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在得到使用圆形裁剪的建议后，我在我的应用程序中实现了它，用于从位图中提取人脸，但它的效率太低，我的意思是它没有用，类似于从矩形人脸裁剪。现在这是我到目前为止所做的：

  1. 推出相机
  2. 拍照
  3. 检测到图片中的人脸
  4. 已检测到在区域人脸中绘制矩形窗口

现在面临的严重问题是从该位图中获得面子。我只是想打脸。忽略面部检测窗口中的所有其他细节。如果是 matlab，在边缘检测技术和分割算法和函数的帮助下，它可能会变得过于简单。我想知道如何在 android 应用程序中执行相同的过程？如果你知道的话，请分享代码片段。这占用了我太多时间，我只想完成这个面部提取部分。

我到现在为止的代码：

public class Makeover extends Activity {
private static final int TAKE_PICTURE_CODE = 100;
private static final int MAX_FACES = 5;

private Bitmap cameraBitmap = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

((Button)findViewById(R.id.take_picture)).setOnClickListener(btnClick);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(TAKE_PICTURE_CODE == requestCode){
                processCameraImage(data);

        }
}

private void openCamera(){
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

startActivityForResult(intent, TAKE_PICTURE_CODE);
   }

private void processCameraImage(Intent intent){
setContentView(R.layout.detectlayout);

((Button)findViewById(R.id.detect_face)).setOnClickListener(btnClick);

ImageView imageView = (ImageView)findViewById(R.id.image_view);

cameraBitmap = (Bitmap)intent.getExtras().get("data");

imageView.setImageBitmap(cameraBitmap);
}

private void detectFaces(){
Bitmap bmFace = null;
if(null != cameraBitmap){
        int width = cameraBitmap.getWidth();
        int height = cameraBitmap.getHeight();

        FaceDetector detector = new FaceDetector(width, height,Makeover.MAX_FACES);
        Face[] faces = new Face[Makeover.MAX_FACES];

        Bitmap bitmap565 = Bitmap.createBitmap(width, height, Config.RGB_565);
        Paint ditherPaint = new Paint();
        Paint drawPaint = new Paint();

        //jo bhi krna hai ab bitmap565 k sath krna hai apse wo image hai main

        ditherPaint.setDither(true);
        drawPaint.setColor(Color.RED);
        drawPaint.setStyle(Paint.Style.STROKE);
        drawPaint.setStrokeWidth(2);

        Canvas canvas = new Canvas();
        canvas.setBitmap(bitmap565);
        canvas.drawBitmap(cameraBitmap, 0, 0, ditherPaint);

        int facesFound = detector.findFaces(bitmap565, faces);
        PointF midPoint = new PointF();
        float eyeDistance = 0.0f;
        float confidence = 0.0f;

        Log.i("FaceDetector", "Number of faces found: " + facesFound);

        if(facesFound > 0)
        {
                for(int index=0; index<facesFound; ++index){
                        faces[index].getMidPoint(midPoint);
                        eyeDistance = faces[index].eyesDistance();
                        confidence = faces[index].confidence();

                        Log.i("FaceDetector", 
                                        "Confidence: " + confidence + 
                                        ", Eye distance: " + eyeDistance + 
                                        ", Mid Point: (" + midPoint.x + ", " + midPoint.y + ")");

                        canvas.drawRect((int)midPoint.x - eyeDistance , 
                                                        (int)midPoint.y - eyeDistance , 
                                                        (int)midPoint.x + eyeDistance, 
                                                        (int)midPoint.y + eyeDistance, drawPaint);
                }
        }

        for(int count=0;count<detector.findFaces(bitmap565, faces);count++)
        {
            float left;
            float top;
            PointF midPoints=new PointF();
            faces[count].getMidPoint(midPoint);         
            eyeDistance=faces[count].eyesDistance();

            left = midPoint.x - (float)(1.4 * eyeDistance);
            top = midPoint.y - (float)(1.8 * eyeDistance);

            bmFace = Bitmap.createBitmap(cameraBitmap, (int) left, (int) top, (int) (2.8 * eyeDistance), (int) (3.6 * eyeDistance));          
        }


        String filepath = Environment.getExternalStorageDirectory() + "/facedetect" + System.currentTimeMillis() + ".jpg";

                try {
                        FileOutputStream fos = new FileOutputStream(filepath);

                        bitmap565.compress(CompressFormat.JPEG, 90, fos);

                        fos.flush();
                        fos.close();
                } catch (FileNotFoundException e) {
                        e.printStackTrace();
                } catch (IOException e) {
                        e.printStackTrace();
                }             
                ImageView imageView = (ImageView)findViewById(R.id.image_view);

                imageView.setImageBitmap(bmFace);
    }
}

private View.OnClickListener btnClick = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                switch(v.getId()){
                        case R.id.take_picture:         openCamera();   break;
                        case R.id.detect_face:          detectFaces();  break;  
                }
        }
};
}
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