Illumination robust interest point detection.pdf

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1、ComputerVisionandImageUnderstanding113(2009)565–571ContentslistsavailableatScienceDirectComputerVisionandImageUnderstandingjournalhomepage:www.elsevier.com/locate/cviuNoteIlluminationrobustinterestpointdetectionMuratGevrekci,BahadirK.Gunturk*DepartmentofElectri

2、calandComputerEngineering,LouisianaStateUniversity,BatonRouge,LA70803,UnitedStatesarticleinfoabstractArticlehistory:Mostinterestpointdetectionalgorithmsarehighlysensitivetoilluminationvariations.Thispaperpre-Received12February2008sentsamethodtofindinterestpoints

3、robustlyevenunderlargenon-uniformphotometricchanges.Accepted26November2008Themethod,whichwecallilluminationrobustfeatureextractiontransform(IRFET),determinessalientAvailableonline24December2008interestpointsinanimagebycalculatingandanalyzingcontrastsignatures.A

4、contrastsignatureshowstheresponseofaninterestpointdetectorwithrespecttoasetofcontraststretchingfunctions.TheIRFETKeywords:isgenericandcanbeusedwithmostinterestpointdetectors.Inthispaper,wedemonstratethattheCornerdetectionIRFETimprovestherepeatabilityrateoftheHa

5、rriscornerdetectorsignificantly(byaround25%onaver-Interestpointdetectionageintheexperiments).IlluminationinvarianceHarriscornerdetectorÓ2008ElsevierInc.Allrightsreserved.1.Introductionpoint,bothmagnitudesshouldbelarge.Sincethecalculationofeigenvaluesandeigenvect

6、orsiscostly,acornerstrengthmeasureInterestpointdetectionisanecessarytaskinavarietyofcom-basedonthedeterminantandtraceoftheautocorrelationmatrixputervisionapplications,includingobjectrecognition,tracking,isproposed.Thelocalmaximaofthecornerstrengthmaparecho-ster

7、eoimaging,andmosaicconstruction.Althoughtheterminter-senasthecornerpoints.ThismethodisknownastheHarrisortheestpointdetectorissometimesinterchangeablyusedwiththePlesseycornerdetectorintheliteratureanditisprobablythemosttermcornerdetector;interestpointsdonotneces

8、sarilycorrespondpopularinterestpointdetector.ShiandTomasimethod[3]isbasedtophysicalcornerpoints.TheperformanceofaninterestpointontheHarriscornerdetectorbutusestheminimumofth