matlab code for quality index (q), in image steganography?

how to write matlab code for quality index (q), in image steganography. let p and q are my original and stego image of size 16 * 16. Any one please tell me how can i code the formula in matlab. i have attached the formulas

Answer 1

[Walter Roberson]

The first four of those formula are just mean() and std().

I already posted links to implementations of Quality Index when you asked about it recently.