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Filter (video)
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Filter (video) : ウィキペディア英語版
Filter (video)

A video filter is a software component that is used to decode audio and video.〔(【引用サイトリンク】title=Microsoft KnowledgeBase article KB923122 )〕 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
== Prefilters ==
Common ''prefilters'' include:
* denoising
* resizing (upsampling, downsampling)
* contrast enhancement
* deinterlacing (used to convert interlaced video to progressive video)
* deflicking

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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