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ID:36640780
大小:908.18 KB
页数:74页
时间:2019-05-13
《联合拥塞控制与H.264容错编码的视频传输研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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