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1、上海交通大学硕士学位论文关键词：HEVC、码率控制、R-l模型，gppII万方数据上海交通大学硕士学位论文RATECONTROLALGORITHMFORHIGHEFFICIENCYVIDEOCODING（HEVC）ABSTRACTWiththerapiddevelopmentof3GtechnologyandInternettechnology,theHEVC(HighEfficiencyVideoCoding)studiedbytheJCT-VCisreplacingtheH.264/AVCduetoitshighcodingefficiencyandsuitforhighdefi
2、nitionvideos,beingthenewgenerationofvideocodingstandard.Inpracticalapplication,howtoguaranteethequalityofcodingunderthelimitedbandwidthisaveryimportantproblembecausethebandwidthresourceislimitedandscarce,thisiswhatratecontroltechnologystudies.Fordifferentapplications,therequirementforratecontro
3、lisdifferent.Inentertainment,thehigh-definitionandqualityismoreimportant,andinreal-timesystemlikevideoconference,thelowdelayisrequired.Therapiddevelopmentofreal-timevideoapplicationmakesthelowdelayratecontrolahotpointinresearch.Inthispaper,weimprovetheexistedalgorithminHEVC,andmakeitsuitablefor
4、theapplicationwithlowdelay.ThispaperanalyzesthetechnologyinHEVCandthetheoryofratecontrolandmakesasummary.BecauseoftheweaknessinlowdelayapplicationoftheratecontrolalgorithmproposedinJCTVC-K0103,whichisappliedbyHEVCstandardtestmodel(HM),thispapermakessomeimprovementsforthebitallocationscheme.Infr
5、amelevel,abitallocationschemebasedonthebufferstatusisproposed.Inthecodedtreeunit(CTU)level,basedontheR-l(Rate-lambda)model,thebitforeachCTUnotencodedisallocatedaccordingtoanewweightandthebufferstatustogether.Theexperimentalresultsshowthatthebitallocationafterconsideringthebufferstatusmakesthera
6、tecontrolmoreaccurate,andsolvetheproblemofbufferoverflowandunderflow,whichachievesthegoaloflowdelay.AttheIII万方数据上海交通大学硕士学位论文sametime,theR-lmodelisnotaccurateforIntraframeratecontrol,whichmakestheperformanceworsewhenscene-cuthappens,sointhispaper,aframe(CTU)complexitybasedgradientisproposed,andu
7、sethegpp(gradientperpixel)optimizetheR-lmodelforIntraframeratecontrol.AndlotsofexperimentsshowthatthebitallocationforIntraframeismoreaccurateaftertheimprovedR-lmodelisappliedinIntraframeratecontrol,whilekeepingasmoothframebitandas
