光学专业外文文献翻译.docx

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1、光学专业外文文献翻译文献原文：Title：Phase-shiftingdigitalholographyinimagereconstructionAbstract:Aphase-shiftingdigitalholographyschemedevelopedtoinvestigateinternaldefectsinartworksisdescribed.Phase-shiftingisutilizedtoobtainaclearreconstructedobjectwavefromaroughsur

2、facetexture・Areverse-transformalgorithmisemployedtoreconstructtheobjectwaveonitsoriginalpositionofunknowndistaneeortheimagingpositionfromtheobjectwaveinformationontheholographicplane.Togettheclearestreconstruct!ontheexactregistrationoftheunknowndistance

3、isdeterminedbyapplyingtheintensitysumastheauto-focusingfunction.Thespatialresolutionofthereconstructionimageisalsoinvestigatedforavarietyofaffectingfactors.Laboratoryresultsofreconstruct!onimagesunderdeformationarepresented・Keywords:holographicinterfero

4、metry,digitalholography,phase-shiftingtechniqu巳reverse-transformalgorithm,auto-focusingfunction,spatialresolution.(1IntroductionDifferentmethodsofholographicinterferometryrelatedtechniqueshavebeenusedeffectivelyfordefectvisualisationinartworkdiagnosis.P

5、hysicalreconstructionofrecordedwavefieldsthoughisoflimitedapplicabilityforon-fieldorremoteapplicationsusuallyrequiredinartconservationenvironments.DigitalcounterpartsexplorednowadaystorecordtheinterfereneebetweenanobjectanditsrefereneeonCCDandreconstruc

6、ttherecordnumericallyarebettersuitedforfielduse・Howevertheydonotprovidetheessentialspatialresolutionforcleanobjectreconstructionanddefectdetection,bothcriticalinartworkdiagnoSticassessment.Towardsthisgoal,thisstudyaimsatovercomingtheabovelimitationsande

7、xpandingtheuseofsuchtechniquesinthefieldofartworksconservation.Aprincipalproblemindigitalholographyofartworksistoobtainaclearreconstruction.Toaccomplishthisthefollowingproblemsshouldbeaddressed:(1)needofaproperalgorithmforthereconstructionofrecordedimag

8、es,(2)removaloreliminationofspecklenoiseinthereconstructedimageandphasemap,(3)determinationoftheactualregistrationdistanee,(4)improvementofspatialresolutionofthereconstructedimage・Thefirsttwoproblemsisreferredtoasreconstructional