super-resolution

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1、Super-ResolutionMay2004,Vo1.19,No.3,PP.405412J.Comput.Sci.&TechnolSuper—ResolutionReconstructionofImageSequenceUsingMultipleMotionEstimationFusionChengWangandRun—ShengWangATRNationalLaboratory,NationalUniversityofDefenseTechnology,Changsha$10073,P.R.ChinaE—mail:chwang—nudt@263.net;rswang@

2、nudt.edu.cnReceivedJuly2,2002;revisedNovember28,2003.AbstractSuper—resolutionreconstructionalgorithmproducesahigh-resolutionimagefi'omalow—resolutionimagesequence.TheaccuracyandthestabilityofthemotionestimationfME)areessentialforthewholerestoration.Inthispaper.anewsuper—resolutionreconstructi

3、onalgorithmisdevelopedusingarobustMEmethod,whichfusesmultipleestimatedmotionvectorswithinthesequence.Thenewalgorithmhastwomajorimprovementscomparedwiththepreviousresearch.First.insteadofonlytwoframes.thewholesequenceisusedtoobtainamoreaccurateandstableestimationofthemotionvectorofeachframe;se

4、cond.thereliabilityoftheMEisquantitativelymeasuredandintroducedintothecostfunctionofthereconstructionalgorithm.Thealgorithmisappliedtobothsyntheticandrealsequences.andtheresultsarepresentedinthepaper.Keywordsimagesequence,superresolution,motionestimation,fusion1IntroductionHigh—resolutionimag

5、esareusefulandoftencriti—calinmanyapplications.ThetraditionalapproachofimprovingresolutionistoincreasethenumberofCCDsensorsanddecreasetheirsize.Thecostandphysicalrequirementsinvolvedareoftenun—acceptable.Anothereffectiveapproachistore—storehigh—resolutionimagesusingsignalprocessingtechniques.

6、Oneofthepromisingsignalprocess—ingtechniquesisthesuper--resolutionreconstruc?-tionofimagesequence,whichreconstructsahigh—resolutionimagefromalow—resolutionimagese—quence.Theadvantagesofthetechniqueareob—vious.Firstly,itislowcost.Secondly,itcanre—constructhigh—resolutionimagesfromthealreadvacq

7、uiredlow—resolutionsequences,manyofwhichmightnotbeacquiredagain.Thegeneralsuper-resolutionreconstructional—gorithmconsistsofthreesteps.First,adegra—dationmodeldescribingtherelationshipbetweenthelow..andthehigh..resolutionimagesneedstobedevelo