opencv - 使用 OpenCV 在 Android 中更改图像分辨率

Question

我正在使用 JavaCameraView 和 OpencCV 捕获帧，但我卡在默认 620*480 分辨率，这不是我的要求我的手机可以支持 1280*720 分辨率，我一直在努力寻找许多天的解决方案，尝试了很多选项但无法更改默认图像/帧分辨率。

private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i("OpenCv", "OpenCV loaded successfully");
                mOpenCvCameraView.enableView();

            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

@Override
public void onResume()
{
    super.onResume();
    if (!OpenCVLoader.initDebug()) {
        Log.d("OpenCv", "Internal OpenCV library not found. Using OpenCV Manager for initialization");
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_11, this, mLoaderCallback);
    } else {
        Log.d("OpenCv", "OpenCV library found inside package. Using it!");
        mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
    }
}


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_camera);

    mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial1_activity_java_surface_view);
    mOpenCvCameraView.setMaxFrameSize(720,1280);
    mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
    mOpenCvCameraView.setCvCameraViewListener(this);
    }


@Override
public void onCameraViewStarted(int width, int height) {

    // Recieve Image Data when the caera preview starts
    mRgba = new Mat(height, width, CvType.CV_8UC4);
    mRgbaT = new Mat(height, width, CvType.CV_8UC4);
    mRgbaF = new Mat(height, width, CvType.CV_8UC4);
    //End

    mSpectrum = new Mat();
    mBlobColorRgba = new Scalar(255);
    mBlobColorHsv = new Scalar(255);
    SPECTRUM_SIZE = new Size(400, 400);
    CONTOUR_COLOR = new Scalar(255,0,0,255);

}


@Override
public void onCameraViewStopped() {
    mRgba.release();
}

@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {

     timeofFrame = System.currentTimeMillis();

    mRgba = inputFrame.rgba();

    Core.transpose(mRgba,mRgbaT);
    //Rotate 90 degrees//
    Imgproc.resize(mRgbaT,mRgbaF,mRgbaF.size(),0,0,0);
    Core.flip(mRgbaF,mRgba,1);

    return mRgba;

    }
}

Answer 1

如果您的 JavaCameraView 是横向显示的，您可以尝试更换您的

mOpenCvCameraView.setMaxFrameSize(720,1280);

到

mOpenCvCameraView.setMaxFrameSize(1280,720);

如果不是，请尝试在 manifest.xml 中更改事件类的方向，例如

<activity android:name="CameraActivity"
            android:screenOrientation="landscape" />

在那之后改变 MaxFrameSize:

mOpenCvCameraView.setMaxFrameSize(1280,720);