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1、～‘、，jk東北大學(xué)碩士學(xué)位論文AbstractResearchandImplementationofMotionEstimationandnand‘R。。’‘a(chǎn)t‘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
