Percentage of Accuracy for image Steganography

Hello, I am new user of Matlab. I am doing the project about image steganography. I want to get the percentage of accuracy betweeon two images which is original and stego image. May I get some help from you?

Answer 1

[Image Analyst]

How about if you just find out how many are equal?

For two gray scale images

theSame = nnz(grayImage1 == grayImage2)
pct = 100 * theSame / numel(grayImage1);

For a color image

theSame = all(rgbImage1 == rgbImage2, 3)
pct = 100 * nnz(theSame) / numel(grayImage1);

[Ei Sandar Tun]

SIr, rgbImage1 or grayImage1 mens original image and grayImage2 or rgbImage2 is about stego mage?