一种新的汽车牌照快速定位方法

28420074MICROCOMPUIERAPPLICATIONSVol.28No.4Apr.2007(710072):,,;,;,:ANovelFastMethodforLocatingLicensePlateofVehicleZHOUTieping,WANGQing(SchoolofComputerScience,NorthwesternPolytechnicalUniversity,Xipan,710072,China)Abstract:Anovelmethodforlocatingcarlicenseplateusingthetexturefeature,whichisstableandrecognizable,isproposedFirstly,thereal2timecapturedimageisroughlyprocessedtoobtainanumberofcandidatesbasedonthecoarsetexturecharacteristicu2singahigh2passenergyfilter.Thenweextractthewavelettextureofthecandidateareasandobtainthecarlicenselocationusingthemathematicalmorphologyandprojectionmethod.Finally,thecolorinformationinHSVspaceandtextureuniformityofthelicenseplateisutilizedtorefinethelocatingresult,whichishelpfulforsuccedentcharactersegmentationTheexperimentalresultsshowthattheproposedmethodisquiteeffectiveandrapidlyKeywords:Licenseplatelocalization,Textureanalysis,Waveletanalysis,Mathematicalmorphology1,,(IntelligentTransportationSystem)[111][12][4],,:[1];[2,3];[4,5,6];Hough[7,8];[9];[10],,,2,,,;,,©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1),,P(x,y):P(x,y)=2I(x,y)-I(x-1,y)-I(x+1,y)(1)(1),Ix,y(x,y)[11]:E=xyP(x,y)2(2);;,(),(MN)MNnn,,Ei,j=i+1n-1x=inj+1n-1y=jnPx,y2(3)(2),0iM,0jN,M=Mn,N=Nn1©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,;,;,;()(1),,,(1,)3,,,,3.1,(DWT),Mallat,2,2cAj4,cAj+1cDhJ+1cDvJ+1cDdJ+1cDvJ+1:,(,),(,)3.2,,,,,,,:,,,,,;,,,©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:(1):,Harr,;(2):,,,;(3):(,,)(11),,(4):,,,,3.4(3(A),(B),(C),3),3(A1)(C4),,,3(A5)1,,,,,4,,(),,,3A5,,:(1),A0(2)HSVHSIŠHA0…SA0€IA0,(3),E(x,y)(n,2,),…EA0(4),AB,:ŠHAB…SAB€IAB…EAB:Sc=1-ŠHAB-ŠHA0-…SAB-…SA0-€IAB-€IA0(4)St=1-1-…EAB…EA0(5)Sc,Sttctt,ABA0SctcSttt,ABA0,AB(tc0.7,tt'1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)(5),,44©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(),(),,,,1,..,2002,7(5):4724752,..,2003,8(5):2812853,..,2000,5(5):4114154,..,1998,32(10):495,..,2001,6(4):3743776,..,2001,21(4):75767,..,1999,25(9):61628VKAMAT,SGANESAN.AnefficientimplementationoftheHoughtransformfordetectingvehiclelicenseplatesusingDSPpS.USA:IEEEProceedingofReal2TimeTechnologyandApplicationsSymposium,CA,ComputerSocietyPress1995,58599,,..,2000,17(5):333610S.H.Park,K.I.Kim,K.JungandH.J.Kim,LocatingcarlicenseplatesusingneuralnetworksELECTRONICSLETTERS,1999,35(17)1475147711,,..,2003,14(5):52352512..,2005,26(3):339341©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.