车牌自动识别技术研究

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1、大连海事大学硕士学位论文车牌自动识别技术研究姓名：韦丽华申请学位级别：硕士专业：通信与信息系统指导教师：毕胜20070901英文摘要ResearchonTechnologyofLicensePIateAutomaticRecognitionAbstractThetechnoIo韶oflic髓seplateautomaticrecogIlitionisoneOf也eimponamrcsearchfieldsiIlintell蟾entTraIlsponationSystems(ITS)，Ithasawonderml矗m鹏．LicenseplaterecogIlition(LPR)includes

2、tlll．eeimportanttecllIliquesw11icharemelocationofvehicleliceme，the∞gmenta_tionof也echaractersofthevehiclelicenseandtl忙reco呈面tionoft11echaracterofthevellicle1icense．TherearemaIly、Vaysofrecognizingt11echaractersofVelliclelicense，buttllerecogIlitionofvehicleIiceIlsealwaysisadimcunquestionwllenthectlara

3、ctersareblurred，inclmed，broken，distorted卸dsmuCted．IIltIlispaper’tlle咖dicsarefoc璐edontllealgoritllmsforU’imagepreprocessingandreco鲥tionofchamctersofvehicIeliceIlse．Avectormedi锄filteIingalgoritlllmforcolorimagebaSedondirectionregiondistaIlcemeaSureisproposedintIlepaper．For打aditionalvectormedi锄filtcr，

4、itscompu协tioncostrapidlyincre鹊esandthespeedoftheaIgorit‰isinnuencedwhen恤esizeoft11efil矧I培windowincreases．Inthispaper，directionrc西ondistallcemeasurcisdefinedb雒edontlleregionat廿ibuteofpixels龃dthewindowisdivided啪sub·windows．Andmentllefilteringsub-谢ndowisco蠲姗edbyavemgecolordigtaIlcebetweensub-、Ⅳindowsa

5、Ildthewindow．Finany，mevectormedianfilteringalgorithmisped．omledinttlesub-window．Theexperimentsc枷edoutshowmatnotoIllymoredetailsofcolofimagesarepresenredbutalsot11ecostofcomputationof协ealgorimmisreducedaIlditsspeedisincre∞ed．Anewalgorit№fornumbcrandlettcrcharactcrrecogllitionofVeKclelicenseplateb硒cd

6、on3leVels钯mplatema_tchingisproposed．Firstly，foregroundmatchingmeasureandbackgroundmatchingmeasurcarcusedi11tllefirstlevcltemplatematching．Ifsimilarcharacte陷aregained，characteristicfegiontempIateisusedinthe∞condleveltemplatematching．1ftllefirstlevelmatcllingfails，hollowtempIacesarcappliedinmesecondl

7、eveltemplatenmtching．Ifnlesecondlevelma_蛐ingfails，tllemirdlevelmatchingisthehollowtemplatematchingbasedonHausdorfjfdistance．Thecxperimenta圭rcsultsshowtheefrcctiVenessofthealgorit№．nnotonlyc锄identi母t11esimil