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????Subjective quality assessment can be applied by visual perception or mean opinion score (MOS)?? which has been used in ITU-T p.910?? a standard in multimedia services. Visual perception is predicated on the observers’ perception without a numerical quantification. MOS is defined as the average of the quality values ranging from1 to 5that are obtained from observers.
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???????????????????У?1:????????PSNR(Peak Signal to Noise Ratio)??2??????????SSIM??structural similarity?? ??3:???????MSE(mean square error)??4: RMSE(root mean square error)??5: corss-correlation ;
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????PSNR:
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????SSIM:
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?????????????????????????????????????λ??????????????????????????棩??????????Ч????????????????????????????С?????????????????????????????С?????????????[8]??????complex wavelet SSIM??CW-SSIM????
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????MSE | PSNR | SNR | MAE ?? ????????
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