![]() ![]() Rules and checks for software conformance (to Part 1). ISO/IEC 10918 consists of the following parts:ĭigital compression and coding of continuous-tone still images – Parts Part JPEG standards are formally named as Information technology – Digital compression and coding of continuous-tone still images. The Exif and JFIF standards define the commonly used file formats for interchange of JPEG-compressed images. The JPEG standard specifies the codec, which defines how an image is compressed into a stream of bytes and decompressed back into an image, but not the file format used to contain that stream. The original JPEG Group was organized in 1986, issuing the first JPEG standard in 1992, which was approved in September 1992 as ITU-T Recommendation T.81 and, in 1994, as ISO/ IEC 10918-1. On the ITU-T side, ITU-T SG16 is the respective body. Currently on the JTC1 side, JPEG is one of two sub-groups of ISO/ IEC Joint Technical Committee 1, Subcommittee 29, Working Group 1 ( ISO/IEC JTC 1/SC 29/WG 1) – titled as Coding of still pictures. In 1987, ISO TC 97 became ISO/IEC JTC 1 and, in 1992, CCITT became ITU-T. The group published the JPEG standard in 1992. Founded in 1986, the group developed the JPEG standard during the late 1980s. The "Joint" stood for ISO TC97 WG8 and CCITT SGVIII. "JPEG" stands for Joint Photographic Experts Group, the name of the committee that created the JPEG standard and also other still picture coding standards. However, the JPEG specification did cite two earlier research papers by Wen-Hsiung Chen, published in 19. The patent describes a DCT-based image compression algorithm, and would later be a cause of controversy in 2002 (see Patent controversy below). Patent 4,698,672, filed by Compression Labs' Wen-Hsiung Chen and Daniel J. Other companies cited as patent holders include AT&T (two patents) and Canon Inc. The JPEG specification also cites three other patents from IBM.
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