车辆牌照定位及字符分割研究

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1、哈尔滨工程大学硕士学位论文车辆牌照定位及字符分割研究姓名：宋建华申请学位级别：硕士专业：信号与信息处理指导教师：张磊20081201哈尔滨工程大学硕士学位论文倾斜矫正和字符分割，为后续的字符识别创造了条件。关键词：车牌定位；数学形态学；倾斜矫正；字符分割哈尔滨工程大学硕十学位论文i；；；；；；；；iiiii；；；；；；iii；；i；i；II—IIiiIIIm；；；；iABSTRACTInrecentyears，intelligenttrafficsystemisbecomingincreasinglyimportantwiththeincreaseofroadtrafficaswel

2、lasthedevelopmentofthenationaleconomy．Automaticlicenseplaterecognitionsystem(LPRS)，atechnologywhichcarlbeavidlyappliedtoareassuchastrafficadministrationdepartment，speedway,bridge，electronpolicemanandcustom，etc，isthereforeavitalcomponentinITSandpromisesabrightoutlook．Basedondigitalimageprocessin

3、gtechnology,computervisiontechnologyandpattemrecognitiontechnology,licenseplaterecognitionsystemisdeeplyresearchesandanalyses．Someimprovementsandinnovationonlicenseplatelocation，slantcorrectionoflicenseplateandcharacterssegmentationCanbemadeinthispaper．Inthestageoflicenseplatelocation,allalgori

4、thmoflicenselocationbasedonmathematicalmorphology．Firstofall，analyzingtexturefeaturesoflicenseplateinorderofpriorimageknowledge，andwipingofftheregionofpseudolicenseplatetoUSemathematicalalgorithmsofimagingprocessing，therefore，theaccuratelocationofthelicenseplatewascompleted．Inpracticalapplicati

5、ons，sometimesduetotheshootingangle，distanceandlicenseplateitselfistilted，ere，thereisacertaindegreeofslantafterthelicenseplatelocation,thisisaverybadimpactonaccuratesegmentationofthelicenseplatecharacters．Inthispaper,aalgorithmisadoptedbasedonRadontransform,itisacorrectivealgorithmthroughsearchi

6、ngthestraightlineofrectangularplateandcalculatingtheslantangleofthelicenseplate，thealgorithmrectifytheslantplatethroughmakinguseofthecombinationofedgedetectionofimageandRadontransfo吼，thismethodreceivedagoodresult．Characterssegmentationmeansthataseriesofsinglecharacterimageare哈尔滨：r=程大学硕十学位论文extr

7、actedfromplateregionimages．Therearealotofproblemsondirectuseoftraditionalprojectionofimagestofindtheboundaryofcharacters，inthispaper，allsegmentationalgorithmbasedonprojectionandLicenseplatecharactersrulesWasused．Firstofall，therear