Convolution and comparison edge finders

compgrad(M) Performs edge detection by comparing the gradients of the 8 neighbors on matrix M.

kirsch(M) Performs edge detection by kirsch convolution and comparison on matrix M.

robinson3(M) Performs edge detection by 3 x 3 Robinson convolution and comparison on matrix M.

robinson5(M) Performs edge detection by 5 x 5 Robinson convolution and comparison on matrix M.

Arguments:

• M is an image matrix.