android人脸识别项目FaceDetector--------研究之二

项目已经完工了，有时间我就把这些用到内容详细记录一下，今天重点就是说下人脸识别框的第一种实现方式，通过FaceDetector类，这个我相信大家随便百度一下资料很多，首先实例化

FaceDetector mFaceDetector = new FaceDetector(myBitmap.getWidth(),myBitmap.getHeight(),numOfFaces);

numOfFaces = mFaceDetector.findFaces(myBitmap, mFace);

myBitmap必须是Bitmap.Config.RGB_565的

再通过已实例化的FindFaceView调用drawRects方法即可实现

/**
* com.honest.facerecognition.view.FindFaceView
* @author crayfish   <br/>
* create at 2015-3-27 下午3:42:56
*/
public class FindFaceView extends SurfaceView implements SurfaceHolder.Callback{

protected SurfaceHolder sh;
private  SurfaceHolder mCameraSh;
private int mWidth;
private int mHeight;

public FindFaceView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
sh = getHolder();
sh.addCallback(this);
sh.setFormat(PixelFormat.TRANSPARENT);
setZOrderOnTop(true);
}

public void surfaceChanged(SurfaceHolder arg0, int arg1, int w, int h) {
// TODO Auto-generated method stub
mWidth = w;
mHeight = h;
}

public void surfaceCreated(SurfaceHolder arg0) {
// TODO Auto-generated method stub

}

public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub

}

void setCameraPreviewSurfaceHolder(SurfaceHolder  sh) {
mCameraSh = sh;
}
public int getFaceViewWidth() {
return mWidth;
}
public int getFaceViewHeight() {
return mHeight;
}

public void clearDraw() {
Canvas canvas = sh.lockCanvas();
Paint clipPaint = new Paint();
clipPaint.setAntiAlias(true);
clipPaint.setStyle(Paint.Style.STROKE);
clipPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
canvas.drawPaint(clipPaint);
sh.unlockCanvasAndPost(canvas);
}
public void drawRects(Face[] mFaces) {
Canvas canvas = sh.lockCanvas();

Paint clipPaint = new Paint();
clipPaint.setAntiAlias(true);
clipPaint.setStyle(Paint.Style.STROKE);
clipPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
canvas.drawPaint(clipPaint);

canvas.drawColor(Color.TRANSPARENT);
Paint p = new Paint();
p.setAntiAlias(true);
p.setColor(Color.YELLOW);
p.setStrokeWidth(3f);
p.setStyle(Style.STROKE);

//		  for (int i = 0; i < mFaces.length; i++) {
//  if (0 == i) {
//   p.setColor(Color.WHITE);
//  } else {
//   p.setColor(Color.GRAY);
//  }
//			   Face face = mFace[i];
//			   PointF myMidPoint = new PointF();
//			   face.getMidPoint(myMidPoint);
//			   mEyesDistance = face.eyesDistance();
//			   Log.i("Harrison", "i="+i+"("+myMidPoint.x+", "+myMidPoint.y+")");
//			   canvas.drawRect((int)(myMidPoint.x-mEyesDistance),
//		      (int)(myMidPoint.y-mEyesDistance),
//		      (int)(myMidPoint.x+mEyesDistance),
//		      (int)(myMidPoint.y+mEyesDistance),
//		       p);
RectF mRect = new RectF();
Matrix matrix = new Matrix();
FaceDectionUtil.PrepareMatrix(matrix, false, 90, getWidth(), getHeight());//后置false

for(int i = 0;i < mFaces.length; i++ ){
mRect.set(mFaces[i].rect);
matrix.mapRect(mRect);
canvas.drawRect(mRect, p);
}

//		  }
sh.unlockCanvasAndPost(canvas);
}

//测试两个View是否错移
public void drawBitmap(Bitmap myBitmap) {
Canvas canvas = sh.lockCanvas();
canvas.drawBitmap(myBitmap, 0, 0, null);
sh.unlockCanvasAndPost(canvas);
// mImage.setImageBitmap(myBitmap);
// mImage.invalidate();
}
public void doDraw() {
Canvas canvas = sh.lockCanvas();
canvas.drawColor(Color.TRANSPARENT);// 这里是绘制背景
Paint p = new Paint(); // 笔触
p.setAntiAlias(true); // 反锯齿
p.setColor(Color.RED);
p.setStyle(Style.STROKE);
canvas.drawLine(mWidth/2 - 100, 0, mWidth/2 - 100, mHeight, p);
canvas.drawLine(mWidth/2 + 100, 0, mWidth/2 + 100, mHeight, p);
// ------------------------
// 画边框---------------------
Rect rec = canvas.getClipBounds();
rec.bottom--;
rec.right--;
p.setColor(Color.GRAY);
// 颜色
p.setStrokeWidth(5);
canvas.drawRect(rec, p);
// 提交绘制
sh.unlockCanvasAndPost(canvas);
}
}