H.264视频编码标准码率控制算法的优化

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1、西南交通大学硕士学位论文H.264视频编码标准码率控制算法的优化姓名：李慧然申请学位级别：硕士专业：计算机应用技术指导教师：彭强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．astsequences，suchasaverageallocatingbitrateandinaccurateMADprediction．SothisdissertationproposesanimprovedratecontrolalgorithmforH．264basedonthedetectionofsciencechangeandmovement．ThecomputingofratecontrolmodelexploitedbyH．264iscomplex．Andtheimpreciseratecontrolisbroughtbyit．Thereforeanonzeroc

5、oefficientbasedonamapISproposedtodealwiththesedefaults．．Firstlyanimprovedratecontrolalgorithmisproposedbasedonthedetectionscenechangeandhighmotion．TheimprovedratecontrolalgorithmoptimizeslinearMADpredictionmodelinencodingprocesswhenthescenechangeorhighmotionpicturesaredetected．Andthen，thisoptimiz

6、edMADwillbeusedtocomputinganoptimizedquantization．AndbitrateallocatingISaccordingtothecomparabilityofframesinasamecomplication·Lastlv．anoI屹eroratecontrolbasedonamapisdiscussed．Therelationshipbetweennonzeroandbitrateisstudiedtooptimizeratetocontrolbitrate，combinedwithaquantizationandraterelationsh

7、ipmap．ThesimulationshowsthatthePSNRofimprovedratecontrolalgorithmbasemotiondetectionisobviouslyimprovedforthepictureswithhighmotionbycomparedtoJVT．G012．AndthePSNRofnonzeroratecontrolbasedonamapiSobviouslyincreasedwhent