setting opencv video to fullscreen android

Question

i am trying to set a video to fullscreen using opencv. the input is coming from the camera. it shows on the screen in the center but not as full screen. relevant code: ``` public class Sample3Native extends Activity implements CvCameraViewListener { private static final String TAG = "OCVSample::Activity"; private Mat mRgba; private Mat mGrayMat; private Mat mFinalMat; private CameraBridgeViewBase mOpenCvCameraView; private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) { @Override public void onManagerConnected(int status) { switch (status) { case LoaderCallbackInterface.SUCCESS: { Log.i(TAG, "OpenCV loaded successfully"); // Load native library after(!) OpenCV initialization System.loadLibrary("native_sample"); mOpenCvCameraView.enableView(); } break; default: { super.onManagerConnected(status); } break; } } }; public Sample3Native() { Log.i(TAG, "Instantiated new " + this.getClass()); } /** Called when the activity is first created. */ @Override public void onCrea…

Accepted Answer

You can get a list of the available resolutions or setup manually.

If you want to get the list of the available sizes and get the optimal camera size.

```
   if (mOpenCvCameraView != null) {
        List<Size> sizes = mOpenCvCameraView.getSupportedPreviewSizes();
        int mFrameWidth = width;
        int mFrameHeight = height;

// selecting optimal camera size
        {

double minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - height) < minDiff) {
                    mFrameWidth = (int) size.width;
                    mFrameHeight = (int) size.height;
                    minDiff = Math.abs(size.height - height);
                }
            }
        }

mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, mFrameWidth);
        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, mFrameHeight);
    }
```

If the optimal camera size is not fullscreen, it is easy to get the great size that the camera support from the list.

Other option is to set manually the size:

```
        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_WIDTH, 1000);
        mOpenCvCameraView.set(Highgui.CV_CAP_PROP_FRAME_HEIGHT, 800);
```

The source of the code is from Face Detection OpenCV version 2.4.2.

setting opencv video to fullscreen android

Solution

Problem