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High Efficiency Video Coding
High Efficiency Video Coding (HEVC) is a video compression standard, a successor to H.264/MPEG-4 AVC (Advanced Video Coding), which was jointly developed by the ISO/IEC JTC 1/SC 29/WG 11 Moving Picture Experts Group (MPEG) and ITU-T SG16/Q.6 Video Coding Experts Group (VCEG) as ISO/IEC 23008-2 MPEG-H Part 2 and ITU-T H.265. MPEG and VCEG established a Joint Collaborative Team on Video Coding (JCT-VC) to develop the HEVC standard.〔〔 Version 1 of HEVC was finalized on January 25, 2013 and the specification was formally ratified as a standard on April 13, 2013.
HEVC is said to double the data compression ratio compared to H.264/MPEG-4 AVC at the same level of video quality. It can alternatively be used to provide substantially improved video quality at the same bit rate. It can support 8K UHD and resolutions up to 8192×4320.〔〔
The first version of the standard was completed, approved, and published in 2013. The second version was completed and approved in 2014 and published in early 2015, and includes format range extensions (RExt) (supporting higher bit depths and the monochrome, 4:2:2, and 4:4:4 chroma sampling formats), scalable coding extensions (SHVC), and multi-view extensions (MV-HEVC). Additional 3D-HEVC extensions for 3D video were completed in early 2015. Further screen content coding (SCC) extensions remain in development for completion in early 2016 for video containing rendered graphics, text, or animation as well as (or instead of) camera-captured video scenes.
HEVC is protected by patents owned by various parties. Commercial use of HEVC technologies requires the payment of royalties to a licensor of HEVC patents, such as MPEG LA or HEVC Advance.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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