Advances in Light Microscope Stereo Vision

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1、AdvancesinLightMicroscopeStereoVisionbyH.W.Schreier,D.GarciaandM.A.SuttonABSTRACT--Theincreasingresearchfocusonsmall-scaleisagrowinginterestinmeasurementsatthemicroscalemechanicalsystemshasgeneratedaneedfordeformationornanoscale.Inthisregard,anactiveareaofresearchisandstrainmeasur

2、ementsystemsformicroscaleapplications.focusedontheuseofthescanningelectronmicroscopeOpticalmeasurementsystems,suchasdigitalimagecorrela-toobtainthree-dimensional(3D)shapeanddisplacementtion,presentanobviouschoiceduetotheirnon-contactingna-measurements.10-14Interestingly,alimitednu

3、mberofpapersture.However,thetransferofmeasurementtechnologydevel-describetheuseofdigitalimagecorrelationincombinationopedformacroscaleapplicationstothemicroscalepresentswithlightmicroscopes.15-17uniquechallengesduetothedifferencesintherequiredhigh-Thispaperfocusesontheuseofdigital

4、imagecorrelationmagnificationoptics.Inthispaperweillustratetheproblemsinvolvedincalibratingastereomicroscopeusingtraditionalforstereomicroscopyapplications.Theprincipleofstereotechniquesandpresentanovelmethodologyforacquiringimagecorrelationanddisplacementfieldmeasurementisil-accu

5、rate,three-dimensionalsurfaceshapeanddeformationlustratedinFig.1whichshowsastereoimagepairofadataonsmall-scalespecimens.stampingpartbeforeandafterdeformation.ThetechniqueExperimentalresultsdemonstratethatstereomicroscopeusesdigitalimagecorrelationalgorithmstodeterminepointsystemsc

6、anbeaccuratelyandreliablycalibratedusingapri-correspondencesbetweentheimagesacquiredfromthetwooridistortionestimationtechniquesincombinationwithtradi-camerasofthestereosystem.Afterdeterminingthecalibra-tionalbundle-adjustment.Theuniquefeatureofthepresenttionparametersofacameramode

7、lforeachcameraaswellasmethodologyisthatitdoesnotrequireaprecisioncalibrationtheirrelativeorientationinspace,theshapeofthespecimentargetbutreliessolelyonpointcorrespondencesobtainedbyimagecorrelation.Avarietyofexperimentsillustratethecanbereconstructedfromthepointcorrespondencesusi

8、ngmeasurementperformanceofastereo