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1、西南交通大學碩士學位論文H.264視頻編碼標準碼率控制算法的優(yōu)化姓名：李慧然申請學位級別：碩士專業(yè)：計算機應用技術指導教師：彭強20080401AbstractH。264videocodingstandardisprovidedformallybyITU—U／ISO．TheframeworkofH．264issimilarwithallvideoencodingstandards。Andmanynewtechnologies，suchasspatialpredictionintraencoding，adaptiveblocksizemotioncompensation，4x4intege
2、rtransformation，multiplereferencepicturesandcontentadaptivebinaryarithmeticcoding(CABAC)，areusedinit．Thesignal／noiserationobviouslyraisedinsamebitrateinthisstandard．Soitobtainsmuchattentionfromacademicandindustrialfields．Andtherearedifficultiesofencodingbecauseofthenewtechnology．Forexample．rateco
3、ntrolofH．264becomesdifficultbecauseofthechickenandeggdilemmawhichbroughtbythequantizationparameterusedforratedistortionwhichdeterminesthebestcodingmodeandtheratecontr01．SothenewratecontrolalgorithmsaredesignedtOdealwiththisproblem．AndtherearedefaultsofnewalgorithmsforH．264ratecontrolfacedtothemov
4、ef．a(chǎn)stsequences，suchasaverageallocatingbitrateandinaccurateMADprediction．SothisdissertationproposesanimprovedratecontrolalgorithmforH．264basedonthedetectionofsciencechangeandmovement．ThecomputingofratecontrolmodelexploitedbyH．264iscomplex．Andtheimpreciseratecontrolisbroughtbyit．Thereforeanonzeroc
5、oefficientbasedonamapISproposedtodealwiththesedefaults．．Firstlyanimprovedratecontrolalgorithmisproposedbasedonthedetectionscenechangeandhighmotion．TheimprovedratecontrolalgorithmoptimizeslinearMADpredictionmodelinencodingprocesswhenthescenechangeorhighmotionpicturesaredetected．Andthen，thisoptimiz
6、edMADwillbeusedtocomputinganoptimizedquantization．AndbitrateallocatingISaccordingtothecomparabilityofframesinasamecomplication·Lastlv．a(chǎn)noI屹eroratecontrolbasedonamapisdiscussed．Therelationshipbetweennonzeroandbitrateisstudiedtooptimizeratetocontrolbitrate，combinedwithaquantizationandraterelationsh
7、ipmap．ThesimulationshowsthatthePSNRofimprovedratecontrolalgorithmbasemotiondetectionisobviouslyimprovedforthepictureswithhighmotionbycomparedtoJVT．G012．AndthePSNRofnonzeroratecontrolbasedonamapiSobviouslyincreasedwhent
