集装箱检测图像识别技术研究

,,(,100084):60,,,:;;;;;:TG115.28:A:100026656(2002)1220519203RESEARCHONIMAGERECOGNITIONFORCONTAINERINSPECTIONLIUJin2hui,ANJi2gang,ZHOULi2ye(InstituteofNuclearEnergyTechnology,TsinghuaUniversity,Beijing100084,China)Abstract:Imagerecognitiontechniquewasgivenbasedontheimagesof60Cocontainerbyusing22DFouriertransform,22Dwavelettransform,neuralnetwork,andfeatureextractiontechniques.Theinspectionresultsshowedthecorrectnessandfeasibilityofthemethod.Keywords:Radiographicinspection;Imagerecognition;Fouriertransform;Neuralnetwork;Wavelettransform;Featureex2traction,,,,,601[1]F(u,)=1NMM-1x=0N-1y=0f(x,y)e[-i2(ux/M+y/N)](1)i=-1u=0,1,2,,M-1=0,1,2,,N-1f(x,y)=M-1u=0N-1=0F(u,)e[i2(ux/M+y/N)](2)x=0,1,2,,M-1y=0,1,2,,N-1:2002204215M,Nx,yF(u,)f(x,y),(PSD),PSD(u,)=|F(u,)|2=R2(u,)+I2(u,)(3)(FFT),FFT,,,,FFT,,,VisualC++2,,BP,,,1BP9152412200212NDTVol.24No.12Dec.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1BP,,,,,/,BP,VC++3,,f(x1,x2),x1,x2,(x1,x2),;b1,b2(x1,x2)(x1,x2),[2];b1,b2(x1,x2)=1x1-b1,x2-b2(4)0b1,b2,,1/WTf(;b1,b2)=f(x1,x2),;b1,b2(x1,x2)=1kf(x1,x2)x1-b1,x2-b2dx1dx2(5)Daubechies(D),,Dh0(n),h1(n)[3]h1(n)=(-1)n-1h0(2N-n+1)(6)n=1,2,3,,2Nh0(n)h1(n)C/C++,,,,4,,,Karhunen2Love(K2L),,K2L,X,X=[x(0),x(1),,x(n-1)]T,CX[4]CX=E[(X-UX)(X-UX)T]=C00C01C0n-1C10C11C1n-1Cn-10Cn-11Cn-1n-1(7)UXXUX=E[X]CXX,X,CXK2LU,UXYCY,:[4](1)nCX0,1,,n-1,|1I-CX|=0(8)(2)CXnui(i=0,1,,n-1)(3)u0,u1,,un-1,ui,ui=1(i=0,1,,n-1),ui,ui=uiT,ui=1(9)(4)u0,u1,,un-1,UU=[u0,u1,,un-1](10)(5)Y=UTXXK2L,CY=UCXUT=0010n-1(11)025:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.CY,,K2L,K2LCX,X,,5Windows98,MicrosoftVisualC++5.0,BP,22,;,,,,,;BP,.cpf.cpf3,3a.cpf,,;3b.cpf,,,,4.cpf,,(),6,(a)(b)34,K2L,VisualC++,,,:[1],.[M].:,1998.[2].[M].:,1999.[3].[M].:,1998.[4],.[M].:,1988.2003125:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.