feat(hand-recognition)

config.js

@@ -248,6 +248,10 @@ var config = {
     //     // Specifies whether there is a notification when you are the next speaker in line.
     //     disableNextSpeakerNotification: false,
 
+    //     // Specifies whether the raised hand recognition through the video stream will be enabled.
+    //     // The FaceLandmarks configuration needs to be enabled for this to work.
+    //     disableRaisedHandRecognition: false,
+
     //     // Specifies whether the raised hand will hide when someone becomes a dominant speaker or not.
     //     disableRemoveRaisedHandOnFocus: false,
     // },

react/features/base/config/configType.ts

@@ -491,6 +491,7 @@ export interface IConfig {
         disableLowerHandByModerator?: boolean;
         disableLowerHandNotification?: boolean;
         disableNextSpeakerNotification?: boolean;
+        disableRaisedHandRecognition?: boolean;
         disableRemoveRaisedHandOnFocus?: boolean;
     };
     readOnlyName?: boolean;

react/features/base/config/functions.any.ts

@@ -122,6 +122,16 @@ export function getDisableNextSpeakerNotification(state: IReduxState) {
     return state['features/base/config']?.raisedHands?.disableNextSpeakerNotification || false;
 }
 
+/**
+ * Selector used to get the disableRaisedHandRecognition.
+ *
+ * @param {Object} state - The global state.
+ * @returns {boolean}
+ */
+export function getDisableRaisedHandRecognition(state: IReduxState) {
+    return state['features/base/config']?.raisedHands?.disableRaisedHandRecognition || false;
+}
+
 /**
  * Selector used to get the endpoint used for fetching the recording.
  *

react/features/face-landmarks/FaceLandmarksDetector.ts

@@ -1,7 +1,10 @@
 import 'image-capture';
 import './createImageBitmap';
 import { IStore } from '../app/types';
+import { getDisableRaisedHandRecognition } from '../base/config/functions.any';
 import { isMobileBrowser } from '../base/environment/utils';
+import { raiseHand } from '../base/participants/actions';
+import { getLocalParticipant, hasRaisedHand } from '../base/participants/functions';
 import { getLocalVideoTrack } from '../base/tracks/functions';
 import { getBaseUrl } from '../base/util/helpers';
 
@@ -11,12 +14,13 @@ import {
     newFaceBox
 } from './actions';
 import {
+    DETECT,
     DETECTION_TYPES,
-    DETECT_FACE,
     FACE_LANDMARKS_DETECTION_ERROR_THRESHOLD,
     INIT_WORKER,
     NO_DETECTION,
     NO_FACE_DETECTION_THRESHOLD,
+    RAISED_HAND_DURATION,
     WEBHOOK_SEND_TIME_INTERVAL
 } from './constants';
 import {
@@ -35,6 +39,7 @@ class FaceLandmarksDetector {
     private worker: Worker | null = null;
     private lastFaceExpression: string | null = null;
     private lastFaceExpressionTimestamp: number | null = null;
+    private lastRaisedHandTimestamp: number | null = null;
     private webhookSendInterval: number | null = null;
     private detectionInterval: number | null = null;
     private recognitionActive = false;
@@ -107,8 +112,19 @@ class FaceLandmarksDetector {
         workerUrl = window.URL.createObjectURL(workerBlob);
         this.worker = new Worker(workerUrl, { name: 'Face Landmarks Worker' });
         this.worker.onmessage = ({ data }: MessageEvent<any>) => {
-            const { faceExpression, faceBox, faceCount } = data;
+            const { faceExpression, faceBox, faceCount, raisedHand } = data;
             const messageTimestamp = Date.now();
+            const localParticipant = getLocalParticipant(getState());
+
+            if (!hasRaisedHand(localParticipant) && raisedHand) {
+                if (!this.lastRaisedHandTimestamp) {
+                    this.lastRaisedHandTimestamp = messageTimestamp;
+                }
+                if (messageTimestamp - this.lastRaisedHandTimestamp >= RAISED_HAND_DURATION) {
+                    dispatch(raiseHand(true));
+                    this.lastRaisedHandTimestamp = null;
+                }
+            }
 
             // if the number of faces detected is different from 1 we do not take into consideration that detection
             if (faceCount !== 1) {
@@ -155,7 +171,8 @@ class FaceLandmarksDetector {
         const { faceLandmarks } = state['features/base/config'];
         const detectionTypes = [
             faceLandmarks?.enableFaceCentering && DETECTION_TYPES.FACE_BOX,
-            faceLandmarks?.enableFaceExpressionsDetection && DETECTION_TYPES.FACE_EXPRESSIONS
+            faceLandmarks?.enableFaceExpressionsDetection && DETECTION_TYPES.FACE_EXPRESSIONS,
+            !getDisableRaisedHandRecognition(getState()) && DETECTION_TYPES.RAISED_HAND
         ].filter(Boolean);
 
         this.worker.postMessage({
@@ -341,7 +358,7 @@ class FaceLandmarksDetector {
         }
 
         this.worker.postMessage({
-            type: DETECT_FACE,
+            type: DETECT,
             image,
             threshold: faceCenteringThreshold
         });

react/features/face-landmarks/FaceLandmarksHelper.ts

@@ -1,13 +1,19 @@
 import { setWasmPaths } from '@tensorflow/tfjs-backend-wasm';
-import { Config, FaceResult, Human } from '@vladmandic/human';
-
-import { DETECTION_TYPES, FACE_DETECTION_SCORE_THRESHOLD, FACE_EXPRESSIONS_NAMING_MAPPING } from './constants';
+import { Config, FaceResult, HandResult, Human } from '@vladmandic/human';
+
+import {
+    DETECTION_TYPES,
+    FACE_DETECTION_SCORE_THRESHOLD,
+    FACE_EXPRESSIONS_NAMING_MAPPING,
+    HAND_DETECTION_SCORE_THRESHOLD
+} from './constants';
 import { DetectInput, DetectOutput, FaceBox, FaceExpression, InitInput } from './types';
 
 export interface IFaceLandmarksHelper {
     detect: ({ image, threshold }: DetectInput) => Promise<DetectOutput>;
     getDetectionInProgress: () => boolean;
-    getDetections: (image: ImageBitmap | ImageData) => Promise<Array<FaceResult>>;
+    getDetections: (image: ImageBitmap | ImageData) =>
+        Promise<{ faceDetections: FaceResult[]; handDetections: HandResult[]; }>;
     getFaceBox: (detections: Array<FaceResult>, threshold: number) => FaceBox | undefined;
     getFaceCount: (detections: Array<FaceResult>) => number;
     getFaceExpression: (detections: Array<FaceResult>) => FaceExpression | undefined;
@@ -19,7 +25,7 @@ export interface IFaceLandmarksHelper {
  */
 export class HumanHelper implements IFaceLandmarksHelper {
     protected human: Human | undefined;
-    protected faceDetectionTypes: string[];
+    protected detectionTypes: string[];
     protected baseUrl: string;
     private detectionInProgress = false;
     private lastValidFaceBox: FaceBox | undefined;
@@ -52,7 +58,22 @@ export class HumanHelper implements IFaceLandmarksHelper {
             },
             description: { enabled: false }
         },
-        hand: { enabled: false },
+        hand: {
+            enabled: false,
+            rotation: false,
+            skipFrames: 99,
+            skipTime: 1000,
+            minConfidence: 0.50,
+            iouThreshold: 0.2,
+            maxDetected: 2, // not the default value
+            landmarks: true,
+            detector: {
+                modelPath: 'handtrack.json'
+            },
+            skeleton: {
+                modelPath: 'handlandmark-lite.json'
+            }
+        },
         gesture: { enabled: false },
         body: { enabled: false },
         segmentation: { enabled: false }
@@ -65,7 +86,7 @@ export class HumanHelper implements IFaceLandmarksHelper {
      * @returns {void}
      */
     constructor({ baseUrl, detectionTypes }: InitInput) {
-        this.faceDetectionTypes = detectionTypes;
+        this.detectionTypes = detectionTypes;
         this.baseUrl = baseUrl;
         this.init();
     }
@@ -85,18 +106,24 @@ export class HumanHelper implements IFaceLandmarksHelper {
                 setWasmPaths(this.baseUrl);
             }
 
-            if (this.faceDetectionTypes.length > 0 && this.config.face) {
+            if ((this.detectionTypes.includes(DETECTION_TYPES.FACE_BOX)
+                || this.detectionTypes.includes(DETECTION_TYPES.FACE_EXPRESSIONS))
+                && this.config.face) {
                 this.config.face.enabled = true;
             }
 
-            if (this.faceDetectionTypes.includes(DETECTION_TYPES.FACE_BOX) && this.config.face?.detector) {
+            if (this.detectionTypes.includes(DETECTION_TYPES.FACE_BOX) && this.config.face?.detector) {
                 this.config.face.detector.enabled = true;
             }
 
-            if (this.faceDetectionTypes.includes(DETECTION_TYPES.FACE_EXPRESSIONS) && this.config.face?.emotion) {
+            if (this.detectionTypes.includes(DETECTION_TYPES.FACE_EXPRESSIONS) && this.config.face?.emotion) {
                 this.config.face.emotion.enabled = true;
             }
 
+            if (this.detectionTypes.includes(DETECTION_TYPES.RAISED_HAND) && this.config.hand) {
+                this.config.hand.enabled = true;
+            }
+
             const initialHuman = new Human(this.config);
 
             try {
@@ -159,6 +186,34 @@ export class HumanHelper implements IFaceLandmarksHelper {
         }
     }
 
+    /**
+     * Check whether the hand is raised from the hand detection result.
+     *
+     * @param {Array<HandResult>} handDetections - The array with the hand detections.
+     * @returns {boolean}
+     */
+    isRaisedHand(handDetections: Array<HandResult>): boolean {
+        // Only take the fingers with the hand of the max confidence score
+        const [ { landmarks: fingers = undefined, label: handLabel = undefined } = {} ] = handDetections;
+
+        if (handLabel !== 'hand') {
+            return false;
+        }
+
+        const validDirections = [ 'verticalUp', 'diagonalUpRight', 'diagonalUpLeft' ];
+        let counter = 0;
+
+        if (fingers) {
+            Object.values(fingers).forEach(value => {
+                if (value.curl === 'none' && validDirections.includes(value.direction)) {
+                    counter += 1;
+                }
+            });
+        }
+
+        return counter > 3;
+    }
+
     /**
      * Gets the face count from the detections, which is the number of detections.
      *
@@ -178,21 +233,29 @@ export class HumanHelper implements IFaceLandmarksHelper {
      *
      * @param {ImageBitmap | ImageData} image - The image captured from the track,
      * if OffscreenCanvas available it will be ImageBitmap, otherwise it will be ImageData.
-     * @returns {Promise<Array<FaceResult>>}
+     * @returns {Promise<{ faceDetections: Array<FaceResult>, handDetections: Array<HandResult> }>}
      */
-    async getDetections(image: ImageBitmap | ImageData): Promise<Array<FaceResult>> {
-        if (!this.human || !this.faceDetectionTypes.length) {
-            return [];
+    async getDetections(image: ImageBitmap | ImageData):
+    Promise<{ faceDetections: Array<FaceResult>; handDetections: Array<HandResult>; } > {
+        if (!this.human || !this.detectionTypes.length) {
+            return { faceDetections: [],
+                handDetections: [] };
         }
 
         this.human.tf.engine().startScope();
 
         const imageTensor = this.human.tf.browser.fromPixels(image);
-        const { face: detections } = await this.human.detect(imageTensor, this.config);
+        const { face: faceDetections, hand: handDetections } = await this.human.detect(imageTensor, this.config);
 
         this.human.tf.engine().endScope();
 
-        return detections.filter(detection => detection.score > FACE_DETECTION_SCORE_THRESHOLD);
+        const faceDetection = faceDetections.filter(detection => detection.score > FACE_DETECTION_SCORE_THRESHOLD);
+        const handDetection = handDetections.filter(detection => detection.score > HAND_DETECTION_SCORE_THRESHOLD);
+
+        return {
+            faceDetections: faceDetection,
+            handDetections: handDetection
+        };
     }
 
     /**
@@ -204,19 +267,20 @@ export class HumanHelper implements IFaceLandmarksHelper {
     public async detect({ image, threshold }: DetectInput): Promise<DetectOutput> {
         let faceExpression;
         let faceBox;
+        let raisedHand;
 
         this.detectionInProgress = true;
 
-        const detections = await this.getDetections(image);
+        const { faceDetections, handDetections } = await this.getDetections(image);
 
-        if (this.faceDetectionTypes.includes(DETECTION_TYPES.FACE_EXPRESSIONS)) {
-            faceExpression = this.getFaceExpression(detections);
+        if (this.detectionTypes.includes(DETECTION_TYPES.FACE_EXPRESSIONS)) {
+            faceExpression = this.getFaceExpression(faceDetections);
         }
 
-        if (this.faceDetectionTypes.includes(DETECTION_TYPES.FACE_BOX)) {
+        if (this.detectionTypes.includes(DETECTION_TYPES.FACE_BOX)) {
             // if more than one face is detected the face centering will be disabled.
-            if (this.getFaceCount(detections) > 1) {
-                this.faceDetectionTypes.splice(this.faceDetectionTypes.indexOf(DETECTION_TYPES.FACE_BOX), 1);
+            if (this.getFaceCount(faceDetections) > 1) {
+                this.detectionTypes.splice(this.detectionTypes.indexOf(DETECTION_TYPES.FACE_BOX), 1);
 
                 // face-box for re-centering
                 faceBox = {
@@ -225,17 +289,22 @@ export class HumanHelper implements IFaceLandmarksHelper {
                     width: 100
                 };
             } else {
-                faceBox = this.getFaceBox(detections, threshold);
+                faceBox = this.getFaceBox(faceDetections, threshold);
             }
 
         }
 
+        if (this.detectionTypes.includes(DETECTION_TYPES.RAISED_HAND)) {
+            raisedHand = this.isRaisedHand(handDetections);
+        }
+
         this.detectionInProgress = false;
 
         return {
             faceExpression,
             faceBox,
-            faceCount: this.getFaceCount(detections)
+            faceCount: this.getFaceCount(faceDetections),
+            raisedHand
         };
     }
 

react/features/face-landmarks/constants.ts

@@ -26,6 +26,11 @@ export const FACE_EXPRESSIONS_NAMING_MAPPING = {
  */
 export const WEBHOOK_SEND_TIME_INTERVAL = 15000;
 
+/**
+ * Time is ms used for checking raised hand duration.
+ */
+export const RAISED_HAND_DURATION = 2000;
+
 /**
  * Type of message sent from main thread to worker that contains init information:
  * such as models directory and window screen size.
@@ -49,23 +54,29 @@ export const SEND_IMAGE_INTERVAL_MS = 1000;
 
 /**
  * Type of message sent from main thread to worker that contain image data and
- * will trigger a response message from the worker containing the detected face(s) info.
+ * will trigger a response message from the worker containing the detected info.
  */
-export const DETECT_FACE = 'DETECT_FACE';
+export const DETECT = 'DETECT';
 
 /**
  * Available detection types.
  */
 export const DETECTION_TYPES = {
     FACE_BOX: 'face-box',
-    FACE_EXPRESSIONS: 'face-expressions'
+    FACE_EXPRESSIONS: 'face-expressions',
+    RAISED_HAND: 'raised-hand'
 };
 
 /**
  * Threshold for detection score of face.
  */
 export const FACE_DETECTION_SCORE_THRESHOLD = 0.75;
 
+/**
+ * Threshold for detection score of hand.
+ */
+export const HAND_DETECTION_SCORE_THRESHOLD = 0.8;
+
 /**
  * Threshold for stopping detection after a certain number of consecutive errors have occurred.
  */

react/features/face-landmarks/faceLandmarksWorker.ts

@@ -1,15 +1,16 @@
 import { HumanHelper, IFaceLandmarksHelper } from './FaceLandmarksHelper';
-import { DETECT_FACE, INIT_WORKER } from './constants';
+import { DETECT, INIT_WORKER } from './constants';
 
 let helper: IFaceLandmarksHelper;
 
 onmessage = async function({ data }: MessageEvent<any>) {
     switch (data.type) {
-    case DETECT_FACE: {
+    case DETECT: {
         if (!helper || helper.getDetectionInProgress()) {
             return;
         }
 
+        // detections include both face detections and hand detections
         const detections = await helper.detect(data);
 
         if (detections) {

react/features/face-landmarks/types.ts

@@ -20,6 +20,7 @@ export type DetectOutput = {
     faceBox?: FaceBox;
     faceCount: number;
     faceExpression?: FaceExpression;
+    raisedHand?: boolean;
 };
 
 export type FaceExpression = {