code to calculate psnr and ber of an image

to compute the performance analysis of denoising an image ,i need to calculate the psnr of the denoised image and then have to compare it with the psnr valuse of the real image,and then check the degree of correctness the method to denoise an image

Answer 1

[Wayne King]

measerr() in the Wavelet Toolbox computes PSNR and a few other approximation quality measures.