Image blind separation I am working in image cryptography using an ICA algorithm like JADE. To evaluate my work, I am used the SDR and PSNR. 

I would like to know what the acceptable values of the SDR and PSNR in image blind separation are.
The best way to compare your method to others is to run the algorithms on a common data set. Quntative measures such as PSNR vary significantly across images. 

It is also important to consider subjective analysis. After all, your research is aiming for improvements in appearance.