Open source MediaPipe object detector task reference app prototype.

PiperOrigin-RevId: 478811683
This commit is contained in:
Sebastian Schmidt 2022-10-04 09:40:03 -07:00 committed by Copybara-Service
parent 05209a4392
commit 8d5cf9bbed
29 changed files with 601 additions and 1 deletions

View File

@ -18,7 +18,7 @@ import android.content.ClipDescription;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import androidx.appcompat.widget.AppCompatEditText;
import android.support.v7.widget.AppCompatEditText;
import android.util.AttributeSet;
import android.util.Log;
import android.view.inputmethod.EditorInfo;

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@ -0,0 +1,21 @@
# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
#
# 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"])
filegroup(
name = "resource_files",
srcs = glob(["res/**"]),
visibility = ["//mediapipe/tasks/examples/android:__subpackages__"],
)

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@ -0,0 +1,37 @@
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.google.mediapipe.tasks.examples.objectdetector">
<uses-sdk
android:minSdkVersion="28"
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" />
<!-- For logging solution events -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="MediaPipe Tasks Object Detector"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:exported="false">
<activity android:name=".MainActivity"
android:screenOrientation="portrait"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

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@ -0,0 +1,48 @@
# Copyright 2022 The MediaPipe Authors. All Rights Reserved.
#
# 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 = "objectdetector",
srcs = glob(["**/*.java"]),
assets = [
"//mediapipe/tasks/testdata/vision:test_models",
],
assets_dir = "",
custom_package = "com.google.mediapipe.tasks.examples.objectdetector",
manifest = "AndroidManifest.xml",
manifest_values = {
"applicationId": "com.google.mediapipe.tasks.examples.objectdetector",
},
multidex = "native",
resource_files = ["//mediapipe/tasks/examples/android:resource_files"],
deps = [
"//mediapipe/java/com/google/mediapipe/framework/image",
"//mediapipe/tasks/java/com/google/mediapipe/tasks/components/containers:detection",
"//mediapipe/tasks/java/com/google/mediapipe/tasks/core",
"//mediapipe/tasks/java/com/google/mediapipe/tasks/vision/core",
"//mediapipe/tasks/java/com/google/mediapipe/tasks/vision/objectdetector",
"//third_party:androidx_appcompat",
"//third_party:androidx_constraint_layout",
"//third_party:opencv",
"@maven//:androidx_activity_activity",
"@maven//:androidx_concurrent_concurrent_futures",
"@maven//:androidx_exifinterface_exifinterface",
"@maven//:androidx_fragment_fragment",
"@maven//:com_google_guava_guava",
],
)

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@ -0,0 +1,236 @@
// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
//
// 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.tasks.examples.objectdetector;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.media.MediaMetadataRetriever;
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 androidx.exifinterface.media.ExifInterface;
// ContentResolver dependency
import com.google.mediapipe.framework.image.BitmapImageBuilder;
import com.google.mediapipe.framework.image.Image;
import com.google.mediapipe.tasks.core.BaseOptions;
import com.google.mediapipe.tasks.vision.core.RunningMode;
import com.google.mediapipe.tasks.vision.objectdetector.ObjectDetectionResult;
import com.google.mediapipe.tasks.vision.objectdetector.ObjectDetector;
import com.google.mediapipe.tasks.vision.objectdetector.ObjectDetector.ObjectDetectorOptions;
import java.io.IOException;
import java.io.InputStream;
/** Main activity of MediaPipe Task Object Detector reference app. */
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final String MODEL_FILE = "coco_ssd_mobilenet_v1_1.0_quant_2018_06_29.tflite";
private ObjectDetector objectDetector;
private enum InputSource {
UNKNOWN,
IMAGE,
VIDEO,
CAMERA,
}
private InputSource inputSource = InputSource.UNKNOWN;
// Image mode demo component.
private ActivityResultLauncher<Intent> imageGetter;
// Video mode demo component.
private ActivityResultLauncher<Intent> videoGetter;
private ObjectDetectionResultImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupImageModeDemo();
setupVideoModeDemo();
// TODO: Adds live camera demo.
}
/** Sets up the image mode demo. */
private void setupImageModeDemo() {
imageView = new ObjectDetectionResultImageView(this);
// 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 =
downscaleBitmap(
MediaStore.Images.Media.getBitmap(
this.getContentResolver(), resultIntent.getData()));
} catch (IOException e) {
Log.e(TAG, "Bitmap reading error:" + e);
}
try {
InputStream imageData =
this.getContentResolver().openInputStream(resultIntent.getData());
bitmap = rotateBitmap(bitmap, imageData);
} catch (IOException e) {
Log.e(TAG, "Bitmap rotation error:" + e);
}
if (bitmap != null) {
Image image = new BitmapImageBuilder(bitmap).build();
ObjectDetectionResult detectionResult = objectDetector.detect(image);
imageView.setData(image, detectionResult);
runOnUiThread(() -> imageView.update());
}
}
}
});
Button loadImageButton = findViewById(R.id.button_load_picture);
loadImageButton.setOnClickListener(
v -> {
if (inputSource != InputSource.IMAGE) {
createObjectDetector(RunningMode.IMAGE);
this.inputSource = InputSource.IMAGE;
updateLayout();
}
// Reads images from gallery.
Intent pickImageIntent = new Intent(Intent.ACTION_PICK);
pickImageIntent.setDataAndType(MediaStore.Images.Media.INTERNAL_CONTENT_URI, "image/*");
imageGetter.launch(pickImageIntent);
});
}
/** Sets up the video mode demo. */
private void setupVideoModeDemo() {
imageView = new ObjectDetectionResultImageView(this);
// 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) {
MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever();
metaRetriever.setDataSource(this, resultIntent.getData());
long duration =
Long.parseLong(
metaRetriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_DURATION));
int numFrames =
Integer.parseInt(
metaRetriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_VIDEO_FRAME_COUNT));
long frameIntervalMs = duration / numFrames;
for (int i = 0; i < numFrames; ++i) {
Image image = new BitmapImageBuilder(metaRetriever.getFrameAtIndex(i)).build();
ObjectDetectionResult detectionResult =
objectDetector.detectForVideo(image, frameIntervalMs * i);
// Currently only annotates the detection result on the first video frame and
// display it to verify the correctness.
// TODO: Annotates the detection result on every frame, save the
// annotated frames as a video file, and play back the video afterwards.
if (i == 0) {
imageView.setData(image, detectionResult);
runOnUiThread(() -> imageView.update());
}
}
}
}
});
Button loadVideoButton = findViewById(R.id.button_load_video);
loadVideoButton.setOnClickListener(
v -> {
createObjectDetector(RunningMode.VIDEO);
updateLayout();
this.inputSource = InputSource.VIDEO;
// Reads a video from gallery.
Intent pickVideoIntent = new Intent(Intent.ACTION_PICK);
pickVideoIntent.setDataAndType(MediaStore.Video.Media.INTERNAL_CONTENT_URI, "video/*");
videoGetter.launch(pickVideoIntent);
});
}
private void createObjectDetector(RunningMode mode) {
if (objectDetector != null) {
objectDetector.close();
}
// Initializes a new MediaPipe ObjectDetector instance
ObjectDetectorOptions options =
ObjectDetectorOptions.builder()
.setBaseOptions(BaseOptions.builder().setModelAssetPath(MODEL_FILE).build())
.setScoreThreshold(0.5f)
.setMaxResults(5)
.setRunningMode(mode)
.build();
objectDetector = ObjectDetector.createFromOptions(this, options);
}
private void updateLayout() {
// Updates the preview layout.
FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
frameLayout.removeAllViewsInLayout();
imageView.setImageDrawable(null);
frameLayout.addView(imageView);
imageView.setVisibility(View.VISIBLE);
}
private Bitmap downscaleBitmap(Bitmap originalBitmap) {
double aspectRatio = (double) originalBitmap.getWidth() / originalBitmap.getHeight();
int width = imageView.getWidth();
int height = imageView.getHeight();
if (((double) imageView.getWidth() / imageView.getHeight()) > aspectRatio) {
width = (int) (height * aspectRatio);
} else {
height = (int) (width / aspectRatio);
}
return Bitmap.createScaledBitmap(originalBitmap, width, height, false);
}
private Bitmap rotateBitmap(Bitmap inputBitmap, InputStream imageData) throws IOException {
int orientation =
new ExifInterface(imageData)
.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
if (orientation == ExifInterface.ORIENTATION_NORMAL) {
return inputBitmap;
}
Matrix matrix = new Matrix();
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
matrix.postRotate(90);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
matrix.postRotate(180);
break;
case ExifInterface.ORIENTATION_ROTATE_270:
matrix.postRotate(270);
break;
default:
matrix.postRotate(0);
}
return Bitmap.createBitmap(
inputBitmap, 0, 0, inputBitmap.getWidth(), inputBitmap.getHeight(), matrix, true);
}
}

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@ -0,0 +1,77 @@
// Copyright 2022 The MediaPipe Authors. All Rights Reserved.
//
// 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.tasks.examples.objectdetector;
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 com.google.mediapipe.framework.image.BitmapExtractor;
import com.google.mediapipe.framework.image.Image;
import com.google.mediapipe.tasks.components.containers.Detection;
import com.google.mediapipe.tasks.vision.objectdetector.ObjectDetectionResult;
/** An ImageView implementation for displaying {@link ObjectDetectionResult}. */
public class ObjectDetectionResultImageView extends AppCompatImageView {
private static final String TAG = "ObjectDetectionResultImageView";
private static final int BBOX_COLOR = Color.GREEN;
private static final int BBOX_THICKNESS = 5; // Pixels
private Bitmap latest;
public ObjectDetectionResultImageView(Context context) {
super(context);
setScaleType(AppCompatImageView.ScaleType.FIT_CENTER);
}
/**
* Sets an {@link Image} and an {@link ObjectDetectionResult} to render.
*
* @param image an {@link Image} object for annotation.
* @param result an {@link ObjectDetectionResult} object that contains the detection result.
*/
public void setData(Image image, ObjectDetectionResult result) {
if (image == null || result == null) {
return;
}
latest = BitmapExtractor.extract(image);
Canvas canvas = new Canvas(latest);
canvas.drawBitmap(latest, new Matrix(), null);
for (int i = 0; i < result.detections().size(); ++i) {
drawDetectionOnCanvas(result.detections().get(i), canvas);
}
}
/** Updates the image view with the latest {@link ObjectDetectionResult}. */
public void update() {
postInvalidate();
if (latest != null) {
setImageBitmap(latest);
}
}
private void drawDetectionOnCanvas(Detection detection, Canvas canvas) {
// TODO: Draws the category and the score per bounding box.
// Draws bounding box.
Paint bboxPaint = new Paint();
bboxPaint.setColor(BBOX_COLOR);
bboxPaint.setStyle(Paint.Style.STROKE);
bboxPaint.setStrokeWidth(BBOX_THICKNESS);
canvas.drawRect(detection.boundingBox(), bboxPaint);
}
}

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="@+id/buttons"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="?android:attr/buttonBarStyle" android:gravity="center"
android:orientation="horizontal">
<Button
android:id="@+id/button_load_picture"
android:layout_width="wrap_content"
style="?android:attr/buttonBarButtonStyle" android:layout_height="wrap_content"
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"
style="?android:attr/buttonBarButtonStyle" android:layout_height="wrap_content"
android:text="@string/start_camera" />
</LinearLayout>
<FrameLayout
android:id="@+id/preview_display_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/no_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/instruction" />
</FrameLayout>
</LinearLayout>

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</adaptive-icon>

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<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
<background android:drawable="@drawable/ic_launcher_background"/>
<foreground android:drawable="@mipmap/ic_launcher_foreground"/>
</adaptive-icon>

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<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#008577</color>
<color name="colorPrimaryDark">#00574B</color>
<color name="colorAccent">#D81B60</color>
</resources>

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<resources>
<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>

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<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
</resources>