I'm trying to create a simple helloworld in android, but not sure why it's not displayed what I return from onCameraFrame.
I'm using opencv 3.4.1 on android 8.0.0.
This dosen't draw anything:
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)
{
mRgba = inputFrame.rgba();
Imgproc.circle (
mRgba, //Matrix obj of the image
new Point(mWidth * 0.5, mHeight * 0.5), //Center of the circle
10, //Radius
new Scalar(0, 0, 255), //Scalar object for color
10 //Thickness of the circle
);
Log.i(TAG, "Called.");
return mRgba;
But Called appears in the prompt.
And neither this is working:
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)
{
return inputFrame.gray();
}
The image is still colored. I've searched a lot and tryied different solutions, and none of them worked :(
Here is the complete class code:
public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2
{
private static final String TAG = MainActivity.class.getCanonicalName();
private CameraBridgeViewBase mOpenCvCameraView;
private static final Scalar FACE_RECT_COLOR = new Scalar(0, 255, 0, 255);
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this)
{
@Override
public void onManagerConnected(int status)
{
switch (status)
{
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "OpenCV loaded successfully");
try
{
initializeOpenCVDependencies();
} catch (IOException e)
{
e.printStackTrace();
}
}
break;
default:
{
super.onManagerConnected(status);
}
break;
}
}
};
private Mat mRgba;
private Mat mGray;
private int mWidth;
private int mHeight;
private void initializeOpenCVDependencies() throws IOException
{
mOpenCvCameraView.enableView();
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA)
== PackageManager.PERMISSION_DENIED)
{
Log.i(TAG, "Requesting camera permissions because are: " +
ContextCompat.checkSelfPermission(this,
Manifest.permission.CAMERA));
requestPermissions(new String[]{Manifest.permission.CAMERA}, 13);
return;
}
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
}
});
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial1_activity_java_surface_view);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults)
{
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
Snackbar.make(findViewById(R.id.container), "Permission Granted",
Snackbar.LENGTH_LONG).show();
}
else
{
Snackbar.make(findViewById(R.id.container), "Permission denied",
Snackbar.LENGTH_LONG).show();
}
}
@Override
public void onResume()
{
super.onResume();
if (!OpenCVLoader.initDebug())
{
Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, this, mLoaderCallback);
}
else
{
Log.d(TAG, "OpenCV library found inside package. Using it!");
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
@Override
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
{
mOpenCvCameraView.disableView();
}
}
@Override
public void onCameraViewStarted(int width, int height)
{
mGray = new Mat(height, width, CvType.CV_8UC4);
mRgba = new Mat();
mWidth = width;
mHeight = height;
}
@Override
public void onCameraViewStopped()
{
mGray.release();
mRgba.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)
{
return inputFrame.gray();
}
}
