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1、西南交通大學(xué)碩士學(xué)位論文基于H.264標準的運動估計算法研究姓名:王立飛申請學(xué)位級別:碩士專業(yè):通信與信息系統(tǒng)指導(dǎo)教師:唐小虎20080701西南交通大學(xué)碩士研究生學(xué)位論文第ll頁I
2、——一————————一,——IllllllllII●AbstractThemotionestimationresearchonvideocompression,whichisbasedonthenewH.264videocompressionstandard,hasbeenquiteinterestedbyresearchersinvideocompressionf
3、ield.Theeffectofefficiencyformotionestimationalgorithmmainlyliesinthreeareas,namelyqualityofreconstructedimage,compressionrateandspeedofsearching.Consideringtheaccuracyofsearch,iftheestimationforaccuratemotionismoreaccurate,thenthequalityofthepredictivecompensationimageisbette
4、r,themargincompensationandthebitsforcompensationissmaller,andthebitrateislower.Consideringtherateofsearch,thehighertherateis,thebetterapplicationinthereal—timeenvironmentiS.Therefore.theresearchdirectionformotionestimationalgorithmistodoimprovementsonbothaccuracyandrateforsear
5、ch.ThisessaystudiesonthetechnicalcharacteristicsofH。264standard,andprinciplesofmotionestimationandmotionCompensation.Firstly,ananalysisforthealgorithmsoftheclassicthree·stepsearch,thenewthree—stepsearch,thediamondsearchandthehexagonsearchisgiven.Thenbasedontheimprovedalgorithm
6、stillnow,theauthorpointsouttheresearchdirectionforthemotionestimationalgorithm.BasedonthestudyoftheUMHexagonSalgorithmandaimedtotheshortcomingofexcessivesearchpointsandinsufficiency,thispaperproposessomeimprovement:becausethehelixsearchof25pointsdonotconsidersthespecificmotion
7、vectordistribution,thesearchpointsisrevisedtoninepoints;thenon—-uniformmulti··storeyhexagonsearchdonottakeadvantageoftheimagemotioncharacteristic,whichleadstoexcessivesearchpoints,SOthispaperproposesanewsearchcyclostyle;theunsymmetrical—crosssearchismodifiedtosymmetrical·cross
8、search。酉南交通大學(xué)碩士研究生學(xué)位論文第lll頁IIllllIll——一——一i___●_-_--_--_-_-____-__-●_____--___-●____--Thenewalgorithmmakesuseofvariousoftestsequences,makessurethatthePSBRandbitrateguaranteed,andlowerstimeforsearchandmotionestimation.Thispaperalsoresearchesotherimprovementintheworldandhasbette
9、rresultscomparedwiththetwoimprovementwaysinthem.KeyWords:Moti