Question

I am working on image processing. I want to add the difference of pixels of two images.

Suppose I have two images A, and B. I pick the first pixel of both images and store the difference value. I want to add this difference value to next pixel-difference. I try using this code, but it is not working. How can I do it?

A = imread('sub2.jpg');
B = imread('sub1.jpg');
tic
[rows cols] = size(A);
diff1 = 0;
for x = 1:rows
   for y = 1:cols
       diff = A(x,y)-B(x,y);
       diff1 = diff1+diff;
   end
end
disp(diff1);
toc

Answer 1

Looks okay though, but you’re better off with:

diff1 = sum(sum(A-B));

or if B is larger than A:

diff1 = sum(sum(A-B(1:size(A,1),1:size(A,2))));

This gives just one value (as your code does), I’m not sure if that really is what you want..