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1毕业设计（论文）课题名称多路径识别算法的研究院别：电气工程学院专业：电子信息工程2摘要随着各省市高速公路的不断建设，基本上建成了大小规模不等的联网收费系统，在联网收费系统建设中，都面临了一个共同的问题——车辆行驶路径的识别。路径识别不仅仅涉及对每一通行车辆如何计算通行费，同时还要考虑将收入的通行费拆分给哪个收费单位的问题，通行费的拆分直接关系到各条高速公路的合法利益，是联网收费的关键。所以说解决多路径识别问题在完善高速公路联网收费系统中起着至关重要的作用。本文介绍了多路径识别的多种算法，并着重分析了识别算法中的汽车牌照识别，根据车牌图像特点，对车牌识别算法关键环节包括数字图像预处理，车牌定位，车牌字符识别等三部分一一进行了分析研究。本文采用直方图变换、边缘检测、二值化等方法对车牌图像进行了预处理。对车牌定位采用了一种基于灰度图像求取卷积能量极值区域的车牌定位方法。采用模板匹配法对车牌字符进行识别。并采用了MATLAB来完成算法的设计与实现。研究结果表明车牌识别率较高，适应性较强，实时性比较好。关键词：多路径识别；车牌识别；车牌定位；模板匹配；字符识别3ABSTRACTAsexpresswayconstructionunceasinglyinprovinces,numbersofonlinechargingsystemswascompletedbascially.Intheconstructionofonlinechargingsystem,wearefacingacommonproblem—Theidentificationofvehiclepath.Pathrecognitioninvolvesnotonlyhowtocalculatethetollstoeveryvehicle,alsoshouldconsiderhowtosplittheincomestorelevantchargingunit.Tollsplitisdirectlyrelatedtothelegitimatebenifitofeveryexpressway,andisthekeytonetworkingtoll.Sosolvingtheproblemofmultipathrecognitionplaysanimportantroleinperfectingtheexpresswaynetworkingtollsystem.Thisarticleintroducesthemultipathrecognitionalgorithms,Andemphaticallyanalysedtherecognitionalgorithmoflicenseplaterecognition.Basedonimagecharactersoflicenseplate,wehaveadeeplyresearchonthekeytechnologiesofthevehiclelicenseplaterecognitionsystem,whichincludethreeparts:digitalimagepre-processing,licenseplatelocation,licenseplatecharactersrecognition.Inthevehicleimagespre-procession,thepaperusethemethodsofHistogramTransformation,Edgedetection,binarization.Forlicenseplatelocalizationusingakindofcalculatingconvolutionbasedongrayimageenergyextremumregionoflicenseplatelocatingmethod.Thepaperusepatternmatchingwhichmethodhasbeenimprovedtorecognizethecharacters.AndusingMATLABtocompletethedesignandimplementationofthealgorithm.Researchresultsshowthatthelicenseplaterecognitionrateishigher,adaptabilityisstronger,betterreal-timeperformance.KeyWords:Multipathrecognition;Licenseplateidentification;licenseplatelocation;templatematching;OCR4目录第1章绪论......................................................................................................................11.1研究背景和意义.........................................................................................................11.2MATLAB的概述........................................................................................................11.3本文框架结构.............................................................................................................4第2章国内外研究现状..............................................................................................52.1国外研究现状.............................................................................................................52.2国内研究现状.............................................................................................................6第3章多路径识别算法的基本理论.......................................................................83.1多路径识别方法的分类.............................................................................................83.1.1精确识别...................................................................................................................83.1.2概率识别...............................................................................................................93.2多路径识别算法的理论基础......................................................................................93.2.1车牌照识别的主要算法......................................................................................93.2.2本文采用的识别算法.........................................................................................12第4章基于模板匹配的车牌识别详细设计.....................................................154.1图像采集....................................................................................................................154.2图像预处理................................................................................................................154.3车牌定位....................................................................................................................174.4倾斜校正....................................................................................................................184.5字符分割....................................................................................................................194.6字符识别....................................................................................................................204.6.1字符识别流程概述.............................................................................................204.6.2本文字符识别流程.............................................................................................22第5章车牌识别系统在MATLAB工具下的实现..........................................285.1实验环境....................................................................................................................285.2平台搭建....................................................................................................................285.3识别过程....................................................................................................................