How to further divide a sliding window

Hi I have written the following code which divides applies a 32x32 sliding window to an image.

    N = 32;
    info = repmat(struct, ceil(size(Z, 1) / N), ceil(size(Z, 2) / N)); 
    for row = 1:N:size(Z, 1)%loop through each pixel in the image matrix
     for col = 1:N:size(Z, 2)
         r = (row - 1) / N + 1;
         c = (col - 1) / N + 1;

         imgWindow = Z(row:min(end,row+N-1), col:min(end,col+N-1));
         largest = max(imgWindow(:));
         [rLarg, cLarg] = find(imgWindow == largest, 1, 'first');

         average = mean(imgWindow(:));

         window(r, c).average = average;
         display(window(r, c).average);

     end
 end

Can anyone tell me how to further divide the 32x32 windows into 8x8 windows?

Thank you.