低碼率下h.264avc的基本單元層碼率控制算法研究

1、西南交通大學碩士學位論文低碼率下H.264AVC的基本單元層碼率控制算法研究姓名：魏顯超申請學位級別：碩士專業(yè)：控制理論與控制工程指導教師：張翠芳20090601西南交通大學碩士研究生學位論文第1I頁AbstractTheultimategoalofratecongolistotransmithighqualityvideosequenceunderthelimitedbuffercapacityandchannelbandwidthI

2、nbothreal—timevideocommunicationstomeetrequirementsoflowtransmissiondelaybutalSOtOensuregoodvideoqualitySatecontrolplaysakeyroleinH264protoc01AfterdoingresearchonthestandardofH264ratecontrolalgorithmIdidthefollowreseach：

3、1TosolvetheissuesofthechickenandeggdilemmaofratecontrolmodelinJM86。thePaperimprovesthecalculationmethodofaveragepixelsinformationbit(AveragePixelInformationBit，APIB)，thenusetheimprovedaveragepixelsinformationbitandthecha

4、ngeofpeaksignalnoiseratio(PeakSignalNoiseRatioPSNRlofcurrentmacroblocktocalculatecomplexityofthemacroblockThePaDerusesthecomplexitytoallocatebitforeachmacroblockThesimulationresultsshowthattheimprovementofthearticlenoton

5、lYintheratecontrolalgorithmforimprovedaccuracybuttheaveragepeaksignalnoiseratioalSOimprovesby015dB2ScenechangeisboundtoexistintheactualsequenceofthevideoInordertoeffectivelydeterminethescenechange，thisarticleusingdiffere

6、ntsceneoftheDCTofabsolutetermscoe伍cientsofadjacentframeshasthelargedifferenceandwithinthesamesceneoftheDCTabsolutetermstoefficientsofadjacentframeschangesinthecharacteristiesofasmoothInthisPaperanalgorithmisproposedTheal

7、gorithmiseasytoaccuratelydetermineagiveildecisionthreshold，anddetectionaccuracyisbetter3Todealwithinthescenechangeframe，thefirst，thepaperimprovesthedistributionalgorithmofbuffer肋enscenechangeoccurs。itincreasesthedifferen

8、ceofadjacentframesofthetargetbufferinaccordancewithimagecomplexityseteachframebu毹rtopreventbufferoverfloworunderflowThentoimprovethealgorithmofallocatingbitforeachframeThatistoallocatebitforthescenechangeflame，accordingt

9、o‘thedistancefromtheswitchframeTheimprovedbitsadjustmentfactoriSusedtoamendthebitsthatallocatedtoeachflameSimulationresultsshowthattheimprovedalgorithmiSeffectiveKeyWords：ratecontrol；improvedaveragepixelsinformationbit；s