基于MATLAB的数字图像的边缘检测

272Vo.l27No.220104JOURNALOFJILININSTITUTEOFCHEMICALTECHNOLOGYApr.2010:2010-03-02:(1963-),,,,,.:1007-2853(2010)02-0059-03MATLAB张秀兰(,132022):,Canny.MatLab,,.:Canny.:;;;:TP391:A.,,,,,,,,[1].,.,.,.1MATLABMATLAB,,,,..,.,MAT-LAB,,[2].MATLAB,.2.(Edge),.[3].,.,,.,.3,,,..,,..,[3].,.,.,,[4],(Laplacian)Canny(LOG).3.1(LOG)(LOG).,.3.1.1,.G(x,y)=Aex2+y22R2=AE-r22R2,3@3116121242121.3.1.2(Laplace),f(x,y):¨2f=92f9x2+92f9y2,:0-10-15-10-10.3.2CannyCanny,,.,.:(1)f(x,y),F(x,y)=[G(x,y)]*f(x,y)=G(x)*G(y)*f(x,y).(2).,I(x,y),3@3xyPx(x,y)Py(x,y).Px(x,y)=Ez=y+1x=y-1[p(x+1,z)-p(x-1,z)]+[p(x+1,y)-p(x-1,y)],py(x,y)=Ez=y+1x=y-1[p(z,y+1)-p(z,y-1)]+[p(x,y+1]-p(x,y-1)],M(x,y)=p2x(i,j)+p2y(i,j),H(i,j)=py(i,j)px(i,j).4MATLABMATLABedge,,().edge,[5].1edge.Clear;Closeal;lt1=imread(cD:\tu1.bmpc);t2=edge(I,clogc);t3=edge(I,ccannyc);figuresubplot(1,3,1)imshow(t1);subplot(1,3,2)imshow(t2);subplot(1,3,3)imshow(t3);16020105,,.,,,.canny,,,.Canny,,,,.:[1].[M].:,2002:25-79.[2].MATLAB7.0[M].:,2006:407-428.[3],,,.[J].,2008,24(5):31-33.[4].[J].,2009,19(4):122-123.[5],.Matlab[J].,2005,20(6):21-23.Edgedetectionfordigitalimagebased-onMatlabZHANGXiu-lan(CollegeofSciences,JilinInstituteofChemicalTechnology,JilinCity132022,China)Abstract:Edgedetectionisoneofthemainmethodsintheresearchfieldofdigitalimageprocessing,inwhichtheLaplaceGaussoperatorandCannyoperatorareintroducedinthispaper.TheimageprocessingfunctionprovidedbytheMatLabimageprocessingtoolboxisemployedtoperformedgedetectionforimagesothattherelevantprogramandprocessingresultsareobtained.TheresultshowsthattheedgedetectionofLaplaceGaussoperatorandCannyoperatorisclearandhaslittlenoise.Keywords:digitalimage;Laplaceoperator;edgedetection;gradient612:MATLAB