This code not correct result the what is problem ?

 MSE1=mean(mean((embeddedImage-originalImage).^4));
 MaxI=1;% the maximum possible pixel value of the images.
 PSNR=15*log10((MaxI^2)/MSE1);
disp(PSNR);

[the cyclist]

Please read this, and then edit your question to have a better chance at getting a useful answer: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Image Analyst]

Chances are your images are uint8 and the subtraction is clipping them. Cast to double before subtracting. And I'm not sure why you're raising them to the 4th power instead of squaring them to find the Mean Square Error. Finally, you can use mean2() instead of mean(mean)).

Better yet, just use the built-in psnr() function in the Image Processing Toolbox. Or, you can use my attached function if you have an antique version of MATLAB.