AVS視頻編碼標(biāo)準(zhǔn)中運動估計技術(shù)的研究.pdf

1、江蘇大學(xué)碩士學(xué)位論文AVS視頻編碼標(biāo)準(zhǔn)中運動估計技術(shù)的研究姓名：丁燕申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：閆述20081201江蘇大學(xué)碩士學(xué)位論文ABSTRACTABSTRACTTosavethenetworkbandwidthstoragespace，videocodinghasbecomeoneofthehotissuesofresearchandindustrialapplicationsSofartheintemati

2、onalcommunityhassetaseriesofvideocodingstandards，suchasMPEGx，H26xToimprovethevideotechnologyinChinaAVSvideostandardisdevelopedbytheAudioVideoCodingStandardWorkingGroupofChinawhichWasapprovedinJune2003AVSvideostandardprov

3、idesagoodtrade—offsolutionbetweencomplexityandencodingefficiencyInvideocodingsystem，motionestimationplaysaveryimportantroleineliminatinginterframeredundancyandimprovingtheperformanceofvideocodenOnonehand，theaccuracyofmot

4、ionestimationaffectstheefficiencyofthevideocoderOntheotherhand，thecomplexityoftheencoderliesonthatofthemotionestimationalgorithmThispaperstudiesthemotionestimationwithhighcomplexityinAVS，includingtheintegerpixelpartandth

5、esubpixelpartFortheintegerpixelpartofUMHexagonS(Unsymmetrical—crossMulti—HexagongddSearch)，theoriginalalgorithmcontinuesthehexagonsearchordiamondsearchaftertheinitialsearchpointprediction、析tllgoodeffectThatproducessomere

6、dundantsearchwhichisthesameassomesearchpattemisfixedwithoutconsideringdifferentcasesOnthebaseofthat，anearlyterminationisaddedaftertheinitialsearchpointpredictionandthesearchpatternisadaptedwiththedifferentblocktypeForthe

7、subpixelparttheoriginalalgorithmusestheHFPS(HierarchicalFractionalPelSearch)algorithmiftheblocktypeis16x16、16x8and8x16HFPSalgorithmisakindoffullsearchalgorithmofsub—pixelwiththebestperformance，butthemosttime—consumingCon

8、sideringthatthemotionvectorsofsubpixelisusuallyaroundtheinitialsearchpoint，analgorithm晰ⅡladaptivesearchpattembasedondiamondpatternisproposedinthispaperItdecidesthenextstepafterjudgingthebestmatchingpoint’SpositionThetest

9、showsthattheimprovedalgorithmcouldreducethetimeconsuminginmotionestimationwithonlyalittledecreaseinbitrateandhardlylossinimagequalityItbasicallyachievestheanticipativegoalKeywords：AVS；VideoCoding；MotionEstimation；EarlyTe