Question

我在opencv人脸检测示例中实现JavaCamera2View。该应用程序能够执行捏动作并识别并计算Rect的大小。但是，屏幕根本无法放大或缩小。什么也没发生。因此我创建了实现JavaCamera2View的新类，以便我有更多空间来编写自己的代码。

所以在我的FdActivity中，我实现了OnTouchListener：

private zoomcameraview   mOpenCvCameraView;
.
.


mOpenCvCameraView.enableView();
mOpenCvCameraView.setOnTouchListener(FdActivity.this);
.
.
@Override
    public boolean onTouch(View view, MotionEvent motionEvent) {

        return mOpenCvCameraView.setTouch(view,motionEvent, String.valueOf(cameraId));

    }

我在zoomcameraview内实现JavaCamera2View：

 private float getFingerSpacing(MotionEvent event) {
        float x = event.getX(0) - event.getX(1);
        float y = event.getY(0) - event.getY(1);
        return (float) Math.sqrt(x * x + y * y);
    }


    public boolean setTouch(View view, MotionEvent motionEvent, String camId) {
        mPreviewRequestBuilder = getmPreviewRequestBuilder();
        mCaptureSession = getmCaptureSession();
        Log.d("run on touch iside", "onTouch: motion count " +motionEvent.getPointerCount());
        try {

            CameraManager manager = (CameraManager) getContext().getSystemService(Context.CAMERA_SERVICE);
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(camId);
            float maxzoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;

            Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
            int action = motionEvent.getAction();
            float current_finger_spacing;

            if (motionEvent.getPointerCount() > 1) {
                // Multi touch logic
                current_finger_spacing = getFingerSpacing(motionEvent);
                Log.d("finger", "setTouch: " + finger_spacing);
                if(finger_spacing != 0){
                    if(current_finger_spacing > finger_spacing && maxzoom > zoom_level){
                        zoom_level++;
                    } else if (current_finger_spacing < finger_spacing && zoom_level > 1){
                        zoom_level--;
                    }
                    Log.d("zoom level", "setTouch: " + zoom_level);
                    int minW = (int) (m.width() / maxzoom);
                    int minH = (int) (m.height() / maxzoom);
                    int difW = m.width() - minW;
                    int difH = m.height() - minH;
                    int cropW = difW /100 *(int)zoom_level;
                    int cropH = difH /100 *(int)zoom_level;
                    cropW -= cropW & 3;
                    cropH -= cropH & 3;
                    Rect zoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
                    mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, zoom);
                }
                finger_spacing = current_finger_spacing;
            } else{
                return true;
//                if (action == MotionEvent.ACTION_UP) {
//                    return true;
//                    //single touch logic
//                }
            }

            try {
                mCaptureSession
                        .setRepeatingRequest(mPreviewRequestBuilder.build(), null, getmBackgroundHandler());
            } catch (CameraAccessException e) {
                e.printStackTrace();
            } catch (NullPointerException ex) {
                ex.printStackTrace();
            }
        } catch (CameraAccessException e) {
            throw new RuntimeException("can not access camera.", e);
        }
        return true;
    }

在JavaCamera2View中，我设置了getter和setter

public CaptureRequest.Builder getmPreviewRequestBuilder() {
        return mPreviewRequestBuilder;
    }

    public void setmPreviewRequestBuilder(CaptureRequest.Builder mPreviewRequestBuilder) {
        this.mPreviewRequestBuilder = mPreviewRequestBuilder;
    }

    public CameraCaptureSession getmCaptureSession() {
        return mCaptureSession;
    }

    public void setmCaptureSession(CameraCaptureSession mCaptureSession) {
        this.mCaptureSession = mCaptureSession;
    }

    public CameraDevice.StateCallback getmStateCallback() {
        return mStateCallback;
    }

    public Handler getmBackgroundHandler() {
        return mBackgroundHandler;
    }

    public void setmBackgroundHandler(Handler mBackgroundHandler) {
        this.mBackgroundHandler = mBackgroundHandler;
    }

我不确定出什么问题，但是缩放没有实现，但没有错误。

Answer 1

很抱歉，经过数天的尝试，我终于解决了。实施

public boolean setTouch(View view, MotionEvent motionEvent, String camId) {
        mPreviewRequestBuilder = getmPreviewRequestBuilder();
        mCaptureSession = getmCaptureSession();
        Log.d("run on touch iside", "onTouch: motion count " +motionEvent.getPointerCount());
        try {

            CameraManager manager = (CameraManager) getContext().getSystemService(Context.CAMERA_SERVICE);
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(camId);
            float maxzoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;

            Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
            int action = motionEvent.getAction();
            float current_finger_spacing;

            if (motionEvent.getPointerCount() > 1) {
                // Multi touch logic
                current_finger_spacing = getFingerSpacing(motionEvent);
                Log.d("finger", "setTouch: " + finger_spacing);
                if(finger_spacing != 0){
                    if(current_finger_spacing > finger_spacing && maxzoom > zoom_level){
                        zoom_level++;
                    } else if (current_finger_spacing < finger_spacing && zoom_level > 1){
                        zoom_level--;
                    }
                    Log.d("zoom level", "setTouch: " + zoom_level);
                    int minW = (int) (m.width() / maxzoom);
                    int minH = (int) (m.height() / maxzoom);
                    int difW = m.width() - minW;
                    int difH = m.height() - minH;
                    int cropW = difW /100 *(int)zoom_level;
                    int cropH = difH /100 *(int)zoom_level;
                    cropW -= cropW & 3;
                    cropH -= cropH & 3;
                    Rect zoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
                    mPreviewRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, zoom);
                }
                finger_spacing = current_finger_spacing;
            } else{
                return true;
//                if (action == MotionEvent.ACTION_UP) {
//                    return true;
//                    //single touch logic
//                }
            }

            try {
                mCaptureSession
                        .setRepeatingRequest(mPreviewRequestBuilder.build(), null, getmBackgroundHandler());
            } catch (CameraAccessException e) {
                e.printStackTrace();
            } catch (NullPointerException ex) {
                ex.printStackTrace();
            }
        } catch (CameraAccessException e) {
            throw new RuntimeException("can not access camera.", e);
        }
        return true;
    }

直接在FdAcitvity上解决了我的问题。现在正确实现了带camera2和pich缩放功能的opencv android

谢谢

JavaCamera2View捏缩放

1 个答案: