FaceImageView.java

package com.survivingwithandroid.facedetection;
/*
 * Copyright (C) 2013 Surviving with Android (http://www.survivingwithandroid.com)
 *
 * 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.
 */

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.PointF;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;

public class FaceImageView extends ImageView {

	private static final int MAX_FACES = 10;
	private RectF[] rects = new RectF[MAX_FACES];
	private Bitmap image;
	
	public FaceImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public FaceImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public FaceImageView(Context context) {
		super(context);
	}
	
	

	@Override
	protected void onDraw(Canvas canvas) {		
		super.onDraw(canvas);
		Paint p = new Paint();
	
		
		
		canvas.drawBitmap(image, 0, 0, p);
		Paint rectPaint = new Paint();
		rectPaint.setStrokeWidth(2);
		rectPaint.setColor(Color.BLUE);
		rectPaint.setStyle(Style.STROKE);
		
		
		for (int i=0; i < MAX_FACES; i++) {
			RectF r = rects[i];
			if (r != null)
				canvas.drawRect(r, rectPaint);
		}
	}
	
	public void setImage(Bitmap image) {
		this.image = image;
	}

	public void detectFaces() {
		Log.d("FaceDet", "Detecting faces....");
		// Convert bitmap in 556
		
		Bitmap tmpBmp = image.copy(Config.RGB_565, true);
		
		
		
		FaceDetector faceDet = new FaceDetector(tmpBmp.getWidth(), tmpBmp.getHeight(), MAX_FACES);
		
		Face[] faceList = new Face[MAX_FACES];
		
		faceDet.findFaces(tmpBmp, faceList);
		
		// Log the result
		for (int i=0; i < faceList.length; i++) {
			Face face = faceList[i];
			Log.d("FaceDet", "Face ["+face+"]");
			if (face != null) {
				Log.d("FaceDet", "Face ["+i+"] - Confidence ["+face.confidence()+"]");
				PointF pf = new PointF();
				face.getMidPoint(pf);
				Log.d("FaceDet", "\t Eyes distance ["+face.eyesDistance()+"] - Face midpoint ["+pf+"]");
				RectF r = new RectF();
				r.left = pf.x - face.eyesDistance() / 2;
				r.right = pf.x + face.eyesDistance() / 2;
				r.top = pf.y - face.eyesDistance() / 2;
				r.bottom = pf.y + face.eyesDistance() / 2;
				rects[i] = r;
			}
		}
		
		this.invalidate();
	}
}