在全镇县乡人大换届选举工作会议上的讲话

Vol.13,No.9©2002JournalofSoftware1000-9825/2002/13(09)1852-06á1,2,1,31(,100080);2(,273165);3(,)E-mail:[e-mail];[e-mail]:;;;;:TP391:A[1].,[2~5]..[6].,,;,,[1].,.[7,8].[7,9].,,.[1,3~7],.,[10],.1.,,RADIANCE[11].,,,,..⎥⎦⎤⎢⎣⎡+⋅-+⎥⎦⎤⎢⎣⎡+⋅=sdpsdpnqnqttrrrð),0(Maxð),0(Maxrrrr.(1)(1)1,2.dr,srá:2002-03-23;:2002-06-10:(69873044;60033010;60072014);(RG022/01-02S/WEH/FST):(1970),,,,,,,;(1947),,,,,,,,.:1853,dt,st.:)1(4apCd-=r,(2)))(()(ppsssnvnqqfrrrrrr⋅-⋅=r,(3)pCarasd)1)(1(76--=t,(4)))(()()1(76ppsssnvnqqgraarrrrr⋅-⋅--=t,(5)⎩⎨⎧=),,(4342414aaaaaaars,(6)qr,vr,pnr,hr,C,p,,p=1.)(qfsr)(qgsr.,(7)(8).⎟⎟⎟⎟⎠⎞⎜⎜⎜⎜⎝⎛⋅⎥⎦⎤⎢⎣⎡-⋅=aa)()(expð41)(22ppsnhhnhqfrrrrrr,(7)⎟⎟⎠⎞⎜⎜⎝⎛-⋅=bb22expð1)(tqqgsrrr,(8)ð425wa+=a,vvtrrr=,ð25wb-=a.,,⎥⎥⎥⎥⎥⎦⎤⎢⎢⎢⎢⎢⎣⎡⋅⋅+⋅-=222)()()(expð41)(pyxyxsnhyhxhqfrrrrrrraaaa.(9),ð425wa+=ax,ð426wa+=ay,;w;a1,a2,a3,a4,a5,a6,a7,.2,,.,Lightfield[12].Lightfield..1,,,,.Fig.1Therelationbetweenanobjectanditsilluminationfield11854JournalofSoftware2002,13(9)..,,.:(1),;(2)(1),,,(1).,.,.3highdynamicrangeimage)[10].,.,CCD,,,,,,,,.,,,.,;.,,.,.4,,.,.RGB,.I2/1222)(⎟⎟⎠⎞⎜⎜⎝⎛++=∑iiiibgrI.(10)Io,Ir,[]∑-+-+-=-=irioirioirioirobbggrrII22222)()()(c.(11)(),,3.,c2..,,.,,,c2,.,Ir,,c2,,c2.5.,,,.,.,.,.,,,,,..RADIANCE[11].,,:1855.(image-basedlighting).RADIANCE,,.RADIANCE,,.6.DellDimension4100(Petium667MHzCPU,128MRAM),2~3.2().33,(a)(b).1,.2,,8.3,,.1.,Dielectric,RADIANCE,,12,.4,.Table1Comparisonoftrueandrecoveredparameters1ParametersModela1a2a3a4a5True0.80.60.30.90.01Recovered0.74370.60760.30820.85220.0102HorseError0.05630.09240.00820.04780.0002True0.70.70.70.120.125Recovered0.69590.70380.69110.10420.1032VenusError0.00410.00380.00890.01580.0218True0.70.20.11.5-Recovered0.69100.23490.07521.489-BunnyError0.00900.03490.02480.011-,,,,,,,.(a)Initialimages(a)(b)Imagesrenderedafterthelastpassofoptimization(b)Fig.33Fig.2Panoramasoftwotestscenes21856JournalofSoftware2002,13(9)Table2Thescopeandinitialvalueofeachparameter2ParametersModela1a2a3a4a5Upperbound1.01.01.01.00.3Lowerbound0.00.00.00.40.0HorseInitialvalue0.50.50.50.50.1Upperbound1.01.01.00.30.3Lowerbound0.00.00.00.00.0VenusInitialvalue0.50.50.50.20.2Upperbound1.01.01.02.0-Lowerbound0.00.00.00.0-BunnyInitialvalue0.50.50.51.0-,,,,,,,.,,,.3,2.,,..,,;,.7,,.,,.,,,..,,,.,.References:[1]Ramamoorthi,R.,Hanrahan,P.Asignal-processingframeworkforinverserendering.In:Fiume,E.,ed.ProceedingsoftheSIGGRAPH2001.NewYork:ACMPress,2001.117~128.[2]Boivin,S.,Gagalowicz,A.Image-Basedrenderingofdiffuse,specularandglossysurfacesfromasingleimage.In:Fiume,E.,ed.ProceedingsoftheSIGGRAPH2001.NewYork:ACMPress,2001.107~116.[3]Lensch,H.,Kautz,J.,Goesele,M.,etal.Image-Basedreconstructionofspatiallyvaryingmaterials.In:Gortler,S.J.,Myszkowski,K.,eds.ProceedingsoftheEurographicsWorkshoponRendering.Vienna:Springer-Verlag,2001.71~82.[4]Marschner,S.,Westin,S.,Lafortune,E.,etal.Image-BasedBRDFmeasurementincludinghumanskin.In:Lischinski,D.,Larson,W.,eds.ProceedingsoftheEurographicsWorkshoponRendering.Vienna:Springer-Verlag,1999.131~144.Fig.4Imagesrenderedwithrecoveredmaterials4:1857[5]Yu,Y.,Debevec,P.,Malik,J.Inverseglobalillumination:recoverreflectancemodelsofrealscenesfromphotographs.In:Rockwood,A.,ed.ProceedingsoftheSIGGRAPH’99.NewYork:ACMPress,1999.215~224.[6]Yu,Y.,Malik,J.Recoveringphotometricpropertiesofarchitecturalscenesfromphotographs.In:Cohen,M.,ed.ProceedingsoftheSIGGRAPH’98.NewYork:ACMPress,1998.207~217.[7]Debevec,P.Renderingsyntheticobjectsintoscenes:bridgingtraditionalandimage-basedgraphicswithglobalilluminationandhighdynamicrangephotography.In:Cohen,M.,ed.ProceedingsoftheSIGGRAPH’98.NewYork:ACMPress,1998.189~198.[8]Debevec,P.,Hawkins,T.,Tchou,C.,etal.Acquiringthereflectancefieldofahumanface.In:Akeley,K.,ed.ProceedingsoftheSIGGRAPH2000.NewYork:ACMPress,2000.145~156.[9]Sato,I.,Sato,Y.,Ikeuchi,K.Acquiringaradiancedistributiontosuperimposevirtualobjectsontoarealscene.IEEETransactionsonVisualizationandComputerGraphics,1999,5(1):875~882.[10]Debevec,P.,Malik,J.Recoveringhighdynamicrangeradiancemapsfromphotographs.In:Whitted,T.,ed.ProceedingsoftheSIGGRAPH’97.NewYork:ACMPress,1997.369~378.[11]Ward,G.TheRADIANCElightingsimulationandrenderingsystem.In:Glassner,A.S.,ed.ProceedingsoftheSIGGRAPH’94.NewYork:ACMPress,1994.459~472.[12]Levoy,M.,Hanranhan,P.Lightfieldrendering.In:Rushmeier,H.,ed.ProceedingsoftheSIGGRAPH’96.NewYork:ACMPress,1996.31~42.RecoveringMaterialforaHomogeneousObjectinanEnvironmentfromaSingleHighDynamicRangeImageáSUNQi-min1,2,WUEn-hua1,31(KeyLaboratoryofComputerScience,InstituteofSoftware,TheChineseAcademyofSciences,Beijing100080,China);2(ComputerScienceDepartment,QufuNormalUniversity,Qufu273165,China);3(FacultyofScienceandTechnology,UniversityofMacau,Macau,China)E-mail:[e-mail];[e-mail]