联合拥塞控制与H.264容错编码的视频传输研究

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1、上海交通大学硕士学位论文联合拥塞控制与H.264容错编码的视频传输研究姓名：马佳申请学位级别：硕士专业：通信与信息系统指导教师：支琤20070101ABSTRACTRESEARCHONANINTEGRATEDCONGESTIONCONTROLANDH.264ERRORRESILIENCEFRAMEWORKFORVIDEOTRANSMISSIONABSTRACTWhentransmittingovertheerror-pronechannels,thecompressedvideobit-steamsa

2、realwaysvulnerabletoallkindsoftransmissionerrors.Thecorruptedpartsofthebit-streamsmaynotonlyaffectthereconstructioneffectofthecurrentframes,butalsocausetheerrorpropagationproblemsbothspatiallyandtemporally.Soitisreallypracticaltotakeintoaccounttheerror-

3、resilienceeffectsineachstepofthetransmissionsystem.Therefore,wedescribeaframeworkforvideotransmissionoverthepacket-losschannelinordertoobtainthebalancebetweensystemcostsandbenefits,whichfeaturesthecoordinatedoperationoftheH.264errorresilienceencoding,er

4、rorconcealmentalgorithms,transport-layerpacketizationandcongestioncontrolmechanisms.Intheencodingstep,weapplyanunequalerrorprotectionstrategybasedontheFMOandFECalgorithms,whichtriestoimprovethereconstructioneffectbyprotectinghalfofthemacro-blocksinafram

5、ehavingachess-boarddistributedmap.Asitimplieshigherprobabilitiesofcorrectdecodingoftheneighboringmacro-blocksaroundthemissingone,appropriateerrorconcealmentalgorithmsmayimprovetheirconcealmentresults.Thus,wefurtheremployanMAPestimatorintheerrorconcealme

6、ntsteptoenhancethefinallyvideoreconstructionquality.Thenewalgorithmenablestheestimationproceduretoincorporatemoreinformationinawiderrangeandisprovedtoachievequitegoodperformancesviaexperimentalresults.Besides,weintroduceanimprovedcongestioncontrolalgori

7、thmintooursystemwhichrepresentsasmootherbehaviorinbothtemporalcongestionand第II页ABSTRACTstableenvironments.Itcanadjustthesendingratebyanalyzingthefeedbackinformationaboutthenetworktoavoidsuccessivepacketlossduetotemporalorburstcongestionandthereforeincre

8、asethedecodableframenumberinthereceiverandprovideamorecontinuousservice.Keywords:End-to-Endvideotransmission,errorresiliencetools,congestioncontrol第III页附件四上海交通大学学位论文原创性声明本人郑重声明：所呈交的学位论文，是本人在导师的指导下，独立进行研究工作所取得的成果。除文中已经注明引用的内容外，本论文