In Section 4.3.4, we discussed weighted MSE (WMSE) based on the human visual system Contrast Sensitivity Function (CSF). We argued that in many cases, this WMSE is a more accurate gauge of perceptual quality than the more usual MSE. In Section 5.2, we discussed the traditional method for minimizing WMSE via rate allocation. The discussion there was based primarily on the assumption of non-scalable compression, where only “single quality” decoding is possible.
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