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1、InternationalJournalofSignalProcessing,ImageProcessingandPatternRecognitionVol.4,No.2,June,2011Sub-PixelEdgeDetectionUsingPseudoZernikeMomentAmandeepKaur,ChandanSinghDepartmentofComputerScience,PunjabiUniversity,Patiala147001,Indiaaman_k2007@hotmail.
2、com,chandan.csp@gmail.comAbstractMostofthesub-pixeledgedetectionmethodsproposedinliteraturearebasedonGhosalandMehrotra’smethodwhichusesZernikemoments.SomeresearchhasbeenreportedusingFourier-Mellinmomentsforsub-pixeledgedetection.PseudoZernikemomentsh
3、avebeenprovedtobesuperiortoZernikemomentsintermsoftheirfeaturerepresentationcapabilitiesandsensitivitytoimagenoise.ThispaperproposestheuseofPseudoZernikemomentsforsub-pixeledgedetection.Testingoftheproposedalgorithmshowssignificantlybetterresultsthan
4、ZernikeandFourier-Mellinmomentbasedmethodsincaseofimagescorruptedwithadditativeormultiplicativenoise.Keywords:sub-pixeledgedetection,PseudoZernikemoments,outercirclemapping,Fourier-Mellinmoments1.IntroductionAfundamentalstepinanycomputervisionsystemi
5、stofindthekeyfeaturesinanimage.Thefeatureextractionreliesonthedetectionofedges.Conventionaledgedetectorsproduceacompletebutlowprecisionoutlineofthefeaturesinanimage.Theproblemofhigheredgedetectionprecisionisachievedusingsub-pixeledgedetectors.Thereal
6、edgesarecontinuousinnatureandhaveatransitionpartduetodiscretesamplinginthecamera.Theedgesofanobjectrarelyfallonpixelboundaries.Sub-pixellocationaccuracyofedgesisrequiredinmanycriticalapplicationslikemedicalimage,imagemeasurement,remotesensing,andsate
7、lliteimagery.Sub-pixellocationaccuracyishigherthantheimageresolution.Thussub-pixeledgealgorithmsutilizefloatingpointoperationstorealizehigherprecisionedges.Thecommonsub-pixeledgedetectionmethodsfallinthreecategories:reconstructiontechniques,interpola
8、tiontechniquesandmomentbasedtechniques.Thefocusofthispaperisonmomentbasedtechniques.Oneoftheearliestreportedtechniqueinsub-pixeledgedetectionisduetoHueckel[1].Butthistechniquewasdesignedforimplementationoverlargewindowanditscomplexityishigh.Macvicar[
