Filter (video)

A video filter is a software component that performs some operation on a multimedia stream. 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. __TOC__

With regard 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: deblocking

Postfilters Common postfilters include: deinterlacing deblocking deringing

See also Filter graph

Notes

References Bovik, Al (ed.). Handbook of Image and Video Processing. San Diego: Academic Press, 2000. . Wang, Yao, Jörn Ostermann, and Ya-Qin Zhang. Video Processing and Communications. Signal Processing Series. Upper Saddle River, N.J.: Prentice Hall, 2002. .