Video processing: Difference between revisions

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In [[electronics engineering]], '''video processing''' is a particular case of [[signal processing]], in particular [[image processing]], which often employs [[filter (video)|video filters]] and where the input and output [[Signal (electrical engineering)|signal]]s are [[video file format|video file]]s or [[video stream]]s. Video processing techniques are used in [[television set]]s, [[VCR]]s, [[DVD]]s, [[video codecs]], [[video player (software)|video player]]s, [[video scaler]]s and other devices. For example—commonly only [[design]] and video processing is different in TV sets of different manufactures.{{Citation needed|date=October 2008}}

==Video processor==

Video processors are often combined with [[video scaler]]s to create a video processor that [[Improved-definition television|improves the apparent definition]] of video signals. They perform the following tasks:

* [[deinterlacing]]

* [[aspect ratio (image)|aspect ratio]] control

* [[digital zoom]] and [[panning (camera)|pan]]

* [[brightness]]/[[contrast (vision)|contrast]]/[[hue]]/[[saturation (color theory)|saturation]]/[[sharpness (visual)|sharpness]]/[[gamma correction|gamma]] adjustments

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* [[compression artifact|block noise]] reduction

* detail enhancement

* [[edge enhancement]]

* [[motion compensation]]

* primary and secondary color calibration (including hue/saturation/luminance controls independently for each)

These can either be in chip form, or as a stand -alone unit to be placed between a source device (like a DVD player or set-top-box) and a display with less-capable processing. The most widely recognized video processor companies in the market are:

* Genesis Microchip (with the FLI chipset – was Genesis Microchip, STMicroelectronics completes acquisition of Genesis Microchip on January 25, 2008)

* Sigma Designs (with the VXP chipset – was Gennum, Sigma Designs purchased the Image Processing group from Gennum on February 8, 2008, Sigma Designs is now part of Silicon Labs)

* Integrated Device Technology (with the HQV chipset and Teranex system products – was Silicon Optix, IDT purchased SO on October 21, 2008, IDT is now part of Renesas)

* [[Silicon Image]] (with the VRS chipset and DVDO system products - was Anchor Bay Technologies, Silicon Image purchased ABT on February 10, 2011)

All of these companies' chips are in devices ranging from DVD upconverting players (for Standard Definition) to [[HD DVD]]/[[Blu-ray Disc]] players and set-top boxes, to displays like plasmas, [[Digital Light Processing|DLP]] (both front and rear projection), [[Liquid crystal display|LCD]] (both [[Liquid crystal display television|flat-panels]] and [[LCD projector|projectors]]), and [[LCOS]]/"[[SXRD]]". Their chips are also becoming more available in stand alone devices (see "External links" below for links to a few of these).

== See also ==

{{Portal|Television}}

* [[Video scaler]]

* [[Processing amplifier]]

* [[Scan conversion]]

* [[Display resolution]]

==References==

* Bovik, Al (ed.). ''Handbook of Image and Video Processing''. San Diego: Academic Press, 2000. {{ISBN |0-12-119790-5}}.

* [[Yao Wang|Wang, Yao]], Jörn Ostermann, and Ya-Qin Zhang. ''Video Processing and Communications''. [http://www.siliconmentor.blogspot.in/2014/09/signal-processing-as-name-suggests.html Signal Processing] Series. Upper Saddle River, N.J.: Prentice Hall, 2002. {{ISBN |0-13-017547-1}}.

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[[Category{{DEFAULTSORT:Video processing|*]]Processing}}

[[Category:Video signalprocessing|* ]]

[[Category:TelevisionVideo terminology|*signal]]

[[Category:Television terminology]]

[[Category:Multidimensional signal processing]]