garyscale difference by row and column

dear sir i want to find grayscale difference by row as well as column for image recognition plz help in this code

Answer 1

[Image Analyst]

You can use imfilter, conv2, or graycomatrix. Maybe something like

kernel = [-1 -1 -1; -1 8 -1; -1 -1 -1];
differenceImage = conv2(inputImage, kernel);

Look them up, then refine your vague question and come back if you still can't figure out what to do.