基于h.264svc的時域差錯掩蓋算法研究

1、南京郵電大學(xué)碩士學(xué)位論文基于H.264SVC的時域差錯掩蓋算法研究姓名：周飛申請學(xué)位級別：碩士專業(yè)：信號與信息處理指導(dǎo)教師：胡棟201103南京郵電大學(xué)碩士研究生論文AbstractⅡAbstractAstheScalableVideoCoding(SVC)extensionoftheH.264AVCstardH.264AVCSVCincpatesefficientlythefunctionalitiesofscalabilityoft

2、empal，spatialqualityaswellasthegoodencodingperfmance.Itsupptstransmittingdecodingpartialbitstreamstomeettheconstraintofdifferentapplicationstransptenvironment.Howeversuchacompressedvideoisverysensitivetodatalossinerrpron

3、echannels(e.g.IPwirelesscommunicationwks).Channelerrscannotonlydamagecurrentframebutalsopropagatetosubsequentframeswhichcansignificantlydegradetheimagequality.Errconcealment(EC)whichdoesn’timposeanyadditionalcomplexityon

4、videoencoderprovidesafeasiblesolutionferrhlingbyrecoveringthedamagedareasusingspatialtempalredundancyinfmationofimagesacteristicsofhumanvisualsystem.Therefeitisapromisingtechniqueintheypracticetodesignerrconcealmentmetho

5、dsbasedonH.264AVCSVC.InthisthesisfirstlywebrieflyoutlinethemaintechniquesinthederofcodingframewktempalspatialqualityscalabilityinH.264AVCSVCthendescribesomeerrconcealmenttechnologyappliedinH.264.Afterdetailedanalysisofth

6、eexistingSVCtempalconcealmentalgithmthisthesisproposesthefollowingimprovements:1accdingtotheacteristicsofSVCtemproalscalabilitythedecodererrconcealmenterrpropagationproposedtwowayTDconcealmentalgithmmakingthechoiceofrefe

7、renceframeismesuitedtolostframe2proposedanimprovedmotionvectestimationalgithm:expingthecidatevectofmissingonethenimprovethematchingalgithmtoestimatethebestcidatevect3accdingtotheerrconditionsofbaselayeradaptivetheBLSKIPi

8、mprovedTDalgithmftheerrconcealmentoflostenhancementlayer.Finallysimulationresultsverifytheimprovedalgithm.Theexperimentresultsshowthattherefinedalgithmcanaehieve0.41.1dBaveragePSNRgainsfreeoveredimagesecomparedwiththeigi