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1、H.263视频场景自适应编码的改进算法38320043()JournalofZhejiangUniversity(EngineeringScience)Vol.38No.3Mar.2004:2003-03-16.():www.journals.zju.edu.cn/eng:(1974-),,,,.E-mail:ninetiger2002@163.comH.263,(,310027):,,.,,,.,,.,,,.:H.263;;;:TN919.8:A:1008-973X(2004)03-0292-05Improvedsceneadaptiveencodi
2、ngalgorithmforH.263videostreamLIXiao-jiang,CHENKang-sheng(DepartmentofInformationScienceand??ectronic??n?ineerin?,??e?ian??ni?er?it?,?an???o?310027,??ina)??stract:H.263recommendationcan?rovideeffectivecom?ressionmethodunderverylow?itrates.Howeverthevisual?ualityofsomeencodedvide
3、osegmentsdeclineswhenthescenechangesinthevideo.Anewscheme?asedontwolayersfiltrationmechanismwas?ro?osed.Inthisscheme,animagesimilaritye?aminationo?eratorree?aminedtheresultofhistograme?aminationalgorithminordertogetridofthefa?ea?ru?tframe.Afterfiltrationo?eration,thetruea?ru?tfr
4、amewascodedasintra-frameandthenanewvideosegment?egan.Simulationresultsshowthatthe?ro?osedschemecaneffectivelyrestrainthevideodistortionduringscenechanges.Thea?ru?tframewill?efilteredoutmoree?actlyandthe?it-rateofencodedvideoislessthanthatofformerschemes.?e??ords:H.263recommendat
5、ion;sceneada?tiveencoding;twolayersfiltrationmechanism;imagesim-ilaritye?aminationo?eratorH.263(ITU)H.261(64??it/s).H.263.(2?-?CT);1/2(??CM),,?CT"".,,,,,?CT.,,,.,,DCT,,(VLC)[1].H.2631.1,I(),,,(ab????f?a?e,).,,,.(),.1H.263F?g.1T???ca?????c???e?fc?ded??de??e??e?ce??H.263?ec???e?da
6、????1,.,,(?ce?eada????e??de?e?c?d??g?c?e?e).,.,.I,.,,.,.,,..:1);2)();3).,.Y?[2];L??[3];Fe??a?d?[4]().Fe??a?d?(?+?)MSE?+?,?,?=(?-?+?,?,?-?-?,?,?)2+??2?+?,?,?-?2?,?,??.(1):?,?,(?,?).QCIF(176?144),16?16,??[1,11],??[1,9].?-?+?,?,?(?+?)(?,?),?-?+?,?,?=1N?M??N?=1?M?=1??+?,?,?.(2)?2?+?
7、,?,?(?+?)(?,?),?2?+?,?,?=1N?M??N?=1?M?=1(??+?,?,?-?-?+?,?,?)2.(3):MN().16?16,M=16,N=16.MSE?+?,?,?,MSE?+?,?,?,,,,()I.2,,.BP,,,BPI.,I,.,,,3923,:H.263.2F???????MSE.2,"N???",MSE90150."S?????"12."F??????"63,155,180,191,194."C????????"MSE.2,("N???","S?????","F??????"),,("C????????").2
8、F??.2E?????????????????????????????????????????
