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## Motion estimation

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Motion estimation is arguably one the most important sub-functions of any motion compensated video compression algorithm - a reason enough to allocate a whole chapter to it. Although there are differences in terms of prediction modes and block sizes, the removal of temporal redundancy in video signals inevitably requires a search engine that provides motion information on predicted blocks or block par titions. However, motion estimation techniques are not only a major part of video compression algorithms, they are also used in noise reduction, de-interlacing (see also Chapter 8), standards conversion and many other video-processing applications. It is, therefore, not surprising that a large number of motion estimation algorithms have been developed for video compression as well as for other application areas.

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