电影胶片修复及噪声处理关键技术的研究

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1、上海交通大学博士学位论文电影胶片修复及噪声处理关键技术的研究姓名：周磊申请学位级别：博士专业：通信与信息系统指导教师：周源华20080101上海交通大学博十论文块的运动检测器，为了处理镜头摇摆带来的误判，还增加了全局运动估计和基于块的运动补偿。面对低亮CCD视频，该算法在高效修复的基础上，保持了较低的算法复杂度，有效地去除了低亮场景下的灰度噪声和彩色噪声，并且提升了编码器的编码帧率，降低了压缩流码搴。关键词：电影修复；直线划痕；亮度闪烁；空间一时间降噪；低亮度去噪ABSTRACTAbstractOld

2、filmrestorationisofleofkeytechnologyandhasdrawntremendousattentioninresearchofcomputervision，digitalimageprocessing，digitalvideoprocessinganddigitalprogramnon-lineareditingtechnology．Inthisthesis，thedigitalfilmrepairscheme，thebasictheoryofvideorestorati

3、onandmathematicalmodelsofseveraltypicalartifactsareinvestigated．Byfullytakingadvantagesoftheexistedvideoprocesstheorytechnologyonrelatedapplications，thisthesisdeeplyanalyzesthedetectionandremovalmethodforstabilization，scratch，flicker,imagenoiseandlowlig

4、htlevelCCDnoise，extendtheresearchuponaboveartifactfeaturesinspaciaiandtemporalfield,reducethecomplexityofrestorationalgorithmsandimprovetheftrepairingeffect．Inthisthesis，weprovidesomenovelcorrespondingdetectionandrestorationalgorithms，whichnotevenenhanc

5、ethequalityofrestoredsequence，butalsoimprovetheefficiencyofvideoencoderwhencompressingthefilmsequencedegradedbythesekindsofartifacts．ThecreativitiesandcontributionarediscussedindetailaSfollows：Firstly，thetechnologicalframeworkandbasictheoryofdigitalvide

6、oreal—timestabilizationarepresented．Herewereviewtwotypicaltraditionalalgorithmsforvideoanti—shaking，thenproposeareal·timevideostabilizationsystem．whichincludesallstepsforstabilizedvideogenerating．Someinnovativedesignsarepresentedinglobalmotionanalysis，l

7、ocalmotionblockremoval，constraintoflimitededgeforcropping，frame’sedgeextending，stabilizedframereconstruction，etc．Thissystemhasthreeworkingmodes，Cansupportdifferentsizesforinputandoutputvideo．Itnotonlygetsgoodeffectonsmoothingtranslationandrotationunstea

8、diness，butalsoreachesahi曲speedperformanceandfitsformanyapplicationsonlowspeedenvironment，suchastheembeddedplatform．Secondly,wedescribethevisualfeatureoflinescratch，improvethemathematicalmodelandspacialmethodoflinescratchdetection