AVS到MPEG-4的視頻轉碼研究與實現(xiàn).pdf

1、大連理工大學碩士學位論文AVS到MPEG4的視頻轉碼研究與實現(xiàn)姓名：張小羽申請學位級別：碩士專業(yè)：信號與信息處理指導教師：殷福亮陳喆20081201大連理工大學碩士學位論文ResearchandImplementationofTranscodingfromAVStoMPEG4AbstractWiththerapiddevelopmentofthemultimediatechnology，integrationamongdifferent

2、networkshasbecomeatreIld，suchastheintegrationbetweenwirelessnettheInternetandothernetworksAndtherealizationofseamlessconnectionindifferentnetworkvideoencodingschemeismoreandmoreimportantSincethealgorithmsvaryfromdifferen

3、tnetworks，itisnecessarytotranslatemebitstreamgeneratedbyonecoderSOthattheothercoderCallidentifyThistechnologyisnamedtranscoding碭esimplestvideotranscodingsolutionforthewholeprogramistheentirevideocodecalgorithm，thatis，dec

4、odetheoriginalvideosymbolstreamfirst，thenencodethegoalvideoHowever，therearemainlytwodrawbacksinthismethod：Firstthismethodrequiresalargeamountofcomputation，anditsamountofcomputationisthesumofdecodingcomputationinoneendand

5、encodingcomputationintheotherend；Second，theextratimedelayinvideoprocessingincorporatedbyrecodingmakethesolutionimpracticableInthispaper，combiningwiththeresearchresultsofthevideotranscodingandaccordingtotheprobleminentire

6、videocodecalgorithmthetranscodingfromAVStoMPEG4iSstudiedAndthenavideotranscodingalgorithmbasedontheimprovementisproposedInordertotranscodeAVStoMPEG4，thisalgorithmpresentsacompletesolutionbasedonthefastmappingandtransform

7、oftheparametersintheAVSbitstream，includingthegrammarinformation，theICTcoefficients，quantizedparameter(QP)，intraframepredictioninformation，motionvectorandremnantinformationTheexperimentalresultsrevealthatthisschemehasalmo

8、stthesamespeechqualitycomparedwithentirevideocodectranscodingalgorithm，andthecomputationalcomplexityintranscodingisreducedandthesystemprocessingtimeissavedremarkablyatthesametime／ThemainworkofthisthesisiSlistedasfollows：

9、(1)SomevideocodingtechnologiesappliedtomodemmultimediasystemsareintroducedAndtheapplicationbackgroundandthestateoftheartofresearchandthedevelopmentofthevideotranscodingarediscussed(2)Thevideocompressionencodingstructurea

10、ndthecomponentsareintroduced(3)TheencodingstructuresandthecodestreamstructureofAVSandMPEG4alediscussedindetailneintrapredictiontheinterpredictionjthetransformandquantizationtheentropycodingandthefilterarecomparedindetail