多描述視頻編碼方法研究.pdf

1、中國科學技術(shù)大學碩士學位論文多描述視頻編碼方法研究姓名：余海瑞申請學位級別：碩士專業(yè)：信號與信息處理指導教師：倪林20090501AbstractABSTRACTRecentlytheproblemofpacketslossanderrorsinvideocommunicationovererasurechannelsbecomesallimportanttopicAsaresult，multipledescriptioncodingi

2、sproposedasanefficientschemetotacklethisproblemMultipledescriptioncodingisabletoimprovetherobustnessThispaperresearchesonseveralmethodsofmultipledescriptionvideocodingwhicharewidelyusedinpracticalapplicationIncombination

3、withthelatestvideocodingstandardofH264andthespecificnetwork，previousschemesofmultipledescriptionvideocodinghavebeenimprovedinthispaperThemaincontributionofthispaperisasfollowing：Theunbalancedmultipledescriptioncodingcoul

4、dgivebettercontrolthanbalancedmultipledescriptioncodingontheamountofaddedredundancyInordertoimprovethecodingefficiencyanunbalancemultipledescriptionvideocodingschemewhichisbasedonSP—frameisproposedSPframewhichisaframecod

5、ingmethod，callreconstructthesameimagesequencesusingdifferentreferenceframesWithverysmallamountofredundancythisschemecouldlimiterrorpropagationintimedomainduringdecodingprocessingbyinsertingSPflamesinthedescriptionsFurthe

6、rmore，weproposeanunbalancedmultipledescriptionvideocodingschemebasedonregionofinterestsegmentationTheregionsofinterestaremoreattractivethanotherregionswhenuserswatchimageorvideosequencesFirstlyweuseallautomaticmodelingap

7、proachtodetectattentionregionsineachframeanddividetheframeintotwopartsThen，thetwopartsareencodedintothehighresolutiondescriptionusingmodifiedvideocodingstandardofH264，andthelowresolutiondescriptionisproducedbysamplingthe

8、imagesequencesinthetimeandspatialdomainThesimulationshowsthattheproposedmethodcouldeffectivelyprotectthedataintheregionofinterestandgainbettervideoqualityCrosslayeroptimizationmethodformultipledescriptioncodingoverspecif

9、icnetworkofadhocisproposedTheadhocnetworkissuitablefortransmittingthemultipledescriptiondatabecauseitCanprovidemultiplepathsWefollowacross—layerapproachandformulateanoptimalroutingproblemthatminimizestheapplicationlayerv