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汽车牌照定位系统设计与开发论文[带程序].doc

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汽车牌照定位系统设计与开发论文[带程序].doc

编号无锡太湖学院毕业设计(论文)题目汽车牌照定位系统设计与开发信机系计算机科学与技术专业学号学生姓名指导教师(职称副教授)(职称)2013年5月25无锡太湖学院本科毕业设计(论文)诚信承诺书本人郑重声明所呈交的毕业设计(论文)汽车牌照定位系统设计与开发是本人在导师的指导下独立进行研究所取得的成果,其内容除了在毕业设计(论文)中特别加以标注引用,表示致谢的内容外,本毕业设计(论文)不包含任何其他个人、集体已发表或撰写的成果作品。班级计科94学号0921144作者姓名2013年5月25日I摘要车辆牌照识别系统(vehiclelicenseplaterecognitionsystem,简称LPR)是现代智能交通系统中的一项重要研究课题,是实现智能交通的重要环节,涉及领域异常广阔。智能交通系统可以在不影响汽车正常行驶的状态下自动完成对牌照的有效识别,很显然这一技术的发明对于交通管理工作起到了很大的推动作用。目前,车辆牌照识别技术已经广泛应用于高速公路的监测,电子收费,交通违规管理,安全停车管理,偷盗车辆辨别等重要领域。由于牌照拍摄场景的复杂性以及车牌位置和图像质量的不可预知性,车牌定位系统一直都未做到令人满意,所以车牌定位一直是这个领域研究的热点。因此对于汽车牌照识别技术的研究具有重要的现实意义。车牌识别技术主要包括车牌定位和车牌识别两部分,而车牌定位是该系统的关键之一。本文针对车牌识别系统中关于静态图片中的车牌定位问题。在车牌定位系统中,在MATLAB开发平台上,我们分别对图像预处理、图像的边缘检测和分割的若干方法进行编程实验,通过对静态图片进行灰度变换,二值化,中值滤波等一系列处理,提出了基于垂直边缘检测算子的车牌定位方法,根据汽车牌照区域的垂直边缘统计特性,从图像中确定可能存在的牌照候选区,在利用车牌几何形状的特点对这些候选区进行筛选,得到车牌位置,为进一步的字符识别打下基础。关键词车牌定位图像处理边缘检测MATLABIIAbstractThevehiclelicenseplaterecognitionsystemvehiclelicenseplaterecognitionsystem,referredtoasLPRisanimportantresearchsubjectinmodernintelligenttransportationsystem,isanimportantpartofrealizingintelligenttransportation,relatestotheverybroadfiled.Intelligenttransportationsystemscanautocompletestatedoesnotaffectthenormaldrivinglicenseidentification,itisclearthattheinventionofthistechnologyfortrafficmanagementhasplayedasignificantroleinpromoting.Atpresent,thevehiclelicenseplaterecognitiontechnologyhasbeenwidelyusedinhighwaymonitoring,electronictollcollection,trafficviolationmanagement,security,parkingmanagement,vehiclethefttoidentifyimportantareassuchas.Licenseshootingscenecomplexityaswellasthelicenseplatelocationandimagequalityoftheunpredictabilityofthe,licenseplatepositioningsystem,nonehasbeendonesatisfactorily,solicenseplatelocationhasbeenahotresearchofthisarea.Therefore,thevehiclelicenseplaterecognitiontechnologyhasimportantpracticalsignificance.Licenseplaterecognitiontechnologymainlyincludestwopartsofthelicenseplatelocationandlicenseplaterecognition,thelicenseplatelocationisoneofthekeysofthesystem.Inthispaper,thelicenseplatelocationforlicenseplaterecognitionsystemonastaticpicture.Licenseplatepositioningsystem,intheMATLABdevelopmentplatform,weuseimagepreprocessing,imageedgedetectionandsegmentationmethodforprogrammingexperiment,bygrayscaletransformationofthestillpictures,thetwovalues,medianfilteringandaseriesofprocessing,putforwardlicenseplatelocationmethodbasedonverticaledgedetectionoperator,accordingtotheverticaledgesofthestatisticalcharacteristicsofthevehiclelicensearea,identifypossiblelicensecandidatefromtheimage,ontheuseoflicenseplategeometrycharacteristicsofthesecandidatescreening,licenseplatelocation,andlaythefoundationforfurthercharacterrecognition.KeywordsLicenseplatelocationimageprocessingedgedetectionMATLABIII目录摘要..............................................................................................................................................IABSTRACT...................................................................................................................................II目录...........................................................................................................................................III1绪论.............................................................................................................................................11.1本课题的研究背景和意义..................................................................................................11.2国内外的发展概况..............................................................................................................11.3本课题主要研究的内容......................................................................................................21.4我国车牌的特点..................................................................................................................21.5设计的总体思想..................................................................................................................31.6本文各章节内容安排..........................................................................................................31.7开发工具及运行环境..........................................................................................................32基础知识和技术介绍.................................................................................................................42.1基础知识..............................................................................................................................42.2MATLAB简介.....................................................................................................................53车牌定位详细设计.....................................................................................................................93.1图像预处理........................................................................................................................103.1.1车牌的基本特征.........................................................................................................103.1.2彩色图像的灰度化.....................................................................................................103.1.3图像灰度变换.............................................................................................................153.1.4线性变换.....................................................................................................................153.1.5分段线性灰度变换.....................................................................................................163.1.6非线性灰度变换.........................................................................................................173.1.7图像平滑.....................................................................................................................173.2平滑处理............................................................................................................................173.2.1噪声的基本概念.........................................................................................................173.2.2空间域平滑.................................................................................................................183.2.3频率域平滑.................................................................................................................203.3图像边缘检测....................................................................................................................203.3.1引言.............................................................................................................................203.3.2梯度算子.....................................................................................................................203.3.3Roberts算子................................................................................................................213.3.4Prewitt算子.................................................................................................................213.3.5Sobel算子....................................................................................................................223.3.6Canny算子..................................................................................................................233.3.7Laplacian算子.............................................................................................................243.4牌照的定位与分割............................................................................................................253.4.1形态学去噪.................................................................................................................26

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