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## Picture quality assessment

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Many chapters of this book make references to picture quality. Therefore, it is appropriate to give a brief overview of picture quality measurement methods. For example, statistical multiplexing systems, described in Chapter 12, have to have a measure of picture quality in order to allocate appropriate bit rates to each of the encoders. Although it will be shown in Chapter 4 that the quantisation parameter (QP) is one of the main factors affecting picture quality, there are many other factors influencing the quality of compressed video signals. This chapter gives a brief summary of picture quality assessment methods.

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