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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
