position;
+              vec4 tc = transform_matrix * texture_coordinate;
+              sample_coordinate = tc.xy;
+            }
+          )";
+
+      constexpr GLchar kFragShader[] = R"(
+            DEFAULT_PRECISION(mediump, float)
+            in vec2 sample_coordinate;
+            uniform sampler2D input_texture;
+
+          #ifdef GL_ES
+            #define fragColor gl_FragColor
+          #else
+            out vec4 fragColor;
+          #endif  // defined(GL_ES);
+
+            void main() {
+              vec4 color = texture2D(input_texture, sample_coordinate);
+          #ifdef CUSTOM_ZERO_BORDER_MODE
+              float out_of_bounds =
+                  float(sample_coordinate.x < 0.0 || sample_coordinate.x > 1.0 ||
+                        sample_coordinate.y < 0.0 || sample_coordinate.y > 1.0);
+              color = mix(color, vec4(0.0, 0.0, 0.0, 0.0), out_of_bounds);
+          #endif  // defined(CUSTOM_ZERO_BORDER_MODE)
+              fragColor = color;
+            }
+          )";
+
+      // Create program and set parameters.
+      auto create_fn = [&](const std::string& vs,
+                           const std::string& fs) -> absl::StatusOr<Program> {
+        GLuint program = 0;
+        GlhCreateProgram(vs.c_str(), fs.c_str(), kNumAttributes, &attr_name[0],
+                         attr_location, &program);
+
+        RET_CHECK(program) << "Problem initializing warp affine program.";
+        glUseProgram(program);
+        glUniform1i(glGetUniformLocation(program, "input_texture"), 1);
+        GLint matrix_id = glGetUniformLocation(program, "transform_matrix");
+        return Program{.id = program, .matrix_id = matrix_id};
+      };
+
+      const std::string vert_src =
+          absl::StrCat(mediapipe::kMediaPipeVertexShaderPreamble, kVertShader);
+
+      const std::string frag_src = absl::StrCat(
+          mediapipe::kMediaPipeFragmentShaderPreamble, kFragShader);
+
+      ASSIGN_OR_RETURN(program_, create_fn(vert_src, frag_src));
+
+      auto create_custom_zero_fn = [&]() -> absl::StatusOr<Program> {
+        std::string custom_zero_border_mode_def = R"(
+          #define CUSTOM_ZERO_BORDER_MODE
+        )";
+        const std::string frag_custom_zero_src =
+            absl::StrCat(mediapipe::kMediaPipeFragmentShaderPreamble,
+                         custom_zero_border_mode_def, kFragShader);
+        return create_fn(vert_src, frag_custom_zero_src);
+      };
+#if GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED
+      if (!IsGlClampToBorderSupported(gl_helper_->GetGlContext())) {
+        ASSIGN_OR_RETURN(program_custom_zero_, create_custom_zero_fn());
+      }
+#else
+      ASSIGN_OR_RETURN(program_custom_zero_, create_custom_zero_fn());
+#endif  // GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED
+
+      glGenFramebuffers(1, &framebuffer_);
+
+      // vertex storage
+      glGenBuffers(2, vbo_);
+      glGenVertexArrays(1, &vao_);
+
+      // vbo 0
+      glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
+      glBufferData(GL_ARRAY_BUFFER, sizeof(mediapipe::kBasicSquareVertices),
+                   mediapipe::kBasicSquareVertices, GL_STATIC_DRAW);
+
+      // vbo 1
+      glBindBuffer(GL_ARRAY_BUFFER, vbo_[1]);
+      glBufferData(GL_ARRAY_BUFFER, sizeof(mediapipe::kBasicTextureVertices),
+                   mediapipe::kBasicTextureVertices, GL_STATIC_DRAW);
+
+      glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+      return absl::OkStatus();
+    });
+  }
+
+  absl::StatusOr<std::unique_ptr<GpuBuffer>> Run(
+      const GpuBuffer& input, const std::array<float, 16>& matrix,
+      const AffineTransformation::Size& size,
+      AffineTransformation::BorderMode border_mode) override {
+    std::unique_ptr<GpuBuffer> gpu_buffer;
+    MP_RETURN_IF_ERROR(
+        gl_helper_->RunInGlContext([this, &input, &matrix, &size, &border_mode,
+                                    &gpu_buffer]() -> absl::Status {
+          auto input_texture = gl_helper_->CreateSourceTexture(input);
+          auto output_texture = gl_helper_->CreateDestinationTexture(
+              size.width, size.height, input.format());
+
+          MP_RETURN_IF_ERROR(
+              RunInternal(input_texture, matrix, border_mode, &output_texture));
+          gpu_buffer = output_texture.GetFrame<GpuBuffer>();
+          return absl::OkStatus();
+        }));
+
+    return gpu_buffer;
+  }
+
+  absl::Status RunInternal(const GlTexture& texture,
+                           const std::array<float, 16>& matrix,
+                           AffineTransformation::BorderMode border_mode,
+                           GlTexture* output) {
+    glDisable(GL_DEPTH_TEST);
+    glBindFramebuffer(GL_FRAMEBUFFER, framebuffer_);
+    glViewport(0, 0, output->width(), output->height());
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, output->name());
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                           output->name(), 0);
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(texture.target(), texture.name());
+
+    // a) Filtering.
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    // b) Clamping.
+    std::optional<Program> program = program_;
+    switch (border_mode) {
+      case AffineTransformation::BorderMode::kReplicate: {
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+        break;
+      }
+      case AffineTransformation::BorderMode::kZero: {
+#if GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED
+        if (program_custom_zero_) {
+          program = program_custom_zero_;
+        } else {
+          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+          glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+          glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR,
+                           std::array<float, 4>{0.0f, 0.0f, 0.0f, 0.0f}.data());
+        }
+#else
+        RET_CHECK(program_custom_zero_)
+            << "Program must have been initialized.";
+        program = program_custom_zero_;
+#endif  // GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED
+        break;
+      }
+    }
+    glUseProgram(program->id);
+
+    Eigen::Matrix<float, 4, 4, Eigen::RowMajor> eigen_mat(matrix.data());
+    if (IsMatrixVerticalFlipNeeded(gpu_origin_)) {
+      // @matrix describes affine transformation in terms of TOP LEFT origin, so
+      // in some cases/on some platforms an extra flipping should be done before
+      // and after.
+      const Eigen::Matrix<float, 4, 4, Eigen::RowMajor> flip_y(
+          {{1.0f, 0.0f, 0.0f, 0.0f},
+           {0.0f, -1.0f, 0.0f, 1.0f},
+           {0.0f, 0.0f, 1.0f, 0.0f},
+           {0.0f, 0.0f, 0.0f, 1.0f}});
+      eigen_mat = flip_y * eigen_mat * flip_y;
+    }
+
+    // If GL context is ES2, then GL_FALSE must be used for 'transpose'
+    // GLboolean in glUniformMatrix4fv, or else INVALID_VALUE error is reported.
+    // Hence, transposing the matrix and always passing transposed.
+    eigen_mat.transposeInPlace();
+    glUniformMatrix4fv(program->matrix_id, 1, GL_FALSE, eigen_mat.data());
+
+    // vao
+    glBindVertexArray(vao_);
+
+    // vbo 0
+    glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
+    glEnableVertexAttribArray(kAttribVertex);
+    glVertexAttribPointer(kAttribVertex, 2, GL_FLOAT, 0, 0, nullptr);
+
+    // vbo 1
+    glBindBuffer(GL_ARRAY_BUFFER, vbo_[1]);
+    glEnableVertexAttribArray(kAttribTexturePosition);
+    glVertexAttribPointer(kAttribTexturePosition, 2, GL_FLOAT, 0, 0, nullptr);
+
+    // draw
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    // Resetting to MediaPipe texture param defaults.
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    glDisableVertexAttribArray(kAttribVertex);
+    glDisableVertexAttribArray(kAttribTexturePosition);
+    glBindBuffer(GL_ARRAY_BUFFER, 0);
+    glBindVertexArray(0);
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    return absl::OkStatus();
+  }
+
+  ~GlTextureWarpAffineRunner() override {
+    gl_helper_->RunInGlContext([this]() {
+      // Release OpenGL resources.
+      if (framebuffer_ != 0) glDeleteFramebuffers(1, &framebuffer_);
+      if (program_.id != 0) glDeleteProgram(program_.id);
+      if (program_custom_zero_ && program_custom_zero_->id != 0) {
+        glDeleteProgram(program_custom_zero_->id);
+      }
+      if (vao_ != 0) glDeleteVertexArrays(1, &vao_);
+      glDeleteBuffers(2, vbo_);
+    });
+  }
+
+ private:
+  struct Program {
+    GLuint id;
+    GLint matrix_id;
+  };
+  std::shared_ptr<GlCalculatorHelper> gl_helper_;
+  GpuOrigin::Mode gpu_origin_;
+  GLuint vao_ = 0;
+  GLuint vbo_[2] = {0, 0};
+  Program program_;
+  std::optional<Program> program_custom_zero_;
+  GLuint framebuffer_ = 0;
+};
+
+#undef GL_CLAMP_TO_BORDER_MAY_BE_SUPPORTED
+
+}  // namespace
+
+absl::StatusOr<std::unique_ptr<
+    AffineTransformation::Runner<GpuBuffer, std::unique_ptr<GpuBuffer>>>>
+CreateAffineTransformationGlRunner(
+    std::shared_ptr<GlCalculatorHelper> gl_helper, GpuOrigin::Mode gpu_origin) {
+  auto runner =
+      absl::make_unique<GlTextureWarpAffineRunner>(gl_helper, gpu_origin);
+  MP_RETURN_IF_ERROR(runner->Init());
+  return runner;
+}
+
+}  // namespace mediapipe

mediapipe/calculators/image/affine_transformation_runner_gl.h

@@ -0,0 +1,36 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_GL_H_
+#define MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_GL_H_
+
+#include <memory>
+
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/image/affine_transformation.h"
+#include "mediapipe/gpu/gl_calculator_helper.h"
+#include "mediapipe/gpu/gpu_buffer.h"
+#include "mediapipe/gpu/gpu_origin.pb.h"
+
+namespace mediapipe {
+
+absl::StatusOr<std::unique_ptr<AffineTransformation::Runner<
+    mediapipe::GpuBuffer, std::unique_ptr<mediapipe::GpuBuffer>>>>
+CreateAffineTransformationGlRunner(
+    std::shared_ptr<mediapipe::GlCalculatorHelper> gl_helper,
+    mediapipe::GpuOrigin::Mode gpu_origin);
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_GL_H_

mediapipe/calculators/image/affine_transformation_runner_opencv.cc

@@ -0,0 +1,160 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/image/affine_transformation_runner_opencv.h"
+
+#include <memory>
+
+#include "absl/memory/memory.h"
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/image/affine_transformation.h"
+#include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/formats/image_frame_opencv.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+#include "mediapipe/framework/port/opencv_imgproc_inc.h"
+#include "mediapipe/framework/port/ret_check.h"
+
+namespace mediapipe {
+
+namespace {
+
+cv::BorderTypes GetBorderModeForOpenCv(
+    AffineTransformation::BorderMode border_mode) {
+  switch (border_mode) {
+    case AffineTransformation::BorderMode::kZero:
+      return cv::BORDER_CONSTANT;
+    case AffineTransformation::BorderMode::kReplicate:
+      return cv::BORDER_REPLICATE;
+  }
+}
+
+class OpenCvRunner
+    : public AffineTransformation::Runner<ImageFrame, ImageFrame> {
+ public:
+  absl::StatusOr<ImageFrame> Run(
+      const ImageFrame& input, const std::array<float, 16>& matrix,
+      const AffineTransformation::Size& size,
+      AffineTransformation::BorderMode border_mode) override {
+    // OpenCV warpAffine works in absolute coordinates, so the transfom (which
+    // accepts and produces relative coordinates) should be adjusted to first
+    // normalize coordinates and then scale them.
+    // clang-format off
+    cv::Matx44f normalize_dst_coordinate({
+      1.0f / size.width, 0.0f,               0.0f, 0.0f,
+      0.0f,              1.0f / size.height, 0.0f, 0.0f,
+      0.0f,              0.0f,               1.0f, 0.0f,
+      0.0f,              0.0f,               0.0f, 1.0f});
+    cv::Matx44f scale_src_coordinate({
+      1.0f * input.Width(), 0.0f,                  0.0f, 0.0f,
+      0.0f,                 1.0f * input.Height(), 0.0f, 0.0f,
+      0.0f,                 0.0f,                  1.0f, 0.0f,
+      0.0f,                 0.0f,                  0.0f, 1.0f});
+    // clang-format on
+    cv::Matx44f adjust_dst_coordinate;
+    cv::Matx44f adjust_src_coordinate;
+    // TODO: update to always use accurate implementation.
+    constexpr bool kOpenCvCompatibility = true;
+    if (kOpenCvCompatibility) {
+      adjust_dst_coordinate = normalize_dst_coordinate;
+      adjust_src_coordinate = scale_src_coordinate;
+    } else {
+      // To do an accurate affine image transformation and make "on-cpu" and
+      // "on-gpu" calculations aligned - extra offset is required to select
+      // correct pixels.
+      //
+      // Each destination pixel corresponds to some pixels region from source
+      // image.(In case of downscaling there can be more than one pixel.) The
+      // offset for x and y is calculated in the way, so pixel in the middle of
+      // the region is selected.
+      //
+      // For simplicity sake, let's consider downscaling from 100x50 to 10x10
+      // without a rotation:
+      // 1. Each destination pixel corresponds to 10x5 region
+      //    X range: [0, .. , 9]
+      //    Y range: [0, .. , 4]
+      // 2. Considering we have __discrete__ pixels, the center of the region is
+      //    between (4, 2) and (5, 2) pixels, let's assume it's a "pixel"
+      //    (4.5, 2).
+      // 3. When using the above as an offset for every pixel select while
+      //    downscaling, resulting pixels are:
+      //      (4.5, 2), (14.5, 2), .. , (94.5, 2)
+      //      (4.5, 7), (14.5, 7), .. , (94.5, 7)
+      //      ..
+      //      (4.5, 47), (14.5, 47), .., (94.5, 47)
+      //    instead of:
+      //      (0, 0), (10, 0), .. , (90, 0)
+      //      (0, 5), (10, 7), .. , (90, 5)
+      //      ..
+      //      (0, 45), (10, 45), .., (90, 45)
+      //    The latter looks shifted.
+      //
+      // Offsets are needed, so that __discrete__ pixel at (0, 0) corresponds to
+      // the same pixel as would __non discrete__ pixel at (0.5, 0.5). Hence,
+      // transformation matrix should shift coordinates by (0.5, 0.5) as the
+      // very first step.
+      //
+      // Due to the above shift, transformed coordinates would be valid for
+      // float coordinates where pixel (0, 0) spans [0.0, 1.0) x [0.0, 1.0).
+      // T0 make it valid for __discrete__ pixels, transformation matrix should
+      // shift coordinate by (-0.5f, -0.5f) as the very last step. (E.g. if we
+      // get (0.5f, 0.5f), then it's (0, 0) __discrete__ pixel.)
+      // clang-format off
+      cv::Matx44f shift_dst({1.0f, 0.0f, 0.0f, 0.5f,
+                              0.0f, 1.0f, 0.0f, 0.5f,
+                              0.0f, 0.0f, 1.0f, 0.0f,
+                              0.0f, 0.0f, 0.0f, 1.0f});
+      cv::Matx44f shift_src({1.0f, 0.0f, 0.0f, -0.5f,
+                              0.0f, 1.0f, 0.0f, -0.5f,
+                              0.0f, 0.0f, 1.0f,  0.0f,
+                              0.0f, 0.0f, 0.0f,  1.0f});
+      // clang-format on
+      adjust_dst_coordinate = normalize_dst_coordinate * shift_dst;
+      adjust_src_coordinate = shift_src * scale_src_coordinate;
+    }
+
+    cv::Matx44f transform(matrix.data());
+    cv::Matx44f transform_absolute =
+        adjust_src_coordinate * transform * adjust_dst_coordinate;
+
+    cv::Mat in_mat = formats::MatView(&input);
+
+    cv::Mat cv_affine_transform(2, 3, CV_32F);
+    cv_affine_transform.at<float>(0, 0) = transform_absolute.val[0];
+    cv_affine_transform.at<float>(0, 1) = transform_absolute.val[1];
+    cv_affine_transform.at<float>(0, 2) = transform_absolute.val[3];
+    cv_affine_transform.at<float>(1, 0) = transform_absolute.val[4];
+    cv_affine_transform.at<float>(1, 1) = transform_absolute.val[5];
+    cv_affine_transform.at<float>(1, 2) = transform_absolute.val[7];
+
+    ImageFrame out_image(input.Format(), size.width, size.height);
+    cv::Mat out_mat = formats::MatView(&out_image);
+
+    cv::warpAffine(in_mat, out_mat, cv_affine_transform,
+                   cv::Size(out_mat.cols, out_mat.rows),
+                   /*flags=*/cv::INTER_LINEAR | cv::WARP_INVERSE_MAP,
+                   GetBorderModeForOpenCv(border_mode));
+
+    return out_image;
+  }
+};
+
+}  // namespace
+
+absl::StatusOr<
+    std::unique_ptr<AffineTransformation::Runner<ImageFrame, ImageFrame>>>
+CreateAffineTransformationOpenCvRunner() {
+  return absl::make_unique<OpenCvRunner>();
+}
+
+}  // namespace mediapipe

mediapipe/calculators/image/affine_transformation_runner_opencv.h

@@ -0,0 +1,32 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_OPENCV_H_
+#define MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_OPENCV_H_
+
+#include <memory>
+
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/image/affine_transformation.h"
+#include "mediapipe/framework/formats/image_frame.h"
+
+namespace mediapipe {
+
+absl::StatusOr<
+    std::unique_ptr<AffineTransformation::Runner<ImageFrame, ImageFrame>>>
+CreateAffineTransformationOpenCvRunner();
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_IMAGE_AFFINE_TRANSFORMATION_RUNNER_OPENCV_H_

mediapipe/calculators/image/scale_image_calculator.cc

@@ -262,6 +262,7 @@ absl::Status ScaleImageCalculator::InitializeFrameInfo(CalculatorContext* cc) {
       scale_image::FindOutputDimensions(crop_width_, crop_height_,         //
                                         options_.target_width(),           //
                                         options_.target_height(),          //
+                                        options_.target_max_area(),        //
                                         options_.preserve_aspect_ratio(),  //
                                         options_.scale_to_multiple_of(),   //
                                         &output_width_, &output_height_));

mediapipe/calculators/image/scale_image_calculator.proto

@@ -28,6 +28,11 @@ message ScaleImageCalculatorOptions {
   optional int32 target_width = 1;
   optional int32 target_height = 2;
 
+  // If set, then automatically calculates a target_width and target_height that
+  // has an area below the target max area. Aspect ratio preservation cannot be
+  // disabled.
+  optional int32 target_max_area = 15;
+
   // If true, the image is scaled up or down proportionally so that it
   // fits inside the box represented by target_width and target_height.
   // Otherwise it is scaled to fit target_width and target_height

mediapipe/calculators/image/scale_image_utils.cc

@@ -92,12 +92,21 @@ absl::Status FindOutputDimensions(int input_width,             //
                                   int input_height,            //
                                   int target_width,            //
                                   int target_height,           //
+                                  int target_max_area,         //
                                   bool preserve_aspect_ratio,  //
                                   int scale_to_multiple_of,    //
                                   int* output_width, int* output_height) {
   CHECK(output_width);
   CHECK(output_height);
 
+  if (target_max_area > 0 && input_width * input_height > target_max_area) {
+    preserve_aspect_ratio = true;
+    target_height = static_cast<int>(sqrt(static_cast<double>(target_max_area) /
+                                          (static_cast<double>(input_width) /
+                                           static_cast<double>(input_height))));
+    target_width = -1;  // Resize width to preserve aspect ratio.
+  }
+
   if (preserve_aspect_ratio) {
     RET_CHECK(scale_to_multiple_of == 2)
         << "FindOutputDimensions always outputs width and height that are "
@@ -164,5 +173,17 @@ absl::Status FindOutputDimensions(int input_width,             //
       << "Unable to set output dimensions based on target dimensions.";
 }
 
+absl::Status FindOutputDimensions(int input_width,             //
+                                  int input_height,            //
+                                  int target_width,            //
+                                  int target_height,           //
+                                  bool preserve_aspect_ratio,  //
+                                  int scale_to_multiple_of,    //
+                                  int* output_width, int* output_height) {
+  return FindOutputDimensions(
+      input_width, input_height, target_width, target_height, -1,
+      preserve_aspect_ratio, scale_to_multiple_of, output_width, output_height);
+}
+
 }  // namespace scale_image
 }  // namespace mediapipe

mediapipe/calculators/image/scale_image_utils.h

@@ -34,15 +34,25 @@ absl::Status FindCropDimensions(int input_width, int input_height,    //
                                 int* crop_width, int* crop_height,    //
                                 int* col_start, int* row_start);
 
-// Given an input width and height, a target width and height, whether to
+// Given an input width and height, a target width and height or max area,
-// preserve the aspect ratio, and whether to round-down to the multiple of a
+// whether to preserve the aspect ratio, and whether to round-down to the
-// given number nearest to the targets, determine the output width and height.
+// multiple of a given number nearest to the targets, determine the output width
-// If target_width or target_height is non-positive, then they will be set to
+// and height. If target_width or target_height is non-positive, then they will
-// the input_width and input_height respectively. If scale_to_multiple_of is
+// be set to the input_width and input_height respectively. If target_area is
-// less than 1, it will be treated like 1. The output_width and
+// non-positive, then it will be ignored. If scale_to_multiple_of is less than
-// output_height will be reduced as necessary to preserve_aspect_ratio if the
+// 1, it will be treated like 1. The output_width and output_height will be
-// option is specified. If preserving the aspect ratio is desired, you must set
+// reduced as necessary to preserve_aspect_ratio if the option is specified. If
-// scale_to_multiple_of to 2.
+// preserving the aspect ratio is desired, you must set scale_to_multiple_of
+// to 2.
+absl::Status FindOutputDimensions(int input_width, int input_height,  //
+                                  int target_width,
+                                  int target_height,           //
+                                  int target_max_area,         //
+                                  bool preserve_aspect_ratio,  //
+                                  int scale_to_multiple_of,    //
+                                  int* output_width, int* output_height);
+
+// Backwards compatible helper.
 absl::Status FindOutputDimensions(int input_width, int input_height,  //
                                   int target_width,
                                   int target_height,           //

mediapipe/calculators/image/scale_image_utils_test.cc

@@ -79,49 +79,49 @@ TEST(ScaleImageUtilsTest, FindOutputDimensionsPreserveRatio) {
   int output_width;
   int output_height;
   // Not scale.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(200, output_width);
   EXPECT_EQ(100, output_height);
   // Not scale with odd input size.
-  MP_ASSERT_OK(FindOutputDimensions(201, 101, -1, -1, false, 1, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(201, 101, -1, -1, -1, false, 1,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(201, output_width);
   EXPECT_EQ(101, output_height);
   // Scale down by 1/2.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(100, output_width);
   EXPECT_EQ(50, output_height);
   // Scale up, doubling dimensions.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, 200, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, 200, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(400, output_width);
   EXPECT_EQ(200, output_height);
   // Fits a 2:1 image into a 150 x 150 box. Output dimensions are always
   // visible by 2.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 150, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 150, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(150, output_width);
   EXPECT_EQ(74, output_height);
   // Fits a 2:1 image into a 400 x 50 box.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 400, 50, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 400, 50, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(100, output_width);
   EXPECT_EQ(50, output_height);
   // Scale to multiple number with odd targe size.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 101, -1, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 101, -1, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(100, output_width);
   EXPECT_EQ(50, output_height);
   // Scale to multiple number with odd targe size.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 101, -1, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 101, -1, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(100, output_width);
   EXPECT_EQ(50, output_height);
   // Scale to odd size.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 151, 101, false, 1, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 151, 101, -1, false, 1,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(151, output_width);
   EXPECT_EQ(101, output_height);
 }
@@ -131,18 +131,18 @@ TEST(ScaleImageUtilsTest, FindOutputDimensionsNoAspectRatio) {
   int output_width;
   int output_height;
   // Scale width only.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, false, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, -1, false, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(100, output_width);
   EXPECT_EQ(100, output_height);
   // Scale height only.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, 200, false, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, 200, -1, false, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(200, output_width);
   EXPECT_EQ(200, output_height);
   // Scale both dimensions.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 200, false, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 200, -1, false, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(150, output_width);
   EXPECT_EQ(200, output_height);
 }
@@ -152,41 +152,78 @@ TEST(ScaleImageUtilsTest, FindOutputDimensionsDownScaleToMultipleOf) {
   int output_width;
   int output_height;
   // Set no targets, downscale to a multiple of 8.
-  MP_ASSERT_OK(FindOutputDimensions(100, 100, -1, -1, false, 8, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(100, 100, -1, -1, -1, false, 8,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(96, output_width);
   EXPECT_EQ(96, output_height);
   // Set width target, downscale to a multiple of 8.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, false, 8, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 100, -1, -1, false, 8,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(96, output_width);
   EXPECT_EQ(96, output_height);
   // Set height target, downscale to a multiple of 8.
-  MP_ASSERT_OK(FindOutputDimensions(201, 101, -1, 201, false, 8, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(201, 101, -1, 201, -1, false, 8,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(200, output_width);
   EXPECT_EQ(200, output_height);
   // Set both targets, downscale to a multiple of 8.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 200, false, 8, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 150, 200, -1, false, 8,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(144, output_width);
   EXPECT_EQ(200, output_height);
   // Doesn't throw error if keep aspect is true and downscale multiple is 2.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 400, 200, true, 2, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 400, 200, -1, true, 2,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(400, output_width);
   EXPECT_EQ(200, output_height);
   // Throws error if keep aspect is true, but downscale multiple is not 2.
-  ASSERT_THAT(FindOutputDimensions(200, 100, 400, 200, true, 4, &output_width,
+  ASSERT_THAT(FindOutputDimensions(200, 100, 400, 200, -1, true, 4,
-                                   &output_height),
+                                   &output_width, &output_height),
               testing::Not(testing::status::IsOk()));
   // Downscaling to multiple ignored if multiple is less than 2.
-  MP_ASSERT_OK(FindOutputDimensions(200, 100, 401, 201, false, 1, &output_width,
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, 401, 201, -1, false, 1,
-                                    &output_height));
+                                    &output_width, &output_height));
   EXPECT_EQ(401, output_width);
   EXPECT_EQ(201, output_height);
 }
 
+// Tests scaling without keeping the aspect ratio fixed.
+TEST(ScaleImageUtilsTest, FindOutputDimensionsMaxArea) {
+  int output_width;
+  int output_height;
+  // Smaller area.
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, 9000, false, 2,
+                                    &output_width, &output_height));
+  EXPECT_NEAR(
+      200 / 100,
+      static_cast<double>(output_width) / static_cast<double>(output_height),
+      0.1f);
+  EXPECT_LE(output_width * output_height, 9000);
+  // Close to original area.
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, 19999, false, 2,
+                                    &output_width, &output_height));
+  EXPECT_NEAR(
+      200.0 / 100.0,
+      static_cast<double>(output_width) / static_cast<double>(output_height),
+      0.1f);
+  EXPECT_LE(output_width * output_height, 19999);
+  // Don't scale with larger area.
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, 20001, false, 2,
+                                    &output_width, &output_height));
+  EXPECT_EQ(200, output_width);
+  EXPECT_EQ(100, output_height);
+  // Don't scale with equal area.
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, 20000, false, 2,
+                                    &output_width, &output_height));
+  EXPECT_EQ(200, output_width);
+  EXPECT_EQ(100, output_height);
+  // Don't scale at all.
+  MP_ASSERT_OK(FindOutputDimensions(200, 100, -1, -1, -1, false, 2,
+                                    &output_width, &output_height));
+  EXPECT_EQ(200, output_width);
+  EXPECT_EQ(100, output_height);
+}
+
 }  // namespace
 }  // namespace scale_image
 }  // namespace mediapipe

mediapipe/calculators/image/warp_affine_calculator.cc

@@ -0,0 +1,211 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/image/warp_affine_calculator.h"
+
+#include <array>
+#include <cstdint>
+#include <memory>
+
+#include "mediapipe/calculators/image/affine_transformation.h"
+#if !MEDIAPIPE_DISABLE_GPU
+#include "mediapipe/calculators/image/affine_transformation_runner_gl.h"
+#endif  // !MEDIAPIPE_DISABLE_GPU
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "mediapipe/calculators/image/affine_transformation_runner_opencv.h"
+#include "mediapipe/calculators/image/warp_affine_calculator.pb.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/port/ret_check.h"
+#if !MEDIAPIPE_DISABLE_GPU
+#include "mediapipe/gpu/gl_calculator_helper.h"
+#include "mediapipe/gpu/gpu_buffer.h"
+#endif  // !MEDIAPIPE_DISABLE_GPU
+
+namespace mediapipe {
+
+namespace {
+
+AffineTransformation::BorderMode GetBorderMode(
+    mediapipe::WarpAffineCalculatorOptions::BorderMode border_mode) {
+  switch (border_mode) {
+    case mediapipe::WarpAffineCalculatorOptions::BORDER_ZERO:
+      return AffineTransformation::BorderMode::kZero;
+    case mediapipe::WarpAffineCalculatorOptions::BORDER_UNSPECIFIED:
+    case mediapipe::WarpAffineCalculatorOptions::BORDER_REPLICATE:
+      return AffineTransformation::BorderMode::kReplicate;
+  }
+}
+
+template <typename ImageT>
+class WarpAffineRunnerHolder {};
+
+template <>
+class WarpAffineRunnerHolder<ImageFrame> {
+ public:
+  using RunnerType = AffineTransformation::Runner<ImageFrame, ImageFrame>;
+  absl::Status Open(CalculatorContext* cc) { return absl::OkStatus(); }
+  absl::StatusOr<RunnerType*> GetRunner() {
+    if (!runner_) {
+      ASSIGN_OR_RETURN(runner_, CreateAffineTransformationOpenCvRunner());
+    }
+    return runner_.get();
+  }
+
+ private:
+  std::unique_ptr<RunnerType> runner_;
+};
+
+#if !MEDIAPIPE_DISABLE_GPU
+template <>
+class WarpAffineRunnerHolder<mediapipe::GpuBuffer> {
+ public:
+  using RunnerType =
+      AffineTransformation::Runner<mediapipe::GpuBuffer,
+                                   std::unique_ptr<mediapipe::GpuBuffer>>;
+  absl::Status Open(CalculatorContext* cc) {
+    gpu_origin_ =
+        cc->Options<mediapipe::WarpAffineCalculatorOptions>().gpu_origin();
+    gl_helper_ = std::make_shared<mediapipe::GlCalculatorHelper>();
+    return gl_helper_->Open(cc);
+  }
+  absl::StatusOr<RunnerType*> GetRunner() {
+    if (!runner_) {
+      ASSIGN_OR_RETURN(
+          runner_, CreateAffineTransformationGlRunner(gl_helper_, gpu_origin_));
+    }
+    return runner_.get();
+  }
+
+ private:
+  mediapipe::GpuOrigin::Mode gpu_origin_;
+  std::shared_ptr<mediapipe::GlCalculatorHelper> gl_helper_;
+  std::unique_ptr<RunnerType> runner_;
+};
+#endif  // !MEDIAPIPE_DISABLE_GPU
+
+template <>
+class WarpAffineRunnerHolder<mediapipe::Image> {
+ public:
+  absl::Status Open(CalculatorContext* cc) { return runner_.Open(cc); }
+  absl::StatusOr<
+      AffineTransformation::Runner<mediapipe::Image, mediapipe::Image>*>
+  GetRunner() {
+    return &runner_;
+  }
+
+ private:
+  class Runner : public AffineTransformation::Runner<mediapipe::Image,
+                                                     mediapipe::Image> {
+   public:
+    absl::Status Open(CalculatorContext* cc) {
+      MP_RETURN_IF_ERROR(cpu_holder_.Open(cc));
+#if !MEDIAPIPE_DISABLE_GPU
+      MP_RETURN_IF_ERROR(gpu_holder_.Open(cc));
+#endif  // !MEDIAPIPE_DISABLE_GPU
+      return absl::OkStatus();
+    }
+    absl::StatusOr<mediapipe::Image> Run(
+        const mediapipe::Image& input, const std::array<float, 16>& matrix,
+        const AffineTransformation::Size& size,
+        AffineTransformation::BorderMode border_mode) override {
+      if (input.UsesGpu()) {
+#if !MEDIAPIPE_DISABLE_GPU
+        ASSIGN_OR_RETURN(auto* runner, gpu_holder_.GetRunner());
+        ASSIGN_OR_RETURN(auto result, runner->Run(input.GetGpuBuffer(), matrix,
+                                                  size, border_mode));
+        return mediapipe::Image(*result);
+#else
+        return absl::UnavailableError("GPU support is disabled");
+#endif  // !MEDIAPIPE_DISABLE_GPU
+      }
+      ASSIGN_OR_RETURN(auto* runner, cpu_holder_.GetRunner());
+      const auto& frame_ptr = input.GetImageFrameSharedPtr();
+      // Wrap image into image frame.
+      const ImageFrame image_frame(frame_ptr->Format(), frame_ptr->Width(),
+                                   frame_ptr->Height(), frame_ptr->WidthStep(),
+                                   const_cast<uint8_t*>(frame_ptr->PixelData()),
+                                   [](uint8* data) {});
+      ASSIGN_OR_RETURN(auto result,
+                       runner->Run(image_frame, matrix, size, border_mode));
+      return mediapipe::Image(std::make_shared<ImageFrame>(std::move(result)));
+    }
+
+   private:
+    WarpAffineRunnerHolder<ImageFrame> cpu_holder_;
+#if !MEDIAPIPE_DISABLE_GPU
+    WarpAffineRunnerHolder<mediapipe::GpuBuffer> gpu_holder_;
+#endif  // !MEDIAPIPE_DISABLE_GPU
+  };
+
+  Runner runner_;
+};
+
+template <typename InterfaceT>
+class WarpAffineCalculatorImpl : public mediapipe::api2::NodeImpl<InterfaceT> {
+ public:
+#if !MEDIAPIPE_DISABLE_GPU
+  static absl::Status UpdateContract(CalculatorContract* cc) {
+    if constexpr (std::is_same_v<InterfaceT, WarpAffineCalculatorGpu> ||
+                  std::is_same_v<InterfaceT, WarpAffineCalculator>) {
+      MP_RETURN_IF_ERROR(mediapipe::GlCalculatorHelper::UpdateContract(cc));
+    }
+    return absl::OkStatus();
+  }
+#endif  // !MEDIAPIPE_DISABLE_GPU
+
+  absl::Status Open(CalculatorContext* cc) override { return holder_.Open(cc); }
+
+  absl::Status Process(CalculatorContext* cc) override {
+    if (InterfaceT::kInImage(cc).IsEmpty() ||
+        InterfaceT::kMatrix(cc).IsEmpty() ||
+        InterfaceT::kOutputSize(cc).IsEmpty()) {
+      return absl::OkStatus();
+    }
+    const std::array<float, 16>& transform = *InterfaceT::kMatrix(cc);
+    auto [out_width, out_height] = *InterfaceT::kOutputSize(cc);
+    AffineTransformation::Size output_size;
+    output_size.width = out_width;
+    output_size.height = out_height;
+    ASSIGN_OR_RETURN(auto* runner, holder_.GetRunner());
+    ASSIGN_OR_RETURN(
+        auto result,
+        runner->Run(
+            *InterfaceT::kInImage(cc), transform, output_size,
+            GetBorderMode(cc->Options<mediapipe::WarpAffineCalculatorOptions>()
+                              .border_mode())));
+    InterfaceT::kOutImage(cc).Send(std::move(result));
+
+    return absl::OkStatus();
+  }
+
+ private:
+  WarpAffineRunnerHolder<typename decltype(InterfaceT::kInImage)::PayloadT>
+      holder_;
+};
+
+}  // namespace
+
+MEDIAPIPE_NODE_IMPLEMENTATION(
+    WarpAffineCalculatorImpl<WarpAffineCalculatorCpu>);
+#if !MEDIAPIPE_DISABLE_GPU
+MEDIAPIPE_NODE_IMPLEMENTATION(
+    WarpAffineCalculatorImpl<WarpAffineCalculatorGpu>);
+#endif  // !MEDIAPIPE_DISABLE_GPU
+MEDIAPIPE_NODE_IMPLEMENTATION(WarpAffineCalculatorImpl<WarpAffineCalculator>);
+
+}  // namespace mediapipe

mediapipe/calculators/image/warp_affine_calculator.h

@@ -0,0 +1,94 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_IMAGE_WARP_AFFINE_CALCULATOR_H_
+#define MEDIAPIPE_CALCULATORS_IMAGE_WARP_AFFINE_CALCULATOR_H_
+
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/image_frame.h"
+
+#if !MEDIAPIPE_DISABLE_GPU
+#include "mediapipe/gpu/gpu_buffer.h"
+#endif  // !MEDIAPIPE_DISABLE_GPU
+
+namespace mediapipe {
+
+// Runs affine transformation.
+//
+// Input:
+//   IMAGE - Image/ImageFrame/GpuBuffer
+//
+//   MATRIX - std::array<float, 16>
+//     Used as following:
+//       output(x, y) = input(matrix[0] * x + matrix[1] * y + matrix[3],
+//                            matrix[4] * x + matrix[5] * y + matrix[7])
+//     where x and y ranges are defined by @OUTPUT_SIZE.
+//
+//   OUTPUT_SIZE - std::pair<int, int>
+//     Size of the output image.
+//
+// Output:
+//   IMAGE - Image/ImageFrame/GpuBuffer
+//
+//   Note:
+//   - Output image type and format are the same as the input one.
+//
+// Usage example:
+//   node {
+//     calculator: "WarpAffineCalculator(Cpu|Gpu)"
+//     input_stream: "IMAGE:image"
+//     input_stream: "MATRIX:matrix"
+//     input_stream: "OUTPUT_SIZE:size"
+//     output_stream: "IMAGE:transformed_image"
+//     options: {
+//       [mediapipe.WarpAffineCalculatorOptions.ext] {
+//         border_mode: BORDER_ZERO
+//       }
+//     }
+//   }
+template <typename ImageT>
+class WarpAffineCalculatorIntf : public mediapipe::api2::NodeIntf {
+ public:
+  static constexpr mediapipe::api2::Input<ImageT> kInImage{"IMAGE"};
+  static constexpr mediapipe::api2::Input<std::array<float, 16>> kMatrix{
+      "MATRIX"};
+  static constexpr mediapipe::api2::Input<std::pair<int, int>> kOutputSize{
+      "OUTPUT_SIZE"};
+  static constexpr mediapipe::api2::Output<ImageT> kOutImage{"IMAGE"};
+};
+
+class WarpAffineCalculatorCpu : public WarpAffineCalculatorIntf<ImageFrame> {
+ public:
+  MEDIAPIPE_NODE_INTERFACE(WarpAffineCalculatorCpu, kInImage, kMatrix,
+                           kOutputSize, kOutImage);
+};
+#if !MEDIAPIPE_DISABLE_GPU
+class WarpAffineCalculatorGpu
+    : public WarpAffineCalculatorIntf<mediapipe::GpuBuffer> {
+ public:
+  MEDIAPIPE_NODE_INTERFACE(WarpAffineCalculatorGpu, kInImage, kMatrix,
+                           kOutputSize, kOutImage);
+};
+#endif  // !MEDIAPIPE_DISABLE_GPU
+class WarpAffineCalculator : public WarpAffineCalculatorIntf<mediapipe::Image> {
+ public:
+  MEDIAPIPE_NODE_INTERFACE(WarpAffineCalculator, kInImage, kMatrix, kOutputSize,
+                           kOutImage);
+};
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_IMAGE_WARP_AFFINE_CALCULATOR_H_

mediapipe/calculators/image/warp_affine_calculator.proto

@@ -0,0 +1,46 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package mediapipe;
+
+import "mediapipe/framework/calculator.proto";
+import "mediapipe/gpu/gpu_origin.proto";
+
+message WarpAffineCalculatorOptions {
+  extend CalculatorOptions {
+    optional WarpAffineCalculatorOptions ext = 373693895;
+  }
+
+  // Pixel extrapolation methods. See @border_mode.
+  enum BorderMode {
+    BORDER_UNSPECIFIED = 0;
+    BORDER_ZERO = 1;
+    BORDER_REPLICATE = 2;
+  }
+
+  // Pixel extrapolation method.
+  // When converting image to tensor it may happen that tensor needs to read
+  // pixels outside image boundaries. Border mode helps to specify how such
+  // pixels will be calculated.
+  //
+  // BORDER_REPLICATE is used by default.
+  optional BorderMode border_mode = 1;
+
+  // For CONVENTIONAL mode for OpenGL, input image starts at bottom and needs
+  // to be flipped vertically as tensors are expected to start at top.
+  // (DEFAULT or unset interpreted as CONVENTIONAL.)
+  optional GpuOrigin.Mode gpu_origin = 2;
+}

mediapipe/calculators/image/warp_affine_calculator_test.cc

@@ -0,0 +1,615 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <cmath>
+#include <vector>
+
+#include "absl/flags/flag.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/substitute.h"
+#include "mediapipe/calculators/image/affine_transformation.h"
+#include "mediapipe/calculators/tensor/image_to_tensor_converter.h"
+#include "mediapipe/calculators/tensor/image_to_tensor_utils.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/calculator_runner.h"
+#include "mediapipe/framework/deps/file_path.h"
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/formats/image_format.pb.h"
+#include "mediapipe/framework/formats/image_frame.h"
+#include "mediapipe/framework/formats/image_frame_opencv.h"
+#include "mediapipe/framework/formats/rect.pb.h"
+#include "mediapipe/framework/formats/tensor.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/integral_types.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+#include "mediapipe/framework/port/opencv_imgcodecs_inc.h"
+#include "mediapipe/framework/port/opencv_imgproc_inc.h"
+#include "mediapipe/framework/port/parse_text_proto.h"
+#include "mediapipe/framework/port/status_matchers.h"
+
+namespace mediapipe {
+namespace {
+
+cv::Mat GetRgb(absl::string_view path) {
+  cv::Mat bgr = cv::imread(file::JoinPath("./", path));
+  cv::Mat rgb(bgr.rows, bgr.cols, CV_8UC3);
+  int from_to[] = {0, 2, 1, 1, 2, 0};
+  cv::mixChannels(&bgr, 1, &rgb, 1, from_to, 3);
+  return rgb;
+}
+
+cv::Mat GetRgba(absl::string_view path) {
+  cv::Mat bgr = cv::imread(file::JoinPath("./", path));
+  cv::Mat rgba(bgr.rows, bgr.cols, CV_8UC4, cv::Scalar(0, 0, 0, 0));
+  int from_to[] = {0, 2, 1, 1, 2, 0};
+  cv::mixChannels(&bgr, 1, &bgr, 1, from_to, 3);
+  return bgr;
+}
+
+// Test template.
+// No processing/assertions should be done after the function is invoked.
+void RunTest(const std::string& graph_text, const std::string& tag,
+             const cv::Mat& input, cv::Mat expected_result,
+             float similarity_threshold, std::array<float, 16> matrix,
+             int out_width, int out_height,
+             absl::optional<AffineTransformation::BorderMode> border_mode) {
+  std::string border_mode_str;
+  if (border_mode) {
+    switch (*border_mode) {
+      case AffineTransformation::BorderMode::kReplicate:
+        border_mode_str = "border_mode: BORDER_REPLICATE";
+        break;
+      case AffineTransformation::BorderMode::kZero:
+        border_mode_str = "border_mode: BORDER_ZERO";
+        break;
+    }
+  }
+  auto graph_config = mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(
+      absl::Substitute(graph_text, /*$0=*/border_mode_str));
+
+  std::vector<Packet> output_packets;
+  tool::AddVectorSink("output_image", &graph_config, &output_packets);
+
+  // Run the graph.
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  ImageFrame input_image(
+      input.channels() == 4 ? ImageFormat::SRGBA : ImageFormat::SRGB,
+      input.cols, input.rows, input.step, input.data, [](uint8*) {});
+  MP_ASSERT_OK(graph.AddPacketToInputStream(
+      "input_image",
+      MakePacket<ImageFrame>(std::move(input_image)).At(Timestamp(0))));
+  MP_ASSERT_OK(graph.AddPacketToInputStream(
+      "matrix",
+      MakePacket<std::array<float, 16>>(std::move(matrix)).At(Timestamp(0))));
+  MP_ASSERT_OK(graph.AddPacketToInputStream(
+      "output_size", MakePacket<std::pair<int, int>>(
+                         std::pair<int, int>(out_width, out_height))
+                         .At(Timestamp(0))));
+
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+  ASSERT_THAT(output_packets, testing::SizeIs(1));
+
+  // Get and process results.
+  const ImageFrame& out_frame = output_packets[0].Get<ImageFrame>();
+  cv::Mat result = formats::MatView(&out_frame);
+  double similarity =
+      1.0 - cv::norm(result, expected_result, cv::NORM_RELATIVE | cv::NORM_L2);
+  EXPECT_GE(similarity, similarity_threshold);
+
+  // Fully close graph at end, otherwise calculator+tensors are destroyed
+  // after calling WaitUntilDone().
+  MP_ASSERT_OK(graph.CloseInputStream("input_image"));
+  MP_ASSERT_OK(graph.CloseInputStream("matrix"));
+  MP_ASSERT_OK(graph.CloseInputStream("output_size"));
+  MP_ASSERT_OK(graph.WaitUntilDone());
+}
+
+enum class InputType { kImageFrame, kImage };
+
+// Similarity is checked against OpenCV results always, and due to differences
+// on how OpenCV and GL treats pixels there are two thresholds.
+// TODO: update to have just one threshold when OpenCV
+//                    implementation is updated.
+struct SimilarityConfig {
+  double threshold_on_cpu;
+  double threshold_on_gpu;
+};
+
+void RunTest(cv::Mat input, cv::Mat expected_result,
+             const SimilarityConfig& similarity, std::array<float, 16> matrix,
+             int out_width, int out_height,
+             absl::optional<AffineTransformation::BorderMode> border_mode) {
+  RunTest(R"(
+        input_stream: "input_image"
+        input_stream: "output_size"
+        input_stream: "matrix"
+        node {
+          calculator: "WarpAffineCalculatorCpu"
+          input_stream: "IMAGE:input_image"
+          input_stream: "MATRIX:matrix"
+          input_stream: "OUTPUT_SIZE:output_size"
+          output_stream: "IMAGE:output_image"
+          options {
+            [mediapipe.WarpAffineCalculatorOptions.ext] {
+              $0 # border mode
+            }
+          }
+        }
+        )",
+          "cpu", input, expected_result, similarity.threshold_on_cpu, matrix,
+          out_width, out_height, border_mode);
+
+  RunTest(R"(
+        input_stream: "input_image"
+        input_stream: "output_size"
+        input_stream: "matrix"
+        node {
+          calculator: "ToImageCalculator"
+          input_stream: "IMAGE_CPU:input_image"
+          output_stream: "IMAGE:input_image_unified"
+        }
+        node {
+          calculator: "WarpAffineCalculator"
+          input_stream: "IMAGE:input_image_unified"
+          input_stream: "MATRIX:matrix"
+          input_stream: "OUTPUT_SIZE:output_size"
+          output_stream: "IMAGE:output_image_unified"
+          options {
+            [mediapipe.WarpAffineCalculatorOptions.ext] {
+              $0 # border mode
+            }
+          }
+        }
+        node {
+          calculator: "FromImageCalculator"
+          input_stream: "IMAGE:output_image_unified"
+          output_stream: "IMAGE_CPU:output_image"
+        }
+        )",
+          "cpu_image", input, expected_result, similarity.threshold_on_cpu,
+          matrix, out_width, out_height, border_mode);
+
+  RunTest(R"(
+        input_stream: "input_image"
+        input_stream: "output_size"
+        input_stream: "matrix"
+        node {
+          calculator: "ImageFrameToGpuBufferCalculator"
+          input_stream: "input_image"
+          output_stream: "input_image_gpu"
+        }
+        node {
+          calculator: "WarpAffineCalculatorGpu"
+          input_stream: "IMAGE:input_image_gpu"
+          input_stream: "MATRIX:matrix"
+          input_stream: "OUTPUT_SIZE:output_size"
+          output_stream: "IMAGE:output_image_gpu"
+          options {
+            [mediapipe.WarpAffineCalculatorOptions.ext] {
+              $0 # border mode
+              gpu_origin: TOP_LEFT
+            }
+          }
+        }
+        node {
+          calculator: "GpuBufferToImageFrameCalculator"
+          input_stream: "output_image_gpu"
+          output_stream: "output_image"
+        }
+        )",
+          "gpu", input, expected_result, similarity.threshold_on_gpu, matrix,
+          out_width, out_height, border_mode);
+
+  RunTest(R"(
+        input_stream: "input_image"
+        input_stream: "output_size"
+        input_stream: "matrix"
+        node {
+          calculator: "ImageFrameToGpuBufferCalculator"
+          input_stream: "input_image"
+          output_stream: "input_image_gpu"
+        }
+        node {
+          calculator: "ToImageCalculator"
+          input_stream: "IMAGE_GPU:input_image_gpu"
+          output_stream: "IMAGE:input_image_unified"
+        }
+        node {
+          calculator: "WarpAffineCalculator"
+          input_stream: "IMAGE:input_image_unified"
+          input_stream: "MATRIX:matrix"
+          input_stream: "OUTPUT_SIZE:output_size"
+          output_stream: "IMAGE:output_image_unified"
+          options {
+            [mediapipe.WarpAffineCalculatorOptions.ext] {
+              $0 # border mode
+              gpu_origin: TOP_LEFT
+            }
+          }
+        }
+        node {
+          calculator: "FromImageCalculator"
+          input_stream: "IMAGE:output_image_unified"
+          output_stream: "IMAGE_GPU:output_image_gpu"
+        }
+        node {
+          calculator: "GpuBufferToImageFrameCalculator"
+          input_stream: "output_image_gpu"
+          output_stream: "output_image"
+        }
+        )",
+          "gpu_image", input, expected_result, similarity.threshold_on_gpu,
+          matrix, out_width, out_height, border_mode);
+}
+
+std::array<float, 16> GetMatrix(cv::Mat input, mediapipe::NormalizedRect roi,
+                                bool keep_aspect_ratio, int out_width,
+                                int out_height) {
+  std::array<float, 16> transform_mat;
+  mediapipe::RotatedRect roi_absolute =
+      mediapipe::GetRoi(input.cols, input.rows, roi);
+  mediapipe::PadRoi(out_width, out_height, keep_aspect_ratio, &roi_absolute)
+      .IgnoreError();
+  mediapipe::GetRotatedSubRectToRectTransformMatrix(
+      roi_absolute, input.cols, input.rows,
+      /*flip_horizontaly=*/false, &transform_mat);
+  return transform_mat;
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectKeepAspect) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/medium_sub_rect_keep_aspect.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode = {};
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.82},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectKeepAspectBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "medium_sub_rect_keep_aspect_border_zero.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.81},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectKeepAspectWithRotation) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(M_PI * 90.0f / 180.0f);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "medium_sub_rect_keep_aspect_with_rotation.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kReplicate;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.77},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectKeepAspectWithRotationBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(M_PI * 90.0f / 180.0f);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "medium_sub_rect_keep_aspect_with_rotation_border_zero.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.75},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectWithRotation) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(M_PI * -45.0f / 180.0f);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/medium_sub_rect_with_rotation.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = false;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kReplicate;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.81},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, MediumSubRectWithRotationBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.65f);
+  roi.set_y_center(0.4f);
+  roi.set_width(0.5f);
+  roi.set_height(0.5f);
+  roi.set_rotation(M_PI * -45.0f / 180.0f);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "medium_sub_rect_with_rotation_border_zero.png");
+  int out_width = 256;
+  int out_height = 256;
+  bool keep_aspect_ratio = false;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.80},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRect) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/large_sub_rect.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = false;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kReplicate;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.95},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRectBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/large_sub_rect_border_zero.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = false;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.92},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRectKeepAspect) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/large_sub_rect_keep_aspect.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kReplicate;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.97},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRectKeepAspectBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(0);
+  auto input = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgb(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "large_sub_rect_keep_aspect_border_zero.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.97},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRectKeepAspectWithRotation) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(M_PI * -15.0f / 180.0f);
+  auto input = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "large_sub_rect_keep_aspect_with_rotation.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode = {};
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.91},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, LargeSubRectKeepAspectWithRotationBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.5f);
+  roi.set_height(1.1f);
+  roi.set_rotation(M_PI * -15.0f / 180.0f);
+  auto input = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/"
+      "large_sub_rect_keep_aspect_with_rotation_border_zero.png");
+  int out_width = 128;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.88},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, NoOp) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.0f);
+  roi.set_height(1.0f);
+  roi.set_rotation(0);
+  auto input = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/noop_except_range.png");
+  int out_width = 64;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kReplicate;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.99},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+TEST(WarpAffineCalculatorTest, NoOpBorderZero) {
+  mediapipe::NormalizedRect roi;
+  roi.set_x_center(0.5f);
+  roi.set_y_center(0.5f);
+  roi.set_width(1.0f);
+  roi.set_height(1.0f);
+  roi.set_rotation(0);
+  auto input = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/input.jpg");
+  auto expected_output = GetRgba(
+      "/mediapipe/calculators/"
+      "tensor/testdata/image_to_tensor/noop_except_range.png");
+  int out_width = 64;
+  int out_height = 128;
+  bool keep_aspect_ratio = true;
+  std::optional<AffineTransformation::BorderMode> border_mode =
+      AffineTransformation::BorderMode::kZero;
+  RunTest(input, expected_output,
+          {.threshold_on_cpu = 0.99, .threshold_on_gpu = 0.99},
+          GetMatrix(input, roi, keep_aspect_ratio, out_width, out_height),
+          out_width, out_height, border_mode);
+}
+
+}  // namespace
+}  // namespace mediapipe

mediapipe/calculators/tensor/BUILD

@@ -26,6 +26,11 @@ licenses(["notice"])
 
 package(default_visibility = ["//visibility:private"])
 
+exports_files(
+    glob(["testdata/image_to_tensor/*"]),
+    visibility = ["//mediapipe/calculators/image:__subpackages__"],
+)
+
 selects.config_setting_group(
     name = "compute_shader_unavailable",
     match_any = [

mediapipe/calculators/tensor/image_to_tensor_calculator.cc

@@ -87,9 +87,9 @@ using GpuBuffer = mediapipe::GpuBuffer;
 //   TENSORS - std::vector<Tensor>
 //     Vector containing a single Tensor populated with an extrated RGB image.
 //   MATRIX - std::array<float, 16> @Optional
-//     An std::array<float, 16> representing a 4x4 row-major-order matrix which
+//     An std::array<float, 16> representing a 4x4 row-major-order matrix that
-//     can be used to map a point on the output tensor to a point on the input
+//     maps a point on the input image to a point on the output tensor, and
-//     image.
+//     can be used to reverse the mapping by inverting the matrix.
 //   LETTERBOX_PADDING - std::array<float, 4> @Optional
 //     An std::array<float, 4> representing the letterbox padding from the 4
 //     sides ([left, top, right, bottom]) of the output image, normalized to

mediapipe/calculators/tensor/tensor_converter_calculator.cc

@@ -517,8 +517,8 @@ absl::Status TensorConverterCalculator::InitGpu(CalculatorContext* cc) {
           uniform sampler2D frame;
 
           void main() {
-            $1  // flip
+            vec2 coord = $1
-            vec4 pixel = texture2D(frame, sample_coordinate);
+            vec4 pixel = texture2D(frame, coord);
             $2  // normalize [-1,1]
             fragColor.r = pixel.r;  // r channel
             $3  // g & b channels
@@ -526,8 +526,9 @@ absl::Status TensorConverterCalculator::InitGpu(CalculatorContext* cc) {
           })",
         /*$0=*/single_channel ? "vec1" : "vec4",
         /*$1=*/
-        flip_vertically_ ? "sample_coordinate.y = 1.0 - sample_coordinate.y;"
+        flip_vertically_
-                         : "",
+            ? "vec2(sample_coordinate.x, 1.0 - sample_coordinate.y);"
+            : "sample_coordinate;",
         /*$2=*/output_range_.has_value()
             ? absl::Substitute("pixel = pixel * float($0) + float($1);",
                                (output_range_->second - output_range_->first),

mediapipe/calculators/tensorflow/BUILD

@@ -587,9 +587,21 @@ cc_library(
         "//mediapipe/framework/port:ret_check",
     ] + select({
         "//conditions:default": [
-            "//mediapipe/framework/port:file_helpers",
         ],
-    }),
+        "//mediapipe:android": [],
+    }) + select(
+        {
+            "//conditions:default": [
+            ],
+        },
+    ) + select(
+        {
+            "//conditions:default": [
+            ],
+            "//mediapipe:android": [
+            ],
+        },
+    ),
     alwayslink = 1,
 )
 

mediapipe/calculators/tensorflow/pack_media_sequence_calculator.cc

@@ -37,6 +37,7 @@ const char kSequenceExampleTag[] = "SEQUENCE_EXAMPLE";
 const char kImageTag[] = "IMAGE";
 const char kFloatContextFeaturePrefixTag[] = "FLOAT_CONTEXT_FEATURE_";
 const char kFloatFeaturePrefixTag[] = "FLOAT_FEATURE_";
+const char kBytesFeaturePrefixTag[] = "BYTES_FEATURE_";
 const char kForwardFlowEncodedTag[] = "FORWARD_FLOW_ENCODED";
 const char kBBoxTag[] = "BBOX";
 const char kKeypointsTag[] = "KEYPOINTS";
@@ -153,6 +154,9 @@ class PackMediaSequenceCalculator : public CalculatorBase {
       if (absl::StartsWith(tag, kFloatFeaturePrefixTag)) {
         cc->Inputs().Tag(tag).Set<std::vector<float>>();
       }
+      if (absl::StartsWith(tag, kBytesFeaturePrefixTag)) {
+        cc->Inputs().Tag(tag).Set<std::vector<std::string>>();
+      }
     }
 
     CHECK(cc->Outputs().HasTag(kSequenceExampleTag) ||
@@ -231,6 +235,13 @@ class PackMediaSequenceCalculator : public CalculatorBase {
           mpms::ClearFeatureFloats(key, sequence_.get());
           mpms::ClearFeatureTimestamp(key, sequence_.get());
         }
+        if (absl::StartsWith(tag, kBytesFeaturePrefixTag)) {
+          std::string key = tag.substr(sizeof(kBytesFeaturePrefixTag) /
+                                           sizeof(*kBytesFeaturePrefixTag) -
+                                       1);
+          mpms::ClearFeatureBytes(key, sequence_.get());
+          mpms::ClearFeatureTimestamp(key, sequence_.get());
+        }
         if (absl::StartsWith(tag, kKeypointsTag)) {
           std::string key =
               tag.substr(sizeof(kKeypointsTag) / sizeof(*kKeypointsTag) - 1);
@@ -405,6 +416,17 @@ class PackMediaSequenceCalculator : public CalculatorBase {
                                cc->Inputs().Tag(tag).Get<std::vector<float>>(),
                                sequence_.get());
       }
+      if (absl::StartsWith(tag, kBytesFeaturePrefixTag) &&
+          !cc->Inputs().Tag(tag).IsEmpty()) {
+        std::string key = tag.substr(sizeof(kBytesFeaturePrefixTag) /
+                                         sizeof(*kBytesFeaturePrefixTag) -
+                                     1);
+        mpms::AddFeatureTimestamp(key, cc->InputTimestamp().Value(),
+                                  sequence_.get());
+        mpms::AddFeatureBytes(
+            key, cc->Inputs().Tag(tag).Get<std::vector<std::string>>(),
+            sequence_.get());
+      }
       if (absl::StartsWith(tag, kBBoxTag) && !cc->Inputs().Tag(tag).IsEmpty()) {
         std::string key = "";
         if (tag != kBBoxTag) {

mediapipe/calculators/tensorflow/pack_media_sequence_calculator_test.cc

@@ -49,6 +49,8 @@ constexpr char kKeypointsTestTag[] = "KEYPOINTS_TEST";
 constexpr char kBboxPredictedTag[] = "BBOX_PREDICTED";
 constexpr char kAudioOtherTag[] = "AUDIO_OTHER";
 constexpr char kAudioTestTag[] = "AUDIO_TEST";
+constexpr char kBytesFeatureOtherTag[] = "BYTES_FEATURE_OTHER";
+constexpr char kBytesFeatureTestTag[] = "BYTES_FEATURE_TEST";
 constexpr char kForwardFlowEncodedTag[] = "FORWARD_FLOW_ENCODED";
 constexpr char kFloatContextFeatureOtherTag[] = "FLOAT_CONTEXT_FEATURE_OTHER";
 constexpr char kFloatContextFeatureTestTag[] = "FLOAT_CONTEXT_FEATURE_TEST";
@@ -215,6 +217,54 @@ TEST_F(PackMediaSequenceCalculatorTest, PacksTwoFloatLists) {
   }
 }
 
+TEST_F(PackMediaSequenceCalculatorTest, PacksTwoBytesLists) {
+  SetUpCalculator({"BYTES_FEATURE_TEST:test", "BYTES_FEATURE_OTHER:test2"}, {},
+                  false, true);
+  auto input_sequence = ::absl::make_unique<tf::SequenceExample>();
+
+  int num_timesteps = 2;
+  for (int i = 0; i < num_timesteps; ++i) {
+    auto vs_ptr = ::absl::make_unique<std::vector<std::string>>(
+        2, absl::StrCat("foo", 2 << i));
+    runner_->MutableInputs()
+        ->Tag(kBytesFeatureTestTag)
+        .packets.push_back(Adopt(vs_ptr.release()).At(Timestamp(i)));
+    vs_ptr = ::absl::make_unique<std::vector<std::string>>(
+        2, absl::StrCat("bar", 2 << i));
+    runner_->MutableInputs()
+        ->Tag(kBytesFeatureOtherTag)
+        .packets.push_back(Adopt(vs_ptr.release()).At(Timestamp(i)));
+  }
+
+  runner_->MutableSidePackets()->Tag(kSequenceExampleTag) =
+      Adopt(input_sequence.release());
+
+  MP_ASSERT_OK(runner_->Run());
+
+  const std::vector<Packet>& output_packets =
+      runner_->Outputs().Tag(kSequenceExampleTag).packets;
+  ASSERT_EQ(1, output_packets.size());
+  const tf::SequenceExample& output_sequence =
+      output_packets[0].Get<tf::SequenceExample>();
+
+  ASSERT_EQ(num_timesteps,
+            mpms::GetFeatureTimestampSize("TEST", output_sequence));
+  ASSERT_EQ(num_timesteps, mpms::GetFeatureBytesSize("TEST", output_sequence));
+  ASSERT_EQ(num_timesteps,
+            mpms::GetFeatureTimestampSize("OTHER", output_sequence));
+  ASSERT_EQ(num_timesteps, mpms::GetFeatureBytesSize("OTHER", output_sequence));
+  for (int i = 0; i < num_timesteps; ++i) {
+    ASSERT_EQ(i, mpms::GetFeatureTimestampAt("TEST", output_sequence, i));
+    ASSERT_THAT(mpms::GetFeatureBytesAt("TEST", output_sequence, i),
+                ::testing::ElementsAreArray(
+                    std::vector<std::string>(2, absl::StrCat("foo", 2 << i))));
+    ASSERT_EQ(i, mpms::GetFeatureTimestampAt("OTHER", output_sequence, i));
+    ASSERT_THAT(mpms::GetFeatureBytesAt("OTHER", output_sequence, i),
+                ::testing::ElementsAreArray(
+                    std::vector<std::string>(2, absl::StrCat("bar", 2 << i))));
+  }
+}
+
 TEST_F(PackMediaSequenceCalculatorTest, OutputAsZeroTimestamp) {
   SetUpCalculator({"FLOAT_FEATURE_TEST:test"}, {}, false, true, true);
   auto input_sequence = ::absl::make_unique<tf::SequenceExample>();
@@ -829,6 +879,45 @@ TEST_F(PackMediaSequenceCalculatorTest, TestReplacingFloatVectors) {
   ASSERT_EQ(0, mpms::GetFeatureFloatsSize("OTHER", output_sequence));
 }
 
+TEST_F(PackMediaSequenceCalculatorTest, TestReplacingBytesVectors) {
+  SetUpCalculator({"BYTES_FEATURE_TEST:test", "BYTES_FEATURE_OTHER:test2"}, {},
+                  false, true);
+  auto input_sequence = ::absl::make_unique<tf::SequenceExample>();
+
+  int num_timesteps = 2;
+  for (int i = 0; i < num_timesteps; ++i) {
+    auto vs_ptr = ::absl::make_unique<std::vector<std::string>>(
+        2, absl::StrCat("foo", 2 << i));
+    mpms::AddFeatureBytes("TEST", *vs_ptr, input_sequence.get());
+    mpms::AddFeatureTimestamp("TEST", i, input_sequence.get());
+    vs_ptr = ::absl::make_unique<std::vector<std::string>>(
+        2, absl::StrCat("bar", 2 << i));
+    mpms::AddFeatureBytes("OTHER", *vs_ptr, input_sequence.get());
+    mpms::AddFeatureTimestamp("OTHER", i, input_sequence.get());
+  }
+  ASSERT_EQ(num_timesteps,
+            mpms::GetFeatureTimestampSize("TEST", *input_sequence));
+  ASSERT_EQ(num_timesteps, mpms::GetFeatureBytesSize("TEST", *input_sequence));
+  ASSERT_EQ(num_timesteps,
+            mpms::GetFeatureTimestampSize("OTHER", *input_sequence));
+  ASSERT_EQ(num_timesteps, mpms::GetFeatureBytesSize("OTHER", *input_sequence));
+  runner_->MutableSidePackets()->Tag(kSequenceExampleTag) =
+      Adopt(input_sequence.release());
+
+  MP_ASSERT_OK(runner_->Run());
+
+  const std::vector<Packet>& output_packets =
+      runner_->Outputs().Tag(kSequenceExampleTag).packets;
+  ASSERT_EQ(1, output_packets.size());
+  const tf::SequenceExample& output_sequence =
+      output_packets[0].Get<tf::SequenceExample>();
+
+  ASSERT_EQ(0, mpms::GetFeatureTimestampSize("TEST", output_sequence));
+  ASSERT_EQ(0, mpms::GetFeatureFloatsSize("TEST", output_sequence));
+  ASSERT_EQ(0, mpms::GetFeatureTimestampSize("OTHER", output_sequence));
+  ASSERT_EQ(0, mpms::GetFeatureFloatsSize("OTHER", output_sequence));
+}
+
 TEST_F(PackMediaSequenceCalculatorTest, TestReconcilingAnnotations) {
   SetUpCalculator({"IMAGE:images"}, {}, false, true);
   auto input_sequence = ::absl::make_unique<tf::SequenceExample>();

mediapipe/calculators/tflite/BUILD

@@ -162,6 +162,27 @@ selects.config_setting_group(
     ],
 )
 
+config_setting(
+    name = "edge_tpu_usb",
+    define_values = {
+        "MEDIAPIPE_EDGE_TPU": "usb",
+    },
+)
+
+config_setting(
+    name = "edge_tpu_pci",
+    define_values = {
+        "MEDIAPIPE_EDGE_TPU": "pci",
+    },
+)
+
+config_setting(
+    name = "edge_tpu_all",
+    define_values = {
+        "MEDIAPIPE_EDGE_TPU": "all",
+    },
+)
+
 cc_library(
     name = "tflite_inference_calculator",
     srcs = ["tflite_inference_calculator.cc"],
@@ -172,6 +193,12 @@ cc_library(
         ],
         "//conditions:default": [],
     }),
+    defines = select({
+        "//conditions:default": [],
+        ":edge_tpu_usb": ["MEDIAPIPE_EDGE_TPU=usb"],
+        ":edge_tpu_pci": ["MEDIAPIPE_EDGE_TPU=pci"],
+        ":edge_tpu_all": ["MEDIAPIPE_EDGE_TPU=all"],
+    }),
     linkopts = select({
         "//mediapipe:ios": [
             "-framework CoreVideo",
@@ -223,6 +250,20 @@ cc_library(
         "//conditions:default": [
             "//mediapipe/util:cpu_util",
         ],
+    }) + select({
+        "//conditions:default": [],
+        ":edge_tpu_usb": [
+            "@libedgetpu//tflite/public:edgetpu",
+            "@libedgetpu//tflite/public:oss_edgetpu_direct_usb",
+        ],
+        ":edge_tpu_pci": [
+            "@libedgetpu//tflite/public:edgetpu",
+            "@libedgetpu//tflite/public:oss_edgetpu_direct_pci",
+        ],
+        ":edge_tpu_all": [
+            "@libedgetpu//tflite/public:edgetpu",
+            "@libedgetpu//tflite/public:oss_edgetpu_direct_all",
+        ],
     }),
     alwayslink = 1,
 )

mediapipe/calculators/tflite/tflite_inference_calculator.cc

@@ -85,7 +85,22 @@ constexpr char kTensorsGpuTag[] = "TENSORS_GPU";
 }  // namespace
 
 #if defined(MEDIAPIPE_EDGE_TPU)
-#include "edgetpu.h"
+#include "tflite/public/edgetpu.h"
+
+// Checkes whether model contains Edge TPU custom op or not.
+bool ContainsEdgeTpuCustomOp(const tflite::FlatBufferModel& model) {
+  const auto* opcodes = model.GetModel()->operator_codes();
+  for (const auto* subgraph : *model.GetModel()->subgraphs()) {
+    for (const auto* op : *subgraph->operators()) {
+      const auto* opcode = opcodes->Get(op->opcode_index());
+      if (opcode->custom_code() &&
+          opcode->custom_code()->str() == edgetpu::kCustomOp) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
 
 // Creates and returns an Edge TPU interpreter to run the given edgetpu model.
 std::unique_ptr<tflite::Interpreter> BuildEdgeTpuInterpreter(
@@ -94,14 +109,9 @@ std::unique_ptr<tflite::Interpreter> BuildEdgeTpuInterpreter(
     edgetpu::EdgeTpuContext* edgetpu_context) {
   resolver->AddCustom(edgetpu::kCustomOp, edgetpu::RegisterCustomOp());
   std::unique_ptr<tflite::Interpreter> interpreter;
-  if (tflite::InterpreterBuilder(model, *resolver)(&interpreter) != kTfLiteOk) {
+  CHECK_EQ(tflite::InterpreterBuilder(model, *resolver)(&interpreter),
-    std::cerr << "Failed to build edge TPU interpreter." << std::endl;
+           kTfLiteOk);
-  }
   interpreter->SetExternalContext(kTfLiteEdgeTpuContext, edgetpu_context);
-  interpreter->SetNumThreads(1);
-  if (interpreter->AllocateTensors() != kTfLiteOk) {
-    std::cerr << "Failed to allocate edge TPU tensors." << std::endl;
-  }
   return interpreter;
 }
 #endif  // MEDIAPIPE_EDGE_TPU
@@ -279,8 +289,7 @@ class TfLiteInferenceCalculator : public CalculatorBase {
 #endif  // MEDIAPIPE_TFLITE_GL_INFERENCE
 
 #if defined(MEDIAPIPE_EDGE_TPU)
-  std::shared_ptr<edgetpu::EdgeTpuContext> edgetpu_context_ =
+  std::shared_ptr<edgetpu::EdgeTpuContext> edgetpu_context_;
-      edgetpu::EdgeTpuManager::GetSingleton()->OpenDevice();
 #endif
 
   bool gpu_inference_ = false;
@@ -303,6 +312,10 @@ REGISTER_CALCULATOR(TfLiteInferenceCalculator);
 // Calculator Core Section
 
 namespace {
+
+constexpr char kCustomOpResolverTag[] = "CUSTOM_OP_RESOLVER";
+constexpr char kModelTag[] = "MODEL";
+
 template <class CC>
 bool ShouldUseGpu(CC* cc) {
 #if MEDIAPIPE_TFLITE_GPU_SUPPORTED
@@ -327,7 +340,7 @@ absl::Status TfLiteInferenceCalculator::GetContract(CalculatorContract* cc) {
   const auto& options =
       cc->Options<::mediapipe::TfLiteInferenceCalculatorOptions>();
   RET_CHECK(!options.model_path().empty() ^
-            cc->InputSidePackets().HasTag("MODEL"))
+            cc->InputSidePackets().HasTag(kModelTag))
       << "Either model as side packet or model path in options is required.";
 
   if (cc->Inputs().HasTag(kTensorsTag))
@@ -340,13 +353,13 @@ absl::Status TfLiteInferenceCalculator::GetContract(CalculatorContract* cc) {
   if (cc->Outputs().HasTag(kTensorsGpuTag))
     cc->Outputs().Tag(kTensorsGpuTag).Set<std::vector<GpuTensor>>();
 
-  if (cc->InputSidePackets().HasTag("CUSTOM_OP_RESOLVER")) {
+  if (cc->InputSidePackets().HasTag(kCustomOpResolverTag)) {
     cc->InputSidePackets()
-        .Tag("CUSTOM_OP_RESOLVER")
+        .Tag(kCustomOpResolverTag)
         .Set<tflite::ops::builtin::BuiltinOpResolver>();
   }
-  if (cc->InputSidePackets().HasTag("MODEL")) {
+  if (cc->InputSidePackets().HasTag(kModelTag)) {
-    cc->InputSidePackets().Tag("MODEL").Set<TfLiteModelPtr>();
+    cc->InputSidePackets().Tag(kModelTag).Set<TfLiteModelPtr>();
   }
 
   if (ShouldUseGpu(cc)) {
@@ -486,8 +499,8 @@ absl::Status TfLiteInferenceCalculator::Close(CalculatorContext* cc) {
   MP_RETURN_IF_ERROR(WriteKernelsToFile());
 
   return RunInContextIfNeeded([this]() -> absl::Status {
-    if (delegate_) {
     interpreter_ = nullptr;
+    if (delegate_) {
       delegate_ = nullptr;
 #if MEDIAPIPE_TFLITE_GPU_SUPPORTED
       if (gpu_inference_) {
@@ -501,7 +514,7 @@ absl::Status TfLiteInferenceCalculator::Close(CalculatorContext* cc) {
 #endif  // MEDIAPIPE_TFLITE_GPU_SUPPORTED
     }
 #if defined(MEDIAPIPE_EDGE_TPU)
-    edgetpu_context_.reset();
+    edgetpu_context_ = nullptr;
 #endif
     return absl::OkStatus();
   });
@@ -723,9 +736,9 @@ absl::Status TfLiteInferenceCalculator::InitTFLiteGPURunner(
   auto op_resolver_ptr =
       static_cast<const tflite::ops::builtin::BuiltinOpResolver*>(
           &default_op_resolver);
-  if (cc->InputSidePackets().HasTag("CUSTOM_OP_RESOLVER")) {
+  if (cc->InputSidePackets().HasTag(kCustomOpResolverTag)) {
     op_resolver_ptr = &(cc->InputSidePackets()
-                            .Tag("CUSTOM_OP_RESOLVER")
+                            .Tag(kCustomOpResolverTag)
                             .Get<tflite::ops::builtin::BuiltinOpResolver>());
   }
 
@@ -825,21 +838,26 @@ absl::Status TfLiteInferenceCalculator::LoadModel(CalculatorContext* cc) {
 
   tflite::ops::builtin::BuiltinOpResolverWithoutDefaultDelegates
       default_op_resolver;
+#if defined(MEDIAPIPE_EDGE_TPU)
+  if (ContainsEdgeTpuCustomOp(model)) {
+    edgetpu_context_ = edgetpu::EdgeTpuManager::GetSingleton()->OpenDevice();
+    interpreter_ = BuildEdgeTpuInterpreter(model, &default_op_resolver,
+                                           edgetpu_context_.get());
+  } else {
+#endif  // MEDIAPIPE_EDGE_TPU
     auto op_resolver_ptr =
         static_cast<const tflite::ops::builtin::BuiltinOpResolver*>(
             &default_op_resolver);
 
-  if (cc->InputSidePackets().HasTag("CUSTOM_OP_RESOLVER")) {
+    if (cc->InputSidePackets().HasTag(kCustomOpResolverTag)) {
       op_resolver_ptr = &(cc->InputSidePackets()
-                            .Tag("CUSTOM_OP_RESOLVER")
+                              .Tag(kCustomOpResolverTag)
                               .Get<tflite::ops::builtin::BuiltinOpResolver>());
     }
 
-#if defined(MEDIAPIPE_EDGE_TPU)
-  interpreter_ =
-      BuildEdgeTpuInterpreter(model, op_resolver_ptr, edgetpu_context_.get());
-#else
     tflite::InterpreterBuilder(model, *op_resolver_ptr)(&interpreter_);
+#if defined(MEDIAPIPE_EDGE_TPU)
+  }
 #endif  // MEDIAPIPE_EDGE_TPU
 
   RET_CHECK(interpreter_);
@@ -872,8 +890,8 @@ absl::StatusOr<Packet> TfLiteInferenceCalculator::GetModelAsPacket(
   if (!options.model_path().empty()) {
     return TfLiteModelLoader::LoadFromPath(options.model_path());
   }
-  if (cc.InputSidePackets().HasTag("MODEL")) {
+  if (cc.InputSidePackets().HasTag(kModelTag)) {
-    return cc.InputSidePackets().Tag("MODEL");
+    return cc.InputSidePackets().Tag(kModelTag);
   }
   return absl::Status(absl::StatusCode::kNotFound,
                       "Must specify TFLite model as path or loaded model.");
@@ -929,6 +947,8 @@ absl::Status TfLiteInferenceCalculator::LoadDelegate(CalculatorContext* cc) {
                    kTfLiteOk);
       return absl::OkStatus();
     }
+#else
+    (void)use_xnnpack;
 #endif  // !EDGETPU
 
     // Return and use default tflite infernece (on CPU). No need for GPU

mediapipe/calculators/util/BUILD

@@ -1353,3 +1353,34 @@ cc_test(
         "//mediapipe/framework/port:gtest_main",
     ],
 )
+
+cc_library(
+    name = "inverse_matrix_calculator",
+    srcs = ["inverse_matrix_calculator.cc"],
+    hdrs = ["inverse_matrix_calculator.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:port",
+        "@com_google_absl//absl/status",
+        "@eigen_archive//:eigen3",
+    ],
+    alwayslink = True,
+)
+
+cc_test(
+    name = "inverse_matrix_calculator_test",
+    srcs = ["inverse_matrix_calculator_test.cc"],
+    tags = ["desktop_only_test"],
+    deps = [
+        ":inverse_matrix_calculator",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework:calculator_runner",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/framework/port:integral_types",
+        "//mediapipe/framework/port:parse_text_proto",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/strings",
+    ],
+)

mediapipe/calculators/util/from_image_calculator.cc

@@ -33,6 +33,7 @@ namespace {
 constexpr char kImageFrameTag[] = "IMAGE_CPU";
 constexpr char kGpuBufferTag[] = "IMAGE_GPU";
 constexpr char kImageTag[] = "IMAGE";
+constexpr char kSourceOnGpuTag[] = "SOURCE_ON_GPU";
 }  // namespace
 
 // A calculator for converting the unified image container into
@@ -46,6 +47,8 @@ constexpr char kImageTag[] = "IMAGE";
 //   IMAGE_CPU:  An ImageFrame containing output image.
 //   IMAGE_GPU:  A GpuBuffer containing output image.
 //
+//   SOURCE_ON_GPU: The source Image is stored on GPU or CPU.
+//
 // Note:
 //   Data is automatically transferred to/from the CPU or GPU
 //   depending on output type.
@@ -66,6 +69,7 @@ class FromImageCalculator : public CalculatorBase {
   absl::Status RenderGpu(CalculatorContext* cc);
   absl::Status RenderCpu(CalculatorContext* cc);
 
+  bool check_image_source_ = false;
   bool gpu_output_ = false;
   bool gpu_initialized_ = false;
 #if !MEDIAPIPE_DISABLE_GPU
@@ -102,6 +106,9 @@ absl::Status FromImageCalculator::GetContract(CalculatorContract* cc) {
 #endif  // !MEDIAPIPE_DISABLE_GPU
   }
 
+  if (cc->Outputs().HasTag(kSourceOnGpuTag)) {
+    cc->Outputs().Tag(kSourceOnGpuTag).Set<bool>();
+  }
   return absl::OkStatus();
 }
 
@@ -111,7 +118,9 @@ absl::Status FromImageCalculator::Open(CalculatorContext* cc) {
   if (cc->Outputs().HasTag(kGpuBufferTag)) {
     gpu_output_ = true;
   }
-
+  if (cc->Outputs().HasTag(kSourceOnGpuTag)) {
+    check_image_source_ = true;
+  }
   if (gpu_output_) {
 #if !MEDIAPIPE_DISABLE_GPU
     MP_RETURN_IF_ERROR(gpu_helper_.Open(cc));
@@ -122,6 +131,13 @@ absl::Status FromImageCalculator::Open(CalculatorContext* cc) {
 }
 
 absl::Status FromImageCalculator::Process(CalculatorContext* cc) {
+  if (check_image_source_) {
+    auto& input = cc->Inputs().Tag(kImageTag).Get<mediapipe::Image>();
+    cc->Outputs()
+        .Tag(kSourceOnGpuTag)
+        .AddPacket(MakePacket<bool>(input.UsesGpu()).At(cc->InputTimestamp()));
+  }
+
   if (gpu_output_) {
 #if !MEDIAPIPE_DISABLE_GPU
     MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext([&cc]() -> absl::Status {

mediapipe/calculators/util/inverse_matrix_calculator.cc

@@ -0,0 +1,50 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/util/inverse_matrix_calculator.h"
+
+#include "Eigen/Core"
+#include "Eigen/Geometry"
+#include "Eigen/LU"
+#include "absl/status/status.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/calculator_framework.h"
+
+namespace mediapipe {
+namespace api2 {
+
+class InverseMatrixCalculatorImpl : public NodeImpl<InverseMatrixCalculator> {
+  absl::Status Process(mediapipe::CalculatorContext* cc) override {
+    if (kInputMatrix(cc).IsEmpty()) {
+      return absl::OkStatus();
+    }
+    Eigen::Matrix<float, 4, 4, Eigen::RowMajor> matrix(
+        kInputMatrix(cc).Get().data());
+
+    Eigen::Matrix<float, 4, 4, Eigen::RowMajor> inverse_matrix;
+    bool inverse_check;
+    matrix.computeInverseWithCheck(inverse_matrix, inverse_check);
+    RET_CHECK(inverse_check) << "Inverse matrix cannot be calculated.";
+
+    std::array<float, 16> output;
+    Eigen::Map<Eigen::Matrix<float, 4, 4, Eigen::RowMajor>>(
+        output.data(), 4, 4) = inverse_matrix.matrix();
+    kOutputMatrix(cc).Send(std::move(output));
+    return absl::OkStatus();
+  }
+};
+MEDIAPIPE_NODE_IMPLEMENTATION(InverseMatrixCalculatorImpl);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/util/inverse_matrix_calculator.h

@@ -0,0 +1,51 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_UTIL_INVERSE_MATRIX_CALCULATOR_H_
+#define MEDIAPIPE_CALCULATORS_UTIL_INVERSE_MATRIX_CALCULATOR_H_
+
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/port.h"
+
+namespace mediapipe {
+
+// Runs affine transformation.
+//
+// Input:
+//   MATRIX - std::array<float, 16>
+//     Row major 4x4 matrix to inverse.
+//
+// Output:
+//   MATRIX - std::array<float, 16>
+//     Row major 4x4 inversed matrix.
+//
+// Usage example:
+//   node {
+//     calculator: "dishti.aimatter.InverseMatrixCalculator"
+//     input_stream: "MATRIX:input_matrix"
+//     output_stream: "MATRIX:output_matrix"
+//   }
+class InverseMatrixCalculator : public mediapipe::api2::NodeIntf {
+ public:
+  static constexpr mediapipe::api2::Input<std::array<float, 16>> kInputMatrix{
+      "MATRIX"};
+  static constexpr mediapipe::api2::Output<std::array<float, 16>> kOutputMatrix{
+      "MATRIX"};
+  MEDIAPIPE_NODE_INTERFACE(InverseMatrixCalculator, kInputMatrix,
+                           kOutputMatrix);
+};
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_UTIL_INVERSE_MATRIX_CALCULATOR_H_

mediapipe/calculators/util/inverse_matrix_calculator_test.cc

@@ -0,0 +1,126 @@
+#include "mediapipe/calculators/util/inverse_matrix_calculator.h"
+
+#include <array>
+
+#include "absl/memory/memory.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/calculator_runner.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/integral_types.h"
+#include "mediapipe/framework/port/parse_text_proto.h"
+#include "mediapipe/framework/port/status_matchers.h"
+
+namespace mediapipe {
+namespace {
+
+void RunTest(const std::array<float, 16>& matrix,
+             const std::array<float, 16>& expected_inverse_matrix) {
+  auto graph_config = mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(
+      R"pb(
+        input_stream: "matrix"
+        node {
+          calculator: "InverseMatrixCalculator"
+          input_stream: "MATRIX:matrix"
+          output_stream: "MATRIX:inverse_matrix"
+        }
+      )pb");
+
+  std::vector<Packet> output_packets;
+  tool::AddVectorSink("inverse_matrix", &graph_config, &output_packets);
+
+  // Run the graph.
+  CalculatorGraph graph;
+  MP_ASSERT_OK(graph.Initialize(graph_config));
+  MP_ASSERT_OK(graph.StartRun({}));
+
+  MP_ASSERT_OK(graph.AddPacketToInputStream(
+      "matrix",
+      MakePacket<std::array<float, 16>>(std::move(matrix)).At(Timestamp(0))));
+
+  MP_ASSERT_OK(graph.WaitUntilIdle());
+  ASSERT_THAT(output_packets, testing::SizeIs(1));
+
+  const auto& inverse_matrix = output_packets[0].Get<std::array<float, 16>>();
+
+  EXPECT_THAT(inverse_matrix, testing::Eq(expected_inverse_matrix));
+
+  // Fully close graph at end, otherwise calculator+tensors are destroyed
+  // after calling WaitUntilDone().
+  MP_ASSERT_OK(graph.CloseInputStream("matrix"));
+  MP_ASSERT_OK(graph.WaitUntilDone());
+}
+
+TEST(InverseMatrixCalculatorTest, Identity) {
+  // clang-format off
+  std::array<float, 16> matrix = {
+    1.0f, 0.0f, 0.0f, 0.0f,
+    0.0f, 1.0f, 0.0f, 0.0f,
+    0.0f, 0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 0.0f, 1.0f,
+  };
+  std::array<float, 16> expected_inverse_matrix = {
+    1.0f, 0.0f, 0.0f, 0.0f,
+    0.0f, 1.0f, 0.0f, 0.0f,
+    0.0f, 0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 0.0f, 1.0f,
+  };
+  // clang-format on
+  RunTest(matrix, expected_inverse_matrix);
+}
+
+TEST(InverseMatrixCalculatorTest, Translation) {
+  // clang-format off
+  std::array<float, 16> matrix = {
+    1.0f, 0.0f, 0.0f,  2.0f,
+    0.0f, 1.0f, 0.0f, -5.0f,
+    0.0f, 0.0f, 1.0f,  0.0f,
+    0.0f, 0.0f, 0.0f,  1.0f,
+  };
+  std::array<float, 16> expected_inverse_matrix = {
+    1.0f, 0.0f, 0.0f, -2.0f,
+    0.0f, 1.0f, 0.0f,  5.0f,
+    0.0f, 0.0f, 1.0f,  0.0f,
+    0.0f, 0.0f, 0.0f,  1.0f,
+  };
+  // clang-format on
+  RunTest(matrix, expected_inverse_matrix);
+}
+
+TEST(InverseMatrixCalculatorTest, Scale) {
+  // clang-format off
+  std::array<float, 16> matrix = {
+    5.0f, 0.0f, 0.0f, 0.0f,
+    0.0f, 2.0f, 0.0f, 0.0f,
+    0.0f, 0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 0.0f, 1.0f,
+  };
+  std::array<float, 16> expected_inverse_matrix = {
+    0.2f, 0.0f, 0.0f, 0.0f,
+    0.0f, 0.5f, 0.0f, 0.0f,
+    0.0f, 0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 0.0f, 1.0f,
+  };
+  // clang-format on
+  RunTest(matrix, expected_inverse_matrix);
+}
+
+TEST(InverseMatrixCalculatorTest, Rotation90) {
+  // clang-format off
+  std::array<float, 16> matrix = {
+    0.0f, -1.0f, 0.0f, 0.0f,
+    1.0f,  0.0f, 0.0f, 0.0f,
+    0.0f,  0.0f, 1.0f, 0.0f,
+    0.0f,  0.0f, 0.0f, 1.0f,
+  };
+  std::array<float, 16> expected_inverse_matrix = {
+     0.0f, 1.0f, 0.0f, 0.0f,
+    -1.0f, 0.0f, 0.0f, 0.0f,
+     0.0f, 0.0f, 1.0f, 0.0f,
+     0.0f, 0.0f, 0.0f, 1.0f,
+  };
+  // clang-format on
+  RunTest(matrix, expected_inverse_matrix);
+}
+
+}  // namespace
+}  // namespace mediapipe

mediapipe/examples/android/solutions/create_win_symlinks.bat

@@ -0,0 +1,16 @@
+@rem Remove the current res dir symlinks that are for Linux and macOS and recreate res dir symlinks for Windows.
+@rem This script needs administrator permission. Must run this script as administrator.
+
+@rem for hands example app.
+cd /d %~dp0
+cd hands\src\main
+rm res
+mklink /d res ..\..\..\res
+
+@rem for facemesh example app.
+cd /d %~dp0
+cd facemesh\src\main
+rm res
+mklink /d res ..\..\..\res
+dir
+pause

mediapipe/examples/android/solutions/facemesh/build.gradle

@@ -0,0 +1,50 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.3"
+
+    defaultConfig {
+        applicationId "com.google.mediapipe.apps.hands"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    // MediaPipe hands solution API and solution-core.
+    implementation 'com.google.mediapipe:solution-core:latest.release'
+    implementation 'com.google.mediapipe:facemesh:latest.release'
+    // MediaPipe deps
+    implementation 'com.google.flogger:flogger:latest.release'
+    implementation 'com.google.flogger:flogger-system-backend:latest.release'
+    implementation 'com.google.guava:guava:27.0.1-android'
+    implementation 'com.google.protobuf:protobuf-java:3.11.4'
+    // CameraX core library
+    def camerax_version = "1.0.0-beta10"
+    implementation "androidx.camera:camera-core:$camerax_version"
+    implementation "androidx.camera:camera-camera2:$camerax_version"
+    implementation "androidx.camera:camera-lifecycle:$camerax_version"
+}

mediapipe/examples/android/solutions/facemesh/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

mediapipe/examples/android/solutions/facemesh/src/main/AndroidManifest.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.mediapipe.examples.facemesh">
+
+  <uses-sdk
+      android:minSdkVersion="21"
+      android:targetSdkVersion="30" />
+
+  <!-- For loading images from gallery -->
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+  <!-- For using the camera -->
+  <uses-permission android:name="android.permission.CAMERA" />
+  <uses-feature android:name="android.hardware.camera" />
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="MediaPipe FaceMesh"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/AppTheme">
+    <activity android:name=".MainActivity"
+              android:screenOrientation="portrait">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

mediapipe/examples/android/solutions/facemesh/src/main/BUILD

@@ -0,0 +1,44 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])
+
+package(default_visibility = ["//visibility:private"])
+
+android_binary(
+    name = "facemesh",
+    srcs = glob(["**/*.java"]),
+    custom_package = "com.google.mediapipe.examples.facemesh",
+    manifest = "AndroidManifest.xml",
+    manifest_values = {
+        "applicationId": "com.google.mediapipe.examples.facemesh",
+    },
+    multidex = "native",
+    resource_files = ["//mediapipe/examples/android/solutions:resource_files"],
+    deps = [
+        "//mediapipe/framework/formats:landmark_java_proto_lite",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:camera_input",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:mediapipe_jni_lib",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:solution_rendering",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:video_input",
+        "//mediapipe/java/com/google/mediapipe/solutions/facemesh",
+        "//third_party:androidx_appcompat",
+        "//third_party:androidx_constraint_layout",
+        "//third_party:opencv",
+        "@maven//:androidx_activity_activity",
+        "@maven//:androidx_concurrent_concurrent_futures",
+        "@maven//:androidx_fragment_fragment",
+        "@maven//:com_google_guava_guava",
+    ],
+)

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultGlRenderer.java

@@ -0,0 +1,186 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facemesh;
+
+import android.opengl.GLES20;
+import android.opengl.Matrix;
+import com.google.common.collect.ImmutableSet;
+import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
+import com.google.mediapipe.solutioncore.ResultGlBoundary;
+import com.google.mediapipe.solutioncore.ResultGlRenderer;
+import com.google.mediapipe.solutions.facemesh.FaceMeshConnections;
+import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+import java.util.List;
+
+/** A custom implementation of {@link ResultGlRenderer} to render MediaPope FaceMesh results. */
+public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult> {
+  private static final String TAG = "FaceMeshResultGlRenderer";
+
+  private static final float[] TESSELATION_COLOR = new float[] {0.75f, 0.75f, 0.75f, 0.5f};
+  private static final int TESSELATION_THICKNESS = 5;
+  private static final float[] RIGHT_EYE_COLOR = new float[] {1f, 0.2f, 0.2f, 1f};
+  private static final int RIGHT_EYE_THICKNESS = 8;
+  private static final float[] RIGHT_EYEBROW_COLOR = new float[] {1f, 0.2f, 0.2f, 1f};
+  private static final int RIGHT_EYEBROW_THICKNESS = 8;
+  private static final float[] LEFT_EYE_COLOR = new float[] {0.2f, 1f, 0.2f, 1f};
+  private static final int LEFT_EYE_THICKNESS = 8;
+  private static final float[] LEFT_EYEBROW_COLOR = new float[] {0.2f, 1f, 0.2f, 1f};
+  private static final int LEFT_EYEBROW_THICKNESS = 8;
+  private static final float[] FACE_OVAL_COLOR = new float[] {0.9f, 0.9f, 0.9f, 1f};
+  private static final int FACE_OVAL_THICKNESS = 8;
+  private static final float[] LIPS_COLOR = new float[] {0.9f, 0.9f, 0.9f, 1f};
+  private static final int LIPS_THICKNESS = 8;
+  private static final String VERTEX_SHADER =
+      "uniform mat4 uTransformMatrix;\n"
+          + "attribute vec4 vPosition;\n"
+          + "void main() {\n"
+          + "  gl_Position = uTransformMatrix * vPosition;\n"
+          + "}";
+  private static final String FRAGMENT_SHADER =
+      "precision mediump float;\n"
+          + "uniform vec4 uColor;\n"
+          + "void main() {\n"
+          + "  gl_FragColor = uColor;\n"
+          + "}";
+  private int program;
+  private int positionHandle;
+  private int transformMatrixHandle;
+  private int colorHandle;
+  private final float[] transformMatrix = new float[16];
+
+  private int loadShader(int type, String shaderCode) {
+    int shader = GLES20.glCreateShader(type);
+    GLES20.glShaderSource(shader, shaderCode);
+    GLES20.glCompileShader(shader);
+    return shader;
+  }
+
+  @Override
+  public void setupRendering() {
+    program = GLES20.glCreateProgram();
+    int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER);
+    int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_SHADER);
+    GLES20.glAttachShader(program, vertexShader);
+    GLES20.glAttachShader(program, fragmentShader);
+    GLES20.glLinkProgram(program);
+    positionHandle = GLES20.glGetAttribLocation(program, "vPosition");
+    transformMatrixHandle = GLES20.glGetUniformLocation(program, "uTransformMatrix");
+    colorHandle = GLES20.glGetUniformLocation(program, "uColor");
+  }
+
+  @Override
+  public void renderResult(FaceMeshResult result, ResultGlBoundary boundary) {
+    if (result == null) {
+      return;
+    }
+    GLES20.glUseProgram(program);
+    // Sets the transform matrix to align the result rendering with the scaled output texture.
+    // Also flips the rendering vertically since OpenGL assumes the coordinate origin is at the
+    // bottom-left corner, whereas MediaPipe landmark data assumes the coordinate origin is at the
+    // top-left corner.
+    Matrix.setIdentityM(transformMatrix, 0);
+    Matrix.scaleM(
+        transformMatrix,
+        0,
+        2 / (boundary.right() - boundary.left()),
+        -2 / (boundary.top() - boundary.bottom()),
+        1.0f);
+    GLES20.glUniformMatrix4fv(transformMatrixHandle, 1, false, transformMatrix, 0);
+
+    int numFaces = result.multiFaceLandmarks().size();
+    for (int i = 0; i < numFaces; ++i) {
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_TESSELATION,
+          TESSELATION_COLOR,
+          TESSELATION_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_RIGHT_EYE,
+          RIGHT_EYE_COLOR,
+          RIGHT_EYE_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_RIGHT_EYEBROW,
+          RIGHT_EYEBROW_COLOR,
+          RIGHT_EYEBROW_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LEFT_EYE,
+          LEFT_EYE_COLOR,
+          LEFT_EYE_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LEFT_EYEBR0W,
+          LEFT_EYEBROW_COLOR,
+          LEFT_EYEBROW_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_FACE_OVAL,
+          FACE_OVAL_COLOR,
+          FACE_OVAL_THICKNESS);
+      drawLandmarks(
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LIPS,
+          LIPS_COLOR,
+          LIPS_THICKNESS);
+    }
+  }
+
+  /**
+   * Calls this to delete the shader program.
+   *
+   * <p>This is only necessary if one wants to release the program while keeping the context around.
+   */
+  public void release() {
+    GLES20.glDeleteProgram(program);
+  }
+
+  private void drawLandmarks(
+      List<NormalizedLandmark> faceLandmarkList,
+      ImmutableSet<FaceMeshConnections.Connection> connections,
+      float[] colorArray,
+      int thickness) {
+    GLES20.glUniform4fv(colorHandle, 1, colorArray, 0);
+    GLES20.glLineWidth(thickness);
+    for (FaceMeshConnections.Connection c : connections) {
+      float[] vertex = new float[4];
+      NormalizedLandmark start = faceLandmarkList.get(c.start());
+      vertex[0] = normalizedLandmarkValue(start.getX());
+      vertex[1] = normalizedLandmarkValue(start.getY());
+      NormalizedLandmark end = faceLandmarkList.get(c.end());
+      vertex[2] = normalizedLandmarkValue(end.getX());
+      vertex[3] = normalizedLandmarkValue(end.getY());
+      FloatBuffer vertexBuffer =
+          ByteBuffer.allocateDirect(vertex.length * 4)
+              .order(ByteOrder.nativeOrder())
+              .asFloatBuffer()
+              .put(vertex);
+      vertexBuffer.position(0);
+      GLES20.glEnableVertexAttribArray(positionHandle);
+      GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);
+      GLES20.glDrawArrays(GLES20.GL_LINES, 0, 2);
+    }
+  }
+
+  // Normalizes the value from the landmark value range:[0, 1] to the standard OpenGL coordinate
+  // value range: [-1, 1].
+  private float normalizedLandmarkValue(float value) {
+    return value * 2 - 1;
+  }
+}

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultImageView.java

@@ -0,0 +1,158 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facemesh;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import androidx.appcompat.widget.AppCompatImageView;
+import android.util.Size;
+import com.google.common.collect.ImmutableSet;
+import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
+import com.google.mediapipe.solutions.facemesh.FaceMeshConnections;
+import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
+import java.util.List;
+
+/** An ImageView implementation for displaying MediaPipe FaceMesh results. */
+public class FaceMeshResultImageView extends AppCompatImageView {
+  private static final String TAG = "FaceMeshResultImageView";
+
+  private static final int TESSELATION_COLOR = Color.parseColor("#70C0C0C0");
+  private static final int TESSELATION_THICKNESS = 5;
+  private static final int RIGHT_EYE_COLOR = Color.parseColor("#FF3030");
+  private static final int RIGHT_EYE_THICKNESS = 8;
+  private static final int RIGHT_EYEBROW_COLOR = Color.parseColor("#FF3030");
+  private static final int RIGHT_EYEBROW_THICKNESS = 8;
+  private static final int LEFT_EYE_COLOR = Color.parseColor("#30FF30");
+  private static final int LEFT_EYE_THICKNESS = 8;
+  private static final int LEFT_EYEBROW_COLOR = Color.parseColor("#30FF30");
+  private static final int LEFT_EYEBROW_THICKNESS = 8;
+  private static final int FACE_OVAL_COLOR = Color.parseColor("#E0E0E0");
+  private static final int FACE_OVAL_THICKNESS = 8;
+  private static final int LIPS_COLOR = Color.parseColor("#E0E0E0");
+  private static final int LIPS_THICKNESS = 8;
+  private Bitmap latest;
+
+  public FaceMeshResultImageView(Context context) {
+    super(context);
+    setScaleType(AppCompatImageView.ScaleType.FIT_CENTER);
+  }
+
+  /**
+   * Sets a {@link FaceMeshResult} to render.
+   *
+   * @param result a {@link FaceMeshResult} object that contains the solution outputs and the input
+   *     {@link Bitmap}.
+   */
+  public void setFaceMeshResult(FaceMeshResult result) {
+    if (result == null) {
+      return;
+    }
+    Bitmap bmInput = result.inputBitmap();
+    int width = bmInput.getWidth();
+    int height = bmInput.getHeight();
+    latest = Bitmap.createBitmap(width, height, bmInput.getConfig());
+    Canvas canvas = new Canvas(latest);
+    Size imageSize = new Size(width, height);
+    canvas.drawBitmap(bmInput, new Matrix(), null);
+    int numFaces = result.multiFaceLandmarks().size();
+    for (int i = 0; i < numFaces; ++i) {
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_TESSELATION,
+          imageSize,
+          TESSELATION_COLOR,
+          TESSELATION_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_RIGHT_EYE,
+          imageSize,
+          RIGHT_EYE_COLOR,
+          RIGHT_EYE_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_RIGHT_EYEBROW,
+          imageSize,
+          RIGHT_EYEBROW_COLOR,
+          RIGHT_EYEBROW_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LEFT_EYE,
+          imageSize,
+          LEFT_EYE_COLOR,
+          LEFT_EYE_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LEFT_EYEBR0W,
+          imageSize,
+          LEFT_EYEBROW_COLOR,
+          LEFT_EYEBROW_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_FACE_OVAL,
+          imageSize,
+          FACE_OVAL_COLOR,
+          FACE_OVAL_THICKNESS);
+      drawLandmarksOnCanvas(
+          canvas,
+          result.multiFaceLandmarks().get(i).getLandmarkList(),
+          FaceMeshConnections.FACEMESH_LIPS,
+          imageSize,
+          LIPS_COLOR,
+          LIPS_THICKNESS);
+    }
+  }
+
+  /** Updates the image view with the latest facemesh result. */
+  public void update() {
+    postInvalidate();
+    if (latest != null) {
+      setImageBitmap(latest);
+    }
+  }
+
+  // TODO: Better hand landmark and hand connection drawing.
+  private void drawLandmarksOnCanvas(
+      Canvas canvas,
+      List<NormalizedLandmark> faceLandmarkList,
+      ImmutableSet<FaceMeshConnections.Connection> connections,
+      Size imageSize,
+      int color,
+      int thickness) {
+    // Draw connections.
+    for (FaceMeshConnections.Connection c : connections) {
+      Paint connectionPaint = new Paint();
+      connectionPaint.setColor(color);
+      connectionPaint.setStrokeWidth(thickness);
+      NormalizedLandmark start = faceLandmarkList.get(c.start());
+      NormalizedLandmark end = faceLandmarkList.get(c.end());
+      canvas.drawLine(
+          start.getX() * imageSize.getWidth(),
+          start.getY() * imageSize.getHeight(),
+          end.getX() * imageSize.getWidth(),
+          end.getY() * imageSize.getHeight(),
+          connectionPaint);
+    }
+  }
+}

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/MainActivity.java

@@ -0,0 +1,308 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facemesh;
+
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import androidx.appcompat.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.FrameLayout;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
+import com.google.mediapipe.solutioncore.CameraInput;
+import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
+import com.google.mediapipe.solutioncore.VideoInput;
+import com.google.mediapipe.solutions.facemesh.FaceMesh;
+import com.google.mediapipe.solutions.facemesh.FaceMeshOptions;
+import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
+import java.io.IOException;
+
+/** Main activity of MediaPipe FaceMesh app. */
+public class MainActivity extends AppCompatActivity {
+  private static final String TAG = "MainActivity";
+
+  private FaceMesh facemesh;
+  // Run the pipeline and the model inference on GPU or CPU.
+  private static final boolean RUN_ON_GPU = true;
+
+  private enum InputSource {
+    UNKNOWN,
+    IMAGE,
+    VIDEO,
+    CAMERA,
+  }
+  private InputSource inputSource = InputSource.UNKNOWN;
+  // Image demo UI and image loader components.
+  private ActivityResultLauncher<Intent> imageGetter;
+  private FaceMeshResultImageView imageView;
+  // Video demo UI and video loader components.
+  private VideoInput videoInput;
+  private ActivityResultLauncher<Intent> videoGetter;
+  // Live camera demo UI and camera components.
+  private CameraInput cameraInput;
+  private SolutionGlSurfaceView<FaceMeshResult> glSurfaceView;
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_main);
+    setupStaticImageDemoUiComponents();
+    setupVideoDemoUiComponents();
+    setupLiveDemoUiComponents();
+  }
+
+  @Override
+  protected void onResume() {
+    super.onResume();
+    if (inputSource == InputSource.CAMERA) {
+      // Restarts the camera and the opengl surface rendering.
+      cameraInput = new CameraInput(this);
+      cameraInput.setNewFrameListener(textureFrame -> facemesh.send(textureFrame));
+      glSurfaceView.post(this::startCamera);
+      glSurfaceView.setVisibility(View.VISIBLE);
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.resume();
+    }
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    if (inputSource == InputSource.CAMERA) {
+      glSurfaceView.setVisibility(View.GONE);
+      cameraInput.close();
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.pause();
+    }
+  }
+
+  /** Sets up the UI components for the static image demo. */
+  private void setupStaticImageDemoUiComponents() {
+    // The Intent to access gallery and read images as bitmap.
+    imageGetter =
+        registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+              Intent resultIntent = result.getData();
+              if (resultIntent != null) {
+                if (result.getResultCode() == RESULT_OK) {
+                  Bitmap bitmap = null;
+                  try {
+                    bitmap =
+                        MediaStore.Images.Media.getBitmap(
+                            this.getContentResolver(), resultIntent.getData());
+                  } catch (IOException e) {
+                    Log.e(TAG, "Bitmap reading error:" + e);
+                  }
+                  if (bitmap != null) {
+                    facemesh.send(bitmap);
+                  }
+                }
+              }
+            });
+    Button loadImageButton = findViewById(R.id.button_load_picture);
+    loadImageButton.setOnClickListener(
+        v -> {
+          if (inputSource != InputSource.IMAGE) {
+            stopCurrentPipeline();
+            setupStaticImageModePipeline();
+          }
+          // Reads images from gallery.
+          Intent gallery =
+              new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
+          imageGetter.launch(gallery);
+        });
+    imageView = new FaceMeshResultImageView(this);
+  }
+
+  /** The core MediaPipe FaceMesh setup workflow for its static image mode. */
+  private void setupStaticImageModePipeline() {
+    this.inputSource = InputSource.IMAGE;
+    // Initializes a new MediaPipe FaceMesh instance in the static image mode.
+    facemesh =
+        new FaceMesh(
+            this,
+            FaceMeshOptions.builder()
+                .setMode(FaceMeshOptions.STATIC_IMAGE_MODE)
+                .setRunOnGpu(RUN_ON_GPU)
+                .build());
+
+    // Connects MediaPipe FaceMesh to the user-defined FaceMeshResultImageView.
+    facemesh.setResultListener(
+        faceMeshResult -> {
+          logNoseLandmark(faceMeshResult, /*showPixelValues=*/ true);
+          imageView.setFaceMeshResult(faceMeshResult);
+          runOnUiThread(() -> imageView.update());
+        });
+    facemesh.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe FaceMesh error:" + message));
+
+    // Updates the preview layout.
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
+    frameLayout.removeAllViewsInLayout();
+    imageView.setImageDrawable(null);
+    frameLayout.addView(imageView);
+    imageView.setVisibility(View.VISIBLE);
+  }
+
+  /** Sets up the UI components for the video demo. */
+  private void setupVideoDemoUiComponents() {
+    // The Intent to access gallery and read a video file.
+    videoGetter =
+        registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+              Intent resultIntent = result.getData();
+              if (resultIntent != null) {
+                if (result.getResultCode() == RESULT_OK) {
+                  glSurfaceView.post(
+                      () ->
+                          videoInput.start(
+                              this,
+                              resultIntent.getData(),
+                              facemesh.getGlContext(),
+                              glSurfaceView.getWidth(),
+                              glSurfaceView.getHeight()));
+                }
+              }
+            });
+    Button loadVideoButton = findViewById(R.id.button_load_video);
+    loadVideoButton.setOnClickListener(
+        v -> {
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.VIDEO);
+          // Reads video from gallery.
+          Intent gallery =
+              new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+          videoGetter.launch(gallery);
+        });
+  }
+
+  /** Sets up the UI components for the live demo with camera input. */
+  private void setupLiveDemoUiComponents() {
+    Button startCameraButton = findViewById(R.id.button_start_camera);
+    startCameraButton.setOnClickListener(
+        v -> {
+          if (inputSource == InputSource.CAMERA) {
+            return;
+          }
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.CAMERA);
+        });
+  }
+
+  /** The core MediaPipe FaceMesh setup workflow for its streaming mode. */
+  private void setupStreamingModePipeline(InputSource inputSource) {
+    this.inputSource = inputSource;
+    // Initializes a new MediaPipe FaceMesh instance in the streaming mode.
+    facemesh =
+        new FaceMesh(
+            this,
+            FaceMeshOptions.builder()
+                .setMode(FaceMeshOptions.STREAMING_MODE)
+                .setRunOnGpu(RUN_ON_GPU)
+                .build());
+    facemesh.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe FaceMesh error:" + message));
+
+    if (inputSource == InputSource.CAMERA) {
+      // Initializes a new CameraInput instance and connects it to MediaPipe FaceMesh.
+      cameraInput = new CameraInput(this);
+      cameraInput.setNewFrameListener(textureFrame -> facemesh.send(textureFrame));
+    } else if (inputSource == InputSource.VIDEO) {
+      // Initializes a new VideoInput instance and connects it to MediaPipe FaceMesh.
+      videoInput = new VideoInput(this);
+      videoInput.setNewFrameListener(textureFrame -> facemesh.send(textureFrame));
+    }
+
+    // Initializes a new Gl surface view with a user-defined FaceMeshResultGlRenderer.
+    glSurfaceView =
+        new SolutionGlSurfaceView<>(this, facemesh.getGlContext(), facemesh.getGlMajorVersion());
+    glSurfaceView.setSolutionResultRenderer(new FaceMeshResultGlRenderer());
+    glSurfaceView.setRenderInputImage(true);
+    facemesh.setResultListener(
+        faceMeshResult -> {
+          logNoseLandmark(faceMeshResult, /*showPixelValues=*/ false);
+          glSurfaceView.setRenderData(faceMeshResult);
+          glSurfaceView.requestRender();
+        });
+
+    // The runnable to start camera after the gl surface view is attached.
+    // For video input source, videoInput.start() will be called when the video uri is available.
+    if (inputSource == InputSource.CAMERA) {
+      glSurfaceView.post(this::startCamera);
+    }
+
+    // Updates the preview layout.
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
+    imageView.setVisibility(View.GONE);
+    frameLayout.removeAllViewsInLayout();
+    frameLayout.addView(glSurfaceView);
+    glSurfaceView.setVisibility(View.VISIBLE);
+    frameLayout.requestLayout();
+  }
+
+  private void startCamera() {
+    cameraInput.start(
+        this,
+        facemesh.getGlContext(),
+        CameraInput.CameraFacing.FRONT,
+        glSurfaceView.getWidth(),
+        glSurfaceView.getHeight());
+  }
+
+  private void stopCurrentPipeline() {
+    if (cameraInput != null) {
+      cameraInput.setNewFrameListener(null);
+      cameraInput.close();
+    }
+    if (videoInput != null) {
+      videoInput.setNewFrameListener(null);
+      videoInput.close();
+    }
+    if (glSurfaceView != null) {
+      glSurfaceView.setVisibility(View.GONE);
+    }
+    if (facemesh != null) {
+      facemesh.close();
+    }
+  }
+
+  private void logNoseLandmark(FaceMeshResult result, boolean showPixelValues) {
+    if (result == null || result.multiFaceLandmarks().isEmpty()) {
+      return;
+    }
+    NormalizedLandmark noseLandmark = result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
+    // For Bitmaps, show the pixel values. For texture inputs, show the normalized coordinates.
+    if (showPixelValues) {
+      int width = result.inputBitmap().getWidth();
+      int height = result.inputBitmap().getHeight();
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe FaceMesh nose coordinates (pixel values): x=%f, y=%f",
+              noseLandmark.getX() * width, noseLandmark.getY() * height));
+    } else {
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe FaceMesh nose normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              noseLandmark.getX(), noseLandmark.getY()));
+    }
+  }
+}

mediapipe/examples/android/solutions/facemesh/src/main/res

@@ -0,0 +1 @@
+../../../res

mediapipe/examples/android/solutions/hands/src/main/AndroidManifest.xml

@@ -19,7 +19,8 @@
       android:roundIcon="@mipmap/ic_launcher_round"
       android:supportsRtl="true"
       android:theme="@style/AppTheme">
-    <activity android:name=".MainActivity">
+    <activity android:name=".MainActivity"
+              android:screenOrientation="portrait">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
 

mediapipe/examples/android/solutions/hands/src/main/BUILD

@@ -31,10 +31,14 @@ android_binary(
         "//mediapipe/java/com/google/mediapipe/solutioncore:camera_input",
         "//mediapipe/java/com/google/mediapipe/solutioncore:mediapipe_jni_lib",
         "//mediapipe/java/com/google/mediapipe/solutioncore:solution_rendering",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:video_input",
         "//mediapipe/java/com/google/mediapipe/solutions/hands",
         "//third_party:androidx_appcompat",
         "//third_party:androidx_constraint_layout",
+        "//third_party:opencv",
+        "@maven//:androidx_activity_activity",
         "@maven//:androidx_concurrent_concurrent_futures",
+        "@maven//:androidx_fragment_fragment",
         "@maven//:com_google_guava_guava",
     ],
 )

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultGlRenderer.java

@@ -46,7 +46,6 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
   private int positionHandle;
   private int transformMatrixHandle;
   private final float[] transformMatrix = new float[16];
-  private FloatBuffer vertexBuffer;
 
   private int loadShader(int type, String shaderCode) {
     int shader = GLES20.glCreateShader(type);
@@ -74,12 +73,15 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
     }
     GLES20.glUseProgram(program);
     // Sets the transform matrix to align the result rendering with the scaled output texture.
+    // Also flips the rendering vertically since OpenGL assumes the coordinate origin is at the
+    // bottom-left corner, whereas MediaPipe landmark data assumes the coordinate origin is at the
+    // top-left corner.
     Matrix.setIdentityM(transformMatrix, 0);
     Matrix.scaleM(
         transformMatrix,
         0,
         2 / (boundary.right() - boundary.left()),
-        2 / (boundary.top() - boundary.bottom()),
+        -2 / (boundary.top() - boundary.bottom()),
         1.0f);
     GLES20.glUniformMatrix4fv(transformMatrixHandle, 1, false, transformMatrix, 0);
     GLES20.glLineWidth(CONNECTION_THICKNESS);
@@ -109,7 +111,7 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
       NormalizedLandmark end = handLandmarkList.get(c.end());
       vertex[2] = normalizedLandmarkValue(end.getX());
       vertex[3] = normalizedLandmarkValue(end.getY());
-      vertexBuffer =
+      FloatBuffer vertexBuffer =
           ByteBuffer.allocateDirect(vertex.length * 4)
               .order(ByteOrder.nativeOrder())
               .asFloatBuffer()

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultImageView.java

@@ -20,7 +20,7 @@ import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Matrix;
 import android.graphics.Paint;
-import android.widget.ImageView;
+import androidx.appcompat.widget.AppCompatImageView;
 import com.google.mediapipe.formats.proto.LandmarkProto;
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
 import com.google.mediapipe.solutions.hands.Hands;
@@ -28,17 +28,18 @@ import com.google.mediapipe.solutions.hands.HandsResult;
 import java.util.List;
 
 /** An ImageView implementation for displaying MediaPipe Hands results. */
-public class HandsResultImageView extends ImageView {
+public class HandsResultImageView extends AppCompatImageView {
   private static final String TAG = "HandsResultImageView";
 
   private static final int LANDMARK_COLOR = Color.RED;
   private static final int LANDMARK_RADIUS = 15;
   private static final int CONNECTION_COLOR = Color.GREEN;
   private static final int CONNECTION_THICKNESS = 10;
+  private Bitmap latest;
 
   public HandsResultImageView(Context context) {
     super(context);
-    setScaleType(ImageView.ScaleType.FIT_CENTER);
+    setScaleType(AppCompatImageView.ScaleType.FIT_CENTER);
   }
 
   /**
@@ -54,8 +55,8 @@ public class HandsResultImageView extends ImageView {
     Bitmap bmInput = result.inputBitmap();
     int width = bmInput.getWidth();
     int height = bmInput.getHeight();
-    Bitmap bmOutput = Bitmap.createBitmap(width, height, bmInput.getConfig());
+    latest = Bitmap.createBitmap(width, height, bmInput.getConfig());
-    Canvas canvas = new Canvas(bmOutput);
+    Canvas canvas = new Canvas(latest);
 
     canvas.drawBitmap(bmInput, new Matrix(), null);
     int numHands = result.multiHandLandmarks().size();
@@ -63,8 +64,14 @@ public class HandsResultImageView extends ImageView {
       drawLandmarksOnCanvas(
           result.multiHandLandmarks().get(i).getLandmarkList(), canvas, width, height);
     }
+  }
+
+  /** Updates the image view with the latest hands result. */
+  public void update() {
     postInvalidate();
-    setImageBitmap(bmOutput);
+    if (latest != null) {
+      setImageBitmap(latest);
+    }
   }
 
   // TODO: Better hand landmark and hand connection drawing.

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/MainActivity.java

@@ -28,6 +28,7 @@ import androidx.activity.result.contract.ActivityResultContracts;
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
 import com.google.mediapipe.solutioncore.CameraInput;
 import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
+import com.google.mediapipe.solutioncore.VideoInput;
 import com.google.mediapipe.solutions.hands.HandLandmark;
 import com.google.mediapipe.solutions.hands.Hands;
 import com.google.mediapipe.solutions.hands.HandsOptions;
@@ -39,14 +40,24 @@ public class MainActivity extends AppCompatActivity {
   private static final String TAG = "MainActivity";
 
   private Hands hands;
-  private int mode = HandsOptions.STATIC_IMAGE_MODE;
+  // Run the pipeline and the model inference on GPU or CPU.
+  private static final boolean RUN_ON_GPU = true;
+
+  private enum InputSource {
+    UNKNOWN,
+    IMAGE,
+    VIDEO,
+    CAMERA,
+  }
+  private InputSource inputSource = InputSource.UNKNOWN;
+
   // Image demo UI and image loader components.
-  private Button loadImageButton;
   private ActivityResultLauncher<Intent> imageGetter;
   private HandsResultImageView imageView;
-
+  // Video demo UI and video loader components.
+  private VideoInput videoInput;
+  private ActivityResultLauncher<Intent> videoGetter;
   // Live camera demo UI and camera components.
-  private Button startCameraButton;
   private CameraInput cameraInput;
   private SolutionGlSurfaceView<HandsResult> glSurfaceView;
 
@@ -55,26 +66,32 @@ public class MainActivity extends AppCompatActivity {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
     setupStaticImageDemoUiComponents();
+    setupVideoDemoUiComponents();
     setupLiveDemoUiComponents();
   }
 
   @Override
   protected void onResume() {
     super.onResume();
-    if (mode == HandsOptions.STREAMING_MODE) {
+    if (inputSource == InputSource.CAMERA) {
       // Restarts the camera and the opengl surface rendering.
       cameraInput = new CameraInput(this);
-      cameraInput.setCameraNewFrameListener(textureFrame -> hands.send(textureFrame));
+      cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));
       glSurfaceView.post(this::startCamera);
       glSurfaceView.setVisibility(View.VISIBLE);
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.resume();
     }
   }
 
   @Override
   protected void onPause() {
     super.onPause();
-    if (mode == HandsOptions.STREAMING_MODE) {
+    if (inputSource == InputSource.CAMERA) {
-      stopLiveDemo();
+      glSurfaceView.setVisibility(View.GONE);
+      cameraInput.close();
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.pause();
     }
   }
 
@@ -102,80 +119,122 @@ public class MainActivity extends AppCompatActivity {
                 }
               }
             });
-    loadImageButton = (Button) findViewById(R.id.button_load_picture);
+    Button loadImageButton = findViewById(R.id.button_load_picture);
     loadImageButton.setOnClickListener(
-        new View.OnClickListener() {
+        v -> {
-          @Override
+          if (inputSource != InputSource.IMAGE) {
-          public void onClick(View v) {
+            stopCurrentPipeline();
-            if (mode == HandsOptions.STREAMING_MODE) {
-              stopLiveDemo();
-            }
-            if (hands == null || mode != HandsOptions.STATIC_IMAGE_MODE) {
             setupStaticImageModePipeline();
           }
           // Reads images from gallery.
           Intent gallery =
               new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
           imageGetter.launch(gallery);
-          }
         });
     imageView = new HandsResultImageView(this);
   }
 
   /** The core MediaPipe Hands setup workflow for its static image mode. */
   private void setupStaticImageModePipeline() {
+    this.inputSource = InputSource.IMAGE;
     // Initializes a new MediaPipe Hands instance in the static image mode.
-    mode = HandsOptions.STATIC_IMAGE_MODE;
+    hands =
-    if (hands != null) {
+        new Hands(
-      hands.close();
+            this,
-    }
+            HandsOptions.builder()
-    hands = new Hands(this, HandsOptions.builder().setMode(mode).build());
+                .setMode(HandsOptions.STATIC_IMAGE_MODE)
+                .setMaxNumHands(1)
+                .setRunOnGpu(RUN_ON_GPU)
+                .build());
 
     // Connects MediaPipe Hands to the user-defined HandsResultImageView.
     hands.setResultListener(
         handsResult -> {
           logWristLandmark(handsResult, /*showPixelValues=*/ true);
-          runOnUiThread(() -> imageView.setHandsResult(handsResult));
+          imageView.setHandsResult(handsResult);
+          runOnUiThread(() -> imageView.update());
         });
-    hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe hands error:" + message));
+    hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
 
     // Updates the preview layout.
-    FrameLayout frameLayout = (FrameLayout) findViewById(R.id.preview_display_layout);
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
     frameLayout.removeAllViewsInLayout();
     imageView.setImageDrawable(null);
     frameLayout.addView(imageView);
     imageView.setVisibility(View.VISIBLE);
   }
 
+  /** Sets up the UI components for the video demo. */
+  private void setupVideoDemoUiComponents() {
+    // The Intent to access gallery and read a video file.
+    videoGetter =
+        registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+              Intent resultIntent = result.getData();
+              if (resultIntent != null) {
+                if (result.getResultCode() == RESULT_OK) {
+                  glSurfaceView.post(
+                      () ->
+                          videoInput.start(
+                              this,
+                              resultIntent.getData(),
+                              hands.getGlContext(),
+                              glSurfaceView.getWidth(),
+                              glSurfaceView.getHeight()));
+                }
+              }
+            });
+    Button loadVideoButton = findViewById(R.id.button_load_video);
+    loadVideoButton.setOnClickListener(
+        v -> {
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.VIDEO);
+          // Reads video from gallery.
+          Intent gallery =
+              new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+          videoGetter.launch(gallery);
+        });
+  }
+
   /** Sets up the UI components for the live demo with camera input. */
   private void setupLiveDemoUiComponents() {
-    startCameraButton = (Button) findViewById(R.id.button_start_camera);
+    Button startCameraButton = findViewById(R.id.button_start_camera);
     startCameraButton.setOnClickListener(
-        new View.OnClickListener() {
+        v -> {
-          @Override
+          if (inputSource == InputSource.CAMERA) {
-          public void onClick(View v) {
+            return;
-            if (hands == null || mode != HandsOptions.STREAMING_MODE) {
-              setupStreamingModePipeline();
-            }
           }
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.CAMERA);
         });
   }
 
   /** The core MediaPipe Hands setup workflow for its streaming mode. */
-  private void setupStreamingModePipeline() {
+  private void setupStreamingModePipeline(InputSource inputSource) {
+    this.inputSource = inputSource;
     // Initializes a new MediaPipe Hands instance in the streaming mode.
-    mode = HandsOptions.STREAMING_MODE;
+    hands =
-    if (hands != null) {
+        new Hands(
-      hands.close();
+            this,
-    }
+            HandsOptions.builder()
-    hands = new Hands(this, HandsOptions.builder().setMode(mode).build());
+                .setMode(HandsOptions.STREAMING_MODE)
-    hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe hands error:" + message));
+                .setMaxNumHands(1)
+                .setRunOnGpu(RUN_ON_GPU)
+                .build());
+    hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
 
+    if (inputSource == InputSource.CAMERA) {
       // Initializes a new CameraInput instance and connects it to MediaPipe Hands.
       cameraInput = new CameraInput(this);
-    cameraInput.setCameraNewFrameListener(textureFrame -> hands.send(textureFrame));
+      cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));
+    } else if (inputSource == InputSource.VIDEO) {
+      // Initializes a new VideoInput instance and connects it to MediaPipe Hands.
+      videoInput = new VideoInput(this);
+      videoInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));
+    }
 
-    // Initalizes a new Gl surface view with a user-defined HandsResultGlRenderer.
+    // Initializes a new Gl surface view with a user-defined HandsResultGlRenderer.
     glSurfaceView =
         new SolutionGlSurfaceView<>(this, hands.getGlContext(), hands.getGlMajorVersion());
     glSurfaceView.setSolutionResultRenderer(new HandsResultGlRenderer());
@@ -188,10 +247,13 @@ public class MainActivity extends AppCompatActivity {
         });
 
     // The runnable to start camera after the gl surface view is attached.
+    // For video input source, videoInput.start() will be called when the video uri is available.
+    if (inputSource == InputSource.CAMERA) {
       glSurfaceView.post(this::startCamera);
+    }
 
     // Updates the preview layout.
-    FrameLayout frameLayout = (FrameLayout) findViewById(R.id.preview_display_layout);
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
     imageView.setVisibility(View.GONE);
     frameLayout.removeAllViewsInLayout();
     frameLayout.addView(glSurfaceView);
@@ -208,34 +270,40 @@ public class MainActivity extends AppCompatActivity {
         glSurfaceView.getHeight());
   }
 
-  private void stopLiveDemo() {
+  private void stopCurrentPipeline() {
     if (cameraInput != null) {
-      cameraInput.stop();
+      cameraInput.setNewFrameListener(null);
+      cameraInput.close();
+    }
+    if (videoInput != null) {
+      videoInput.setNewFrameListener(null);
+      videoInput.close();
     }
     if (glSurfaceView != null) {
       glSurfaceView.setVisibility(View.GONE);
     }
+    if (hands != null) {
+      hands.close();
+    }
   }
 
   private void logWristLandmark(HandsResult result, boolean showPixelValues) {
     NormalizedLandmark wristLandmark = Hands.getHandLandmark(result, 0, HandLandmark.WRIST);
-    // For Bitmaps, show the pixel values. For texture inputs, show the normoralized cooridanates.
+    // For Bitmaps, show the pixel values. For texture inputs, show the normalized coordinates.
     if (showPixelValues) {
       int width = result.inputBitmap().getWidth();
       int height = result.inputBitmap().getHeight();
       Log.i(
           TAG,
-          "MediaPipe Hand wrist coordinates (pixel values): x= "
+          String.format(
-              + wristLandmark.getX() * width
+              "MediaPipe Hand wrist coordinates (pixel values): x=%f, y=%f",
-              + " y="
+              wristLandmark.getX() * width, wristLandmark.getY() * height));
-              + wristLandmark.getY() * height);
     } else {
       Log.i(
           TAG,
-          "MediaPipe Hand wrist normalized coordinates (value range: [0, 1]): x= "
+          String.format(
-              + wristLandmark.getX()
+              "MediaPipe Hand wrist normalized coordinates (value range: [0, 1]): x=%f, y=%f",
-              + " y="
+              wristLandmark.getX(), wristLandmark.getY()));
-              + wristLandmark.getY());
     }
   }
 }

mediapipe/examples/android/solutions/res/layout/activity_main.xml

@@ -8,18 +8,23 @@
         android:id="@+id/buttons"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:gravity="center"
+        style="?android:attr/buttonBarStyle" android:gravity="center"
         android:orientation="horizontal">
         <Button
             android:id="@+id/button_load_picture"
             android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+            style="?android:attr/buttonBarButtonStyle" android:layout_height="wrap_content"
-            android:text="Load Picture" />
+            android:text="@string/load_picture" />
+        <Button
+            android:id="@+id/button_load_video"
+            android:layout_width="wrap_content"
+            style="?android:attr/buttonBarButtonStyle" android:layout_height="wrap_content"
+            android:text="@string/load_video" />
         <Button
             android:id="@+id/button_start_camera"
             android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
+            style="?android:attr/buttonBarButtonStyle" android:layout_height="wrap_content"
-            android:text="Start Camera" />
+            android:text="@string/start_camera" />
     </LinearLayout>
     <FrameLayout
         android:id="@+id/preview_display_layout"
@@ -27,9 +32,9 @@
         android:layout_height="match_parent">
         <TextView
             android:id="@+id/no_view"
-            android:layout_width="wrap_content"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:gravity="center"
-            android:text="Please press any button above to start" />
+            android:text="@string/instruction" />
     </FrameLayout>
 </LinearLayout>

mediapipe/examples/android/solutions/res/values/strings.xml

@@ -1,3 +1,6 @@
 <resources>
-    <string name="no_camera_access" translatable="false">Please grant camera permissions.</string>
+    <string name="load_picture" translatable="false">Load Picture</string>
+    <string name="load_video" translatable="false">Load Video</string>
+    <string name="start_camera" translatable="false">Start Camera</string>
+    <string name="instruction" translatable="false">Please press any button above to start</string>
 </resources>

mediapipe/examples/android/solutions/settings.gradle

@@ -1,2 +1,3 @@
 rootProject.name = "mediapipe-solutions-examples"
 include ':hands'
+include ':facemesh'

mediapipe/examples/android/src/java/com/google/mediapipe/apps/basic/MainActivity.java

@@ -169,6 +169,7 @@ public class MainActivity extends AppCompatActivity {
 
   public void startCamera() {
     cameraHelper = new CameraXPreviewHelper();
+    previewFrameTexture = converter.getSurfaceTexture();
     cameraHelper.setOnCameraStartedListener(
         surfaceTexture -> {
           onCameraStarted(surfaceTexture);
@@ -178,7 +179,7 @@ public class MainActivity extends AppCompatActivity {
             ? CameraHelper.CameraFacing.FRONT
             : CameraHelper.CameraFacing.BACK;
     cameraHelper.startCamera(
-        this, cameraFacing, /*unusedSurfaceTexture=*/ null, cameraTargetResolution());
+        this, cameraFacing, previewFrameTexture, cameraTargetResolution());
   }
 
   protected Size computeViewSize(int width, int height) {
@@ -194,11 +195,8 @@ public class MainActivity extends AppCompatActivity {
     Size displaySize = cameraHelper.computeDisplaySizeFromViewSize(viewSize);
     boolean isCameraRotated = cameraHelper.isCameraRotated();
 
-    // Connect the converter to the camera-preview frames as its input (via
+    // Configure the output width and height as the computed display size.
-    // previewFrameTexture), and configure the output width and height as the computed
+    converter.setDestinationSize(
-    // display size.
-    converter.setSurfaceTextureAndAttachToGLContext(
-        previewFrameTexture,
         isCameraRotated ? displaySize.getHeight() : displaySize.getWidth(),
         isCameraRotated ? displaySize.getWidth() : displaySize.getHeight());
   }

mediapipe/examples/coral/BUILD

@@ -43,6 +43,7 @@ cc_library(
 cc_binary(
     name = "object_detection_tpu",
     deps = [
+        "//mediapipe/calculators/image:image_transformation_calculator",
         "//mediapipe/examples/coral:demo_run_graph_main",
         "//mediapipe/graphs/object_detection:desktop_tflite_calculators",
     ],
@@ -51,6 +52,12 @@ cc_binary(
 cc_binary(
     name = "face_detection_tpu",
     deps = [
+        "//mediapipe/calculators/image:image_transformation_calculator",
+        "//mediapipe/calculators/tflite:tflite_converter_calculator",
+        "//mediapipe/calculators/tflite:tflite_inference_calculator",
+        "//mediapipe/calculators/tflite:tflite_tensors_to_detections_calculator",
+        "//mediapipe/calculators/util:detection_label_id_to_text_calculator",
+        "//mediapipe/calculators/util:detection_letterbox_removal_calculator",
         "//mediapipe/examples/coral:demo_run_graph_main",
         "//mediapipe/graphs/face_detection:desktop_live_calculators",
     ],

mediapipe/examples/coral/Dockerfile

@@ -1,86 +0,0 @@
-# Copyright 2019 The MediaPipe Authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-#==== ! Prerequisite ! ====
-# $ sh mediapipe/examples/coral/setup.sh
-#====
-
-# for opencv 3.2 default
-FROM ubuntu:18.04
-
-MAINTAINER <mediapipe@google.com>
-
-WORKDIR /mediapipe
-
-ENV DEBIAN_FRONTEND=noninteractive
-
-# Install MediaPipe & Coral deps
-
-COPY update_sources.sh /
-RUN /update_sources.sh
-
-RUN dpkg --add-architecture armhf
-RUN dpkg --add-architecture arm64
-RUN apt-get update && apt-get install -y \
-  build-essential \
-  crossbuild-essential-arm64 \
-  libusb-1.0-0-dev:arm64 \
-  zlibc:arm64 \
-  pkg-config \
-  zip \
-  unzip \
-  curl \
-  wget \
-  git \
-  python \
-  python-pip \
-  python3-pip \
-  python-numpy \
-  vim-common \
-  ca-certificates \
-  emacs \
-  software-properties-common && \
-  add-apt-repository -y ppa:openjdk-r/ppa && \
-  apt-get update && apt-get install -y openjdk-8-jdk
-
-RUN pip install --upgrade setuptools
-RUN pip install future
-RUN pip3 install six
-
-COPY . /mediapipe/
-
-# Install bazel
-# Please match the current MediaPipe Bazel requirements according to docs.
-ARG BAZEL_VERSION=3.7.2
-RUN mkdir /bazel && \
-    wget --no-check-certificate -O /bazel/installer.sh "https://github.com/bazelbuild/bazel/releases/download/${BAZEL_VERSION}/bazel-${BAZEL_VERSION}-installer-linux-x86_64.sh" && \
-    wget --no-check-certificate -O  /bazel/LICENSE.txt "https://raw.githubusercontent.com/bazelbuild/bazel/master/LICENSE" && \
-    chmod +x /bazel/installer.sh && \
-    /bazel/installer.sh  && \
-    rm -f /bazel/installer.sh
-
-# OpenCV (3.2 default in 18.04)
-
-RUN apt-get update && apt-get install -y libopencv-dev
-
-# Opencv libs copied from coral device into opencv32_arm64_libs
-
-RUN cp opencv32_arm64_libs/* /usr/lib/aarch64-linux-gnu/.
-
-# Edge tpu header and lib
-
-RUN git clone https://github.com/google-coral/edgetpu.git /edgetpu
-RUN cp /edgetpu/libedgetpu/direct/aarch64/libedgetpu.so.1.0 /usr/lib/aarch64-linux-gnu/libedgetpu.so
-
-# See mediapipe/examples/coral/README.md to finish setup

mediapipe/examples/coral/Dockerfile.amd64

@@ -0,0 +1,45 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+FROM debian:buster
+MAINTAINER <mediapipe@google.com>
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  build-essential \
+  crossbuild-essential-arm64 \
+  pkg-config \
+  zip \
+  unzip \
+  curl \
+  wget \
+  git \
+  tree \
+  vim \
+  sudo \
+  python3-all \
+  python3-pip \
+  python3-numpy \
+  ca-certificates \
+  software-properties-common \
+  libusb-1.0-0-dev \
+  libopencv-core-dev \
+  libopencv-imgproc-dev \
+  libopencv-video-dev \
+  libopencv-highgui-dev \
+  libopencv-videoio-dev \
+  libopencv-contrib-dev
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 3
+RUN wget -O /usr/bin/bazel \
+         https://github.com/bazelbuild/bazelisk/releases/download/v1.10.0/bazelisk-linux-amd64 && \
+    echo "038c0990a48ccd69932e4e8ecf8baa459e05a6b4c9e4cc492ac836b777caaf9d  /usr/bin/bazel" sha256sum --check - && \
+    chmod +x /usr/bin/bazel
+ENV BAZEL_CPU=k8

mediapipe/examples/coral/Dockerfile.arm64

@@ -0,0 +1,47 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+FROM debian:buster
+MAINTAINER <mediapipe@google.com>
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  build-essential \
+  crossbuild-essential-arm64 \
+  pkg-config \
+  zip \
+  unzip \
+  curl \
+  wget \
+  git \
+  tree \
+  vim \
+  sudo \
+  python3-all \
+  python3-pip \
+  python3-numpy \
+  ca-certificates \
+  software-properties-common
+RUN dpkg --add-architecture arm64
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  libusb-1.0-0-dev:arm64 \
+  libopencv-core-dev:arm64 \
+  libopencv-imgproc-dev:arm64 \
+  libopencv-video-dev:arm64 \
+  libopencv-highgui-dev:arm64 \
+  libopencv-videoio-dev:arm64 \
+  libopencv-contrib-dev:arm64
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 3
+RUN wget -O /usr/bin/bazel \
+         https://github.com/bazelbuild/bazelisk/releases/download/v1.10.0/bazelisk-linux-amd64 && \
+    echo "038c0990a48ccd69932e4e8ecf8baa459e05a6b4c9e4cc492ac836b777caaf9d  /usr/bin/bazel" sha256sum --check - && \
+    chmod +x /usr/bin/bazel
+ENV BAZEL_CPU=aarch64

mediapipe/examples/coral/Dockerfile.armhf

@@ -0,0 +1,47 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+FROM debian:buster
+MAINTAINER <mediapipe@google.com>
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  build-essential \
+  crossbuild-essential-armhf \
+  pkg-config \
+  zip \
+  unzip \
+  curl \
+  wget \
+  git \
+  tree \
+  vim \
+  sudo \
+  python3-all \
+  python3-pip \
+  python3-numpy \
+  ca-certificates \
+  software-properties-common
+RUN dpkg --add-architecture armhf
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  libusb-1.0-0-dev:armhf \
+  libopencv-core-dev:armhf \
+  libopencv-imgproc-dev:armhf \
+  libopencv-video-dev:armhf \
+  libopencv-highgui-dev:armhf \
+  libopencv-videoio-dev:armhf \
+  libopencv-contrib-dev:armhf
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 3
+RUN wget -O /usr/bin/bazel \
+         https://github.com/bazelbuild/bazelisk/releases/download/v1.10.0/bazelisk-linux-amd64 && \
+    echo "038c0990a48ccd69932e4e8ecf8baa459e05a6b4c9e4cc492ac836b777caaf9d  /usr/bin/bazel" sha256sum --check - && \
+    chmod +x /usr/bin/bazel
+ENV BAZEL_CPU=armv7a

mediapipe/examples/coral/Makefile

@@ -0,0 +1,55 @@
+SHELL := /bin/bash
+
+MAKEFILE_DIR := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
+MEDIAPIPE_DIR := $(MAKEFILE_DIR)/../../..
+
+BAZEL_COMPILATION_MODE ?= opt
+BAZEL_TARGET ?= mediapipe/examples/coral:face_detection_tpu
+BAZEL_CPU ?= k8
+
+OUT_DIR := $(MEDIAPIPE_DIR)/out/$(BAZEL_CPU)
+
+PLATFORM ?= amd64
+DOCKER_FILE ?= $(MAKEFILE_DIR)/Dockerfile.$(PLATFORM)
+DOCKER_COMMAND ?=
+
+bazel_output = $(MEDIAPIPE_DIR)/bazel-bin/$(subst :,/,$(1))
+
+define run_command
+chmod a+w /; \
+groupadd --gid $(shell id -g) $(shell id -g -n); \
+useradd -m -e '' -s /bin/bash --gid $(shell id -g) --uid $(shell id -u) $(shell id -u -n); \
+echo '$(shell id -u -n) ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers; \
+su $(shell id -u -n) $(if $(1),-c '$(1)',)
+endef
+
+.PHONY: help
+help:
+	@echo "make help   - Print help"
+	@echo "make docker - Run Docker environment"
+	@echo "make build  - Run Bazel build, use BAZEL_TARGET to choose which target to build"
+
+ifeq (,$(wildcard /.dockerenv))
+.PHONY: docker
+docker:
+	docker run --rm -i --tty \
+	    -v $(MEDIAPIPE_DIR):/mediapipe \
+	    --workdir /mediapipe/ \
+	    $(shell docker build -q - < $(DOCKER_FILE)) \
+	    /bin/bash -c "$(call run_command,$(DOCKER_COMMAND))"
+endif
+
+.PHONY: build
+build:
+	(cd $(MEDIAPIPE_DIR) && \
+	 bazel build \
+	     --crosstool_top=@crosstool//:toolchains \
+	     --compiler=gcc \
+	     --cpu=${BAZEL_CPU} \
+	     --compilation_mode=${BAZEL_COMPILATION_MODE} \
+	     --define darwinn_portable=1 \
+	     --define MEDIAPIPE_DISABLE_GPU=1 \
+	     --define MEDIAPIPE_EDGE_TPU=all \
+	     $(BAZEL_TARGET) && \
+	 mkdir -p $(OUT_DIR) && \
+	 cp -f $(call bazel_output,$(BAZEL_TARGET)) $(OUT_DIR))

mediapipe/examples/coral/README.md

@@ -1,156 +1,173 @@
-# Coral Dev Board Setup (experimental)
+# Coral Support
 
-**Disclaimer**: Running MediaPipe on Coral is experimental, and this process may
+## Bazel Setup
-not be exact and is subject to change. These instructions have only been tested
-on the [Coral Dev Board](https://coral.ai/products/dev-board/)
-running [Mendel Enterprise Day 13](https://coral.ai/software/) OS and
-using [Diploria2](https://github.com/google-coral/edgetpu/tree/diploria2)
-edgetpu libs, and may vary for different devices and workstations.
 
-This file describes how to prepare a Coral Dev Board and setup a Linux
+You can compile MediaPipe with enabled Edge TPU support to run
-Docker container for building MediaPipe applications that run on Edge TPU.
+[Coral models](http://coral.ai/models). Just add
+`--define MEDIAPIPE_EDGE_TPU=<type>` to the `bazel` command:
 
-## Before creating the Docker
+* `--define MEDIAPIPE_EDGE_TPU=usb` for Coral USB devices on Linux and macOS
+* `--define MEDIAPIPE_EDGE_TPU=pci` for Coral PCIe devices on Linux
+* `--define MEDIAPIPE_EDGE_TPU=all` for both Coral USB and PCIe devices on Linux
 
-* (on host machine) run _setup.sh_ from MediaPipe root directory
+You have to install `libusb` library in order to compile with USB support:
 
-        sh mediapipe/examples/coral/setup.sh
+* `libusb-1.0-0-dev` on Linux
+* `libusb` on macOS via MacPorts or Homebrew
 
-* Setup the coral device via [here](https://coral.withgoogle.com/docs/dev-board/get-started/), and ensure the _mdt_ command works
+Command to compile face detection Coral example:
 
-        Note:   alias mdt="python3 -m mdt.main"    may be needed on some systems
+```bash
+bazel build \
+  --compilation_mode=opt \
+  --define darwinn_portable=1 \
+  --define MEDIAPIPE_DISABLE_GPU=1 \
+  --define MEDIAPIPE_EDGE_TPU=usb \
+  --linkopt=-l:libusb-1.0.so \
+  mediapipe/examples/coral:face_detection_tpu build
+```
 
-* (on coral device) prepare MediaPipe
+## Cross-compilation
 
-        cd ~
+Sometimes you need to cross-compile MediaPipe source code, e.g. get `ARM32`
-        sudo apt-get update && sudo apt-get install -y git
+or `ARM64` binaries on `x86` system. Install cross-compilation toolchain on
-        git clone https://github.com/google/mediapipe.git
+your system or use our preconfigured Docker environment for that:
-        mkdir mediapipe/bazel-bin
 
-* (on coral device) install opencv 3.2
+```bash
+# For ARM32 (e.g. Raspberry Pi)
+make -C mediapipe/examples/coral PLATFORM=armhf docker
 
-        sudo apt-get update && sudo apt-get install -y libopencv-dev
+# For ARM64 (e.g. Coral Dev Board)
+make -C mediapipe/examples/coral PLATFORM=arm64 docker
+```
 
-* (on coral device) find all opencv libs
+After running this command you'll get a shell to the Docker environment which
+has everything ready to start compilation:
 
-        find /usr/lib/aarch64-linux-gnu/ -name 'libopencv*so'
+```bash
+# For ARM32 (e.g. Raspberry Pi)
+bazel build \
+    --crosstool_top=@crosstool//:toolchains \
+    --compiler=gcc \
+    --cpu=armv7a \
+    --define darwinn_portable=1 \
+    --define MEDIAPIPE_DISABLE_GPU=1 \
+    --define MEDIAPIPE_EDGE_TPU=usb \
+    --linkopt=-l:libusb-1.0.so \
+    mediapipe/examples/coral:face_detection_tpu build
 
-* (on host machine) copy core opencv libs from coral device to a local folder inside MediaPipe checkout:
+# For ARM64 (e.g. Coral Dev Board)
+bazel build \
+    --crosstool_top=@crosstool//:toolchains \
+    --compiler=gcc \
+    --cpu=aarch64 \
+    --define darwinn_portable=1 \
+    --define MEDIAPIPE_DISABLE_GPU=1 \
+    --define MEDIAPIPE_EDGE_TPU=usb \
+    --linkopt=-l:libusb-1.0.so \
+    mediapipe/examples/coral:face_detection_tpu build
+```
 
-        # in root level mediapipe folder #
+Our Docker environment defines `${BAZEL_CPU}` value, so you can use it directly:
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_core.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_calib3d.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_features2d.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_highgui.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_imgcodecs.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_imgproc.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_video.so opencv32_arm64_libs
-        mdt pull /usr/lib/aarch64-linux-gnu/libopencv_videoio.so opencv32_arm64_libs
 
-* (on host machine) Create and start the docker environment
+```bash
+bazel build \
+    --crosstool_top=@crosstool//:toolchains \
+    --compiler=gcc \
+    --cpu=${BAZEL_CPU} \
+    --define darwinn_portable=1 \
+    --define MEDIAPIPE_DISABLE_GPU=1 \
+    --define MEDIAPIPE_EDGE_TPU=usb \
+    --linkopt=-l:libusb-1.0.so \
+    mediapipe/examples/coral:face_detection_tpu build
+```
 
-        # from mediapipe root level directory #
+The command above is already defined in our `Makefile`, so you can simply run:
-        docker build -t coral .
-        docker run -it --name coral coral:latest
 
-## Inside the Docker environment
+```bash
+make -C mediapipe/examples/coral \
+     BAZEL_TARGET=mediapipe/examples/coral:face_detection_tpu \
+     build
+```
 
-* Update library paths in /mediapipe/third_party/opencv_linux.BUILD
+The output binary will be automatically copied to `out/<platform>` directory.
 
-  (replace 'x86_64-linux-gnu' with 'aarch64-linux-gnu')
+You can also run compilation inside Docker environment as a single
+command:
 
-        "lib/aarch64-linux-gnu/libopencv_core.so",
+```bash
-        "lib/aarch64-linux-gnu/libopencv_calib3d.so",
+make -C mediapipe/examples/coral \
-        "lib/aarch64-linux-gnu/libopencv_features2d.so",
+     PLATFORM=armhf \
-        "lib/aarch64-linux-gnu/libopencv_highgui.so",
+     DOCKER_COMMAND="make -C mediapipe/examples/coral BAZEL_TARGET=mediapipe/examples/coral:face_detection_tpu build" \
-        "lib/aarch64-linux-gnu/libopencv_imgcodecs.so",
+     docker
-        "lib/aarch64-linux-gnu/libopencv_imgproc.so",
+```
-        "lib/aarch64-linux-gnu/libopencv_video.so",
-        "lib/aarch64-linux-gnu/libopencv_videoio.so",
 
-* Attempt to build hello world (to download external deps)
+and get the output binary from `out/<platform>` directory. Any Mediapipe target
+can be cross-compiled  this way, e.g. try
+`mediapipe/examples/desktop/hand_tracking:hand_tracking_cpu`.
 
-        bazel build -c opt --define MEDIAPIPE_DISABLE_GPU=1 mediapipe/examples/desktop/hello_world:hello_world
+To summarize everything:
 
-* Edit /edgetpu/libedgetpu/BUILD
+| Arch  | PLATFORM       | Output      | Board                                                    |
+| ----- | -------------- | ----------- | -------------------------------------------------------- |
+| ARM32 | PLATFORM=armhf | out/armv7a  | [Raspberry Pi](https://www.raspberrypi.org/products/)    |
+| ARM64 | PLATFORM=arm64 | out/aarch64 | [Coral Dev Board](https://coral.ai/products/dev-board/)  |
 
-     to add this build target
+## Coral Examples
 
-         cc_library(
+There are two Coral examples in `mediapipe/examples/coral` directory. Compile
-             name = "lib",
+them for your platform:
-             srcs = [
-                 "libedgetpu.so",
-             ],
-             visibility = ["//visibility:public"],
-         )
 
-* Edit /edgetpu/WORKSPACE
+```bash
+# Face detection
+make -C mediapipe/examples/coral \
+     PLATFORM=armhf \
+     DOCKER_COMMAND="make -C mediapipe/examples/coral BAZEL_TARGET=mediapipe/examples/coral:face_detection_tpu build" \
+     docker
 
-     update /mediapipe/WORKSPACE TENSORFLOW_* variables to match what /edgetpu/WORKSPACE has:
+# Object detection
+make -C mediapipe/examples/coral \
+     PLATFORM=armhf \
+     DOCKER_COMMAND="make -C mediapipe/examples/coral BAZEL_TARGET=mediapipe/examples/coral:object_detection_tpu build" \
+     docker
+```
 
-        grep TENSORFLOW_ /mediapipe/WORKSPACE
+Copy output binaries along with corresponding auxiliary files to your target
-        grep TENSORFLOW_ /edgetpu/WORKSPACE
+system. You can copy the whole `mediapipe` folder for simplicity:
 
-        # Make sure the /mediapipe/WORKSPACE  _TENSORFLOW_GIT_COMMIT  and  _TENSORFLOW_SHA256
+```bash
-        #   match the /edgetpu/WORKSPACE  TENSORFLOW_COMMIT  and  TENSORFLOW_SHA256  respectively.
+scp -r mediapipe <user>@<host>:.
+```
 
-        # If they do not match, modify /mediapipe/WORKSPACE to match what /edgetpu/WORKSPACE has.
+OpenCV runtime libraries need to be installed on your target system:
-        # Also comment out the MediaPipe org_tensorflow patch section.
 
-* Edit /mediapipe/mediapipe/calculators/tflite/BUILD to change rules for *tflite_inference_calculator.cc*
+```bash
+sudo apt-get install -y \
+    libopencv-core-dev \
+    libopencv-highgui-dev \
+    libopencv-calib3d-dev \
+    libopencv-features2d-dev \
+    libopencv-imgproc-dev \
+    libopencv-video-dev
+```
 
-        sed -i 's/\":tflite_inference_calculator_cc_proto\",/\":tflite_inference_calculator_cc_proto\",\n\t\"@edgetpu\/\/:header\",\n\t\"@libedgetpu\/\/:lib\",/g' /mediapipe/mediapipe/calculators/tflite/BUILD
+If you are going to connect Coral USB accelerator to your target system then
+you'll also need `libusb` library:
 
-      The above command should add
+```shell
+sudo apt-get install -y \
+   libusb-1.0-0
+```
 
-        "@edgetpu//:header",
+Connect USB camera and Coral device to your target system and run the copied
-        "@libedgetpu//:lib",
+binaries:
 
-      to the _deps_ of tflite_inference_calculator.cc
+```bash
-
+# Face Detection
-      Now also remove XNNPACK deps:
+GLOG_logtostderr=1 ./face_detection_tpu --calculator_graph_config_file \
-
+    mediapipe/examples/coral/graphs/face_detection_desktop_live.pbtxt
-        sed -i 's/\"@org_tensorflow\/\/tensorflow\/lite\/delegates\/xnnpack/#\"@org_tensorflow\/\/tensorflow\/lite\/delegates\/xnnpack/g' /mediapipe/mediapipe/calculators/tflite/BUILD
-
-#### Now try cross-compiling for device
-
-* Object detection demo
-
-![Object Detection running on Coral](./images/object_detection_demo_coral.jpg)
-
-        bazel build -c opt --crosstool_top=@crosstool//:toolchains --compiler=gcc --cpu=aarch64 --define MEDIAPIPE_DISABLE_GPU=1 --copt -DMEDIAPIPE_EDGE_TPU --copt=-flax-vector-conversions mediapipe/examples/coral:object_detection_tpu
-
- Copy object_detection_tpu binary to the MediaPipe checkout on the coral device
-
-        # outside docker env, open new terminal on host machine #
-        docker ps
-        docker cp <container-id>:/mediapipe/bazel-bin/mediapipe/examples/coral/object_detection_tpu /tmp/.
-        mdt push /tmp/object_detection_tpu /home/mendel/mediapipe/bazel-bin/.
-
-* Face detection demo
-
-![Face Detection running on Coral](./images/face_detection_demo_coral.gif)
-
-        bazel build -c opt --crosstool_top=@crosstool//:toolchains --compiler=gcc --cpu=aarch64 --define MEDIAPIPE_DISABLE_GPU=1 --copt -DMEDIAPIPE_EDGE_TPU --copt=-flax-vector-conversions mediapipe/examples/coral:face_detection_tpu
-
- Copy face_detection_tpu binary to the MediaPipe checkout on the coral device
-
-        # outside docker env, open new terminal on host machine #
-        docker ps
-        docker cp <container-id>:/mediapipe/bazel-bin/mediapipe/examples/coral/face_detection_tpu /tmp/.
-        mdt push /tmp/face_detection_tpu /home/mendel/mediapipe/bazel-bin/.
-
-## On the coral device (with display)
-
-     # Object detection
-     cd ~/mediapipe
-     chmod +x bazel-bin/object_detection_tpu
-     export GLOG_logtostderr=1
-     bazel-bin/object_detection_tpu --calculator_graph_config_file=mediapipe/examples/coral/graphs/object_detection_desktop_live.pbtxt
-
-     # Face detection
-     cd ~/mediapipe
-     chmod +x bazel-bin/face_detection_tpu
-     export GLOG_logtostderr=1
-     bazel-bin/face_detection_tpu --calculator_graph_config_file=mediapipe/examples/coral/graphs/face_detection_desktop_live.pbtxt
 
+# Object Detection
+GLOG_logtostderr=1 ./object_detection_tpu --calculator_graph_config_file \
+    mediapipe/examples/coral/graphs/object_detection_desktop_live.pbtxt
+```

mediapipe/examples/coral/WORKSPACE.coral

@@ -1,30 +0,0 @@
-
-### Coral additions to MediaPipe WORKSPACE ###
-
-#COMMIT=$(git ls-remote https://github.com/google-coral/crosstool master | awk '{print $1}')
-#SHA256=$(curl -L "https://github.com/google-coral/crosstool/archive/${COMMIT}.tar.gz" | sha256sum | awk '{print $1}')
-# Oct 2019
-#COMMIT=9e00d5be43bf001f883b5700f5d04882fea00229
-#SHA256=cb31b1417ccdcf7dd9fca5ec63e1571672372c30427730255997a547569d2feb
-http_archive(
-    name = "coral_crosstool",
-    sha256 = "cb31b1417ccdcf7dd9fca5ec63e1571672372c30427730255997a547569d2feb",
-    strip_prefix = "crosstool-9e00d5be43bf001f883b5700f5d04882fea00229",
-    urls = [
-        "https://github.com/google-coral/crosstool/archive/9e00d5be43bf001f883b5700f5d04882fea00229.tar.gz",
-    ],
-)
-load("@coral_crosstool//:configure.bzl", "cc_crosstool")
-cc_crosstool(name = "crosstool")
-
-# EdgeTPU
-new_local_repository(
-    name = "edgetpu",
-    path = "/edgetpu/libedgetpu",
-    build_file = "/edgetpu/libedgetpu/BUILD"
-)
-new_local_repository(
-    name = "libedgetpu",
-    path = "/usr/lib/aarch64-linux-gnu",
-    build_file = "/edgetpu/libedgetpu/BUILD"
-)

mediapipe/examples/coral/graphs/object_detection_desktop_live.pbtxt

@@ -74,43 +74,12 @@ node {
   }
 }
 
-# Generates a single side packet containing a vector of SSD anchors based on
-# the specification in the options.
-node {
-  calculator: "SsdAnchorsCalculator"
-  output_side_packet: "anchors"
-  options: {
-    [mediapipe.SsdAnchorsCalculatorOptions.ext] {
-      num_layers: 6
-      min_scale: 0.2
-      max_scale: 0.95
-      input_size_height: 300
-      input_size_width: 300
-      anchor_offset_x: 0.5
-      anchor_offset_y: 0.5
-      strides: 16
-      strides: 32
-      strides: 64
-      strides: 128
-      strides: 256
-      strides: 512
-      aspect_ratios: 1.0
-      aspect_ratios: 2.0
-      aspect_ratios: 0.5
-      aspect_ratios: 3.0
-      aspect_ratios: 0.3333
-      reduce_boxes_in_lowest_layer: true
-    }
-  }
-}
-
 # Decodes the detection tensors generated by the TensorFlow Lite model, based on
 # the SSD anchors and the specification in the options, into a vector of
 # detections. Each detection describes a detected object.
 node {
   calculator: "TfLiteTensorsToDetectionsCalculator"
   input_stream: "TENSORS:detection_tensors"
-  input_side_packet: "ANCHORS:anchors"
   output_stream: "DETECTIONS:detections"
   options: {
     [mediapipe.TfLiteTensorsToDetectionsCalculatorOptions.ext] {

mediapipe/examples/coral/setup.sh

@@ -1,34 +0,0 @@
-#!/bin/sh
-
-set -e
-set -v
-
-echo 'Please run this from root level mediapipe directory! \n Ex:'
-echo '  sh mediapipe/examples/coral/setup.sh  '
-
-sleep 3
-
-mkdir -p opencv32_arm64_libs
-
-# prepare docker aux script
-cp mediapipe/examples/coral/update_sources.sh update_sources.sh
-chmod +x update_sources.sh
-
-# backup non-coral Dockerfile
-mv Dockerfile Dockerfile.orig
-cp mediapipe/examples/coral/Dockerfile Dockerfile
-
-# backup non-coral workspace
-cp WORKSPACE WORKSPACE.orig
-
-# create temps
-cp WORKSPACE WORKSPACE.1
-cp mediapipe/examples/coral/WORKSPACE.coral WORKSPACE.2
-
-# merge (shell decides concat order, unless numbered appropriately)
-cat WORKSPACE.1 WORKSPACE.2 > WORKSPACE
-
-# cleanup
-rm WORKSPACE.1 WORKSPACE.2
-
-echo 'done'

mediapipe/examples/coral/update_sources.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-
-# To run in the Coral Docker environment.
-
-. /etc/os-release
-
-sed -i "s/deb\ /deb \[arch=amd64\]\ /g" /etc/apt/sources.list
-
-echo "deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports ${UBUNTU_CODENAME} main universe" >> /etc/apt/sources.list
-echo "deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports ${UBUNTU_CODENAME}-updates main universe" >> /etc/apt/sources.list
-echo "deb [arch=arm64,armhf] http://ports.ubuntu.com/ubuntu-ports ${UBUNTU_CODENAME}-security main universe" >> /etc/apt/sources.list

mediapipe/examples/desktop/autoflip/calculators/BUILD

@@ -17,8 +17,10 @@ load("//mediapipe/framework/port:build_config.bzl", "mediapipe_cc_proto_library"
 licenses(["notice"])
 
 package(default_visibility = [
+    "//buzz/diffractor/mediapipe:__subpackages__",
     "//mediapipe/examples:__subpackages__",
     "//mediapipe/viz:__subpackages__",
+    "//mediapipe/web/solutions:__subpackages__",
 ])
 
 cc_library(

mediapipe/examples/desktop/autoflip/calculators/border_detection_calculator_test.cc

@@ -43,6 +43,9 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kDetectedBordersTag[] = "DETECTED_BORDERS";
+constexpr char kVideoTag[] = "VIDEO";
+
 const char kConfig[] = R"(
     calculator: "BorderDetectionCalculator"
     input_stream: "VIDEO:camera_frames"
@@ -81,14 +84,14 @@ TEST(BorderDetectionCalculatorTest, NoBorderTest) {
       ImageFormat::SRGB, kTestFrameWidth, kTestFrameHeight);
   cv::Mat input_mat = mediapipe::formats::MatView(input_frame.get());
   input_mat.setTo(cv::Scalar(0, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(0, static_features.border().size());
@@ -115,14 +118,14 @@ TEST(BorderDetectionCalculatorTest, TopBorderTest) {
   cv::Mat sub_image =
       input_mat(cv::Rect(0, 0, kTestFrameWidth, kTopBorderHeight));
   sub_image.setTo(cv::Scalar(255, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(1, static_features.border().size());
@@ -155,14 +158,14 @@ TEST(BorderDetectionCalculatorTest, TopBorderPadTest) {
   cv::Mat sub_image =
       input_mat(cv::Rect(0, 0, kTestFrameWidth, kTopBorderHeight));
   sub_image.setTo(cv::Scalar(255, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(1, static_features.border().size());
@@ -197,14 +200,14 @@ TEST(BorderDetectionCalculatorTest, BottomBorderTest) {
       input_mat(cv::Rect(0, kTestFrameHeight - kBottomBorderHeight,
                          kTestFrameWidth, kBottomBorderHeight));
   bottom_image.setTo(cv::Scalar(255, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(1, static_features.border().size());
@@ -238,14 +241,14 @@ TEST(BorderDetectionCalculatorTest, TopBottomBorderTest) {
       input_mat(cv::Rect(0, kTestFrameHeight - kBottomBorderHeight,
                          kTestFrameWidth, kBottomBorderHeight));
   bottom_image.setTo(cv::Scalar(255, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(2, static_features.border().size());
@@ -291,14 +294,14 @@ TEST(BorderDetectionCalculatorTest, TopBottomBorderTestAspect2) {
       input_mat(cv::Rect(0, kTestFrameHeightTall - kBottomBorderHeight,
                          kTestFrameWidthTall, kBottomBorderHeight));
   bottom_image.setTo(cv::Scalar(255, 0, 0));
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(2, static_features.border().size());
@@ -352,14 +355,14 @@ TEST(BorderDetectionCalculatorTest, DominantColor) {
       input_mat(cv::Rect(0, 0, kTestFrameWidth / 2 + 50, kTestFrameHeight / 2));
   sub_image.setTo(cv::Scalar(255, 0, 0));
 
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("DETECTED_BORDERS").packets;
+      runner->Outputs().Tag(kDetectedBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   ASSERT_EQ(0, static_features.border().size());
@@ -383,7 +386,7 @@ void BM_Large(benchmark::State& state) {
     cv::Mat sub_image =
         input_mat(cv::Rect(0, 0, kTestFrameLargeWidth, kTopBorderHeight));
     sub_image.setTo(cv::Scalar(255, 0, 0));
-    runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+    runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
         Adopt(input_frame.release()).At(Timestamp::PostStream()));
 
     // Run the calculator.

mediapipe/examples/desktop/autoflip/calculators/content_zooming_calculator.cc

@@ -31,7 +31,11 @@ constexpr char kVideoSize[] = "VIDEO_SIZE";
 constexpr char kSalientRegions[] = "SALIENT_REGIONS";
 constexpr char kDetections[] = "DETECTIONS";
 constexpr char kDetectedBorders[] = "BORDERS";
+// Crop location as abs rect discretized.
 constexpr char kCropRect[] = "CROP_RECT";
+// Crop location as normalized rect.
+constexpr char kNormalizedCropRect[] = "NORMALIZED_CROP_RECT";
+// Crop location without position smoothing.
 constexpr char kFirstCropRect[] = "FIRST_CROP_RECT";
 // Can be used to control whether an animated zoom should actually performed
 // (configured through option us_to_first_rect). If provided, a non-zero integer
@@ -51,6 +55,8 @@ constexpr float kFieldOfView = 60;
 // Used to save state on Close and load state on Open in a new graph.
 // Can be used to preserve state between graphs.
 constexpr char kStateCache[] = "STATE_CACHE";
+// Tolerance for zooming out recentering.
+constexpr float kPixelTolerance = 3;
 
 namespace mediapipe {
 namespace autoflip {
@@ -166,6 +172,9 @@ absl::Status ContentZoomingCalculator::GetContract(
   if (cc->Outputs().HasTag(kCropRect)) {
     cc->Outputs().Tag(kCropRect).Set<mediapipe::Rect>();
   }
+  if (cc->Outputs().HasTag(kNormalizedCropRect)) {
+    cc->Outputs().Tag(kNormalizedCropRect).Set<mediapipe::NormalizedRect>();
+  }
   if (cc->Outputs().HasTag(kFirstCropRect)) {
     cc->Outputs().Tag(kFirstCropRect).Set<mediapipe::NormalizedRect>();
   }
@@ -553,6 +562,16 @@ absl::Status ContentZoomingCalculator::Process(
           cc->Outputs().Tag(kCropRect).Add(default_rect.release(),
                                            Timestamp(cc->InputTimestamp()));
         }
+        if (cc->Outputs().HasTag(kNormalizedCropRect)) {
+          auto default_rect = absl::make_unique<mediapipe::NormalizedRect>();
+          default_rect->set_x_center(0.5);
+          default_rect->set_y_center(0.5);
+          default_rect->set_width(1.0);
+          default_rect->set_height(1.0);
+          cc->Outputs()
+              .Tag(kNormalizedCropRect)
+              .Add(default_rect.release(), Timestamp(cc->InputTimestamp()));
+        }
         // Also provide a first crop rect: in this case a zero-sized one.
         if (cc->Outputs().HasTag(kFirstCropRect)) {
           cc->Outputs()
@@ -634,9 +653,9 @@ absl::Status ContentZoomingCalculator::Process(
   // Compute smoothed zoom camera path.
   MP_RETURN_IF_ERROR(path_solver_zoom_->AddObservation(
       height, cc->InputTimestamp().Microseconds()));
-  int path_height;
+  float path_height;
   MP_RETURN_IF_ERROR(path_solver_zoom_->GetState(&path_height));
-  int path_width = path_height * target_aspect_;
+  float path_width = path_height * target_aspect_;
 
   // Update pixel-per-degree value for pan/tilt.
   int target_height;
@@ -652,11 +671,48 @@ absl::Status ContentZoomingCalculator::Process(
       offset_x, cc->InputTimestamp().Microseconds()));
   MP_RETURN_IF_ERROR(path_solver_tilt_->AddObservation(
       offset_y, cc->InputTimestamp().Microseconds()));
-  int path_offset_x;
+  float path_offset_x;
   MP_RETURN_IF_ERROR(path_solver_pan_->GetState(&path_offset_x));
-  int path_offset_y;
+  float path_offset_y;
   MP_RETURN_IF_ERROR(path_solver_tilt_->GetState(&path_offset_y));
 
+  float delta_height;
+  MP_RETURN_IF_ERROR(path_solver_zoom_->GetDeltaState(&delta_height));
+  int delta_width = delta_height * target_aspect_;
+
+  // Smooth centering when zooming out.
+  float remaining_width = target_width - path_width;
+  int width_space = frame_width_ - target_width;
+  if (abs(path_offset_x - frame_width_ / 2) >
+          width_space / 2 + kPixelTolerance &&
+      remaining_width > kPixelTolerance) {
+    float required_width =
+        abs(path_offset_x - frame_width_ / 2) - width_space / 2;
+    if (path_offset_x < frame_width_ / 2) {
+      path_offset_x += delta_width * (required_width / remaining_width);
+      MP_RETURN_IF_ERROR(path_solver_pan_->SetState(path_offset_x));
+    } else {
+      path_offset_x -= delta_width * (required_width / remaining_width);
+      MP_RETURN_IF_ERROR(path_solver_pan_->SetState(path_offset_x));
+    }
+  }
+
+  float remaining_height = target_height - path_height;
+  int height_space = frame_height_ - target_height;
+  if (abs(path_offset_y - frame_height_ / 2) >
+          height_space / 2 + kPixelTolerance &&
+      remaining_height > kPixelTolerance) {
+    float required_height =
+        abs(path_offset_y - frame_height_ / 2) - height_space / 2;
+    if (path_offset_y < frame_height_ / 2) {
+      path_offset_y += delta_height * (required_height / remaining_height);
+      MP_RETURN_IF_ERROR(path_solver_tilt_->SetState(path_offset_y));
+    } else {
+      path_offset_y -= delta_height * (required_height / remaining_height);
+      MP_RETURN_IF_ERROR(path_solver_tilt_->SetState(path_offset_y));
+    }
+  }
+
   // Prevent box from extending beyond the image after camera smoothing.
   if (path_offset_y - ceil(path_height / 2.0) < 0) {
     path_offset_y = ceil(path_height / 2.0);
@@ -705,7 +761,7 @@ absl::Status ContentZoomingCalculator::Process(
     is_animating = IsAnimatingToFirstRect(cc->InputTimestamp());
   }
 
-  // Transmit downstream to glcroppingcalculator.
+  // Transmit downstream to glcroppingcalculator in discrete int values.
   if (cc->Outputs().HasTag(kCropRect)) {
     std::unique_ptr<mediapipe::Rect> gpu_rect;
     if (is_animating) {
@@ -716,13 +772,36 @@ absl::Status ContentZoomingCalculator::Process(
     } else {
       gpu_rect = absl::make_unique<mediapipe::Rect>();
       gpu_rect->set_x_center(path_offset_x);
-      gpu_rect->set_width(path_height * target_aspect_);
+      gpu_rect->set_width(path_width);
       gpu_rect->set_y_center(path_offset_y);
       gpu_rect->set_height(path_height);
     }
     cc->Outputs().Tag(kCropRect).Add(gpu_rect.release(),
                                      Timestamp(cc->InputTimestamp()));
   }
+  if (cc->Outputs().HasTag(kNormalizedCropRect)) {
+    std::unique_ptr<mediapipe::NormalizedRect> gpu_rect =
+        absl::make_unique<mediapipe::NormalizedRect>();
+    float float_frame_width = static_cast<float>(frame_width_);
+    float float_frame_height = static_cast<float>(frame_height_);
+    if (is_animating) {
+      auto rect =
+          GetAnimationRect(frame_width, frame_height, cc->InputTimestamp());
+      MP_RETURN_IF_ERROR(rect.status());
+      gpu_rect->set_x_center(rect->x_center() / float_frame_width);
+      gpu_rect->set_width(rect->width() / float_frame_width);
+      gpu_rect->set_y_center(rect->y_center() / float_frame_height);
+      gpu_rect->set_height(rect->height() / float_frame_height);
+    } else {
+      gpu_rect->set_x_center(path_offset_x / float_frame_width);
+      gpu_rect->set_width(path_width / float_frame_width);
+      gpu_rect->set_y_center(path_offset_y / float_frame_height);
+      gpu_rect->set_height(path_height / float_frame_height);
+    }
+    cc->Outputs()
+        .Tag(kNormalizedCropRect)
+        .Add(gpu_rect.release(), Timestamp(cc->InputTimestamp()));
+  }
 
   if (cc->Outputs().HasTag(kFirstCropRect)) {
     cc->Outputs()

mediapipe/examples/desktop/autoflip/calculators/content_zooming_calculator_test.cc

@@ -38,6 +38,17 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kFirstCropRectTag[] = "FIRST_CROP_RECT";
+constexpr char kStateCacheTag[] = "STATE_CACHE";
+constexpr char kCropRectTag[] = "CROP_RECT";
+constexpr char kBordersTag[] = "BORDERS";
+constexpr char kSalientRegionsTag[] = "SALIENT_REGIONS";
+constexpr char kVideoTag[] = "VIDEO";
+constexpr char kMaxZoomFactorPctTag[] = "MAX_ZOOM_FACTOR_PCT";
+constexpr char kAnimateZoomTag[] = "ANIMATE_ZOOM";
+constexpr char kVideoSizeTag[] = "VIDEO_SIZE";
+constexpr char kDetectionsTag[] = "DETECTIONS";
+
 const char kConfigA[] = R"(
     calculator: "ContentZoomingCalculator"
     input_stream: "VIDEO:camera_frames"
@@ -48,12 +59,15 @@ const char kConfigA[] = R"(
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -73,12 +87,15 @@ const char kConfigB[] = R"(
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -94,12 +111,15 @@ const char kConfigC[] = R"(
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -111,17 +131,21 @@ const char kConfigD[] = R"(
     input_stream: "DETECTIONS:detections"
     output_stream: "CROP_RECT:rect"
     output_stream: "FIRST_CROP_RECT:first_rect"
+    output_stream: "NORMALIZED_CROP_RECT:float_rect"
     options: {
       [mediapipe.autoflip.ContentZoomingCalculatorOptions.ext]: {
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -139,12 +163,15 @@ const char kConfigE[] = R"(
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -162,12 +189,15 @@ const char kConfigF[] = R"(
         max_zoom_value_deg: 0
         kinematic_options_zoom {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_tilt {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
         kinematic_options_pan {
           min_motion_to_reframe: 1.2
+          max_velocity: 18
         }
       }
     }
@@ -220,17 +250,17 @@ void AddDetectionFrameSize(const cv::Rect_<float>& position, const int64 time,
     detections->push_back(detection);
   }
   runner->MutableInputs()
-      ->Tag("DETECTIONS")
+      ->Tag(kDetectionsTag)
       .packets.push_back(Adopt(detections.release()).At(Timestamp(time)));
 
   auto input_size = ::absl::make_unique<std::pair<int, int>>(width, height);
   runner->MutableInputs()
-      ->Tag("VIDEO_SIZE")
+      ->Tag(kVideoSizeTag)
       .packets.push_back(Adopt(input_size.release()).At(Timestamp(time)));
 
   if (flags.animated_zoom.has_value()) {
     runner->MutableInputs()
-        ->Tag("ANIMATE_ZOOM")
+        ->Tag(kAnimateZoomTag)
         .packets.push_back(
             mediapipe::MakePacket<bool>(flags.animated_zoom.value())
                 .At(Timestamp(time)));
@@ -238,7 +268,7 @@ void AddDetectionFrameSize(const cv::Rect_<float>& position, const int64 time,
 
   if (flags.max_zoom_factor_percent.has_value()) {
     runner->MutableInputs()
-        ->Tag("MAX_ZOOM_FACTOR_PCT")
+        ->Tag(kMaxZoomFactorPctTag)
         .packets.push_back(
             mediapipe::MakePacket<int>(flags.max_zoom_factor_percent.value())
                 .At(Timestamp(time)));
@@ -250,6 +280,21 @@ void AddDetection(const cv::Rect_<float>& position, const int64 time,
   AddDetectionFrameSize(position, time, 1000, 1000, runner);
 }
 
+void CheckCropRectFloats(const float x_center, const float y_center,
+                         const float width, const float height,
+                         const int frame_number,
+                         const CalculatorRunner::StreamContentsSet& output) {
+  ASSERT_GT(output.Tag("NORMALIZED_CROP_RECT").packets.size(), frame_number);
+  auto float_rect = output.Tag("NORMALIZED_CROP_RECT")
+                        .packets[frame_number]
+                        .Get<mediapipe::NormalizedRect>();
+
+  EXPECT_FLOAT_EQ(float_rect.x_center(), x_center);
+  EXPECT_FLOAT_EQ(float_rect.y_center(), y_center);
+  EXPECT_FLOAT_EQ(float_rect.width(), width);
+  EXPECT_FLOAT_EQ(float_rect.height(), height);
+}
+
 void CheckCropRect(const int x_center, const int y_center, const int width,
                    const int height, const int frame_number,
                    const std::vector<Packet>& output_packets) {
@@ -274,21 +319,21 @@ TEST(ContentZoomingCalculatorTest, ZoomTest) {
 
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 1000, 1000);
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp(0)));
 
   runner->MutableInputs()
-      ->Tag("SALIENT_REGIONS")
+      ->Tag(kSalientRegionsTag)
       .packets.push_back(Adopt(detection_set.release()).At(Timestamp(0)));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("BORDERS").packets;
+      runner->Outputs().Tag(kBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
-  CheckBorder(static_features, 1000, 1000, 495, 395);
+  CheckBorder(static_features, 1000, 1000, 494, 394);
 }
 
 TEST(ContentZoomingCalculatorTest, ZoomTestFullPTZ) {
@@ -297,7 +342,7 @@ TEST(ContentZoomingCalculatorTest, ZoomTestFullPTZ) {
   AddDetection(cv::Rect_<float>(.4, .5, .1, .1), 0, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(450, 550, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, PanConfig) {
@@ -313,9 +358,9 @@ TEST(ContentZoomingCalculatorTest, PanConfig) {
   AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 1000000, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(450, 550, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(483, 550, 111, 111, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, PanConfigWithCache) {
@@ -330,31 +375,31 @@ TEST(ContentZoomingCalculatorTest, PanConfigWithCache) {
   options->mutable_kinematic_options_zoom()->set_min_motion_to_reframe(50.0);
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetection(cv::Rect_<float>(.4, .5, .1, .1), 0, runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(450, 550, 111, 111, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 1000000, runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(483, 550, 111, 111, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   // Now repeat the last frame for a new runner without the cache to see a reset
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(nullptr);
     AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 2000000, runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(525, 625, 166, 166, 0,  // Without a cache, state was lost.
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
 }
 
@@ -371,9 +416,9 @@ TEST(ContentZoomingCalculatorTest, TiltConfig) {
   AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 1000000, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(450, 550, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(450, 583, 111, 111, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ZoomConfig) {
@@ -389,9 +434,9 @@ TEST(ContentZoomingCalculatorTest, ZoomConfig) {
   AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 1000000, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(450, 550, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
-  CheckCropRect(450, 550, 139, 139, 1,
+  CheckCropRect(450, 550, 138, 138, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ZoomConfigWithCache) {
@@ -406,31 +451,31 @@ TEST(ContentZoomingCalculatorTest, ZoomConfigWithCache) {
   options->mutable_kinematic_options_zoom()->set_update_rate_seconds(2);
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetection(cv::Rect_<float>(.4, .5, .1, .1), 0, runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(450, 550, 111, 111, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 1000000, runner.get());
     MP_ASSERT_OK(runner->Run());
-    CheckCropRect(450, 550, 139, 139, 0,
+    CheckCropRect(450, 550, 138, 138, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   // Now repeat the last frame for a new runner without the cache to see a reset
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(nullptr);
     AddDetection(cv::Rect_<float>(.45, .55, .15, .15), 2000000, runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(525, 625, 166, 166, 0,  // Without a cache, state was lost.
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
 }
 
@@ -448,18 +493,18 @@ TEST(ContentZoomingCalculatorTest, MinAspectBorderValues) {
 
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 1000, 1000);
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp(0)));
 
   runner->MutableInputs()
-      ->Tag("SALIENT_REGIONS")
+      ->Tag(kSalientRegionsTag)
       .packets.push_back(Adopt(detection_set.release()).At(Timestamp(0)));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("BORDERS").packets;
+      runner->Outputs().Tag(kBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
   CheckBorder(static_features, 1000, 1000, 250, 250);
@@ -485,18 +530,18 @@ TEST(ContentZoomingCalculatorTest, TwoFacesWide) {
 
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 1000, 1000);
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp(0)));
 
   runner->MutableInputs()
-      ->Tag("SALIENT_REGIONS")
+      ->Tag(kSalientRegionsTag)
       .packets.push_back(Adopt(detection_set.release()).At(Timestamp(0)));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("BORDERS").packets;
+      runner->Outputs().Tag(kBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
 
@@ -510,18 +555,18 @@ TEST(ContentZoomingCalculatorTest, NoDetectionOnInit) {
 
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 1000, 1000);
-  runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+  runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
       Adopt(input_frame.release()).At(Timestamp(0)));
 
   runner->MutableInputs()
-      ->Tag("SALIENT_REGIONS")
+      ->Tag(kSalientRegionsTag)
       .packets.push_back(Adopt(detection_set.release()).At(Timestamp(0)));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("BORDERS").packets;
+      runner->Outputs().Tag(kBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
 
@@ -542,21 +587,21 @@ TEST(ContentZoomingCalculatorTest, ZoomTestPairSize) {
 
   auto input_size = ::absl::make_unique<std::pair<int, int>>(1000, 1000);
   runner->MutableInputs()
-      ->Tag("VIDEO_SIZE")
+      ->Tag(kVideoSizeTag)
       .packets.push_back(Adopt(input_size.release()).At(Timestamp(0)));
 
   runner->MutableInputs()
-      ->Tag("SALIENT_REGIONS")
+      ->Tag(kSalientRegionsTag)
       .packets.push_back(Adopt(detection_set.release()).At(Timestamp(0)));
 
   // Run the calculator.
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("BORDERS").packets;
+      runner->Outputs().Tag(kBordersTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& static_features = output_packets[0].Get<StaticFeatures>();
-  CheckBorder(static_features, 1000, 1000, 495, 395);
+  CheckBorder(static_features, 1000, 1000, 494, 394);
 }
 
 TEST(ContentZoomingCalculatorTest, ZoomTestNearOutsideBorder) {
@@ -571,9 +616,9 @@ TEST(ContentZoomingCalculatorTest, ZoomTestNearOutsideBorder) {
   AddDetection(cv::Rect_<float>(.9, .9, .1, .1), 1000000, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(972, 972, 55, 55, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
-  CheckCropRect(958, 958, 83, 83, 1,
+  CheckCropRect(944, 944, 83, 83, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ZoomTestNearInsideBorder) {
@@ -587,8 +632,8 @@ TEST(ContentZoomingCalculatorTest, ZoomTestNearInsideBorder) {
   AddDetection(cv::Rect_<float>(0, 0, .05, .05), 0, runner.get());
   AddDetection(cv::Rect_<float>(0, 0, .1, .1), 1000000, runner.get());
   MP_ASSERT_OK(runner->Run());
-  CheckCropRect(28, 28, 55, 55, 0, runner->Outputs().Tag("CROP_RECT").packets);
+  CheckCropRect(28, 28, 55, 55, 0, runner->Outputs().Tag(kCropRectTag).packets);
-  CheckCropRect(42, 42, 83, 83, 1, runner->Outputs().Tag("CROP_RECT").packets);
+  CheckCropRect(56, 56, 83, 83, 1, runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, VerticalShift) {
@@ -601,7 +646,9 @@ TEST(ContentZoomingCalculatorTest, VerticalShift) {
   MP_ASSERT_OK(runner->Run());
   // 1000px * .1 offset + 1000*.1*.1 shift = 170
   CheckCropRect(150, 170, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
+  CheckCropRectFloats(150 / 1000.0, 170 / 1000.0, 111 / 1000.0, 111 / 1000.0, 0,
+                      runner->Outputs());
 }
 
 TEST(ContentZoomingCalculatorTest, HorizontalShift) {
@@ -614,7 +661,9 @@ TEST(ContentZoomingCalculatorTest, HorizontalShift) {
   MP_ASSERT_OK(runner->Run());
   // 1000px * .1 offset + 1000*.1*.1 shift = 170
   CheckCropRect(170, 150, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
+  CheckCropRectFloats(170 / 1000.0, 150 / 1000.0, 111 / 1000.0, 111 / 1000.0, 0,
+                      runner->Outputs());
 }
 
 TEST(ContentZoomingCalculatorTest, ShiftOutsideBounds) {
@@ -627,14 +676,14 @@ TEST(ContentZoomingCalculatorTest, ShiftOutsideBounds) {
   AddDetection(cv::Rect_<float>(.9, 0, .1, .1), 0, runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(944, 56, 111, 111, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, EmptySize) {
   auto config = ParseTextProtoOrDie<CalculatorGraphConfig::Node>(kConfigD);
   auto runner = ::absl::make_unique<CalculatorRunner>(config);
   MP_ASSERT_OK(runner->Run());
-  ASSERT_EQ(runner->Outputs().Tag("CROP_RECT").packets.size(), 0);
+  ASSERT_EQ(runner->Outputs().Tag(kCropRectTag).packets.size(), 0);
 }
 
 TEST(ContentZoomingCalculatorTest, EmptyDetections) {
@@ -642,11 +691,11 @@ TEST(ContentZoomingCalculatorTest, EmptyDetections) {
   auto runner = ::absl::make_unique<CalculatorRunner>(config);
   auto input_size = ::absl::make_unique<std::pair<int, int>>(1000, 1000);
   runner->MutableInputs()
-      ->Tag("VIDEO_SIZE")
+      ->Tag(kVideoSizeTag)
       .packets.push_back(Adopt(input_size.release()).At(Timestamp(0)));
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 1000, 1000, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ResolutionChangeStationary) {
@@ -658,9 +707,9 @@ TEST(ContentZoomingCalculatorTest, ResolutionChangeStationary) {
                         runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 222, 222, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500 * 0.5, 500 * 0.5, 222 * 0.5, 222 * 0.5, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ResolutionChangeStationaryWithCache) {
@@ -669,23 +718,23 @@ TEST(ContentZoomingCalculatorTest, ResolutionChangeStationaryWithCache) {
   config.add_input_side_packet("STATE_CACHE:state_cache");
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetectionFrameSize(cv::Rect_<float>(.4, .4, .2, .2), 0, 1000, 1000,
                           runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(500, 500, 222, 222, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetectionFrameSize(cv::Rect_<float>(.4, .4, .2, .2), 1, 500, 500,
                           runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(500 * 0.5, 500 * 0.5, 222 * 0.5, 222 * 0.5, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
 }
 
@@ -700,11 +749,11 @@ TEST(ContentZoomingCalculatorTest, ResolutionChangeZooming) {
                         runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 888, 888, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 588, 588, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500 * 0.5, 500 * 0.5, 288 * 0.5, 288 * 0.5, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ResolutionChangeZoomingWithCache) {
@@ -713,18 +762,18 @@ TEST(ContentZoomingCalculatorTest, ResolutionChangeZoomingWithCache) {
   config.add_input_side_packet("STATE_CACHE:state_cache");
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetectionFrameSize(cv::Rect_<float>(.1, .1, .8, .8), 0, 1000, 1000,
                           runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(500, 500, 888, 888, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
   // The second runner should just resume based on state from the first runner.
   {
     auto runner = ::absl::make_unique<CalculatorRunner>(config);
-    runner->MutableSidePackets()->Tag("STATE_CACHE") = MakePacket<
+    runner->MutableSidePackets()->Tag(kStateCacheTag) = MakePacket<
         mediapipe::autoflip::ContentZoomingCalculatorStateCacheType*>(&cache);
     AddDetectionFrameSize(cv::Rect_<float>(.4, .4, .2, .2), 1000000, 1000, 1000,
                           runner.get());
@@ -732,9 +781,9 @@ TEST(ContentZoomingCalculatorTest, ResolutionChangeZoomingWithCache) {
                           runner.get());
     MP_ASSERT_OK(runner->Run());
     CheckCropRect(500, 500, 588, 588, 0,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
     CheckCropRect(500 * 0.5, 500 * 0.5, 288 * 0.5, 288 * 0.5, 1,
-                  runner->Outputs().Tag("CROP_RECT").packets);
+                  runner->Outputs().Tag(kCropRectTag).packets);
   }
 }
 
@@ -749,7 +798,7 @@ TEST(ContentZoomingCalculatorTest, MaxZoomValue) {
   MP_ASSERT_OK(runner->Run());
   // 55/60 * 1000 = 916
   CheckCropRect(500, 500, 916, 916, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, MaxZoomValueOverride) {
@@ -772,11 +821,11 @@ TEST(ContentZoomingCalculatorTest, MaxZoomValueOverride) {
   // Max. 133% zoomed in means min. (100/133) ~ 75% of height left: ~360
   // Max. 166% zoomed in means min. (100/166) ~ 60% of height left: ~430
   CheckCropRect(320, 240, 480, 360, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(640, 360, 769, 433, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(320, 240, 480, 360, 3,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, MaxZoomOutValue) {
@@ -795,9 +844,9 @@ TEST(ContentZoomingCalculatorTest, MaxZoomOutValue) {
   MP_ASSERT_OK(runner->Run());
   // 55/60 * 1000 = 916
   CheckCropRect(500, 500, 950, 950, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 1000, 1000, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, StartZoomedOut) {
@@ -816,13 +865,13 @@ TEST(ContentZoomingCalculatorTest, StartZoomedOut) {
                         runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 1000, 1000, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 880, 880, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 760, 760, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 655, 655, 3,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, AnimateToFirstRect) {
@@ -844,15 +893,15 @@ TEST(ContentZoomingCalculatorTest, AnimateToFirstRect) {
                         runner.get());
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 1000, 1000, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 1000, 1000, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 470, 470, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 222, 222, 3,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 222, 222, 4,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, CanControlAnimation) {
@@ -879,15 +928,15 @@ TEST(ContentZoomingCalculatorTest, CanControlAnimation) {
                         runner.get(), {.animated_zoom = false});
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 1000, 1000, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 1000, 1000, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 470, 470, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 222, 222, 3,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 222, 222, 4,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, DoesNotAnimateIfDisabledViaInput) {
@@ -907,11 +956,11 @@ TEST(ContentZoomingCalculatorTest, DoesNotAnimateIfDisabledViaInput) {
                         runner.get(), {.animated_zoom = false});
   MP_ASSERT_OK(runner->Run());
   CheckCropRect(500, 500, 1000, 1000, 0,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 880, 880, 1,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
   CheckCropRect(500, 500, 760, 760, 2,
-                runner->Outputs().Tag("CROP_RECT").packets);
+                runner->Outputs().Tag(kCropRectTag).packets);
 }
 
 TEST(ContentZoomingCalculatorTest, ProvidesZeroSizeFirstRectWithoutDetections) {
@@ -920,13 +969,13 @@ TEST(ContentZoomingCalculatorTest, ProvidesZeroSizeFirstRectWithoutDetections) {
 
   auto input_size = ::absl::make_unique<std::pair<int, int>>(1000, 1000);
   runner->MutableInputs()
-      ->Tag("VIDEO_SIZE")
+      ->Tag(kVideoSizeTag)
       .packets.push_back(Adopt(input_size.release()).At(Timestamp(0)));
 
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("FIRST_CROP_RECT").packets;
+      runner->Outputs().Tag(kFirstCropRectTag).packets;
   ASSERT_EQ(output_packets.size(), 1);
   const auto& rect = output_packets[0].Get<mediapipe::NormalizedRect>();
   EXPECT_EQ(rect.x_center(), 0);
@@ -951,7 +1000,7 @@ TEST(ContentZoomingCalculatorTest, ProvidesConstantFirstRect) {
                         runner.get());
   MP_ASSERT_OK(runner->Run());
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("FIRST_CROP_RECT").packets;
+      runner->Outputs().Tag(kFirstCropRectTag).packets;
   ASSERT_EQ(output_packets.size(), 4);
   const auto& first_rect = output_packets[0].Get<mediapipe::NormalizedRect>();
   EXPECT_NEAR(first_rect.x_center(), 0.5, 0.05);

mediapipe/examples/desktop/autoflip/calculators/face_box_adjuster_calculator.proto

@@ -64,7 +64,7 @@ message FaceBoxAdjusterCalculatorOptions {
 
   // Max value of head motion (max of current or history) to be considered still
   // stable.
-  optional float head_motion_threshold = 14 [default = 10.0];
+  optional float head_motion_threshold = 14 [default = 360.0];
 
   // The max amount of time to use an old eye distance when the face look angle
   // is unstable.

mediapipe/examples/desktop/autoflip/calculators/face_to_region_calculator.cc

@@ -32,6 +32,10 @@
 namespace mediapipe {
 namespace autoflip {
 
+constexpr char kRegionsTag[] = "REGIONS";
+constexpr char kFacesTag[] = "FACES";
+constexpr char kVideoTag[] = "VIDEO";
+
 // This calculator converts detected faces to SalientRegion protos that can be
 // used for downstream processing. Each SalientRegion is scored using image
 // cues. Scoring can be controlled through
@@ -80,17 +84,17 @@ FaceToRegionCalculator::FaceToRegionCalculator() {}
 
 absl::Status FaceToRegionCalculator::GetContract(
     mediapipe::CalculatorContract* cc) {
-  if (cc->Inputs().HasTag("VIDEO")) {
+  if (cc->Inputs().HasTag(kVideoTag)) {
-    cc->Inputs().Tag("VIDEO").Set<ImageFrame>();
+    cc->Inputs().Tag(kVideoTag).Set<ImageFrame>();
   }
-  cc->Inputs().Tag("FACES").Set<std::vector<mediapipe::Detection>>();
+  cc->Inputs().Tag(kFacesTag).Set<std::vector<mediapipe::Detection>>();
-  cc->Outputs().Tag("REGIONS").Set<DetectionSet>();
+  cc->Outputs().Tag(kRegionsTag).Set<DetectionSet>();
   return absl::OkStatus();
 }
 
 absl::Status FaceToRegionCalculator::Open(mediapipe::CalculatorContext* cc) {
   options_ = cc->Options<FaceToRegionCalculatorOptions>();
-  if (!cc->Inputs().HasTag("VIDEO")) {
+  if (!cc->Inputs().HasTag(kVideoTag)) {
     RET_CHECK(!options_.use_visual_scorer())
         << "VIDEO input must be provided when using visual_scorer.";
     RET_CHECK(!options_.export_individual_face_landmarks())
@@ -146,24 +150,24 @@ void FaceToRegionCalculator::ExtendSalientRegionWithPoint(
 }
 
 absl::Status FaceToRegionCalculator::Process(mediapipe::CalculatorContext* cc) {
-  if (cc->Inputs().HasTag("VIDEO") &&
+  if (cc->Inputs().HasTag(kVideoTag) &&
-      cc->Inputs().Tag("VIDEO").Value().IsEmpty()) {
+      cc->Inputs().Tag(kVideoTag).Value().IsEmpty()) {
     return mediapipe::UnknownErrorBuilder(MEDIAPIPE_LOC)
            << "No VIDEO input at time " << cc->InputTimestamp().Seconds();
   }
 
   cv::Mat frame;
-  if (cc->Inputs().HasTag("VIDEO")) {
+  if (cc->Inputs().HasTag(kVideoTag)) {
     frame = mediapipe::formats::MatView(
-        &cc->Inputs().Tag("VIDEO").Get<ImageFrame>());
+        &cc->Inputs().Tag(kVideoTag).Get<ImageFrame>());
     frame_width_ = frame.cols;
     frame_height_ = frame.rows;
   }
 
   auto region_set = ::absl::make_unique<DetectionSet>();
-  if (!cc->Inputs().Tag("FACES").Value().IsEmpty()) {
+  if (!cc->Inputs().Tag(kFacesTag).Value().IsEmpty()) {
     const auto& input_faces =
-        cc->Inputs().Tag("FACES").Get<std::vector<mediapipe::Detection>>();
+        cc->Inputs().Tag(kFacesTag).Get<std::vector<mediapipe::Detection>>();
 
     for (const auto& input_face : input_faces) {
       RET_CHECK(input_face.location_data().format() ==
@@ -276,7 +280,9 @@ absl::Status FaceToRegionCalculator::Process(mediapipe::CalculatorContext* cc) {
       }
     }
   }
-  cc->Outputs().Tag("REGIONS").Add(region_set.release(), cc->InputTimestamp());
+  cc->Outputs()
+      .Tag(kRegionsTag)
+      .Add(region_set.release(), cc->InputTimestamp());
 
   return absl::OkStatus();
 }

mediapipe/examples/desktop/autoflip/calculators/face_to_region_calculator_test.cc

@@ -33,6 +33,10 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kRegionsTag[] = "REGIONS";
+constexpr char kFacesTag[] = "FACES";
+constexpr char kVideoTag[] = "VIDEO";
+
 const char kConfig[] = R"(
     calculator: "FaceToRegionCalculator"
     input_stream: "VIDEO:frames"
@@ -100,7 +104,7 @@ void SetInputs(const std::vector<std::string>& faces, const bool include_video,
   if (include_video) {
     auto input_frame =
         ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, 800, 600);
-    runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+    runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
         Adopt(input_frame.release()).At(Timestamp::PostStream()));
   }
   // Setup two faces as input.
@@ -109,7 +113,7 @@ void SetInputs(const std::vector<std::string>& faces, const bool include_video,
   for (const auto& face : faces) {
     input_faces->push_back(ParseTextProtoOrDie<Detection>(face));
   }
-  runner->MutableInputs()->Tag("FACES").packets.push_back(
+  runner->MutableInputs()->Tag(kFacesTag).packets.push_back(
       Adopt(input_faces.release()).At(Timestamp::PostStream()));
 }
 
@@ -144,7 +148,7 @@ TEST(FaceToRegionCalculatorTest, FaceFullTypeSize) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
 
   const auto& regions = output_packets[0].Get<DetectionSet>();
@@ -177,7 +181,7 @@ TEST(FaceToRegionCalculatorTest, FaceLandmarksTypeSize) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
 
   const auto& regions = output_packets[0].Get<DetectionSet>();
@@ -208,7 +212,7 @@ TEST(FaceToRegionCalculatorTest, FaceLandmarksBox) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
 
   const auto& regions = output_packets[0].Get<DetectionSet>();
@@ -243,7 +247,7 @@ TEST(FaceToRegionCalculatorTest, FaceScore) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& regions = output_packets[0].Get<DetectionSet>();
   ASSERT_EQ(1, regions.detections().size());
@@ -292,7 +296,7 @@ TEST(FaceToRegionCalculatorTest, FaceNoVideoPass) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
 
   const auto& regions = output_packets[0].Get<DetectionSet>();

mediapipe/examples/desktop/autoflip/calculators/localization_to_region_calculator.cc

@@ -52,6 +52,9 @@ LocalizationToRegionCalculator::LocalizationToRegionCalculator() {}
 
 namespace {
 
+constexpr char kRegionsTag[] = "REGIONS";
+constexpr char kDetectionsTag[] = "DETECTIONS";
+
 // Converts an object detection to a autoflip SignalType.  Returns true if the
 // std::string label has a autoflip label.
 bool MatchType(const std::string& label, SignalType* type) {
@@ -86,8 +89,8 @@ void FillSalientRegion(const mediapipe::Detection& detection,
 
 absl::Status LocalizationToRegionCalculator::GetContract(
     mediapipe::CalculatorContract* cc) {
-  cc->Inputs().Tag("DETECTIONS").Set<std::vector<mediapipe::Detection>>();
+  cc->Inputs().Tag(kDetectionsTag).Set<std::vector<mediapipe::Detection>>();
-  cc->Outputs().Tag("REGIONS").Set<DetectionSet>();
+  cc->Outputs().Tag(kRegionsTag).Set<DetectionSet>();
   return absl::OkStatus();
 }
 
@@ -101,7 +104,7 @@ absl::Status LocalizationToRegionCalculator::Open(
 absl::Status LocalizationToRegionCalculator::Process(
     mediapipe::CalculatorContext* cc) {
   const auto& annotations =
-      cc->Inputs().Tag("DETECTIONS").Get<std::vector<mediapipe::Detection>>();
+      cc->Inputs().Tag(kDetectionsTag).Get<std::vector<mediapipe::Detection>>();
   auto regions = ::absl::make_unique<DetectionSet>();
   for (const auto& detection : annotations) {
     RET_CHECK_EQ(detection.label().size(), 1)
@@ -118,7 +121,7 @@ absl::Status LocalizationToRegionCalculator::Process(
     }
   }
 
-  cc->Outputs().Tag("REGIONS").Add(regions.release(), cc->InputTimestamp());
+  cc->Outputs().Tag(kRegionsTag).Add(regions.release(), cc->InputTimestamp());
   return absl::OkStatus();
 }
 

mediapipe/examples/desktop/autoflip/calculators/localization_to_region_calculator_test.cc

@@ -31,6 +31,9 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kRegionsTag[] = "REGIONS";
+constexpr char kDetectionsTag[] = "DETECTIONS";
+
 const char kConfig[] = R"(
     calculator: "LocalizationToRegionCalculator"
     input_stream: "DETECTIONS:detections"
@@ -81,7 +84,7 @@ void SetInputs(CalculatorRunner* runner,
     inputs->push_back(ParseTextProtoOrDie<Detection>(detection));
   }
   runner->MutableInputs()
-      ->Tag("DETECTIONS")
+      ->Tag(kDetectionsTag)
       .packets.push_back(Adopt(inputs.release()).At(Timestamp::PostStream()));
 }
 
@@ -109,7 +112,7 @@ TEST(LocalizationToRegionCalculatorTest, StandardTypes) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& regions = output_packets[0].Get<DetectionSet>();
   ASSERT_EQ(2, regions.detections().size());
@@ -137,7 +140,7 @@ TEST(LocalizationToRegionCalculatorTest, AllTypes) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& regions = output_packets[0].Get<DetectionSet>();
   ASSERT_EQ(3, regions.detections().size());
@@ -153,7 +156,7 @@ TEST(LocalizationToRegionCalculatorTest, BothTypes) {
 
   // Check the output regions.
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("REGIONS").packets;
+      runner->Outputs().Tag(kRegionsTag).packets;
   ASSERT_EQ(1, output_packets.size());
   const auto& regions = output_packets[0].Get<DetectionSet>();
   ASSERT_EQ(5, regions.detections().size());

mediapipe/examples/desktop/autoflip/calculators/scene_cropping_calculator_test.cc

@@ -34,6 +34,23 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kFramingDetectionsVizFramesTag[] =
+    "FRAMING_DETECTIONS_VIZ_FRAMES";
+constexpr char kExternalRenderingFullVidTag[] = "EXTERNAL_RENDERING_FULL_VID";
+constexpr char kExternalRenderingPerFrameTag[] = "EXTERNAL_RENDERING_PER_FRAME";
+constexpr char kCroppingSummaryTag[] = "CROPPING_SUMMARY";
+constexpr char kSalientPointFrameVizFramesTag[] =
+    "SALIENT_POINT_FRAME_VIZ_FRAMES";
+constexpr char kKeyFrameCropRegionVizFramesTag[] =
+    "KEY_FRAME_CROP_REGION_VIZ_FRAMES";
+constexpr char kCroppedFramesTag[] = "CROPPED_FRAMES";
+constexpr char kShotBoundariesTag[] = "SHOT_BOUNDARIES";
+constexpr char kStaticFeaturesTag[] = "STATIC_FEATURES";
+constexpr char kVideoSizeTag[] = "VIDEO_SIZE";
+constexpr char kVideoFramesTag[] = "VIDEO_FRAMES";
+constexpr char kDetectionFeaturesTag[] = "DETECTION_FEATURES";
+constexpr char kKeyFramesTag[] = "KEY_FRAMES";
+
 using ::testing::HasSubstr;
 
 constexpr char kConfig[] = R"(
@@ -241,10 +258,10 @@ void AddKeyFrameFeatures(const int64 time_ms, const int key_frame_width,
                          const int key_frame_height, bool randomize,
                          CalculatorRunner::StreamContentsSet* inputs) {
   Timestamp timestamp(time_ms);
-  if (inputs->HasTag("KEY_FRAMES")) {
+  if (inputs->HasTag(kKeyFramesTag)) {
     auto key_frame = MakeImageFrameFromColor(GetRandomColor(), key_frame_width,
                                              key_frame_height);
-    inputs->Tag("KEY_FRAMES")
+    inputs->Tag(kKeyFramesTag)
         .packets.push_back(Adopt(key_frame.release()).At(timestamp));
   }
   if (randomize) {
@@ -252,11 +269,11 @@ void AddKeyFrameFeatures(const int64 time_ms, const int key_frame_width,
         kMinNumDetections, kMaxNumDetections)(GetGen());
     auto detections =
         MakeDetections(num_detections, key_frame_width, key_frame_height);
-    inputs->Tag("DETECTION_FEATURES")
+    inputs->Tag(kDetectionFeaturesTag)
         .packets.push_back(Adopt(detections.release()).At(timestamp));
   } else {
     auto detections = MakeCenterDetection(key_frame_width, key_frame_height);
-    inputs->Tag("DETECTION_FEATURES")
+    inputs->Tag(kDetectionFeaturesTag)
         .packets.push_back(Adopt(detections.release()).At(timestamp));
   }
 }
@@ -272,19 +289,19 @@ void AddScene(const int start_frame_index, const int num_scene_frames,
   int64 time_ms = start_frame_index * kTimestampDiff;
   for (int i = 0; i < num_scene_frames; ++i) {
     Timestamp timestamp(time_ms);
-    if (inputs->HasTag("VIDEO_FRAMES")) {
+    if (inputs->HasTag(kVideoFramesTag)) {
       auto frame =
           MakeImageFrameFromColor(GetRandomColor(), frame_width, frame_height);
-      inputs->Tag("VIDEO_FRAMES")
+      inputs->Tag(kVideoFramesTag)
           .packets.push_back(Adopt(frame.release()).At(timestamp));
     } else {
       auto input_size =
           ::absl::make_unique<std::pair<int, int>>(frame_width, frame_height);
-      inputs->Tag("VIDEO_SIZE")
+      inputs->Tag(kVideoSizeTag)
           .packets.push_back(Adopt(input_size.release()).At(timestamp));
     }
     auto static_features = absl::make_unique<StaticFeatures>();
-    inputs->Tag("STATIC_FEATURES")
+    inputs->Tag(kStaticFeaturesTag)
         .packets.push_back(Adopt(static_features.release()).At(timestamp));
     if (DownSampleRate == 1) {
       AddKeyFrameFeatures(time_ms, key_frame_width, key_frame_height, false,
@@ -294,7 +311,7 @@ void AddScene(const int start_frame_index, const int num_scene_frames,
                           inputs);
     }
     if (i == num_scene_frames - 1) {  // adds shot boundary
-      inputs->Tag("SHOT_BOUNDARIES")
+      inputs->Tag(kShotBoundariesTag)
           .packets.push_back(Adopt(new bool(true)).At(Timestamp(time_ms)));
     }
     time_ms += kTimestampDiff;
@@ -306,8 +323,8 @@ void AddScene(const int start_frame_index, const int num_scene_frames,
 void CheckCroppedFrames(const CalculatorRunner& runner, const int num_frames,
                         const int target_width, const int target_height) {
   const auto& outputs = runner.Outputs();
-  EXPECT_TRUE(outputs.HasTag("CROPPED_FRAMES"));
+  EXPECT_TRUE(outputs.HasTag(kCroppedFramesTag));
-  const auto& cropped_frames_outputs = outputs.Tag("CROPPED_FRAMES").packets;
+  const auto& cropped_frames_outputs = outputs.Tag(kCroppedFramesTag).packets;
   EXPECT_EQ(cropped_frames_outputs.size(), num_frames);
   for (int i = 0; i < num_frames; ++i) {
     const auto& cropped_frame = cropped_frames_outputs[i].Get<ImageFrame>();
@@ -392,23 +409,23 @@ TEST(SceneCroppingCalculatorTest, OutputsDebugStreams) {
 
   MP_EXPECT_OK(runner->Run());
   const auto& outputs = runner->Outputs();
-  EXPECT_TRUE(outputs.HasTag("KEY_FRAME_CROP_REGION_VIZ_FRAMES"));
+  EXPECT_TRUE(outputs.HasTag(kKeyFrameCropRegionVizFramesTag));
-  EXPECT_TRUE(outputs.HasTag("SALIENT_POINT_FRAME_VIZ_FRAMES"));
+  EXPECT_TRUE(outputs.HasTag(kSalientPointFrameVizFramesTag));
-  EXPECT_TRUE(outputs.HasTag("CROPPING_SUMMARY"));
+  EXPECT_TRUE(outputs.HasTag(kCroppingSummaryTag));
-  EXPECT_TRUE(outputs.HasTag("EXTERNAL_RENDERING_PER_FRAME"));
+  EXPECT_TRUE(outputs.HasTag(kExternalRenderingPerFrameTag));
-  EXPECT_TRUE(outputs.HasTag("EXTERNAL_RENDERING_FULL_VID"));
+  EXPECT_TRUE(outputs.HasTag(kExternalRenderingFullVidTag));
-  EXPECT_TRUE(outputs.HasTag("FRAMING_DETECTIONS_VIZ_FRAMES"));
+  EXPECT_TRUE(outputs.HasTag(kFramingDetectionsVizFramesTag));
   const auto& crop_region_viz_frames_outputs =
-      outputs.Tag("KEY_FRAME_CROP_REGION_VIZ_FRAMES").packets;
+      outputs.Tag(kKeyFrameCropRegionVizFramesTag).packets;
   const auto& salient_point_viz_frames_outputs =
-      outputs.Tag("SALIENT_POINT_FRAME_VIZ_FRAMES").packets;
+      outputs.Tag(kSalientPointFrameVizFramesTag).packets;
-  const auto& summary_output = outputs.Tag("CROPPING_SUMMARY").packets;
+  const auto& summary_output = outputs.Tag(kCroppingSummaryTag).packets;
   const auto& ext_render_per_frame =
-      outputs.Tag("EXTERNAL_RENDERING_PER_FRAME").packets;
+      outputs.Tag(kExternalRenderingPerFrameTag).packets;
   const auto& ext_render_full_vid =
-      outputs.Tag("EXTERNAL_RENDERING_FULL_VID").packets;
+      outputs.Tag(kExternalRenderingFullVidTag).packets;
   const auto& framing_viz_frames_output =
-      outputs.Tag("FRAMING_DETECTIONS_VIZ_FRAMES").packets;
+      outputs.Tag(kFramingDetectionsVizFramesTag).packets;
   EXPECT_EQ(crop_region_viz_frames_outputs.size(), num_frames);
   EXPECT_EQ(salient_point_viz_frames_outputs.size(), num_frames);
   EXPECT_EQ(framing_viz_frames_output.size(), num_frames);
@@ -597,7 +614,7 @@ TEST(SceneCroppingCalculatorTest, ProducesEvenFrameSize) {
                  kKeyFrameHeight, kDownSampleRate, runner->MutableInputs());
         MP_EXPECT_OK(runner->Run());
         const auto& output_frame = runner->Outputs()
-                                       .Tag("CROPPED_FRAMES")
+                                       .Tag(kCroppedFramesTag)
                                        .packets[0]
                                        .Get<ImageFrame>();
         EXPECT_EQ(output_frame.Width() % 2, 0);
@@ -646,7 +663,7 @@ TEST(SceneCroppingCalculatorTest, PadsWithSolidColorFromStaticFeatures) {
     Timestamp timestamp(time_ms);
     auto frame =
         MakeImageFrameFromColor(GetRandomColor(), input_width, input_height);
-    inputs->Tag("VIDEO_FRAMES")
+    inputs->Tag(kVideoFramesTag)
         .packets.push_back(Adopt(frame.release()).At(timestamp));
     if (i % static_features_downsample_rate == 0) {
       auto static_features = absl::make_unique<StaticFeatures>();
@@ -657,7 +674,7 @@ TEST(SceneCroppingCalculatorTest, PadsWithSolidColorFromStaticFeatures) {
         color->set_g(green);
         color->set_b(red);
       }
-      inputs->Tag("STATIC_FEATURES")
+      inputs->Tag(kStaticFeaturesTag)
           .packets.push_back(Adopt(static_features.release()).At(timestamp));
       num_static_features++;
     }
@@ -672,7 +689,7 @@ TEST(SceneCroppingCalculatorTest, PadsWithSolidColorFromStaticFeatures) {
       location->set_y(0);
       location->set_width(80);
       location->set_height(input_height);
-      inputs->Tag("DETECTION_FEATURES")
+      inputs->Tag(kDetectionFeaturesTag)
           .packets.push_back(Adopt(detections.release()).At(timestamp));
     }
     time_ms += kTimestampDiff;
@@ -683,7 +700,7 @@ TEST(SceneCroppingCalculatorTest, PadsWithSolidColorFromStaticFeatures) {
   // Checks that the top and bottom borders indeed have the background color.
   const int border_size = 37;
   const auto& cropped_frames_outputs =
-      runner->Outputs().Tag("CROPPED_FRAMES").packets;
+      runner->Outputs().Tag(kCroppedFramesTag).packets;
   EXPECT_EQ(cropped_frames_outputs.size(), kSceneSize);
   for (int i = 0; i < kSceneSize; ++i) {
     const auto& cropped_frame = cropped_frames_outputs[i].Get<ImageFrame>();
@@ -727,7 +744,7 @@ TEST(SceneCroppingCalculatorTest, RemovesStaticBorders) {
   auto mat = formats::MatView(frame.get());
   mat(top_border_rect) = border_color;
   mat(bottom_border_rect) = border_color;
-  inputs->Tag("VIDEO_FRAMES")
+  inputs->Tag(kVideoFramesTag)
       .packets.push_back(Adopt(frame.release()).At(timestamp));
   // Set borders in static features.
   auto static_features = absl::make_unique<StaticFeatures>();
@@ -737,11 +754,11 @@ TEST(SceneCroppingCalculatorTest, RemovesStaticBorders) {
   auto* bottom_part = static_features->add_border();
   bottom_part->set_relative_position(Border::BOTTOM);
   bottom_part->mutable_border_position()->set_height(bottom_border_size);
-  inputs->Tag("STATIC_FEATURES")
+  inputs->Tag(kStaticFeaturesTag)
       .packets.push_back(Adopt(static_features.release()).At(timestamp));
   // Add empty detections to ensure no padding is used.
   auto detections = absl::make_unique<DetectionSet>();
-  inputs->Tag("DETECTION_FEATURES")
+  inputs->Tag(kDetectionFeaturesTag)
       .packets.push_back(Adopt(detections.release()).At(timestamp));
 
   MP_EXPECT_OK(runner->Run());
@@ -749,7 +766,7 @@ TEST(SceneCroppingCalculatorTest, RemovesStaticBorders) {
   // Checks that the top and bottom borders are removed. Each frame should have
   // solid color equal to frame color.
   const auto& cropped_frames_outputs =
-      runner->Outputs().Tag("CROPPED_FRAMES").packets;
+      runner->Outputs().Tag(kCroppedFramesTag).packets;
   EXPECT_EQ(cropped_frames_outputs.size(), 1);
   const auto& cropped_frame = cropped_frames_outputs[0].Get<ImageFrame>();
   const auto cropped_mat = formats::MatView(&cropped_frame);
@@ -775,7 +792,7 @@ TEST(SceneCroppingCalculatorTest, OutputsCropMessagePolyPath) {
   MP_EXPECT_OK(runner->Run());
   const auto& outputs = runner->Outputs();
   const auto& ext_render_per_frame =
-      outputs.Tag("EXTERNAL_RENDERING_PER_FRAME").packets;
+      outputs.Tag(kExternalRenderingPerFrameTag).packets;
   EXPECT_EQ(ext_render_per_frame.size(), num_frames);
 
   for (int i = 0; i < num_frames - 1; ++i) {
@@ -813,7 +830,7 @@ TEST(SceneCroppingCalculatorTest, OutputsCropMessageKinematicPath) {
   MP_EXPECT_OK(runner->Run());
   const auto& outputs = runner->Outputs();
   const auto& ext_render_per_frame =
-      outputs.Tag("EXTERNAL_RENDERING_PER_FRAME").packets;
+      outputs.Tag(kExternalRenderingPerFrameTag).packets;
   EXPECT_EQ(ext_render_per_frame.size(), num_frames);
 
   for (int i = 0; i < num_frames - 1; ++i) {
@@ -846,7 +863,7 @@ TEST(SceneCroppingCalculatorTest, OutputsCropMessagePolyPathNoVideo) {
   MP_EXPECT_OK(runner->Run());
   const auto& outputs = runner->Outputs();
   const auto& ext_render_per_frame =
-      outputs.Tag("EXTERNAL_RENDERING_PER_FRAME").packets;
+      outputs.Tag(kExternalRenderingPerFrameTag).packets;
   EXPECT_EQ(ext_render_per_frame.size(), num_frames);
 
   for (int i = 0; i < num_frames - 1; ++i) {
@@ -886,7 +903,7 @@ TEST(SceneCroppingCalculatorTest, OutputsCropMessageKinematicPathNoVideo) {
   MP_EXPECT_OK(runner->Run());
   const auto& outputs = runner->Outputs();
   const auto& ext_render_per_frame =
-      outputs.Tag("EXTERNAL_RENDERING_PER_FRAME").packets;
+      outputs.Tag(kExternalRenderingPerFrameTag).packets;
   EXPECT_EQ(ext_render_per_frame.size(), num_frames);
 
   for (int i = 0; i < num_frames - 1; ++i) {

mediapipe/examples/desktop/autoflip/calculators/shot_boundary_calculator_test.cc

@@ -43,6 +43,9 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kIsShotChangeTag[] = "IS_SHOT_CHANGE";
+constexpr char kVideoTag[] = "VIDEO";
+
 const char kConfig[] = R"(
     calculator: "ShotBoundaryCalculator"
     input_stream: "VIDEO:camera_frames"
@@ -70,7 +73,7 @@ void AddFrames(const int number_of_frames, const std::set<int>& skip_frames,
     if (skip_frames.count(i) < 1) {
       sub_image.copyTo(frame_area);
     }
-    runner->MutableInputs()->Tag("VIDEO").packets.push_back(
+    runner->MutableInputs()->Tag(kVideoTag).packets.push_back(
         Adopt(input_frame.release()).At(Timestamp(i * 1000000)));
   }
 }
@@ -97,7 +100,7 @@ TEST(ShotBoundaryCalculatorTest, NoShotChange) {
 
   AddFrames(10, {}, runner.get());
   MP_ASSERT_OK(runner->Run());
-  CheckOutput(10, {}, runner->Outputs().Tag("IS_SHOT_CHANGE").packets);
+  CheckOutput(10, {}, runner->Outputs().Tag(kIsShotChangeTag).packets);
 }
 
 TEST(ShotBoundaryCalculatorTest, ShotChangeSingle) {
@@ -110,7 +113,7 @@ TEST(ShotBoundaryCalculatorTest, ShotChangeSingle) {
 
   AddFrames(20, {10}, runner.get());
   MP_ASSERT_OK(runner->Run());
-  CheckOutput(20, {10}, runner->Outputs().Tag("IS_SHOT_CHANGE").packets);
+  CheckOutput(20, {10}, runner->Outputs().Tag(kIsShotChangeTag).packets);
 }
 
 TEST(ShotBoundaryCalculatorTest, ShotChangeDouble) {
@@ -123,7 +126,7 @@ TEST(ShotBoundaryCalculatorTest, ShotChangeDouble) {
 
   AddFrames(20, {14, 17}, runner.get());
   MP_ASSERT_OK(runner->Run());
-  CheckOutput(20, {14, 17}, runner->Outputs().Tag("IS_SHOT_CHANGE").packets);
+  CheckOutput(20, {14, 17}, runner->Outputs().Tag(kIsShotChangeTag).packets);
 }
 
 TEST(ShotBoundaryCalculatorTest, ShotChangeFiltered) {
@@ -140,7 +143,7 @@ TEST(ShotBoundaryCalculatorTest, ShotChangeFiltered) {
 
   AddFrames(24, {16, 19}, runner.get());
   MP_ASSERT_OK(runner->Run());
-  CheckOutput(24, {16}, runner->Outputs().Tag("IS_SHOT_CHANGE").packets);
+  CheckOutput(24, {16}, runner->Outputs().Tag(kIsShotChangeTag).packets);
 }
 
 TEST(ShotBoundaryCalculatorTest, ShotChangeSingleOnOnChange) {
@@ -153,7 +156,7 @@ TEST(ShotBoundaryCalculatorTest, ShotChangeSingleOnOnChange) {
 
   AddFrames(20, {15}, runner.get());
   MP_ASSERT_OK(runner->Run());
-  auto output_packets = runner->Outputs().Tag("IS_SHOT_CHANGE").packets;
+  auto output_packets = runner->Outputs().Tag(kIsShotChangeTag).packets;
   ASSERT_EQ(output_packets.size(), 1);
   ASSERT_EQ(output_packets[0].Get<bool>(), true);
   ASSERT_EQ(output_packets[0].Timestamp().Value(), 15000000);

mediapipe/examples/desktop/autoflip/calculators/signal_fusing_calculator_test.cc

@@ -32,6 +32,9 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kOutputTag[] = "OUTPUT";
+constexpr char kIsShotBoundaryTag[] = "IS_SHOT_BOUNDARY";
+
 const char kConfigA[] = R"(
     calculator: "SignalFusingCalculator"
     input_stream: "scene_change"
@@ -160,7 +163,7 @@ TEST(SignalFusingCalculatorTest, TwoInputShotLabeledTags) {
 
   auto input_shot = absl::make_unique<bool>(false);
   runner->MutableInputs()
-      ->Tag("IS_SHOT_BOUNDARY")
+      ->Tag(kIsShotBoundaryTag)
       .packets.push_back(Adopt(input_shot.release()).At(Timestamp(0)));
 
   auto input_face =
@@ -200,7 +203,7 @@ TEST(SignalFusingCalculatorTest, TwoInputShotLabeledTags) {
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("OUTPUT").packets;
+      runner->Outputs().Tag(kOutputTag).packets;
   const auto& detection_set = output_packets[0].Get<DetectionSet>();
 
   ASSERT_EQ(detection_set.detections().size(), 4);
@@ -251,7 +254,7 @@ TEST(SignalFusingCalculatorTest, TwoInputNoShotLabeledTags) {
   MP_ASSERT_OK(runner->Run());
 
   const std::vector<Packet>& output_packets =
-      runner->Outputs().Tag("OUTPUT").packets;
+      runner->Outputs().Tag(kOutputTag).packets;
   const auto& detection_set = output_packets[0].Get<DetectionSet>();
 
   ASSERT_EQ(detection_set.detections().size(), 4);

mediapipe/examples/desktop/autoflip/calculators/video_filtering_calculator_test.cc

@@ -31,6 +31,9 @@ namespace mediapipe {
 namespace autoflip {
 namespace {
 
+constexpr char kOutputFramesTag[] = "OUTPUT_FRAMES";
+constexpr char kInputFramesTag[] = "INPUT_FRAMES";
+
 // Default configuration of the calculator.
 CalculatorGraphConfig::Node GetCalculatorNode(
     const std::string& fail_if_any, const std::string& extra_options = "") {
@@ -65,10 +68,10 @@ TEST(VideoFilterCalculatorTest, UpperBoundNoPass) {
       ImageFormat::SRGB, kFixedWidth,
       static_cast<int>(kFixedWidth / kAspectRatio), 16);
   runner->MutableInputs()
-      ->Tag("INPUT_FRAMES")
+      ->Tag(kInputFramesTag)
       .packets.push_back(Adopt(input_frame.release()).At(Timestamp(1000)));
   MP_ASSERT_OK(runner->Run());
-  const auto& output_packet = runner->Outputs().Tag("OUTPUT_FRAMES").packets;
+  const auto& output_packet = runner->Outputs().Tag(kOutputFramesTag).packets;
   EXPECT_TRUE(output_packet.empty());
 }
 
@@ -88,10 +91,10 @@ TEST(VerticalFrameRemovalCalculatorTest, UpperBoundPass) {
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, kWidth, kHeight, 16);
   runner->MutableInputs()
-      ->Tag("INPUT_FRAMES")
+      ->Tag(kInputFramesTag)
       .packets.push_back(Adopt(input_frame.release()).At(Timestamp(1000)));
   MP_ASSERT_OK(runner->Run());
-  const auto& output_packet = runner->Outputs().Tag("OUTPUT_FRAMES").packets;
+  const auto& output_packet = runner->Outputs().Tag(kOutputFramesTag).packets;
   EXPECT_EQ(1, output_packet.size());
   auto& output_frame = output_packet[0].Get<ImageFrame>();
   EXPECT_EQ(kWidth, output_frame.Width());
@@ -114,10 +117,10 @@ TEST(VideoFilterCalculatorTest, LowerBoundNoPass) {
       ImageFormat::SRGB, kFixedWidth,
       static_cast<int>(kFixedWidth / kAspectRatio), 16);
   runner->MutableInputs()
-      ->Tag("INPUT_FRAMES")
+      ->Tag(kInputFramesTag)
       .packets.push_back(Adopt(input_frame.release()).At(Timestamp(1000)));
   MP_ASSERT_OK(runner->Run());
-  const auto& output_packet = runner->Outputs().Tag("OUTPUT_FRAMES").packets;
+  const auto& output_packet = runner->Outputs().Tag(kOutputFramesTag).packets;
   EXPECT_TRUE(output_packet.empty());
 }
 
@@ -137,10 +140,10 @@ TEST(VerticalFrameRemovalCalculatorTest, LowerBoundPass) {
   auto input_frame =
       ::absl::make_unique<ImageFrame>(ImageFormat::SRGB, kWidth, kHeight, 16);
   runner->MutableInputs()
-      ->Tag("INPUT_FRAMES")
+      ->Tag(kInputFramesTag)
       .packets.push_back(Adopt(input_frame.release()).At(Timestamp(1000)));
   MP_ASSERT_OK(runner->Run());
-  const auto& output_packet = runner->Outputs().Tag("OUTPUT_FRAMES").packets;
+  const auto& output_packet = runner->Outputs().Tag(kOutputFramesTag).packets;
   EXPECT_EQ(1, output_packet.size());
   auto& output_frame = output_packet[0].Get<ImageFrame>();
   EXPECT_EQ(kWidth, output_frame.Width());
@@ -164,7 +167,7 @@ TEST(VerticalFrameRemovalCalculatorTest, OutputError) {
       ImageFormat::SRGB, kFixedWidth,
       static_cast<int>(kFixedWidth / kAspectRatio), 16);
   runner->MutableInputs()
-      ->Tag("INPUT_FRAMES")
+      ->Tag(kInputFramesTag)
       .packets.push_back(Adopt(input_frame.release()).At(Timestamp(1000)));
   absl::Status status = runner->Run();
   EXPECT_EQ(status.code(), absl::StatusCode::kUnknown);

mediapipe/examples/desktop/autoflip/quality/kinematic_path_solver.cc

@@ -1,5 +1,7 @@
 #include "mediapipe/examples/desktop/autoflip/quality/kinematic_path_solver.h"
 
+constexpr float kMinVelocity = 0.5;
+
 namespace mediapipe {
 namespace autoflip {
 namespace {
@@ -75,6 +77,7 @@ absl::Status KinematicPathSolver::AddObservation(int position,
       current_position_px_ = position;
     }
     target_position_px_ = position;
+    prior_position_px_ = current_position_px_;
     motion_state_ = false;
     mean_delta_t_ = -1;
     raw_positions_at_time_.push_front(
@@ -106,6 +109,11 @@ absl::Status KinematicPathSolver::AddObservation(int position,
                    options_.reframe_window())
           << "Reframe window cannot exceed min_motion_to_reframe.";
     }
+    RET_CHECK(options_.has_max_velocity() ^
+              (options_.has_max_velocity_scale() &&
+               options_.has_max_velocity_shift()))
+        << "Must either set max_velocity or set both max_velocity_scale and "
+           "max_velocity_shift.";
     return absl::OkStatus();
   }
 
@@ -123,9 +131,29 @@ absl::Status KinematicPathSolver::AddObservation(int position,
   }
 
   int filtered_position = Median(raw_positions_at_time_);
+
+  float min_reframe = (options_.has_min_motion_to_reframe()
+                           ? options_.min_motion_to_reframe()
+                           : options_.min_motion_to_reframe_lower()) *
+                      pixels_per_degree_;
+  float max_reframe = (options_.has_min_motion_to_reframe()
+                           ? options_.min_motion_to_reframe()
+                           : options_.min_motion_to_reframe_upper()) *
+                      pixels_per_degree_;
+
+  filtered_position = fmax(min_location_ - min_reframe, filtered_position);
+  filtered_position = fmin(max_location_ + max_reframe, filtered_position);
+
   double delta_degs =
       (filtered_position - current_position_px_) / pixels_per_degree_;
 
+  double max_velocity =
+      options_.has_max_velocity()
+          ? options_.max_velocity()
+          : fmax(abs(delta_degs * options_.max_velocity_scale()) +
+                     options_.max_velocity_shift(),
+                 kMinVelocity);
+
   // If the motion is smaller than the min_motion_to_reframe and camera is
   // stationary, don't use the update.
   if (IsMotionTooSmall(delta_degs) && !motion_state_) {
@@ -169,10 +197,9 @@ absl::Status KinematicPathSolver::AddObservation(int position,
                                 options_.max_update_rate());
   double updated_velocity = current_velocity_deg_per_s_ * (1 - update_rate) +
                             observed_velocity * update_rate;
-  // Limited current velocity.
+  current_velocity_deg_per_s_ = updated_velocity > 0
-  current_velocity_deg_per_s_ =
+                                    ? fmin(updated_velocity, max_velocity)
-      updated_velocity > 0 ? fmin(updated_velocity, options_.max_velocity())
+                                    : fmax(updated_velocity, -max_velocity);
-                           : fmax(updated_velocity, -options_.max_velocity());
 
   // Update prediction based on time input.
   return UpdatePrediction(time_us);
@@ -182,6 +209,9 @@ absl::Status KinematicPathSolver::UpdatePrediction(const int64 time_us) {
   RET_CHECK(current_time_ < time_us)
       << "Prediction time added before a prior observation or prediction.";
 
+  // Store prior pixel location.
+  prior_position_px_ = current_position_px_;
+
   // Position update limited by min/max.
   double update_position_px =
       current_position_px_ +
@@ -209,7 +239,19 @@ absl::Status KinematicPathSolver::GetState(int* position) {
   return absl::OkStatus();
 }
 
-absl::Status KinematicPathSolver::SetState(const int position) {
+absl::Status KinematicPathSolver::GetState(float* position) {
+  RET_CHECK(initialized_) << "GetState called before first observation added.";
+  *position = current_position_px_;
+  return absl::OkStatus();
+}
+
+absl::Status KinematicPathSolver::GetDeltaState(float* delta_position) {
+  RET_CHECK(initialized_) << "GetState called before first observation added.";
+  *delta_position = current_position_px_ - prior_position_px_;
+  return absl::OkStatus();
+}
+
+absl::Status KinematicPathSolver::SetState(const float position) {
   RET_CHECK(initialized_) << "SetState called before first observation added.";
   current_position_px_ = position;
   return absl::OkStatus();
@@ -218,7 +260,15 @@ absl::Status KinematicPathSolver::SetState(const int position) {
 absl::Status KinematicPathSolver::GetTargetPosition(int* target_position) {
   RET_CHECK(initialized_)
       << "GetTargetPosition called before first observation added.";
+
+  // Provide target position clamped by min/max locations.
+  if (target_position_px_ < min_location_) {
+    *target_position = min_location_;
+  } else if (target_position_px_ > max_location_) {
+    *target_position = max_location_;
+  } else {
     *target_position = round(target_position_px_);
+  }
   return absl::OkStatus();
 }
 
@@ -238,6 +288,7 @@ absl::Status KinematicPathSolver::UpdateMinMaxLocation(const int min_location,
   double updated_distance = max_location - min_location;
   double scale_change = updated_distance / prior_distance;
   current_position_px_ = current_position_px_ * scale_change;
+  prior_position_px_ = prior_position_px_ * scale_change;
   target_position_px_ = target_position_px_ * scale_change;
   max_location_ = max_location;
   min_location_ = min_location;

mediapipe/examples/desktop/autoflip/quality/kinematic_path_solver.h

@@ -46,10 +46,12 @@ class KinematicPathSolver {
   absl::Status AddObservation(int position, const uint64 time_us);
   // Get the predicted position at a time.
   absl::Status UpdatePrediction(const int64 time_us);
-  // Get the state at a time.
+  // Get the state at a time, as an int.
   absl::Status GetState(int* position);
+  // Get the state at a time, as a float.
+  absl::Status GetState(float* position);
   // Overwrite the current state value.
-  absl::Status SetState(const int position);
+  absl::Status SetState(const float position);
   // Update PixelPerDegree value.
   absl::Status UpdatePixelsPerDegree(const float pixels_per_degree);
   // Provide the current target position of the reframe action.
@@ -66,6 +68,8 @@ class KinematicPathSolver {
   // Clear any history buffer of positions that are used when
   // filtering_time_window_us is set to a non-zero value.
   void ClearHistory();
+  // Provides the change in position from last state.
+  absl::Status GetDeltaState(float* delta_position);
 
  private:
   // Tuning options.
@@ -77,6 +81,7 @@ class KinematicPathSolver {
   float pixels_per_degree_;
   // Current state values.
   double current_position_px_;
+  double prior_position_px_;
   double current_velocity_deg_per_s_;
   uint64 current_time_;
   // History of observations (second) and their time (first).

mediapipe/examples/desktop/autoflip/quality/kinematic_path_solver.proto

@@ -6,8 +6,9 @@ message KinematicOptions {
   // Weighted update of new camera velocity (measurement) vs current state
   // (prediction).
   optional double update_rate = 1 [default = 0.5, deprecated = true];
-  // Max velocity (degrees per second) that the camera can move.
+  // Max velocity (degrees per second) that the camera can move.  Cannot be used
-  optional double max_velocity = 2 [default = 18];
+  // with max_velocity_scale or max_velocity_shift.
+  optional double max_velocity = 2;
   // Min motion (in degrees) to react for both upper and lower directions.  Must
   // not be set if using min_motion_to_reframe_lower and
   // min_motion_to_reframe_upper.
@@ -30,4 +31,12 @@ message KinematicOptions {
   optional int64 filtering_time_window_us = 7 [default = 0];
   // Weighted update of average period, used for motion updates.
   optional float mean_period_update_rate = 8 [default = 0.25];
+  // Scale factor for max velocity, to be multiplied by the distance from center
+  // in degrees.  Cannot be used with max_velocity and must be used with
+  // max_velocity_shift.
+  optional float max_velocity_scale = 11;
+  // Shift factor for max velocity, to be added to the scaled distance from
+  // center in degrees.  Cannot be used with max_velocity and must be used with
+  // max_velocity_scale.
+  optional float max_velocity_shift = 12;
 }

mediapipe/examples/desktop/autoflip/quality/kinematic_path_solver_test.cc

@@ -36,7 +36,7 @@ TEST(KinematicPathSolverTest, FailZeroPixelsPerDegree) {
 TEST(KinematicPathSolverTest, FailNotInitializedState) {
   KinematicOptions options;
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   EXPECT_FALSE(solver.GetState(&state).ok());
 }
 
@@ -55,13 +55,13 @@ TEST(KinematicPathSolverTest, PassNotEnoughMotionLargeImg) {
   options.set_max_velocity(1000);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move.
-  EXPECT_EQ(state, 500);
+  EXPECT_FLOAT_EQ(state, 500);
 }
 
 TEST(KinematicPathSolverTest, PassNotEnoughMotionSmallImg) {
@@ -72,13 +72,13 @@ TEST(KinematicPathSolverTest, PassNotEnoughMotionSmallImg) {
   options.set_max_velocity(500);
   // Set degrees / pixel to 8.3
   KinematicPathSolver solver(options, 0, 500, 500.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(400, kMicroSecInSec * 0));
   // Move target by 10px / 8.3 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(410, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move.
-  EXPECT_EQ(state, 400);
+  EXPECT_FLOAT_EQ(state, 400);
 }
 
 TEST(KinematicPathSolverTest, PassEnoughMotionFiltered) {
@@ -90,7 +90,7 @@ TEST(KinematicPathSolverTest, PassEnoughMotionFiltered) {
   options.set_filtering_time_window_us(3000000);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 1));
@@ -98,7 +98,7 @@ TEST(KinematicPathSolverTest, PassEnoughMotionFiltered) {
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 3));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move.
-  EXPECT_EQ(state, 500);
+  EXPECT_FLOAT_EQ(state, 500);
 }
 
 TEST(KinematicPathSolverTest, PassEnoughMotionNotFiltered) {
@@ -110,7 +110,7 @@ TEST(KinematicPathSolverTest, PassEnoughMotionNotFiltered) {
   options.set_filtering_time_window_us(0);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 1));
@@ -118,7 +118,7 @@ TEST(KinematicPathSolverTest, PassEnoughMotionNotFiltered) {
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 3));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move.
-  EXPECT_EQ(state, 506);
+  EXPECT_FLOAT_EQ(state, 506.4);
 }
 
 TEST(KinematicPathSolverTest, PassEnoughMotionLargeImg) {
@@ -130,13 +130,13 @@ TEST(KinematicPathSolverTest, PassEnoughMotionLargeImg) {
   options.set_max_velocity(1000);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move.
-  EXPECT_EQ(state, 520);
+  EXPECT_FLOAT_EQ(state, 520);
 }
 
 TEST(KinematicPathSolverTest, PassEnoughMotionSmallImg) {
@@ -148,13 +148,13 @@ TEST(KinematicPathSolverTest, PassEnoughMotionSmallImg) {
   options.set_max_velocity(18);
   // Set degrees / pixel to 8.3
   KinematicPathSolver solver(options, 0, 500, 500.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(400, kMicroSecInSec * 0));
   // Move target by 10px / 8.3 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(410, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move.
-  EXPECT_EQ(state, 410);
+  EXPECT_FLOAT_EQ(state, 410);
 }
 
 TEST(KinematicPathSolverTest, FailReframeWindowSetting) {
@@ -181,13 +181,13 @@ TEST(KinematicPathSolverTest, PassReframeWindow) {
   options.set_reframe_window(0.75);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move 1.2-.75 deg, * 16.6 = 7.47px + 500 =
-  EXPECT_EQ(state, 508);
+  EXPECT_FLOAT_EQ(state, 507.5);
 }
 
 TEST(KinematicPathSolverTest, PassReframeWindowLowerUpper) {
@@ -202,17 +202,17 @@ TEST(KinematicPathSolverTest, PassReframeWindowLowerUpper) {
   options.set_reframe_window(0.75);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move
-  EXPECT_EQ(state, 500);
+  EXPECT_FLOAT_EQ(state, 500);
   MP_ASSERT_OK(solver.AddObservation(480, kMicroSecInSec * 2));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move
-  EXPECT_EQ(state, 493);
+  EXPECT_FLOAT_EQ(state, 492.5);
 }
 
 TEST(KinematicPathSolverTest, PassCheckState) {
@@ -241,12 +241,12 @@ TEST(KinematicPathSolverTest, PassUpdateRate30FPS) {
   options.set_max_update_rate(0.8);
   options.set_max_velocity(18);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1 / 30));
   MP_ASSERT_OK(solver.GetState(&state));
   // (0.033 / .25) * 20 =
-  EXPECT_EQ(state, 503);
+  EXPECT_FLOAT_EQ(state, 502.6667);
 }
 
 TEST(KinematicPathSolverTest, PassUpdateRate10FPS) {
@@ -256,12 +256,12 @@ TEST(KinematicPathSolverTest, PassUpdateRate10FPS) {
   options.set_max_update_rate(0.8);
   options.set_max_velocity(18);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1 / 10));
   MP_ASSERT_OK(solver.GetState(&state));
   // (0.1 / .25) * 20 =
-  EXPECT_EQ(state, 508);
+  EXPECT_FLOAT_EQ(state, 508);
 }
 
 TEST(KinematicPathSolverTest, PassUpdateRate) {
@@ -271,7 +271,8 @@ TEST(KinematicPathSolverTest, PassUpdateRate) {
   options.set_max_update_rate(1.0);
   options.set_max_velocity(18);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state, target_position;
+  int target_position;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   MP_ASSERT_OK(solver.GetTargetPosition(&target_position));
   EXPECT_EQ(target_position, 500);
@@ -279,7 +280,7 @@ TEST(KinematicPathSolverTest, PassUpdateRate) {
   MP_ASSERT_OK(solver.GetTargetPosition(&target_position));
   EXPECT_EQ(target_position, 520);
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 505);
+  EXPECT_FLOAT_EQ(state, 505);
 }
 
 TEST(KinematicPathSolverTest, PassUpdateRateResolutionChange) {
@@ -289,7 +290,8 @@ TEST(KinematicPathSolverTest, PassUpdateRateResolutionChange) {
   options.set_max_update_rate(1.0);
   options.set_max_velocity(18);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state, target_position;
+  int target_position;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   MP_ASSERT_OK(solver.GetTargetPosition(&target_position));
   EXPECT_EQ(target_position, 500);
@@ -299,10 +301,10 @@ TEST(KinematicPathSolverTest, PassUpdateRateResolutionChange) {
   MP_ASSERT_OK(solver.GetTargetPosition(&target_position));
   EXPECT_EQ(target_position, 520 * 0.5);
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 253);
+  EXPECT_FLOAT_EQ(state, 252.5);
 }
 
-TEST(KinematicPathSolverTest, PassMaxVelocity) {
+TEST(KinematicPathSolverTest, PassMaxVelocityInt) {
   KinematicOptions options;
   options.set_min_motion_to_reframe(1.0);
   options.set_update_rate(1.0);
@@ -315,6 +317,33 @@ TEST(KinematicPathSolverTest, PassMaxVelocity) {
   EXPECT_EQ(state, 600);
 }
 
+TEST(KinematicPathSolverTest, PassMaxVelocity) {
+  KinematicOptions options;
+  options.set_min_motion_to_reframe(1.0);
+  options.set_update_rate(1.0);
+  options.set_max_velocity(6);
+  KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
+  float state;
+  MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
+  MP_ASSERT_OK(solver.AddObservation(1000, kMicroSecInSec * 1));
+  MP_ASSERT_OK(solver.GetState(&state));
+  EXPECT_FLOAT_EQ(state, 600);
+}
+
+TEST(KinematicPathSolverTest, PassMaxVelocityScale) {
+  KinematicOptions options;
+  options.set_min_motion_to_reframe(1.0);
+  options.set_update_rate(1.0);
+  options.set_max_velocity_scale(0.4);
+  options.set_max_velocity_shift(-2.0);
+  KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
+  float state;
+  MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
+  MP_ASSERT_OK(solver.AddObservation(1000, kMicroSecInSec * 1));
+  MP_ASSERT_OK(solver.GetState(&state));
+  EXPECT_FLOAT_EQ(state, 666.6667);
+}
+
 TEST(KinematicPathSolverTest, PassDegPerPxChange) {
   KinematicOptions options;
   // Set min motion to 2deg
@@ -323,18 +352,18 @@ TEST(KinematicPathSolverTest, PassDegPerPxChange) {
   options.set_max_velocity(1000);
   // Set degrees / pixel to 16.6
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, kMicroSecInSec * 0));
   // Move target by 20px / 16.6 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to not move.
-  EXPECT_EQ(state, 500);
+  EXPECT_FLOAT_EQ(state, 500);
   MP_ASSERT_OK(solver.UpdatePixelsPerDegree(500.0 / kWidthFieldOfView));
   MP_ASSERT_OK(solver.AddObservation(520, kMicroSecInSec * 2));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move.
-  EXPECT_EQ(state, 516);
+  EXPECT_FLOAT_EQ(state, 516);
 }
 
 TEST(KinematicPathSolverTest, NoTimestampSmoothing) {
@@ -344,14 +373,14 @@ TEST(KinematicPathSolverTest, NoTimestampSmoothing) {
   options.set_max_velocity(6);
   options.set_mean_period_update_rate(1.0);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, 0));
   MP_ASSERT_OK(solver.AddObservation(1000, 1000000));
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 600);
+  EXPECT_FLOAT_EQ(state, 600);
   MP_ASSERT_OK(solver.AddObservation(1000, 2200000));
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 720);
+  EXPECT_FLOAT_EQ(state, 720);
 }
 
 TEST(KinematicPathSolverTest, TimestampSmoothing) {
@@ -361,14 +390,14 @@ TEST(KinematicPathSolverTest, TimestampSmoothing) {
   options.set_max_velocity(6);
   options.set_mean_period_update_rate(0.05);
   KinematicPathSolver solver(options, 0, 1000, 1000.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(500, 0));
   MP_ASSERT_OK(solver.AddObservation(1000, 1000000));
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 600);
+  EXPECT_FLOAT_EQ(state, 600);
   MP_ASSERT_OK(solver.AddObservation(1000, 2200000));
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 701);
+  EXPECT_FLOAT_EQ(state, 701);
 }
 
 TEST(KinematicPathSolverTest, PassSetPosition) {
@@ -380,16 +409,30 @@ TEST(KinematicPathSolverTest, PassSetPosition) {
   options.set_max_velocity(18);
   // Set degrees / pixel to 8.3
   KinematicPathSolver solver(options, 0, 500, 500.0 / kWidthFieldOfView);
-  int state;
+  float state;
   MP_ASSERT_OK(solver.AddObservation(400, kMicroSecInSec * 0));
   // Move target by 10px / 8.3 = 1.2deg
   MP_ASSERT_OK(solver.AddObservation(410, kMicroSecInSec * 1));
   MP_ASSERT_OK(solver.GetState(&state));
   // Expect cam to move.
-  EXPECT_EQ(state, 410);
+  EXPECT_FLOAT_EQ(state, 410);
   MP_ASSERT_OK(solver.SetState(400));
   MP_ASSERT_OK(solver.GetState(&state));
-  EXPECT_EQ(state, 400);
+  EXPECT_FLOAT_EQ(state, 400);
+}
+TEST(KinematicPathSolverTest, PassBorderTest) {
+  KinematicOptions options;
+  options.set_min_motion_to_reframe(1.0);
+  options.set_max_update_rate(0.25);
+  options.set_max_velocity_scale(0.5);
+  options.set_max_velocity_shift(-1.0);
+
+  KinematicPathSolver solver(options, 0, 500, 500.0 / kWidthFieldOfView);
+  float state;
+  MP_ASSERT_OK(solver.AddObservation(400, kMicroSecInSec * 0));
+  MP_ASSERT_OK(solver.AddObservation(800, kMicroSecInSec * 0.1));
+  MP_ASSERT_OK(solver.GetState(&state));
+  EXPECT_FLOAT_EQ(state, 404.56668);
 }
 
 }  // namespace

mediapipe/framework/api2/builder.h

@@ -148,18 +148,18 @@ class SourceImpl {
 
   explicit SourceImpl(std::vector<std::unique_ptr<Base>>* vec)
       : SourceImpl(&GetWithAutoGrow(vec, 0)) {}
-  explicit SourceImpl(SourceBase* base) : base_(*base) {}
+  explicit SourceImpl(SourceBase* base) : base_(base) {}
 
   template <typename U,
             typename std::enable_if<AllowConnection<U>{}, int>::type = 0>
   Src& AddTarget(const Dst<U>& dest) {
     CHECK(dest.base_.source == nullptr);
-    dest.base_.source = &base_;
+    dest.base_.source = base_;
-    base_.dests_.emplace_back(&dest.base_);
+    base_->dests_.emplace_back(&dest.base_);
     return *this;
   }
   Src& SetName(std::string name) {
-    base_.name_ = std::move(name);
+    base_->name_ = std::move(name);
     return *this;
   }
   template <typename U>
@@ -168,7 +168,8 @@ class SourceImpl {
   }
 
  private:
-  SourceBase& base_;
+  // Never null.
+  SourceBase* base_;
 };
 
 template <bool IsSide, typename T>

mediapipe/framework/api2/builder_test.cc

@@ -1,5 +1,7 @@
 #include "mediapipe/framework/api2/builder.h"
 
+#include <functional>
+
 #include "absl/strings/substitute.h"
 #include "mediapipe/framework/api2/node.h"
 #include "mediapipe/framework/api2/packet.h"
@@ -46,6 +48,88 @@ TEST(BuilderTest, BuildGraph) {
   EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
 }
 
+TEST(BuilderTest, CopyableSource) {
+  builder::Graph graph;
+  builder::Source<false, int> a = graph[Input<int>("A")];
+  a.SetName("a");
+  builder::Source<false, int> b = graph[Input<int>("B")];
+  b.SetName("b");
+  builder::SideSource<false, float> side_a = graph[SideInput<float>("SIDE_A")];
+  side_a.SetName("side_a");
+  builder::SideSource<false, float> side_b = graph[SideInput<float>("SIDE_B")];
+  side_b.SetName("side_b");
+  builder::Destination<false, int> out = graph[Output<int>("OUT")];
+  builder::SideDestination<false, float> side_out =
+      graph[SideOutput<float>("SIDE_OUT")];
+
+  builder::Source<false, int> input = a;
+  input = b;
+  builder::SideSource<false, float> side_input = side_b;
+  side_input = side_a;
+
+  input >> out;
+  side_input >> side_out;
+
+  CalculatorGraphConfig expected =
+      mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        input_stream: "A:a"
+        input_stream: "B:b"
+        output_stream: "OUT:b"
+        input_side_packet: "SIDE_A:side_a"
+        input_side_packet: "SIDE_B:side_b"
+        output_side_packet: "SIDE_OUT:side_a"
+      )pb");
+  EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
+}
+
+TEST(BuilderTest, BuildGraphWithFunctions) {
+  builder::Graph graph;
+
+  builder::Source<false, int> base = graph[Input<int>("IN")];
+  base.SetName("base");
+  builder::SideSource<false, float> side = graph[SideInput<float>("SIDE")];
+  side.SetName("side");
+
+  auto foo_fn = [](builder::Source<false, int> base,
+                   builder::SideSource<false, float> side,
+                   builder::Graph& graph) {
+    auto& foo = graph.AddNode("Foo");
+    base >> foo[Input<int>("BASE")];
+    side >> foo[SideInput<float>("SIDE")];
+    return foo[Output<double>("OUT")];
+  };
+  builder::Source<false, double> foo_out = foo_fn(base, side, graph);
+
+  auto bar_fn = [](builder::Source<false, double> in, builder::Graph& graph) {
+    auto& bar = graph.AddNode("Bar");
+    in >> bar[Input<double>("IN")];
+    return bar[Output<double>("OUT")];
+  };
+  builder::Source<false, double> bar_out = bar_fn(foo_out, graph);
+  bar_out.SetName("out");
+
+  bar_out >> graph[Output<double>("OUT")];
+
+  CalculatorGraphConfig expected =
+      mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        input_stream: "IN:base"
+        input_side_packet: "SIDE:side"
+        output_stream: "OUT:out"
+        node {
+          calculator: "Foo"
+          input_stream: "BASE:base"
+          input_side_packet: "SIDE:side"
+          output_stream: "OUT:__stream_0"
+        }
+        node {
+          calculator: "Bar"
+          input_stream: "IN:__stream_0"
+          output_stream: "OUT:out"
+        }
+      )pb");
+  EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
+}
+
 template <class FooT>
 void BuildGraphTypedTest() {
   builder::Graph graph;

mediapipe/framework/tool/template_parser.cc

@@ -1666,6 +1666,7 @@ TemplateParser::Parser::Parser()
       allow_partial_(false),
       allow_case_insensitive_field_(false),
       allow_unknown_field_(false),
+      allow_unknown_extension_(true),
       allow_unknown_enum_(false),
       allow_field_number_(false),
       allow_relaxed_whitespace_(false),
@@ -1683,12 +1684,11 @@ bool TemplateParser::Parser::Parse(io::ZeroCopyInputStream* input,
       allow_singular_overwrites_ ? ParserImpl::ALLOW_SINGULAR_OVERWRITES
                                  : ParserImpl::FORBID_SINGULAR_OVERWRITES;
 
-  bool allow_unknown_extension = true;
   int recursion_limit = std::numeric_limits<int>::max();
   MediaPipeParserImpl parser(
       output->GetDescriptor(), input, error_collector_, finder_,
       parse_info_tree_, overwrites_policy, allow_case_insensitive_field_,
-      allow_unknown_field_, allow_unknown_extension, allow_unknown_enum_,
+      allow_unknown_field_, allow_unknown_extension_, allow_unknown_enum_,
       allow_field_number_, allow_relaxed_whitespace_, allow_partial_,
       recursion_limit);
   return MergeUsingImpl(input, output, &parser);
@@ -1702,13 +1702,12 @@ bool TemplateParser::Parser::ParseFromString(const std::string& input,
 
 bool TemplateParser::Parser::Merge(io::ZeroCopyInputStream* input,
                                    Message* output) {
-  bool allow_unknown_extension = true;
   int recursion_limit = std::numeric_limits<int>::max();
   MediaPipeParserImpl parser(
       output->GetDescriptor(), input, error_collector_, finder_,
       parse_info_tree_, ParserImpl::ALLOW_SINGULAR_OVERWRITES,
       allow_case_insensitive_field_, allow_unknown_field_,
-      allow_unknown_extension, allow_unknown_enum_, allow_field_number_,
+      allow_unknown_extension_, allow_unknown_enum_, allow_field_number_,
       allow_relaxed_whitespace_, allow_partial_, recursion_limit);
   return MergeUsingImpl(input, output, &parser);
 }
@@ -1737,13 +1736,12 @@ bool TemplateParser::Parser::MergeUsingImpl(
 bool TemplateParser::Parser::ParseFieldValueFromString(
     const std::string& input, const FieldDescriptor* field, Message* output) {
   io::ArrayInputStream input_stream(input.data(), input.size());
-  bool allow_unknown_extension = true;
   int recursion_limit = std::numeric_limits<int>::max();
   ParserImpl parser(
       output->GetDescriptor(), &input_stream, error_collector_, finder_,
       parse_info_tree_, ParserImpl::ALLOW_SINGULAR_OVERWRITES,
       allow_case_insensitive_field_, allow_unknown_field_,
-      allow_unknown_extension, allow_unknown_enum_, allow_field_number_,
+      allow_unknown_extension_, allow_unknown_enum_, allow_field_number_,
       allow_relaxed_whitespace_, allow_partial_, recursion_limit);
   return parser.ParseField(field, output);
 }

mediapipe/framework/tool/template_parser.h

@@ -37,6 +37,10 @@ class TemplateParser {
     Parser();
     ~Parser();
 
+    void set_allow_unknown_extension(bool allow_unknown_extension) {
+      allow_unknown_extension_ = allow_unknown_extension;
+    }
+
     // Like TextFormat::Parse().
     bool Parse(proto_ns::io::ZeroCopyInputStream* input,
                proto_ns::Message* output);
@@ -99,6 +103,7 @@ class TemplateParser {
     bool allow_partial_;
     bool allow_case_insensitive_field_;
     bool allow_unknown_field_;
+    bool allow_unknown_extension_;
     bool allow_unknown_enum_;
     bool allow_field_number_;
     bool allow_relaxed_whitespace_;

mediapipe/gpu/gl_scaler_calculator.cc

@@ -34,6 +34,13 @@ typedef int DimensionsPacketType[2];
 
 namespace mediapipe {
 
+constexpr char kLeftRightPaddingTag[] = "LEFT_RIGHT_PADDING";
+constexpr char kTopBottomPaddingTag[] = "TOP_BOTTOM_PADDING";
+constexpr char kOptionsTag[] = "OPTIONS";
+constexpr char kOutputDimensionsTag[] = "OUTPUT_DIMENSIONS";
+constexpr char kRotationTag[] = "ROTATION";
+constexpr char kImageTag[] = "IMAGE";
+
 using Image = mediapipe::Image;
 
 // Scales, rotates, horizontal or vertical flips the image.
@@ -102,41 +109,41 @@ REGISTER_CALCULATOR(GlScalerCalculator);
 
 // static
 absl::Status GlScalerCalculator::GetContract(CalculatorContract* cc) {
-  if (cc->Inputs().HasTag("IMAGE")) {
+  if (cc->Inputs().HasTag(kImageTag)) {
-    cc->Inputs().Tag("IMAGE").Set<Image>();
+    cc->Inputs().Tag(kImageTag).Set<Image>();
   } else {
     TagOrIndex(&cc->Inputs(), "VIDEO", 0).Set<GpuBuffer>();
   }
-  if (cc->Outputs().HasTag("IMAGE")) {
+  if (cc->Outputs().HasTag(kImageTag)) {
-    cc->Outputs().Tag("IMAGE").Set<Image>();
+    cc->Outputs().Tag(kImageTag).Set<Image>();
   } else {
     TagOrIndex(&cc->Outputs(), "VIDEO", 0).Set<GpuBuffer>();
   }
 
-  if (cc->Inputs().HasTag("ROTATION")) {
+  if (cc->Inputs().HasTag(kRotationTag)) {
-    cc->Inputs().Tag("ROTATION").Set<int>();
+    cc->Inputs().Tag(kRotationTag).Set<int>();
   }
-  if (cc->Inputs().HasTag("OUTPUT_DIMENSIONS")) {
+  if (cc->Inputs().HasTag(kOutputDimensionsTag)) {
-    cc->Inputs().Tag("OUTPUT_DIMENSIONS").Set<DimensionsPacketType>();
+    cc->Inputs().Tag(kOutputDimensionsTag).Set<DimensionsPacketType>();
   }
   MP_RETURN_IF_ERROR(GlCalculatorHelper::UpdateContract(cc));
 
-  if (cc->InputSidePackets().HasTag("OPTIONS")) {
+  if (cc->InputSidePackets().HasTag(kOptionsTag)) {
-    cc->InputSidePackets().Tag("OPTIONS").Set<GlScalerCalculatorOptions>();
+    cc->InputSidePackets().Tag(kOptionsTag).Set<GlScalerCalculatorOptions>();
   }
   if (HasTagOrIndex(&cc->InputSidePackets(), "OUTPUT_DIMENSIONS", 1)) {
     TagOrIndex(&cc->InputSidePackets(), "OUTPUT_DIMENSIONS", 1)
         .Set<DimensionsPacketType>();
   }
-  if (cc->InputSidePackets().HasTag("ROTATION")) {
+  if (cc->InputSidePackets().HasTag(kRotationTag)) {
     // Counterclockwise rotation.
-    cc->InputSidePackets().Tag("ROTATION").Set<int>();
+    cc->InputSidePackets().Tag(kRotationTag).Set<int>();
   }
 
-  if (cc->Outputs().HasTag("TOP_BOTTOM_PADDING") &&
+  if (cc->Outputs().HasTag(kTopBottomPaddingTag) &&
-      cc->Outputs().HasTag("LEFT_RIGHT_PADDING")) {
+      cc->Outputs().HasTag(kLeftRightPaddingTag)) {
-    cc->Outputs().Tag("TOP_BOTTOM_PADDING").Set<float>();
+    cc->Outputs().Tag(kTopBottomPaddingTag).Set<float>();
-    cc->Outputs().Tag("LEFT_RIGHT_PADDING").Set<float>();
+    cc->Outputs().Tag(kLeftRightPaddingTag).Set<float>();
   }
   return absl::OkStatus();
 }
@@ -187,8 +194,8 @@ absl::Status GlScalerCalculator::Open(CalculatorContext* cc) {
     dst_width_ = dimensions[0];
     dst_height_ = dimensions[1];
   }
-  if (cc->InputSidePackets().HasTag("ROTATION")) {
+  if (cc->InputSidePackets().HasTag(kRotationTag)) {
-    rotation_ccw = cc->InputSidePackets().Tag("ROTATION").Get<int>();
+    rotation_ccw = cc->InputSidePackets().Tag(kRotationTag).Get<int>();
   }
 
   MP_RETURN_IF_ERROR(FrameRotationFromInt(&rotation_, rotation_ccw));
@@ -197,22 +204,22 @@ absl::Status GlScalerCalculator::Open(CalculatorContext* cc) {
 }
 
 absl::Status GlScalerCalculator::Process(CalculatorContext* cc) {
-  if (cc->Inputs().HasTag("OUTPUT_DIMENSIONS")) {
+  if (cc->Inputs().HasTag(kOutputDimensionsTag)) {
-    if (cc->Inputs().Tag("OUTPUT_DIMENSIONS").IsEmpty()) {
+    if (cc->Inputs().Tag(kOutputDimensionsTag).IsEmpty()) {
       // OUTPUT_DIMENSIONS input stream is specified, but value is missing.
       return absl::OkStatus();
     }
 
     const auto& dimensions =
-        cc->Inputs().Tag("OUTPUT_DIMENSIONS").Get<DimensionsPacketType>();
+        cc->Inputs().Tag(kOutputDimensionsTag).Get<DimensionsPacketType>();
     dst_width_ = dimensions[0];
     dst_height_ = dimensions[1];
   }
 
   return helper_.RunInGlContext([this, cc]() -> absl::Status {
     const auto& input =
-        cc->Inputs().HasTag("IMAGE")
+        cc->Inputs().HasTag(kImageTag)
-            ? cc->Inputs().Tag("IMAGE").Get<Image>().GetGpuBuffer()
+            ? cc->Inputs().Tag(kImageTag).Get<Image>().GetGpuBuffer()
             : TagOrIndex(cc->Inputs(), "VIDEO", 0).Get<GpuBuffer>();
     QuadRenderer* renderer = nullptr;
     GlTexture src1;
@@ -254,8 +261,8 @@ absl::Status GlScalerCalculator::Process(CalculatorContext* cc) {
     RET_CHECK(renderer) << "Unsupported input texture type";
 
     // Override input side packet if ROTATION input packet is provided.
-    if (cc->Inputs().HasTag("ROTATION")) {
+    if (cc->Inputs().HasTag(kRotationTag)) {
-      int rotation_ccw = cc->Inputs().Tag("ROTATION").Get<int>();
+      int rotation_ccw = cc->Inputs().Tag(kRotationTag).Get<int>();
       MP_RETURN_IF_ERROR(FrameRotationFromInt(&rotation_, rotation_ccw));
     }
 
@@ -263,18 +270,18 @@ absl::Status GlScalerCalculator::Process(CalculatorContext* cc) {
     int dst_height;
     GetOutputDimensions(src1.width(), src1.height(), &dst_width, &dst_height);
 
-    if (cc->Outputs().HasTag("TOP_BOTTOM_PADDING") &&
+    if (cc->Outputs().HasTag(kTopBottomPaddingTag) &&
-        cc->Outputs().HasTag("LEFT_RIGHT_PADDING")) {
+        cc->Outputs().HasTag(kLeftRightPaddingTag)) {
       float top_bottom_padding;
       float left_right_padding;
       GetOutputPadding(src1.width(), src1.height(), dst_width, dst_height,
                        &top_bottom_padding, &left_right_padding);
       cc->Outputs()
-          .Tag("TOP_BOTTOM_PADDING")
+          .Tag(kTopBottomPaddingTag)
           .AddPacket(
               MakePacket<float>(top_bottom_padding).At(cc->InputTimestamp()));
       cc->Outputs()
-          .Tag("LEFT_RIGHT_PADDING")
+          .Tag(kLeftRightPaddingTag)
           .AddPacket(
               MakePacket<float>(left_right_padding).At(cc->InputTimestamp()));
     }
@@ -304,9 +311,9 @@ absl::Status GlScalerCalculator::Process(CalculatorContext* cc) {
 
     glFlush();
 
-    if (cc->Outputs().HasTag("IMAGE")) {
+    if (cc->Outputs().HasTag(kImageTag)) {
       auto output = dst.GetFrame<Image>();
-      cc->Outputs().Tag("IMAGE").Add(output.release(), cc->InputTimestamp());
+      cc->Outputs().Tag(kImageTag).Add(output.release(), cc->InputTimestamp());
     } else {
       auto output = dst.GetFrame<GpuBuffer>();
       TagOrIndex(&cc->Outputs(), "VIDEO", 0)

mediapipe/graphs/pose_tracking/BUILD

@@ -24,6 +24,7 @@ package(default_visibility = ["//visibility:public"])
 cc_library(
     name = "pose_tracking_gpu_deps",
     deps = [
+        "//mediapipe/calculators/core:constant_side_packet_calculator",
         "//mediapipe/calculators/core:flow_limiter_calculator",
         "//mediapipe/graphs/pose_tracking/subgraphs:pose_renderer_gpu",
         "//mediapipe/modules/pose_landmark:pose_landmark_gpu",
@@ -40,6 +41,7 @@ mediapipe_binary_graph(
 cc_library(
     name = "pose_tracking_cpu_deps",
     deps = [
+        "//mediapipe/calculators/core:constant_side_packet_calculator",
         "//mediapipe/calculators/core:flow_limiter_calculator",
         "//mediapipe/graphs/pose_tracking/subgraphs:pose_renderer_cpu",
         "//mediapipe/modules/pose_landmark:pose_landmark_cpu",

mediapipe/graphs/pose_tracking/pose_tracking_cpu.pbtxt

@@ -8,6 +8,17 @@ output_stream: "output_video"
 # Pose landmarks. (NormalizedLandmarkList)
 output_stream: "pose_landmarks"
 
+# Generates side packet to enable segmentation.
+node {
+  calculator: "ConstantSidePacketCalculator"
+  output_side_packet: "PACKET:enable_segmentation"
+  node_options: {
+    [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
+      packet { bool_value: true }
+    }
+  }
+}
+
 # Throttles the images flowing downstream for flow control. It passes through
 # the very first incoming image unaltered, and waits for downstream nodes
 # (calculators and subgraphs) in the graph to finish their tasks before it
@@ -32,8 +43,10 @@ node {
 # Subgraph that detects poses and corresponding landmarks.
 node {
   calculator: "PoseLandmarkCpu"
+  input_side_packet: "ENABLE_SEGMENTATION:enable_segmentation"
   input_stream: "IMAGE:throttled_input_video"
   output_stream: "LANDMARKS:pose_landmarks"
+  output_stream: "SEGMENTATION_MASK:segmentation_mask"
   output_stream: "DETECTION:pose_detection"
   output_stream: "ROI_FROM_LANDMARKS:roi_from_landmarks"
 }
@@ -43,7 +56,8 @@ node {
   calculator: "PoseRendererCpu"
   input_stream: "IMAGE:throttled_input_video"
   input_stream: "LANDMARKS:pose_landmarks"
-  input_stream: "ROI:roi_from_landmarks"
+  input_stream: "SEGMENTATION_MASK:segmentation_mask"
   input_stream: "DETECTION:pose_detection"
+  input_stream: "ROI:roi_from_landmarks"
   output_stream: "IMAGE:output_video"
 }

mediapipe/graphs/pose_tracking/pose_tracking_gpu.pbtxt

@@ -8,6 +8,17 @@ output_stream: "output_video"
 # Pose landmarks. (NormalizedLandmarkList)
 output_stream: "pose_landmarks"
 
+# Generates side packet to enable segmentation.
+node {
+  calculator: "ConstantSidePacketCalculator"
+  output_side_packet: "PACKET:enable_segmentation"
+  node_options: {
+    [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
+      packet { bool_value: true }
+    }
+  }
+}
+
 # Throttles the images flowing downstream for flow control. It passes through
 # the very first incoming image unaltered, and waits for downstream nodes
 # (calculators and subgraphs) in the graph to finish their tasks before it
@@ -32,8 +43,10 @@ node {
 # Subgraph that detects poses and corresponding landmarks.
 node {
   calculator: "PoseLandmarkGpu"
+  input_side_packet: "ENABLE_SEGMENTATION:enable_segmentation"
   input_stream: "IMAGE:throttled_input_video"
   output_stream: "LANDMARKS:pose_landmarks"
+  output_stream: "SEGMENTATION_MASK:segmentation_mask"
   output_stream: "DETECTION:pose_detection"
   output_stream: "ROI_FROM_LANDMARKS:roi_from_landmarks"
 }
@@ -43,7 +56,8 @@ node {
   calculator: "PoseRendererGpu"
   input_stream: "IMAGE:throttled_input_video"
   input_stream: "LANDMARKS:pose_landmarks"
-  input_stream: "ROI:roi_from_landmarks"
+  input_stream: "SEGMENTATION_MASK:segmentation_mask"
   input_stream: "DETECTION:pose_detection"
+  input_stream: "ROI:roi_from_landmarks"
   output_stream: "IMAGE:output_video"
 }

mediapipe/graphs/pose_tracking/subgraphs/BUILD

@@ -27,6 +27,7 @@ mediapipe_simple_subgraph(
     register_as = "PoseRendererGpu",
     deps = [
         "//mediapipe/calculators/core:split_landmarks_calculator",
+        "//mediapipe/calculators/image:recolor_calculator",
         "//mediapipe/calculators/util:annotation_overlay_calculator",
         "//mediapipe/calculators/util:detections_to_render_data_calculator",
         "//mediapipe/calculators/util:landmarks_to_render_data_calculator",
@@ -41,6 +42,7 @@ mediapipe_simple_subgraph(
     register_as = "PoseRendererCpu",
     deps = [
         "//mediapipe/calculators/core:split_landmarks_calculator",
+        "//mediapipe/calculators/image:recolor_calculator",
         "//mediapipe/calculators/util:annotation_overlay_calculator",
         "//mediapipe/calculators/util:detections_to_render_data_calculator",
         "//mediapipe/calculators/util:landmarks_to_render_data_calculator",