基于傅里叶描述子在车牌识别中的应用.pdf

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1、机床与液压Dec．2014HydromechatronicsEngineeringVo1．42No．24DOI：10．3969／j．issn．1001-3881．2014．24．019RecognitionoflicenseplabasedonFourierDescriptorsLongCHENG，LingXIONG，Kai—hanLISchoolofInformaticsandEngineering，WuhanUniversityofScienceandTechnology，Wuhan430081，ChinaAbstract：Inordertoreducetheco

2、mpiexityofimagerecognitionandimprovetherecognitionspeedforlicenseplate，thegrayoftheplateimageisadjustedbeforetheimagerecognition．Thebinaryimageoflicenseplateischaracterizedandcontrastedwiththerotatedbinaryimageand，thevariousuncertaintiescouldbeproposedbymeansofFouriertransformalgorithm．

3、ByusingFourierdescriptors．thestandardcharacteristicFourierdescriptorsofIicenseplatecouldbeex．tracted．Thecharactersoflicenseplatecouldberecognizedandpositionedthroughthefeatureextractionandmatchingprocessoflicenseplate．Keywords：Digitalimage，FourierDescriptors，Licenseplaterecognitionforth

4、eassociatedbinaryimageafterthetext，tables，1．Introductionetc．Imageprocessinghasbecomeahotresearch2．Afterobtainingthelicenseplateimagefieldinrecentyears．Ithasbecomeanimportantre—searchdirectiontousecomputerforimageprocessingandrecognition．Inpracticalapplications，recogni—2．1．Binarizingimag

5、etiontechnologyoflicenseplatecouldbeappliedtoForthetransportationapplications，licenseplatepublictransportation，includingpublicroadtollsys—imageisusuallyacolorimage．Colorimagewillnottem，smartparkingandsoon．Duringtheextractiononlyincreasethepressureofthesystem，andalsoprocessofimage，thefur

6、theridentificationandtreat-couldcausealotoftroubleforimagerecognition．mentcouldbeaffectedduetotheexternalinfluenceTherefore，thebinaryimageisrequired[3]．Asim—factorsandinaccuratepositioningplatecharacter．piemethodwhichbasedonthecolorofeachpixelofAdjustmentalgorithmshavebecomeacommontheso

7、urceimageistosetRGBreasonableweightmethodforimageprocessing．However，thecomputa—whenthesumvalueofpixelgrayisbeyondacertaintionalcomplexityofimagedistortionexistsduringthevalue．Theweightsarebasedondifferentvaluesinimplementationprocess．Thefollowingcontentpres—differentprimaryresp