【正文】
111722(mpeg1) Video Codec for AudioVisual Services at px64 kbit/s 11172 – Coding of Moving Pictures and Associated Audio For Digital Storage Media at up to ISO/IEC JTC1標(biāo)準(zhǔn)與 ITUT標(biāo)準(zhǔn)的相互關(guān)系 (2) ? ITUT =ISO/IEC 138182(mpeg2) Generic Coding of Moving Pictures and Associated Audio. ? ITUT ~ISO/IEC 144962(mpeg4) Video Coding For Low Bitrate Communication. 144962 – Generic Coding of AudioVisual Objects. JVT Joint Video Team ? ITUT VCEG, the Video Coding Experts Group, develops voluntary standards for advanced moving image coding methods appropriate for conversational and nonconversational audio/visual applications. It is chartered as Question 6 of Study Group 16 of ITUT. ISO/IEC MPEG, the Moving Picture Experts Group, develops international standards for pression and coding, depression, processing, and coded representation of moving pictures, audio, and their bination, in order to satisfy a wide variety of applications. MPEG is chartered as Working Group 11 of Submittee 29 of JTC1. JVT will do ? The JVT project will take over the (Improved Video Coding for Multimedia Communication) project of the ITUT and create a single interoperable solution for a next generation of standard video coding. It will result in technically aligned Standards in MPEG. Formal approval of the new standards is expected to be plete by the end of 2023. NTSC National Television Systems Committee ? 美國(guó)國(guó)家電視制式委員會(huì) ? 第一屆 1940年成立 1941年解散(單色標(biāo)準(zhǔn)) ? 圖像特點(diǎn): ? 每幀 525條掃描線, 2:1隔行 ? 每秒 30幀 ? 寬高比為 4:3 ? 第二屆 1950年成立 1954年解散(彩色標(biāo)準(zhǔn)) ? 圖像特點(diǎn): ? 幀頻: ? 使用范圍:美國(guó)、加拿大、中美洲、大部南美、日本 PAL PhaseAlternative Line System ? 逐行倒相彩色電視制 ? 圖像特點(diǎn): ? 每幀 625行 ? 每秒 25幀 /(50)場(chǎng) ? 使用范圍 :(最早由德國(guó)研制 )英國(guó)、受英聯(lián)邦影響的國(guó)家和領(lǐng)地、許多中歐國(guó)家、中國(guó)。其主要職責(zé)是完成電聯(lián)有關(guān)電信標(biāo)準(zhǔn)方面的目標(biāo),即研究電信技術(shù)、操作和資費(fèi)等問(wèn)題,出版建議書,目的是在世界范圍內(nèi)實(shí)現(xiàn)電信標(biāo)準(zhǔn)化,包括在公共電信網(wǎng)上無(wú)線電系統(tǒng)互連和為實(shí)現(xiàn)互連所應(yīng)具備的性能。 這在 ITU歷史上具有重要意義,它標(biāo)志著 ITU新機(jī)構(gòu)的誕生。這是繼 1992年 12月 ITU全權(quán)代表大會(huì)之后的又一次重要大會(huì)。 ITU的原組織有全權(quán)代表會(huì)、行