Face detection

compile 'com.google.android.gms:play-services-vision:8.1.0' //=============================================================== <application> <meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="face"/> </> //=============================================================== package com.example.phamngoctuan.facerecogniz; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.util.AttributeSet; import android.util.SparseArray; import android.view.View; import com.google.android.gms.vision.Frame; import com.google.android.gms.vision.face.Face; import com.google.android.gms.vision.face.FaceDetector; /** * Created by phamngoctuan on 27/05/2016. */ public class FaceOverlayView extends View { private Bitmap mBitmap; private SparseArray<Face> mFaces; public FaceOverlayView(Context context) { this(context, null); } public FaceOverlayView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public FaceOverlayView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public void setBitmap( Bitmap bitmap ) { mBitmap = bitmap; FaceDetector detector = new FaceDetector.Builder( getContext() ) .setTrackingEnabled(false) .setLandmarkType(FaceDetector.ALL_LANDMARKS) .setMode(FaceDetector.FAST_MODE) .build(); if (!detector.isOperational()) { //Handle contingency } else { Frame frame = new Frame.Builder().setBitmap(bitmap).build(); mFaces = detector.detect(frame); detector.release(); } invalidate(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if ((mBitmap != null) && (mFaces != null)) { double scale = drawBitmap(canvas); drawFaceBox(canvas, scale); } } private double drawBitmap( Canvas canvas ) { double viewWidth = canvas.getWidth(); double viewHeight = canvas.getHeight(); double imageWidth = mBitmap.getWidth(); double imageHeight = mBitmap.getHeight(); double scale = Math.min( viewWidth / imageWidth, viewHeight / imageHeight ); Rect destBounds = new Rect( 0, 0, (int) ( imageWidth * scale ), (int) ( imageHeight * scale ) ); canvas.drawBitmap( mBitmap, null, destBounds, null ); return scale; } private void drawFaceBox(Canvas canvas, double scale) { //paint should be defined as a member variable rather than //being created on each onDraw request, but left here for //emphasis. Paint paint = new Paint(); paint.setColor(Color.GREEN); paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(5); float left = 0; float top = 0; float right = 0; float bottom = 0; for( int i = 0; i < mFaces.size(); i++ ) { Face face = mFaces.valueAt(i); left = (float) ( face.getPosition().x * scale ); top = (float) ( face.getPosition().y * scale ); right = (float) scale * ( face.getPosition().x + face.getWidth() ); bottom = (float) scale * ( face.getPosition().y + face.getHeight() ); canvas.drawRect( left, top, right, bottom, paint ); } } } //============================================= <com.example.phamngoctuan.facerecogniz.FaceOverlayView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/face_overlay" android:layout_width="match_parent" android:layout_height="match_parent" /> //============================================ mFaceOverlayView = (FaceOverlayView) findViewById( R.id.face_overlay ); Bitmap bitmap = BitmapFactory.decodeResource(getResources(), ids[id]); mFaceOverlayView.setBitmap(bitmap); Button next = (Button)findViewById(R.id.next); next.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { id = (id + 1) % 3; Bitmap bitmap = BitmapFactory.decodeResource(getResources(), ids[id]); mFaceOverlayView.setBitmap(bitmap); } });