* Mean Square Error in Two Video Sequences of N Frames
* Peak Signal to Noise Ratio for One Video Sequence of N Frames (dB)
= 10 * log_10 (maximal intensity ^2 / MSE) where maximal intensity is 255 or 235 for luminance component.
- Calculate the MSE of this sequence instead of one frame first, then convert MSE to obtain the PSNR of this sequence.
> 40dB - excellent
30~40dB - good
20~30dB - poor
< 20dB - unacceptable
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