android - OpenCV Android-打开相机闪光灯

Question

我想在应用程序openCV打开后在相机中打开Flash Led，但无法访问相机:

mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial1_activity_native_surface_view);

//此行不起作用。设置方法不存在

mOpenCvCameraView.set(Highgui.CV_CAP_PROP_ANDROID_FLASH_MODE,Highgui.CV_CAP_ANDROID_FLASH_MODE_ON);

Answer 1

如果您使用的是openCV v3.0.0，则可以创建新类(来自带有一些修改的示例tutorial3):

public class Tutorial3View extends JavaCameraView implements PictureCallback {
    private String mPictureFileName;

    public Tutorial3View(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public List<String> getEffectList() {
        return mCamera.getParameters().getSupportedFlashModes();
    }
    public boolean isEffectSupported() {
        return (mCamera.getParameters().getFlashMode() != null);
    }
    public String getEffect() {
        return mCamera.getParameters().getFlashMode();
    }
    public void setEffect(String effect) {
        mCamera.getParameters();
        Camera.Parameters params = mCamera.getParameters();
        params.setFlashMode(effect);
        mCamera.setParameters(params);
    }
    public List<Size> getResolutionList() {
        return mCamera.getParameters().getSupportedPreviewSizes();
    }
    public void setResolution(int w, int h) {
        disconnectCamera();
        mMaxHeight = h;
        mMaxWidth = w;
        connectCamera(getWidth(), getHeight());
    }

    public Size getResolution() {
        return mCamera.getParameters().getPreviewSize();
    }

    public void takePicture(final String fileName) {
        this.mPictureFileName = fileName;
        // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
        // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
        mCamera.setPreviewCallback(null);

        // PictureCallback is implemented by the current class
        mCamera.takePicture(null, null, this);
    }

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        // The camera preview was automatically stopped. Start it again.
        mCamera.startPreview();
        mCamera.setPreviewCallback(this);

        // Write the image in a file (in jpeg format)
        try {
            FileOutputStream fos = new FileOutputStream(mPictureFileName);
            fos.write(data);
            fos.close();
        } catch (java.io.IOException e) {
            Log.e("PictureDemo", "Exception in photoCallback", e);
        }

    }

    public void cameraRelease() {
        if(mCamera != null){
            mCamera.release();
        }
    }
}

然后修改您的 Activity (用 Tutorial3View 代替 CameraBridgeViewBase ):

private Tutorial3View mOpenCVCameraView;   

mOpenCVCameraView = (Tutorial3View) findViewById(R.id.camera_surface_view);
mOpenCVCameraView.setCvCameraViewListener(this);
mOpenCVCameraView.setOnTouchListener(MainActivity.this);

//then you can set effect, for example torch:
mOpenCVCameraView.setEffect(Camera.Parameters.FLASH_MODE_TORCH);