MPEG_video_coding

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1、MPEGvideocodingAsimpleintroductionDr.S.R.Ely(BBC)ThecoreelementofallDVBsystemsistheMPEG-2vision1.Introductioncodingstandard,whichisbasedTheMovingPicturesExpertGroup(MPEG)uponaflexibletoolkitoftechniquesstartedin1988asWorkingGroup11,Sub-forbit-ratereduction.committee29,ofISO/IECJTC11withthea

2、imofTheMPEG-2specificationonlydefiningthestandardsfordigitalcompressionofdefinesthebit-streamsyntaxandvideoandaudiosignals.IttookasitsbasistheITU-T2standardforvideo-conferencinganddecodingprocess.Thecodingvideo-telephony[1],togetherwiththatoftheJointprocessisnotspecified,whichPhotographicEx

3、pertsGroup(JPEG)whichhadmeansthatcompatibleimprove-initiallybeendevelopedforcompressingstillmentsinthepicturequalitywillimagessuchaselectronicphotography[2].continuetobepossible.ThefirstgoalofMPEGwastodefineavideoInthisarticle,theauthorprovidesacodingalgorithmfordigitalstoragemedia,insimple

4、introductiontothetechni-particularCD-ROM.TheresultingstandardwascalitiesoftheMPEG-2videocodingpublishedin1993asISO/IEC11172[3]andcom-standard.prisesthreeparts,coveringthesystemsaspects(multiplexingandsynchronization),videocodingandaudiocoding.ThisstandardhasbeenappliedIn1990,MPEGbeganworkon

5、asecondstandardintheCD-isystemtoprovidefullmotionvideowhichwouldbecapableofcodinginterlacedplaybackfromCD,andiswidelyusedinPCpicturesdirectly,originallytosupporthigh-qualityapplicationsforwhicharangeofhardwareandapplicationsatbit-ratesintherangeofabout5tosoftwarecodersanddecodersareavailabl

6、e.10Mbit/s.MPEG-2nowalsosupportshigh-definitionformatsatbit-ratesintherangeofaboutMPEG-1isrestrictedtonon-interlacedvideofor-15to30Mbit/s.TheMPEG-2standardwasfirstmatsandisprimarilyintendedtosupportvideopublishedin1994asISO/IEC13818,againcom-codingatbit-ratesuptoabout1.5Mbit/s.prisingthreep

7、arts±systems,videoandaudio.Asecondversionofthestandardwaspublishedin1.JointTechnicalCommitteeNo.1oftheInternational1995[4].OrganisationforStandardisationandtheInternationalElectrotechnicalCommission.ItisimportanttonotethattheMPEGstandards2.InternationalT