Correlation between two images ..

I am doing a project on steganography . I have been asked to calculate the correlation between stego image and real image . plz someone can help me with the code of correlation ,,, plz .

Answer 1

[Image Analyst]

Well I'm no stego expert but I thought usually they would use psnr or ssim to compare the concealing image and the original cover image, or the original message image and the recovered/retrieved hidden image. Both of those functions are built in to the Image Processing Toolbox.

Answer 2

[Youssef Khmou]

if you mean correlation coefficient, you can program manually the function or use corr2 :

     corr2(A,B); % returns a scalar