基于AVSM标准的参考帧选择算法研究

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1、西南交通大学硕士学位论文基于AVS-M标准的参考帧选择算法研究姓名：代志刚申请学位级别：硕士专业：交通信息工程及控制指导教师：彭强20080501西南交通大学硕士研究生学位论文第1I页AbstractBlock．basedhybridcodingtechniqueisusedtocompressvideodatainAVSvideocodingstandardandallothervideocodingstandards．ThelOWbit—ratevideostreamcompressedbymotioncompensatedhybridcodecsisex

2、tremelyvulnerableagainsttransmissionerrors．Real．timevideostreamtransmissioninInternetorwirelessenvironmentsisachallengingtaskrequiringhigh—compressionefficiencyaswellasrobusterrorcontr01．Onceanerroroccurredintransmission，notonlytheeffectsoffaultinformationwouldbepropagatedinspatiala

3、ndtemporalrapidlywhichmayresultinverypoorobjectionablevisualqualityseverely,butalsothevideocommunicationsystemcouldbeinfailure．Justbandwidthlimitationandquantitativedistortionaleconsideredintraditionalrate—distortionoptimalalgorithmwhichisnotsuitableforpacketlossyenvironment．Henceho

4、wtoimprovethevideoqualitywiththelimitedavailablebitratehasbecomeaserioustask．Thisthesisfirstreviewstheprincipleofrate-distortionoptimalforvideocoding．Inparticular,theend—·to·-enderrorpropagationdistortiononpixellevelprecisionisstudiedbasedontheanalysisofthepropagationdistortionandco

5、ncealmentdistortioninAVS．Mvideoencodingandtransmission．Subsequently,thisthesisadoptsageneraltransmissiondistortionestimationmodel．TheaccuracyofthisestimationiSdemonstratedviasimulationresultsforvideotransmissionoverpacketlOSSchannel。whichillustratesthatactualdistortionCallbeestimate

6、dbyusedexpectationmodelapproximately．Thismodelprovidesanefficientmethodforcodingparametersoptimalselectionovererrorproneenvironment．Thereferencepictureselectionmethodswithnon．feedbackforerrorresilientcodingareresearchedinthisthesis．Anon．feedbackkeyreferencepictureselectionalgorithmi

7、Srealized．Combinedwithgeneraltransmissiondistortionestimationmodelandrate—distortionoptimalstrategy,thekeyreferencepictureselectionalgorithmcandeterminewhichreferencepictureshouldbeselectedthroughcomparingthedistortionexpectationofpreviouskeypictureandpreviouspicture．Thismethodcanli

8、miterrorpropagation