matlab code for rgb sobel operator
, 'replicate'); Ry = imfilter(double(R), sobel_x', 'replicate'); Gx = imfilter(double(G), sobel_x, 'replicate'); Gy = imfilter(double(G), sobel_x', 'replicate'); Bx = imfilter(double(B), sobel_x, 'replicate'); By = imfilter(double(B), sobel_x', 'replicate')