Filter (video)
Software component for decoding video or audio From Wikipedia, the free encyclopedia
A video filter is a software component that performs some operation on a multimedia stream.[1] Multiple filters can be used in a chain, known as a filter graph, in which each filter receives input from its upstream filter, processes the input and outputs the processed video to its downstream filter.
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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
Intrafilters
Common intrafilters include:
Postfilters
Common postfilters include:
- deinterlacing
- deblocking
- deringing
See also
Notes
References
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