The following figure demonstrates how totally different discrepancies between test signals and the original one give same PSNR, it’s obvious that the test signal 1 seems much better approximation to the original signal than the test signal 2:
Taken from “OBJECTIVE VIDEO QUALITY ASSESSMENT”, by Zhou Wang et al.
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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