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全参考图像质量评价Theabove(ssim_index.m)isasinglescaleversionoftheSSIMindexingmeasure,whichismosteffectiveifusedattheappropriatescale.Theprecisely“right”scaled

The structural similarity image quality paradigm is based on the assumption that the human visual system is highly adapted for extracting structural i

均方误差（mean-square error, MSE）是反映估计量与被估计量之间差异程度的一种度量。设t是根据子样确定的总体参数θ的一个估计量，(θ-t)2的数学期望，称为估计量t的均方误差。它等于σ2+b2，其中σ2与b分别是t的方差与偏倚。 psnr是“Peak Signal to Noise