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(,230039),,AUTOMATICEXTRACTIONOFFLAWEDGEINFORMATIONININFRAREDNONDESTRUCTIVETESTINGRenBin(AnhuiUniversity,Hefei)AbstractZero2crossingedgedetectionmethodwasanalyzed.Inviewofthepropertiesofinfraredthermalimages,narrow2rangezero2crossingedgedetectionmethodwasappliedtodetecttheedgesofweldingflawsandgoodresultswereobtained.KeywordsInfraredtestingSignalprocessingWeldingflaw,,,2233,,,[1],,,,1,(1a,d),,,,,,f(x,y),xy,Laplacian¨2f(x,y)=¨2xf(x,y)+¨2yf(x,y)=f(x+1,y)+f(x-1,y)+f(x,y+1)+f(x,y-1)-4f(x,y)(1)119222720007NDTVol.22No.7July2000©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,f(x,y)(x,y),(x,y)2,,,,,,f(x)dfdx,dfdx,f(x),d2fdx2=0,d3fdx30,,dfdxõd3fdx30(2),,n=¨fû¨fû(3),K=5f5nõ53f5n3(4)K0,;K0,;K=0,,,Laplacian¨2f=fxx+fyy¨2f,,K=¨(¨2f)õ¨f(5)Clark[2]3,,,F24,(AGA2780)2[3],,,,,2,,[4,5]ht(3)htht$f($f),ht,:(1)(2)[4,5]ht(3)$f,$f20(4)(ht$f),3292:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.44.12,,,Hough,Sobel,,Hough(x-a)2+(y-b)2=r2(6)a,br,,,a,br,Hough:(1)(a,b,r)(2)A(a,b,r),,(3)(x-a)2+(y-b)2-r2=E,a,br,,1,E[-e,+e]ee=3()(4),(a0,b0,r0)(a0,b0),r0,g(x,y)=f(x,y)(x-a0)2+(y-b0)2r020(x-a0)2+(y-b0)2r02f(x,y)g(x,y)(4)4Hough4.25,,,,,,6,ht=89$f=20,,7(5),5,Hough,,,,,56ht=89$f=207(296)392:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.8ömm,2(CCD,),3Origin234(8),Pö2,CCD;CCD,;,,;CCD,0.2,1ö303,,,,,,1TakedaM,InaH,KoboyashiS.JOptSocAm,1982,72(1):156-1602TakedaM,MutohK.AppOpt,1983,22(24):29773TangShouhong,HungYY.AppOpt,1990,29(20):3012-30184IdesawaMetal.AppOpt,1977,16(8):2152-21625ReidGT,RixonRC,MesserHI.Opt&LasTec,1984,315-3196,..,1994,15(3):22-277,.2.,1992,7(2):159-1658,,SurrelY..,1995,16(4):290-2989ShoughDM,KwonOY,LearyDF.ProcSPIE(Vol.1221),1990.1221:39410GuR,YoshizawaT.ProcSPIE(Vol.1720),1992.47011KwonOY.ProcSPIE(Vol.816),1987.196:2000201213(293),1,..:,1993.2ClarkJJ.Authenticatingedgesproducedbyzero2crossingalgorithm.IEEETransonPAMI211,1989(11):433,,..,1991,13(1):12-154,,..(),1996,20(2):58-625,,..,1997,2(4):2306ChenJS,MedioniG.Detection,locatizationandestimationofedges.IEEETranonPAMI,1989(11):191-198:1998207211692:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.