Sobel filters are also popular:-1 0 +1 -1 -2 -1 In a 3x3 window, subtracting (right-left) and (bottom-top) is one way to do this. The usual way to do this is through a pair of edge detection filters that compute horizontal and vertical gradient. For each pixel in the original image, the gradient map encodes a vector that indicates the direction and rate of fastest ascent in luminance.
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