It has been for a long time since S/N ratio isn't always good at picture quality i evaluation. However, we still often evaluate picture quality by S/N ratio. Because, it is easy to calculate and it has a relation to picture quality. Furthermore good alternative isn't established yet. In this report, relationship between picture quality and Luminance Differential Information (LDI) is described. As a result, it turned out that distribution of LDI, which depends on the coding met,hod, correspond to the appearance of the distiortion. And it is useful for picture quality evaluation.
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