Note: summary of the papers and some text as well as images taken directly from the respective papers because of the clarity in the explanation. Metrics for perfomance measure Peak Signal to Noise Ratio (PSNR) It measure ratio between maximum possible power of a signal and the power of corrupting noise that affets the signal quality. PSNR commonly used to quantify the quality of image and video reconstruction. Measures in dB (decibel) scale.