TAILIEUCHUNG - Nén Video thông tin liên lạc P1

Both the International Standardisation Organisation (ISO) and the International Telecommunications Union (ITU) standardisation bodies have been releasing recommendations for universal image and video coding algorithms since 1985. The first image coding standard, namely JPEG (Joint Picture Experts Group), was released by ISO in 1989 and later by ITU-T as a recommendation for still image compression. In December 1991, ISO released the first draft of a video coding standard, namely MPEG-1, for audiovisual storage on CD-ROM at —2 Mbit/s | Compressed Video Communications Abdul Sadka Copyright 2002 John Wiley Sons Ltd ISBNs 0-470-84312-8 Hardback 0-470-84671-2 Electronic 1 Introduction Background Both the International Standardisation Organisation ISO and the International Telecommunications Union ITU standardisation bodies have been releasing recommendations for universal image and video coding algorithms since 1985. The first image coding standard namely JPEG Joint Picture Experts Group was released by ISO in 1989 and later by ITU-T as a recommendation for still image compression. In December 1991 ISO released the first draft of a video coding standard namely MPEG-1 for audiovisual storage on CD-ROM at Mbit s. In 1990 CCITT issued its first video coding standard which was then in 1993 subsumed into an ITU-T published recommendation namely ITU-T for low bit rate communications over ISDN networks at p x 64 kbit s. ITU-T alternatively known as MPEG-2 was then released in 1994 as a standard coding algorithm for HDTV applications at 4- 9 Mbit s. Then in 1996 standardisation activities resulted in releasing the first version of a new video coding standard namely ITU-T for very low bit rate communications over PSTN networks at less than 64 kbit s. Further work on improving the standard has ended up with a number of annexes that have produced more recent and comprehensive versions of the standard namely and in 1998 and 1999 respectively. In 1998 the ISO MPEG Motion Picture Experts Group AVT Audio Video Transport group put forward a new coding standard namely MPEG-4 for mobile audiovisual communications. MPEG-4 was the first coding algorithm that used the object-based strategy in its layering structure as opposed to the block-based frame structure in its predecessors. In March 2000 the standardisation sector of ISO published the most recent version of a standard recommendation namely JPEG-2000 for still picture compression. Most of the aforementioned video coding .

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