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what about this:

rgbMat = inputFrame.rgba();
grayMat = inputFrame.gray();
double [] grayPixel = grayMat.get(0,0);
int grayVal = (int)grayPixel[0];    // now do your comparison

return rgbMat;

what about this:

rgbMat = inputFrame.rgba();
grayMat = inputFrame.gray();
double [] grayPixel = grayMat.get(0,0);
grayMat.get(1,1);
int grayVal = (int)grayPixel[0];    // now do your comparison

return rgbMat;

what how about this:

rgbMat = inputFrame.rgba();
grayMat = inputFrame.gray();
double [] grayPixel = grayMat.get(1,1);
int grayVal = (int)grayPixel[0];    // now do your comparison

return rgbMat;