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1、appearedinProceedingsPCS'96,Melbourne,p.389-394,1996HistoricalFilmRestorationandVideoCodingD.SuterandP.RichardsonDept.Elect.andComp.Syst.Eng.MonashUniversity,Clayton3168Australiaemailsuter@fawlty8.eng.monash.edu.au,Fax:61399055682Abstracttointegratemanyofthetechniqu
2、esweuse,intoanMPEGorsimilarencoder,ratherthan,asweThispapersumarisesandextendsourprevioushavedoneinourexperiments,pre-processtheim-workinthevideocodingofhistorical lmmaterialagesandthenfeedthem"intoaconventionalen-(inparticular,a1906featurelength lm-whichcoder.Howe
3、ver,theveryextremenatureofthemayclaimtobethe rstfeaturelength lmeverartefactswedealwith,meansthatweprobablyproduced).Whileitmaybeusefultoemploydi-havetoprovidemorerobustandsophisticatedmo-gitalrestorationtechniquesonthismaterial,purelytionestimationproceduresthanwou
4、ldordinarilyforrestorationpurposes,wefocushereonlyonres-beapartofencodersformassmarketcontempor-torationinsofarasisnecessary/usefulforreducingary lmmaterial.encodingartefacts.Weconclude(section4)byplacingthisworkinthecontextofmuchbroaderaspectofhistorical lmprocessi
5、ng-suchasworkondetectionofscenechanges[2][7].1IntroductionWehaveshown[1],thathistorical lmmaterialsuf-fersfromseveredegradationwhencodedbycon-2ArtefactsventionalblockbasedencoderssuchasMPEG1.Historical lmmaterialtendstodi erfromcon-Inessence,theblockbasedencodersare
6、designedtemporary lmmaterialinanumberofimport-andtestedonimagesequencesthatdonotgen-antways.Someartefactsarelocal(smallscratcheserallyhavetheatypicalimagestatisticsofhistor-andotherblotches").Othersareglobal(frameical lmmaterial.Thatis,historical lmmaterial,mis-reg
7、istration,i.e.,jitter",imagebrightnessandwithitsowninherent(beforeencoding)artefacts,contrastvariations,i.e.,
icker".Moreovertherearesucientlydi erentfromcontemporary lmareseverelycorruptedframesduetosuchthingsasmaterial,that,theencodingprocesswillproducewarpinga
8、nddestructionofthelayersofthe lm).severeencodingartefactsonhistorical lm.OneFigure1depictssomeofthemoreobviousandex-aspectofthisisthatarte
