車牌識別關鍵技術研究及系統(tǒng)實現(xiàn).pdf

1、中山大學碩士學位論文車牌識別關鍵技術研究及系統(tǒng)實現(xiàn)姓名：吳高峰申請學位級別：碩士專業(yè)：光學指導教師：李熙瑩趙福利20100609車牌識別關鍵技術研究及系統(tǒng)實現(xiàn)Title：LicensePlateRecognitionKeyTechniquesResearchandSystemImplementationMajor：OpticsName：ⅥUGaofengSupervisor：LIXiying(associateprofessor)ZHA

2、OFuli(associateprofessor)AbstractLicenseplaterecognitiontechnologyisacomprehensiveonewhichreferstocomputervision，imageprocessing，pattemrecognitionandotherdisciplinesItoutputsthelicenseplateasatextualstring，therebyidentif

3、yingavehicleandpassingitonforfurtherprocessingThistechnologyisanimportantpartofintelligenttransportationsystems，andfindswidespreadapplicationsrangingfromhighwaytollcollection，intervalvelocitymeasurement，intelligentcommun

4、ityparkinglotmanagement，publicsecurityandothersAtypicallicenseplaterecognitionsystemconsistsoffourparts；theyareimageacquisition，licenseplatelocalization，charactersegmentationandcharacterrecognitionThispaperdoesallindepth

5、researchonthelastthreestagesregardingtheapplicationofhighdefinitioncamerasandCanbesummarizedasfollows：1Extractionofthelicenseplatefromthevehicleimage：basedonpredecessorsresearchthisdissertationchoosesSobelverticaloperato

6、rwhichissupposedtohaveagoodeffectonextractingtheverticaledgesofthelicenseplateimageBybringinginactuallicenseplatejumpjudgmentconditionsandadoptingthestrategyofjudgingfromtheroughtothesubtle，thetopandbottominformationofli

7、censeplateCanbefixedThenslidewindowiSutilizedtolocalizetheleftandtherightboundaryofthelicenseplate2Segmentationofcharactersonthelicenseplate：thesystemincorporatesprojectionmethodologyandemployspfiodknowledgeproperlytorou

8、ghlysegmentcharactersMultistagefiltersaredesignedtoreducethedisturbanteofnoisesandbrokenorconglutinatedcharactersAfterthat，preciseborderinformationofcharacterscanbeacquired3Characterrecognition：wefirstextractgridfeatures