h.264码率控制算法的-研究

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1、太原理工大学硕士研究生学位论文RESEARCH0FH．264RATECON田ROLALGORIT]印ⅥABSTRACTH．264isanewvideocodingstandardanditspurposeistoprovidehighvideoqualityvideointheconditionoflowbitratetransmission．Inordertoachievethepurpose，toomuchnewcodingtechniquesareappliedtoH．264．RDOisoneofthetechnique，itcanmak

2、evideoredundancylow．Althoughvideoperformancehasagreatimprovement，inordertomaintainastablevideoqualityduringtransmission，ratecontrolmusttobeconsiderate．InthestandardofH．264，themeanabsolutedifferenceoftheMBcanbeobtainedafterratedistortionoptimization．Asaresult，traditionalratec

3、ontrolalgorithmisnotsuitablefortheH．264codingstandard．Inordertosolvetheaboveproblems，JVT-G012proposedamethodofusingalinearpredictionalgorithmtopredicttheMB’SMADvaluesofthebasicunitlayer．Inthepurposeofratecontrol，QPvaluecallbecalculatedthroughMAD．But，therearestillsomeproblems

4、inthisalgorithm，whichincludesinaccurateMADvalueprediction．CoefficientoftheMADpredictionschemecanbe-updatedbylinearregression，whichcanbringlargeamountofcomputationcomplexity．Atthesametime，thealgorithmonlyconsidersthetemporalcorrelation，whichleadstotheinaccurateprediction．Awei

5、ghtedspatialandtemporalMADpredictionmodelisproposedtoIll太原理工大学硕士研究生学位论文solvetheaboveproblem，Themodeltakesintoaccountnotonlythetemporalcorrelation，butalsoconsidersthespatialcorrelation．Inthenewtemporalcorrelationprediction，weusetwoMBstocalculatethetemporalcorrelationMADvalue．

6、Wealsofmdthatsomevideosequenceshaveweaktemporalcorrelationbutstrongspatialcorrelation．Fourdirectionalspatialpredictionisproposed，includingvertical，horizontal，upper—left，upper-rightandwegivethemethodtochoosethesuitabledirectionalscheme．AfterwegetthetemporalMADvalueandspatialM

7、ADvalue，wecancalculatethenewweightedMADvalueoftheMBbythefeatureofthevideosequence．TheproposedweightedMADpredictionschemeistestedontheplatformofJM．Inordertomakemoreaccurateexperimentaldata，weselectsomesequencesofdifferentfeatures，notonlyincludingsomesimplesequencesandcomplexs

8、equences，butalsosomesequenceswithsceneswitching．Thefinalexperimentalresults