mediapipe/docs/solutions/holistic.md

---
layout: default
title: Holistic
parent: Solutions
nav_order: 6
---

# MediaPipe Holistic
{: .no_toc }

<details close markdown="block">
  <summary>
    Table of contents
  </summary>
  {: .text-delta }
1. TOC
{:toc}
</details>
---

## Overview

Live perception of simultaneous [human pose](./pose.md),
[face landmarks](./face_mesh.md), and [hand tracking](./hands.md) in real-time
on mobile devices can enable various modern life applications: fitness and sport
analysis, gesture control and sign language recognition, augmented reality
try-on and effects. MediaPipe already offers fast and accurate, yet separate,
solutions for these tasks. Combining them all in real-time into a semantically
consistent end-to-end solution is a uniquely difficult problem requiring
simultaneous inference of multiple, dependent neural networks.

![holistic_sports_and_gestures_example.gif](../images/mobile/holistic_sports_and_gestures_example.gif) |
:----------------------------------------------------------------------------------------------------: |
*Fig 1. Example of MediaPipe Holistic.*                                                                |

## ML Pipeline

The MediaPipe Holistic pipeline integrates separate models for
[pose](./pose.md), [face](./face_mesh.md) and [hand](./hands.md) components,
each of which are optimized for their particular domain. However, because of
their different specializations, the input to one component is not well-suited
for the others. The pose estimation model, for example, takes a lower, fixed
resolution video frame (256x256) as input. But if one were to crop the hand and
face regions from that image to pass to their respective models, the image
resolution would be too low for accurate articulation. Therefore, we designed
MediaPipe Holistic as a multi-stage pipeline, which treats the different regions
using a region appropriate image resolution.

First, we estimate the human pose (top of Fig 2) with [BlazePose](./pose.md)’s
pose detector and subsequent landmark model. Then, using the inferred pose
landmarks we derive three regions of interest (ROI) crops for each hand (2x) and
the face, and employ a re-crop model to improve the ROI. We then crop the
full-resolution input frame to these ROIs and apply task-specific face and hand
models to estimate their corresponding landmarks. Finally, we merge all
landmarks with those of the pose model to yield the full 540+ landmarks.

![holistic_pipeline_example.jpg](../images/mobile/holistic_pipeline_example.jpg) |
:------------------------------------------------------------------------------: |
*Fig 2. MediaPipe Holistic Pipeline Overview.*                                   |

To streamline the identification of ROIs for face and hands, we utilize a
tracking approach similar to the one we use for standalone
[face](./face_mesh.md) and [hand](./hands.md) pipelines. It assumes that the
object doesn't move significantly between frames and uses estimation from the
previous frame as a guide to the object region on the current one. However,
during fast movements, the tracker can lose the target, which requires the
detector to re-localize it in the image. MediaPipe Holistic uses
[pose](./pose.md) prediction (on every frame) as an additional ROI prior to
reduce the response time of the pipeline when reacting to fast movements. This
also enables the model to retain semantic consistency across the body and its
parts by preventing a mixup between left and right hands or body parts of one
person in the frame with another.

In addition, the resolution of the input frame to the pose model is low enough
that the resulting ROIs for face and hands are still too inaccurate to guide the
re-cropping of those regions, which require a precise input crop to remain
lightweight. To close this accuracy gap we use lightweight face and hand re-crop
models that play the role of
[spatial transformers](https://arxiv.org/abs/1506.02025) and cost only ~10% of
corresponding model's inference time.

The pipeline is implemented as a MediaPipe
[graph](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/holistic_tracking/holistic_tracking_gpu.pbtxt)
that uses a
[holistic landmark subgraph](https://github.com/google/mediapipe/tree/master/mediapipe/modules/holistic_landmark/holistic_landmark_gpu.pbtxt)
from the
[holistic landmark module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/holistic_landmark)
and renders using a dedicated
[holistic renderer subgraph](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/holistic_tracking/holistic_tracking_to_render_data.pbtxt).
The
[holistic landmark subgraph](https://github.com/google/mediapipe/tree/master/mediapipe/modules/holistic_landmark/holistic_landmark_gpu.pbtxt)
internally uses a
[pose landmark module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/pose_landmark)
,
[hand landmark module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/hand_landmark)
and
[face landmark module](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_landmark/).
Please check them for implementation details.

Note: To visualize a graph, copy the graph and paste it into
[MediaPipe Visualizer](https://viz.mediapipe.dev/). For more information on how
to visualize its associated subgraphs, please see
[visualizer documentation](../tools/visualizer.md).

## Models

### Landmark Models

MediaPipe Holistic utilizes the pose, face and hand landmark models in
[MediaPipe Pose](./pose.md), [MediaPipe Face Mesh](./face_mesh.md) and
[MediaPipe Hands](./hands.md) respectively to generate a total of 543 landmarks
(33 pose landmarks, 468 face landmarks, and 21 hand landmarks per hand).

### Hand Recrop Model

For cases when the accuracy of the pose model is low enough that the resulting
ROIs for hands are still too inaccurate we run the additional lightweight hand
re-crop model that play the role of
[spatial transformer](https://arxiv.org/abs/1506.02025) and cost only ~10% of
hand model inference time.

## Solution APIs

### Cross-platform Configuration Options

Naming style and availability may differ slightly across platforms/languages.

#### static_image_mode

If set to `false`, the solution treats the input images as a video stream. It
will try to detect the most prominent person in the very first images, and upon
a successful detection further localizes the pose and other landmarks. In
subsequent images, it then simply tracks those landmarks without invoking
another detection until it loses track, on reducing computation and latency. If
set to `true`, person detection runs every input image, ideal for processing a
batch of static, possibly unrelated, images. Default to `false`.

#### upper_body_only

If set to `true`, the solution outputs only the 25 upper-body pose landmarks
(535 in total) instead of the full set of 33 pose landmarks (543 in total). Note
that upper-body-only prediction may be more accurate for use cases where the
lower-body parts are mostly out of view. Default to `false`.

#### smooth_landmarks

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`.

#### min_detection_confidence

Minimum confidence value (`[0.0, 1.0]`) from the person-detection model for the
detection to be considered successful. Default to `0.5`.

#### min_tracking_confidence

Minimum confidence value (`[0.0, 1.0]`) from the landmark-tracking model for the
pose landmarks to be considered tracked successfully, or otherwise person
detection will be invoked automatically on the next input image. Setting it to a
higher value can increase robustness of the solution, at the expense of a higher
latency. Ignored if [static_image_mode](#static_image_mode) is `true`, where
person detection simply runs on every image. Default to `0.5`.

### Output

Naming style may differ slightly across platforms/languages.

#### pose_landmarks

A list of pose landmarks. Each landmark consists of the following:

*   `x` and `y`: Landmark coordinates normalized to `[0.0, 1.0]` by the image
    width and height respectively.
*   `z`: Should be discarded as currently the model is not fully trained to
    predict depth, but this is something on the roadmap.
*   `visibility`: A value in `[0.0, 1.0]` indicating the likelihood of the
    landmark being visible (present and not occluded) in the image.

#### face_landmarks

A list of 468 face landmarks. Each landmark consists of `x`, `y` and `z`. `x`
and `y` are normalized to `[0.0, 1.0]` by the image width and height
respectively. `z` represents the landmark depth with the depth at center of the
head being the origin, and the smaller the value the closer the landmark is to
the camera. The magnitude of `z` uses roughly the same scale as `x`.

#### left_hand_landmarks

A list of 21 hand landmarks on the left hand. Each landmark consists of `x`, `y`
and `z`. `x` and `y` are normalized to `[0.0, 1.0]` by the image width and
height respectively. `z` represents the landmark depth with the depth at the
wrist being the origin, and the smaller the value the closer the landmark is to
the camera. The magnitude of `z` uses roughly the same scale as `x`.

#### right_hand_landmarks

A list of 21 hand landmarks on the right hand, in the same representation as
[left_hand_landmarks](#left_hand_landmarks).

### Python Solution API

Please first follow general [instructions](../getting_started/python.md) to
install MediaPipe Python package, then learn more in the companion [Colab] and
the following usage example.

Supported configuration options:

*   [static_image_mode](#static_image_mode)
*   [upper_body_only](#upper_body_only)
*   [smooth_landmarks](#smooth_landmarks)
*   [min_detection_confidence](#min_detection_confidence)
*   [min_tracking_confidence](#min_tracking_confidence)

```python
import cv2
import mediapipe as mp
mp_drawing = mp.solutions.drawing_utils
mp_holistic = mp.solutions.holistic

# For static images:
holistic = mp_holistic.Holistic(static_image_mode=True)
for idx, file in enumerate(file_list):
  image = cv2.imread(file)
  image_hight, image_width, _ = image.shape
  # Convert the BGR image to RGB before processing.
  results = holistic.process(cv2.cvtColor(image, cv2.COLOR_BGR2RGB))

  if results.pose_landmarks:
    print(
        f'Nose coordinates: ('
        f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].x * image_width}, '
        f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].y * image_hight})'
    )
  # 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)
  mp_drawing.draw_landmarks(
      annotated_image, results.left_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
  mp_drawing.draw_landmarks(
      annotated_image, results.right_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
  mp_drawing.draw_landmarks(
      annotated_image, results.pose_landmarks, mp_holistic.POSE_CONNECTIONS)
  cv2.imwrite('/tmp/annotated_image' + str(idx) + '.png', annotated_image)
holistic.close()

# For webcam input:
holistic = mp_holistic.Holistic(
    min_detection_confidence=0.5, min_tracking_confidence=0.5)
cap = cv2.VideoCapture(0)
while cap.isOpened():
  success, image = cap.read()
  if not success:
    print("Ignoring empty camera frame.")
    # If loading a video, use 'break' instead of 'continue'.
    continue

  # Flip the image horizontally for a later selfie-view display, and convert
  # the BGR image to RGB.
  image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
  # To improve performance, optionally mark the image as not writeable to
  # pass by reference.
  image.flags.writeable = False
  results = holistic.process(image)

  # Draw landmark annotation on the image.
  image.flags.writeable = True
  image = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)
  mp_drawing.draw_landmarks(
      image, results.face_landmarks, mp_holistic.FACE_CONNECTIONS)
  mp_drawing.draw_landmarks(
      image, results.left_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
  mp_drawing.draw_landmarks(
      image, results.right_hand_landmarks, mp_holistic.HAND_CONNECTIONS)
  mp_drawing.draw_landmarks(
      image, results.pose_landmarks, mp_holistic.POSE_CONNECTIONS)
  cv2.imshow('MediaPipe Holistic', image)
  if cv2.waitKey(5) & 0xFF == 27:
    break
holistic.close()
cap.release()
```

### JavaScript Solution API

Please first see general [introduction](../getting_started/javascript.md) on
MediaPipe in JavaScript, then learn more in the companion [web demo] and the
following usage example.

Supported configuration options:

*   [upperBodyOnly](#upper_body_only)
*   [smoothLandmarks](#smooth_landmarks)
*   [minDetectionConfidence](#min_detection_confidence)
*   [minTrackingConfidence](#min_tracking_confidence)

```html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/camera_utils/camera_utils.js" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/control_utils/control_utils.js" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/drawing_utils/drawing_utils.js" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/@mediapipe/holistic/holistic.js" crossorigin="anonymous"></script>
</head>

<body>
  <div class="container">
    <video class="input_video"></video>
    <canvas class="output_canvas" width="1280px" height="720px"></canvas>
  </div>
</body>
</html>
```

```javascript
<script type="module">
const videoElement = document.getElementsByClassName('input_video')[0];
const canvasElement = document.getElementsByClassName('output_canvas')[0];
const canvasCtx = canvasElement.getContext('2d');

function onResults(results) {
  canvasCtx.save();
  canvasCtx.clearRect(0, 0, canvasElement.width, canvasElement.height);
  canvasCtx.drawImage(
      results.image, 0, 0, canvasElement.width, canvasElement.height);
  drawConnectors(canvasCtx, results.poseLandmarks, POSE_CONNECTIONS,
                 {color: '#00FF00', lineWidth: 4});
  drawLandmarks(canvasCtx, results.poseLandmarks,
                {color: '#FF0000', lineWidth: 2});
  drawConnectors(canvasCtx, results.faceLandmarks, FACEMESH_TESSELATION,
                 {color: '#C0C0C070', lineWidth: 1});
  drawConnectors(canvasCtx, results.leftHandLandmarks, HAND_CONNECTIONS,
                 {color: '#CC0000', lineWidth: 5});
  drawLandmarks(canvasCtx, results.leftHandLandmarks,
                {color: '#00FF00', lineWidth: 2});
  drawConnectors(canvasCtx, results.rightHandLandmarks, HAND_CONNECTIONS,
                 {color: '#00CC00', lineWidth: 5});
  drawLandmarks(canvasCtx, results.rightHandLandmarks,
                {color: '#FF0000', lineWidth: 2});
  canvasCtx.restore();
}

const holistic = new Holistic({locateFile: (file) => {
  return `https://cdn.jsdelivr.net/npm/@mediapipe/holistic/${file}`;
}});
holistic.setOptions({
  upperBodyOnly: false,
  smoothLandmarks: true,
  minDetectionConfidence: 0.5,
  minTrackingConfidence: 0.5
});
holistic.onResults(onResults);

const camera = new Camera(videoElement, {
  onFrame: async () => {
    await holistic.send({image: videoElement});
  },
  width: 1280,
  height: 720
});
camera.start();
</script>
```

## Example Apps

Please first see general instructions for
[Android](../getting_started/android.md), [iOS](../getting_started/ios.md), and
[desktop](../getting_started/cpp.md) on how to build MediaPipe examples.

Note: To visualize a graph, copy the graph and paste it into
[MediaPipe Visualizer](https://viz.mediapipe.dev/). For more information on how
to visualize its associated subgraphs, please see
[visualizer documentation](../tools/visualizer.md).

### Mobile

*   Graph:
    [`mediapipe/graphs/holistic_tracking/holistic_tracking_gpu.pbtxt`](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/holistic_tracking/holistic_tracking_gpu.pbtxt)
*   Android target:
    [(or download prebuilt ARM64 APK)](https://drive.google.com/file/d/1o-Trp2GIRitA0OvmZWUQjVMa476xpfgK/view?usp=sharing)
    [`mediapipe/examples/android/src/java/com/google/mediapipe/apps/holistictrackinggpu:holistictrackinggpu`](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/src/java/com/google/mediapipe/apps/holistictrackinggpu/BUILD)
*   iOS target:
    [`mediapipe/examples/ios/holistictrackinggpu:HolisticTrackingGpuApp`](http:/mediapipe/examples/ios/holistictrackinggpu/BUILD)

### Desktop

Please first see general instructions for [desktop](../getting_started/cpp.md)
on how to build MediaPipe examples.

*   Running on CPU
    *   Graph:
        [`mediapipe/graphs/holistic_tracking/holistic_tracking_cpu.pbtxt`](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/holistic_tracking/holistic_tracking_cpu.pbtxt)
    *   Target:
        [`mediapipe/examples/desktop/holistic_tracking:holistic_tracking_cpu`](https://github.com/google/mediapipe/tree/master/mediapipe/examples/desktop/holistic_tracking/BUILD)
*   Running on GPU
    *   Graph:
        [`mediapipe/graphs/holistic_tracking/holistic_tracking_gpu.pbtxt`](https://github.com/google/mediapipe/tree/master/mediapipe/graphs/holistic_tracking/holistic_tracking_gpu.pbtxt)
    *   Target:
        [`mediapipe/examples/desktop/holistic_tracking:holistic_tracking_gpu`](https://github.com/google/mediapipe/tree/master/mediapipe/examples/desktop/holistic_tracking/BUILD)

## Resources

*   Google AI Blog:
    [MediaPipe Holistic - Simultaneous Face, Hand and Pose Prediction on Device](https://ai.googleblog.com/2020/08/on-device-real-time-body-pose-tracking.html)
*   [Models and model cards](./models.md#holistic)

[Colab]:https://mediapipe.page.link/holistic_py_colab

[web demo]:https://code.mediapipe.dev/codepen/holistic