針對人臉區(qū)域的碼率控制技術研究.pdf

1、西南交通大學碩士學位論文針對人臉區(qū)域的碼率控制技術研究姓名：朱柳申請學位級別：碩士專業(yè)：計算機系統(tǒng)結構指導教師：彭強20100601西南交通大學碩士研究生學位論文第1I頁AbstractH264／AVCvideocodingstandardwhichisthenewestvideocodingstandardispaidcloseattentionwithitshighercompressionefficiencybetterimage

2、quantityandnetworkcompatibilityRateControlasaveryimportantpartofthevideocompressingencode，callcomputeQPandhasresponsibilitytOallcocatebitattheframe—levelandmacroblock—levelThepapermainlyresearchesonRatecontrolalgorithmof

3、H264／AVCatthelowbandwidthincludethefollowingtwoareas：First，thevideoqualityCannotmeettheneedatthelowBandwidth，SesearchersmakesomemethodstoincreasethequalityofROIandhopetomeetpeople’SneedusingthismethodAratecontrolalgorith

4、mbasedRegionofinterestisproposedinthispaperthealgorithmwhichestablishsalleffectivemethodintheROIextraction，worksatframelevelandthebasicunitlevelThealgorithmimprovesthetacticstOallocatethebitattheframelevelandimporvestheM

5、ADpredictionatthebasic—unitlevelThealgorithmalsoenhancesthebitintheregionofinteresttaisethequalitytheresultsshowsthealgorithmincreasePSNRandimprovesthesubjectivequalityAratecontrolalgorithmisproposedbasedonanalyzingthela

6、ckofMADpredictionlinearmodelthealgorithmpredictsMADusingtheimformation“oftimeandspace，andthiswayismorepreciserthantheoriginalwaywhichonlyusetheimformationofspace。Thepaperimprovesthetacticsofbitallocationatframelevelbased

7、onthenewMADpredictionmodelthenewwayofbit—allcocationaanadaptivelyallocatethebitcombiningthebufferfullnessandthecodingcomplexitytheresultshowsthealgorithmCanincreasePSNRKeywords：H264；RateControl；RegionofInterest；MADpredic