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answered 2013-02-20 04:00:15 -0600
The function computeGradient( img[, [grad, [angleOfs, [paddingTL, paddingBR]]]])-> grad, angleOfs seems to do what you want.
computeGradient( img[, [grad, [angleOfs, [paddingTL, paddingBR]]]])-> grad, angleOfs
