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ID:33506688
大小:3.52 MB
页数:86页
时间:2019-02-26
《基于h.264的运动估计与码率控制算法研究与实现》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、~‘、,jk东北大学硕士学位论文AbstractResearchandImplementationofMotionEstimationandnand‘R。。’‘at‘eControlAlgorithmBasedonH.264AbstractAlongwiththefastdevelopmentofnetworkandmobilecommunication,processingandtransmissiontechnologyofvideoinformationinInteractandmobilenetworkhasbecomeahotspot
2、researchnowadays.ThenewgenerationofvideoencodingstandardH.264adoptsplentifuladvancedencodinganddecodingtechnology,H.264ismuchbetterthanothervideoencodingstandardinPSNR,compressionefficiency,network-adaptabilityandvisioneffect.Asaresult,thestandardgetsmuchattentionfromacademi
3、candindustrialfields.ThispapermainlyresearchesthenewtechniquesinH.264,emphasizestwokeytechniques:motionestimationandratecontr01.H.264codecenhancesthecompressiveperformance,howeverthegrowthofthecomputingcomplexityisdoubled.Basedonresearchonsometypicalblock·matchingmotionestim
4、ationalgorithms,thispaperpresentsanovelmotionestimationsearchalgorithmbasedonUnsymmetrical-CrossMuti-HexagonSearchalgorithm(UMHexagonS),thefirstimprovementisaddinganadaptivethresholdwithwhichdifferentsearchalgorithmsareusedaccordingtothecontentoftheimage.Thesecondimprovement
5、ispresentingthesearchalgorithmbasedoneffectiveregioninthehexagonalgridsearch,thesearchalgorithmisRegionSearchBasedonHexagon(RSHEXAGON).Thethirdimprovementisusinglargeandsmalldiamondsearchmodeinsteadofextendedhexagon-basedsearch.Thenewalgorithmrealizestheaimoffastsearchandavo
6、idsproblemsthattheexistingfastsearchalgorithmistoocomplexwhensearchoptimalpointandreducescomplexityofcodec.MostvisualcommunicationUSeSafixedratetransmissionchannel,whichmeanstheencoder’Soutputbitratemustbelimitedtotransmissionbandwidth.Itisnecessarytogivetheratecontrolalgori
7、thmthatcantransmitcodeddatawithinthegivenbandwidtheffectivelyandensuregoodandsteadyreceivedquality.InH.264standard,itdoesnothandletheratecontrolwell.ItUSeSquantizationparameterbothinratecontrolandRate—Distortionoptimization,resultinginthechicken-eggdilemma.Inthispaper,anewra
8、tecontrolalgorithmbasedonimagecomplexityisproposed,thechicken—eggdilemmaCan
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