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1、上海交通大学硕士学位论文远程多媒体教学系统的实现及其关键技术研究姓名：陈惠东申请学位级别：硕士专业：信号与信息处理指导教师：杨树堂20070101上海交通大学硕士学位论文最为重要的视频对象提取、码率控制、容错能力与同步控制的实现和优化做了详尽的研究、比较以及改进；接着研究了实时传输技术，阐述了对实时传输协议RTP/RTCP与MMS的理解以及它们在远程多媒体教学系统中的实现方法；最后，以点播课程和直播课程为主，介绍了远程多媒体教学系统的集成方法和配套功能的实现，包括点播课程与直播课程的集成方案以及在线考试、实时答疑与
2、留言答疑的实现方法。本课题的研究受到了国家“863”项目支持，并通过“863”专家组验收。关键词：远程多媒体教学，MPEG-4编解码器，环节设计，对象提取，码率控制，传输协议II上海交通大学硕士学位论文IMPLEMENTATION&RESEARCHONKEYTECHNOLOGIESOFDISTANTMULTIMEDIATEACHINGSYSTEMABSTRACTTheapplicationofmultimediatechnologyandnetworktechnologyineducationfieldisoneo
3、fthehotspotnowadays.Currently,mostofthecountries,especiallythewesterndevelopedcountries,allattachgreatimportancetothedevelopmentofdistanteducation;InChina,R&Dondistanteducationisoperatedmorelatelythantheabovecountries,butmorerapidly.Asdistanteducation,especial
4、lydistantmultimediaeducation,involvesstreamingvideotransimissiononthenetwork,andthenetworkconditionrightnowisstillnotidealforthistransimission,thushowtoresolvetheseproblemsbecomestheworkofthepaper.Basedonthecomprehencerequirementofthedistantmultimediateachings
5、ystem,wechoosethedistantteachingmodebasedonwebbrowser.Thatistosay,Internetisusedastransmittingmediatobroadcastthemultimediateachingcontent,operateteachingactivity,manageteachingactivity,operateonlineexaminationandinstantQ&A,thusarealintegraleffectiveeducationm
6、odewillbecometrueonthenetwork..III上海交通大学硕士学位论文However,oneofthedifficultiesishowtobroadcasttheteachingA/Vstreameffectivelywithhighperformance.Inordertoresolovethisproblem,weshallfocusonseveralcriticaltechnologiesincludingA/Vcompression,transmissionprotocol,stre
7、amingserverofbothVODandLivemode.Thispaperrespectivelymakesresearchandoptimizationonthesecriticaltechnologies,resolvesproblemsincludingratecontrol,errorresilienceandserviceperformance,andultimatelyimplementsadistantmultimediateachingsystemwithconsiderationofthe
8、currentInternetcondition.Detailedly,thepapermakesaelaborateresearchandoptimizationformain-loopdesignandsomeimportantmodulesofMPEG-4includingvideoobjectextraction,ratecontrol,errorr
