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A video filter is a software component that is used to decode audio and video. Multiple filters can be used in a filter chain, in which each filter receives input from its previous-in-line filter upstream, processes the input and outputs the processed video to its next-in-line filter downstream. Such a configuration can be visualized in a filter graph.
With regards to video encoding three categories of filters can be distinguished:
- prefilters: used before encoding
- intrafilters: used while encoding (and are thus an integral part of a video codec)
- postfilters: used after decoding
Common prefilters include:
- resizing (upsampling, downsampling)
- contrast enhancement
- deinterlacing (used to convert interlaced video to progressive video)
Common intrafilters include:
Common postfilters include:
- "Microsoft KnowledgeBase article KB923122". Retrieved 2011-08-30.
- Bovik, Al (ed.). Handbook of Image and Video Processing. San Diego: Academic Press, 2000. ISBN 0-12-119790-5.
- Wang, Yao, Jörn Ostermann, and Ya-Qin Zhang. Video Processing and Communications. Signal Processing Series. Upper Saddle River, N.J.: Prentice Hall, 2002. ISBN 0-13-017547-1.
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