车牌图像识别技术研究

《车牌图像识别技术研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、西南交通大学硕士学位论文车牌图像识别技术研究姓名：刘文申请学位级别：硕士专业：电力系统及其自动化指导教师：金炜东20080401西南交通大学硕士研究生学位论文第lI页AbstractAutomaticrecognitiontechniqueofvehiclelicenseplateliescorepositioninITS(IntelligentT豫瓶cSystem)．whichiSoneofdecidingfactorsthatcontributetoautomaticrunofITS．Amongautomaticvehiclelicenseplaterecognit

2、iontechniques，theonebasedonimagewasacomparatively取Iv趾cedtechnique，andWasalsothemaindirectionofpresentresearchaboutautomaticvehiclelicenseplaterecognitiontechnique．However，techniquebasedonimageinvolvesnumeroussubjectsandlacksguidanceofaunif01"Illtheory,thereweretoomanydisturbingfactorsini

3、mage。thecontradictionbetweenalgorithm’Sreal．timeperformanceandaccuracyWasdifficulttosolve．So，techniquebasedonimageWasalSOthemostdimcult．Inthisthesis，in-depth，comprehensive，systemicanalysisandstudyabouttheresearchstatusquoandachievementofvehiclelicenseplaterecognitiontechniquebasedonimage

4、havebeendone．ARerthat，thisthesispointedoutthepremisetoenhancevehicleimage’Sgrayscalecontrast，pickedoutabinarizingalgorithm(Otsualgorithm)notonlyhasbettereffect，butalsoCanelimilatebackgrounddisturbtoacertainextent，flexiblyappliedSobelalgorithmtoedgedetectingaimingatsuccessivevehicleplatel

5、ocatingalgorithm，improvedtheedgepointdensitymethodandthevehiclelicenseplatelocatingmethodbasedongraysealebreakpoint，pointedoutthelimitationofapplyingHoughtransformtorectifyingslopingvehiclelicenseplateandproposedasimpleandpracticalrectifyingmethod，proposedacharactersegmentingmehodbasedon

6、thetllirdcharacter,used13featureasclassifyingfeatureofalphamericcharacterandextended13featureto22feature，thenuseditforChinesecharacterclassifyingfeature，doneacomprehensivelycontrastiveanalysisaboutpresentrepresentativeneuralnetworks，thenusedBPneuralnetworktoidentifycharacteranddesignedtw

7、oBPneuralnetworkstoidentifytheChinesecharacterandt11ealphamericcharacterrespectively,doneacomparativelyin—depthstudyaboutanalgorithm(i．e．DeterministicPerturbationAlgorithm⋯)usedforBPneuralnetworktrainningandpointedouttheshortageofthisalgorithm，finally,usedBPalgorithmwitll