ImageView位图偏移校正

我正在尝试创建跨多个图像的人脸交换的实现。这些图像不是从相机拍摄的。它们是设备上的 .jpg 文件。

我需要使用谷歌的人脸检测API提取人脸图像的一部分。为此,我扩展了ImageView:

public class face提取器imageview extends imageview{

位图图像;
位图原图;

上下文上下文;
面部探测器;
sparsearray<face>面;
列表<rect>facerects;
布尔值更改=假;

人脸选择人脸;

公共FaceExtractorImageView(上下文上下文){
super(上下文);
this.context=上下文;

detector=new facedetector.builder(上下文)
.setEmergentFaceOnly(错误)
.setLandmarkType(人脸检测器。所有标志)
.build();
facerects=新数组列表<>();

//其他构造函数执行完全相同的操作。
}

@覆盖
公共void setimagebitmap(最终位图img){
图像=img;
selectedface=空;
如果(!)已更改)
原始图像=img;

更改=真;

super.setImageBitmap(img);
faces=detector.detect(new frame.builder().setBitmap(image.build());

facerects.clear();
对于(int i=0;i<faces.size();i++)
facerects.add(getfacerect(i));

setOntouchlistener(new Ontouchlistener()){
@覆盖
公共布尔型OnTouch(视图V,MotionEvent事件){
selectedface=空;
开关(event.getAction()){
case motionevent.action\u向上:
对于(int i=0;i<facerects.size();i++)
如果(facerects.get(i){
。包含((int)event.getx(),
(int)event.gety())事件{
selectedFace=面.valueat(i);
}
invalidate();





























public class FaceExtractorImageView extends ImageView {

    Bitmap image;
    Bitmap origImage;

    Context context;
    FaceDetector detector;
    SparseArray<Face> faces;
    List<Rect> faceRects;
    boolean changed = false;

    Face selectedFace;

    public FaceExtractorImageView(Context context) {
        super(context);
        this.context = context;

        detector = new FaceDetector.Builder(context)
                .setProminentFaceOnly(false)
                .setLandmarkType(FaceDetector.ALL_LANDMARKS)
                .build();
        faceRects = new ArrayList<>();

        //The other constructors do the exact same thing.
    }

    @Override
    public void setImageBitmap(final Bitmap img){
        image = img;
        selectedFace = null;
        if(!changed)
            origImage = img;

        changed =true;

        super.setImageBitmap(img);
        faces = detector.detect(new Frame.Builder().setBitmap(image).build());

        faceRects.clear();
        for(int i=0;i<faces.size();i++)
            faceRects.add(getFaceRect(i));

        setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                selectedFace = null;
                switch(event.getAction()){
                    case MotionEvent.ACTION_UP:
                        for(int i=0;i<faceRects.size();i++)
                            if(faceRects.get(i) {
                                .contains((int)event.getX(), 
                                (int)event.getY())) {
                               selectedFace = faces.valueAt(i);
                            }
                        invalidate();
                }
                return true;
            }
        });
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if(selectedFace!=null){
            Paint p = new Paint();
            p.setStyle(Paint.Style.STROKE);
            p.setColor(Color.RED);
            canvas.drawRect(getFaceRect(selectedFace), p);
        }
    }

    public Face getSelectedFace(){
        return selectedFace;
    }

    public Bitmap getSelectedFaceBitmap() {
        if(selectedFace==null)
            return null;

        int index = faces.indexOfValue(selectedFace);
        return getFaceBitmapWithIndex(index);
    }

    //Returns Bitmap of face with index @index form the currently set image
    public Bitmap getFaceBitmapWithIndex(int index) {
        return getFaceBitmapWithIndex(image, index);
    }


    //Returns Bitmap of face with index @index form image @src
    public Bitmap getFaceBitmapWithIndex(Bitmap src, int index) {
        Rect r = getFaceRect(index);
        Bitmap created = Bitmap.createBitmap(src, r.left, r.top, r.width(), r.height());
        ImageView v = new ImageView(context);
        v.setImageBitmap(created);
        //new AlertDialog.Builder(context).setView(v).create().show();
        return created;
    }


    public Rect getFaceRect(Face face){
        Rect r= new Rect();

        //The constant values used below are for cropping the original image.
        r.left = (int) face.getPosition().x + (int) face.getWidth() / 20;

        r.top = (int) face.getPosition().y + (int) face.getHeight() / 4;

        r.right = r.left + (int) (face.getWidth() * 5.75 / 10);

        r.bottom = r.top + (int) (face.getHeight() * 3 / 5);
        return r;
    }

    //Get rect for face at index @index of image @img
    public Rect getFaceRect(int index){
        Face face = faces.valueAt(index);
        if(face==null) {
            Log.e("Face not found", "The image in the view does not have a face with index "+index);
            return null;
        }

        return getFaceRect(face);
    }
}





invalidate()
RectgetFaceRect()
getFaceBitmapWithIndex()










onDraw()