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Hi Luek,

By using Mat() as the third argument on erode you are using de default 3x3 structuring element, which might be too small for your case. You should experiment with larger sizes/different shapes of structuring element until you achieve satisfying results..

You can try something like this:

int size = 6; //Play with this size until you get the results you want
erode ( quad, quad, cv::getStructuringElement ( MORPH_RECT, size ), cv::Point ( -1, -1 ), 2, 1 , 1);