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## Pre-processing

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Pre-processing is an important part of any professional compression encoder. It includes vital functions such as noise reduction, forward analysis, picture re-sizing and frame synchronisation. Very often, the pre-processing functions have direct connections with the main compression engine, which is why, in many cases, integrated pre-processing produces better results than external ones, even if external pieces of equipment might be more sophisticated. Pre-processing is as much a system function as it is an encoder function. It is closely related to most of the concepts discussed in remaining chapters of this book, and in many cases it would be beneficial to introduce the system aspects first before explaining how pre-processing functions can improve the end-to-end performance. Nevertheless, it was felt that since pre-processing is an integral part of encoders, it should be explained in conjunction with compression algorithms rather than towards the end of the book. There are many cross-references in this chapter, and the reader should not hesitate to read some of the other chapters before returning to this one.

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