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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
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