three types of correlation coefficients for an image

i want to find the correlation cofficients for adjacent pixels in an image. i write this code and it give 2x2 matrix, now i don't know how to get horizantal, vertical and diagonal values for any image?

    a=image;
    a1=a(:,1:end-1);
    a2=a(:,2:end);
    cor=corrcoef(double(a1(:)),double(a2(:)));

Answer 1

[Thorsten]

 I = im2double(imread('cameraman.tif'));
 c_diag = corrcoef(I(1:end-1, 1:end-1), I(2:end, 2:end))
 c_vert = corrcoef(I(1:end-1, :), I(2:end, :))
 c_horz = corrcoef(I(:, 1:end-1, :), I(:, 2:end))

[faiz]

thanks a lot sir

[omar A.alghafoor]

How are you draw this options ? for solution above

c_diag,c_vert and c_horz

Answer 2

[Ranjit Shrestha]

what if we have more than two images? I mean a sequence of images.