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 public void onCameraViewStarted(int width, int height) {
        mRgba = new Mat(height, width, CvType.CV_8UC4);
        mIntermediateMat = new Mat(height, width, CvType.CV_8UC4);
        mGrayMat = new Mat(height, width, CvType.CV_8UC1);
CvType.CV_8UC1);

can someone explain me what are these CvType.CV_8UC4 and CV_8UC1??? this is from the tutorials provided by opencv for android