Convolution edge finders

difedge(M) Performs edge-detection by differential convolution on matrix M.

freichen(M) Performs edge detection by Frei-Chen convolution on matrix M.

prewitt(M) Performs edge detection by Prewitt convolution on matrix M.

roberts(M) Performs edge detection by Roberts convolution on matrix M.

sobel(M) Performs edge detection by Sobel convolution on matrix M.

Arguments:

• M is an image matrix.