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1、COMPUTERVISIONANDIMAGEUNDERSTANDINGVol.66,No.1,April,pp.25±32,1997ARTICLENO.IV960500NOTEOptical-Model-BasedAnalysisofConsecutiveImagesNAOKIMUKAWA*LaboratoryforInformationTechnology,NTTDATACorporation,Kawasaki-shi,Kanagawa,JapanReceivedJuly27,1993;acceptedDecember26,1995luminancevaluesobtainedb
2、yanopticalprocess,however,Mostexistingalgorithmsforanalyzingamovingsceneusecarrythreekindsofinformation:(1)aboutthegeometrya3-dimensionalgeometricmodelconsistingofanobjectand(orshape)ofobjects,(2)aboutthephysicalpropertiesofavieweranddisregardopticalprocesses.So,theycannotbeobjectsurfaces(re¯e
3、ctioncoef®cient,color,etc.),and(3)appliedtorealisticscenes,suchasthosewithlightsources.abouttheenvironment(illumination,re¯ectionfromotherThispaperthereforepresentsacomprehensiveimageanalysisobjects,etc.).The2-Dfeatureswhichareobtainedbybasedona3-dimensionalopticalmodelthatincludeslightimagepr
4、ocessingmethodsthatdisregardopticalprocesssourcesaswellastheobjectandtheviewer.Theopticalmodelarethereforeofteninappropriateforrecovering3-Dinfor-providesaphotometricconstraintdescribingthegeometricrelationshipbetweenlightsourcesandsurfaceshape,andthemation.Theconventionaloptical-¯ow-based3-Dr
5、estora-constraintservesasthebasisforanewalgorithmthatestimatestionalgorithmsarethusapplicableonlytoscenesforwhichoptical¯ow,objectshape,surfacere¯ectioncoef®cients,andthelightsourcescanbeneglected.illuminantdirectionfromconsecutiveimages.ItisshownthatTheaimofthepaperistoovercomethisproblemfort
6、heparameterisnotjustacorrectionterminestimatingopticalthegradient-basedapproach.Thispaper®rstpresentsan¯owbutalsoaphotometrictermhavingphysicalmeaning.opticalmodelthatincludesthelightsourceaswellastheThisisprovedbyshowingthatincidentlightsourceandsurfaceobjectandaviewpoint,andthenprovidesanewp
7、hotomet-re¯ectioncoef®cientscanbeestimatedusingtheparameter.ricconstraintforamovingscene,aconstraintthatdescribesTheanalysiscanprovideenoughparametersforregenerationthegeometricrelationshipbetweenlightsourcesandtheofasceneusingcomputer-
