Filter (video)

Software component for decoding video or audio 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. 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 ^ "Introduction to DirectShow Application Programming". Retrieved September 14, 2017. References 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 Communicat