How to gain the PSNR and SSIM

[Lincoln20030413]

Can you tell me how to get the PSNR and SSIM? I don't find the code of this part.

[Lincoln20030413]

Because the images in output folder are not in the same order as those in input order, which is a great task for me to calculate the PSNR and SSIM.

[sefibk]

It is referenced in the paper.
As I recall we used a standard method that was standardized in super-resolution for computing PSNR.