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answered 2019-04-12 09:03:07 -0600
see here:
cvtColor(image, gray, COLOR_BGR2GRAY);
probably laps[i].at<Vec3b>(x,y) must be laps[i].at<uchar>(x,y)
laps[i].at<Vec3b>(x,y)
laps[i].at<uchar>(x,y)
