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1、AdvancedVideoCommunication (2.VideoCodingStandards)RonggangWangPekingUniversity,ShenzhenGraduateSchool2010.10.10OutlineVideocodingstandardsoverviewH.261H.263H.264OthernewgenerationstandardsAVSVC-1ON2VP82Whyweneedstandard?–Ensuringinteroperability:Enablingcommunication
2、betweendevicesmadebydifferentmanufacturers–Promotingatechnologyorindustry–Reducingcosts3WhatdotheStandardsSpecify?Justthebitstreamsyntaxandthedecodingprocess(e.g.useIDCT,butnothowtoimplementtheIDCT)→Enablesimprovedencoding&decodingstrategiestobeemployedinastandard-com
3、patiblemanner4VideoCodingStandardizationOrganizationsTwoorganizationsdominatevideocompressionstandardization:ITU-TVideoCodingExpertsGroup(VCEG)InternationalTelecommunicationsUnion–TelecommunicationsStandardizationSector(ITU-T,aUnitedNationsOrganization,formerlyCCITT),
4、StudyGroup16,Question6ISO/IECMovingPictureExpertsGroup(MPEG)InternationalStandardizationOrganizationandInternationalElectrotechnicalCommission,JointTechnicalCommitteeNumber1,Subcommittee29,WorkingGroup115DynamicsoftheVideoStandardizationProcessVCEGisolderandmorefocuse
5、donconventional(esp.low-delay)videocodinggoals(e.g.goodcompressionandpacket-loss/errorresilience)MPEGislargerandtakesonmoreambitiousgoals(e.g.“objectorientedvideo”,“synthetic-naturalhybridcoding”,anddigitalcinema)Sometimesthemajororganizationsteamup(e.g.ISO,IECandITUt
6、eamedupforbothMPEG-2andJPEG)Relativelylittleindustryconsortiumactivity(DVandorganizationsthattweakthevideocodingstandardsinminorways,suchasDVD,3GPP,3GPP2,SMPTE,IETF,etc.)Growingactivityforinternetstreamingmediaoutsideofformalstandardization(e.g.,Microsoft,RealNetworks
7、,Quicktime)6Videocodingstandardshistory7H.261H.261:TheBasisofModernVideoCompressionITU-T(ex-CCITT)Rec.H.261:ThefirstwidespreadpracticalsuccessFirstdesign(late‘90)embodyingtypicalstructurethatdominatestoday:16x16macroblockmotioncompensation,8x8DCT,scalarquantization,an
8、dvariable-lengthcodingKeyaspectslaterdroppedbyotherstandards:loopfilter,integermotioncomp.,2-DVLC,headeroverheadv2(early‘93)
