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1、ObjectShapeandReflectanceModelingfromObservationYoichiSato1,MarkD.Wheeler2,andKatsushiIkeuchi11InstituteofIndustrialScience2AppleComputerInc.UniversityofTokyoABSTRACTincreaseinthedemandfor3Dcomputergraphics.Forinstance,anewformatfor3Dcomputergraphicsontheinternet,
2、calledVRML,isbecominganindustrialstandardformat,andthenumberofappli-Anobjectmodelforcomputergraphicsapplicationsshouldcontaincationsusingtheformatisincreasingquickly.twoaspectsofinformation:shapeandreflectancepropertiesoftheobject.Anumberoftechniqueshavebeendevelo
3、pedformodelingHowever,itisoftenthecasethat3Dobjectmodelsarecreatedobjectshapesbyobservingrealobjects.Incontrast,attemptstomanuallybyusers.Thatinputprocessisnormallytime-consumingmodelreflectancepropertiesofrealobjectshavebeenratherlimited.andcanbeabottleneckforrea
4、listicimagesynthesis.Therefore,Inmostcases,modeledreflectancepropertiesaretoosimpleortootechniquestoobtainobjectmodeldataautomaticallybyobservingcomplicatedtobeusedforsynthesizingrealisticimagesoftherealobjectscouldhavegreatsignificanceinpracticalapplications.objec
5、t.AnobjectmodelforcomputergraphicsapplicationsshouldInthispaper,weproposeanewmethodformodelingobjectreflec-containtwoaspectsofinformation:shapeandreflectancepropertiestanceproperties,aswellasobjectshapes,byobservingrealobjects.oftheobject.Anumberoftechniqueshavebee
6、ndevelopedformod-First,anobjectsurfaceshapeisreconstructedbymergingmultipleelingobjectshapesbyobservingrealobjects.Thosetechniquesuserangeimagesoftheobject.Byusingthereconstructedobjectshapeawidevarietyofapproacheswhichincludesrangeimagemerging,andasequenceofcolo
7、rimagesoftheobject,parametersofareflec-shapefrommotion,shapefromshading,andphotometricstereo.Intionmodelareestimatedinarobustmanner.Thekeypointofthecontrast,attemptstomodelreflectancepropertiesofrealobjectsproposedmethodisthat,first,thediffuseandspecularreflectionhav
8、ebeenratherlimited.Inmostcases,modeledreflectanceproper-componentsareseparatedfromthecolorimagesequence,andthen,tiesaretoosimpleortoocomplicatedtobeusedforsynth
