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1、太原理工大學(xué)碩士研究生學(xué)位論文RESEARCH0FH．264RATECON田ROLALGORIT]?、鯝BSTRACTH．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太原理工大學(xué)碩士研究生學(xué)位論文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
