基于特征点的对数极坐标变换图像配准算法-雷凯

32320075OPTICALTECHNIQUEVol.32No.3May2007:10021582(2007)03043503基于特征点的对数极坐标变换图像配准算法雷凯1,2,刘艳滢1,王延杰1,邢忠宝1,尹立敏1,2(1.,130033;2.,100039):,SUSAN,(),;,:;SUSAN;;:TP391.41:ALogpolartransformationbasedonfeaturepointsforimageregistrationLEIKai1,2,LIUYanying1,WANGYanjie1,XINGZhongbao1,YINLimin1,2(1.ChangchunInstituteofOptics,FineMechanicsandPhysics,TheChineseAcademyofSciences,Changchun130033,China)(2.GraduateSchooloftheChineseAcademyofSciences,Beijing100039,China)Abstract:Anewalgorithmaboutimageregistrationwaspresented,whichsolvedtranslations,rotationsandscaletransformationsproblemsinimageregistrationprocesswell.TheSUSANalgorithmwasusedtoobtainthefeaturepoints(interestingpoints)ofthetwoimages.Thebadfeaturepoints(thenoisepoints)wereeliminated.Theimprovedlogpolartransformationandprojectioncorrelationmatchingalgorithmwereusedtoacquiretheregistrationparameterofthetwoimages.Thesubpixellocationtechniquewasusedtoimprovetheregistrationprecision.Keywords:imageregistration;SUSANalgorithm;improvedlogpolartransformation;subpixellocation0,,,,,,,,[6],;[7][8],[2,5],[5],:,(),[7],,,,,,,;,11.1SUSAN,SUSAN:,,,[1];SUSAN[10],;,SUSAN[1]1.1.1SUSAN435:20060519;:20060724Email:[e-mail]:(1978),,,,15USAN1(a),,,5(),[(1)](univaluesegmentassimilatingnucleus,USAN)(b)5USANc(x,y)=1|I(x,y)-I(x0,y0)|t0|I(x,y)-I(x0,y0)|t(1)I(x0,y0)I(x,y);tt1(b),,USAN;,USAN;,USAN:USAN,SUSAN,SUSAN,[1,10,11]1.22(2),,I(x,y)I(,r)(2),(xc,yc)r=ln(x-xc)2+(y-yc)2=arctany-ycx-xc(2)(,),k1,k2,=k1r=k2(3),,MN,=k2(+M)=k2+k2M=+k2M(4)=k1lnN(x-xc)2+(y-yc)2=k1[lnN+ln(x-xc)2+(y-yc)2]=k1(lnN+r)=k1lnN+k1r=+k1lnN(5)(4)(5),,,1.3,(3)3(1)(4),(),,,T1(i1,j1)2),,,T2(i2,j2),T1(i1,j1),t1,T1;t2,T1t1=0.8t2=0.6,[10],,,,,,,,(3),,43632,,,:y=ax2+bx+c,:xp=-b/2a,:yp=(4ac-b2)/4a4,(xp,yp)(4),,,;,,,,2:5,256256128128lena;,,20(k1=20,k2=1):()(),,,90(a)(b)a(c)(d)c5(a)(b)6,,:(-90,14):m=90,:n=e14/k1=e14/20=e0.7=2.013753::,676SUSAN,,:m=30.2,n=e6/20=e0.3=1349859(),:x=11,y=573,,:SUSAN,:[1]SmithSM.BradyJM.SUSANAnewapproachtolowlevelimageprocessing[J].InternationalJournalofComputerVision,1997,23(1).[2]SchwartzEL.Spatialmappingintheprimatesensoryprojection:Analyticstructureandrelevancetoperception[J].BiologicalCybernetics,1977,25:181194.[3]SzeliskiR.Videomosaicsforvirtualenvironments[J].IEEEComputerGraphicsandApplications.1996.16(2):2230.[4].()[M].:,2003.[5]WolbergG.ZokaiS.RobustimageregistrationusingLogPolartransform[C].ICIP,2000.493496.[6],.[J].,2002,30(7).[7],.[J].,2004,20(2).[8],.[J].,2004,34.[9],.[J].,2005,26(3).[10],,.[M].:,2002.[11],.SUSAN[J].,2003,32(3).4373,: