摘要

摘要步入21世纪后，快速发展的社会经济，带动人们生活水平的不断提高，小车逐渐成为大家日常生活出行的主要工具。对交通管理而言，快速增长的机动车是一个巨大的挑战，自动识别车牌系统不仅有利于人力资源的合理利用还可以很好地提高办事效率，是一个很有发展前景的项目。因此自动识别车牌系统研究应用而生，在最近几年的研究热点占据不可或缺的地位。在本次毕业设计中MATLAB的图像处理技术是重点，项目会在MATLAB软件环境下进行。图像的预处理是项目的第一步，第二步定位出车牌的位置和分割车牌位置，再通过分割字符、识别字符，最后实现字符输出，接着字符输出来控制自动门的开关。车牌感应自动门控制系统设计的技术难点在于如何确定车牌位置、车牌字符分割、字符识别应使用什么算法、自动门的控制和其他各个处理环节的完整结合。关键词：自动识别车牌；图像预处理；车牌定位；字符识别ABSTRACTAfterenteringthe21stcentury,thesocialeconomydevelopmenthasspeededupandpeople'slivingstandardsincreaserapidly,thecarhasbecomethemaintrafficwayofpeople'severydaylife.Howeverthesharpincreaseofmotorvehicleshasbroughthugechallengetoroadtrafficmanagement,Automaticlicenseplaterecognitionsystemcannotonlyreducetheallocationofhumanresourcesbutalsoimprovetheefficiencyeffectively,thefutureforautomaticlicenseplaterecognitionsystemisverypromising.Thereforetheresearchesoftheapplicationofautomaticlicenseplaterecognitionsyst-emwasbornandhasbecomearesearchhotspotinrecentyears.ThisgraduationdesignisbasedonMATLABimageprocessingtechnologyanditwillbecarriedoutintheenvironmentofMATLABsoftware.Thefirststepofthewholedesignisimageprocessing,thesecondstepislocatingthepositionofthelice-nseplateandsegmentthecarplateareafromcarphotos,thensegmentthecharactersandrecognisethecharacters.thelaststepisoutputtheoutcomeofrecognitionresulttocompletethedesign.thekeytechnologyofthissystemaretheautomaticlicenseplatelocation,segmentationoflicenseplatecharacters,thechoiceofcharacterrecogn-itonalgorithmsandthecombinationofeachprocessing.Keywords:Automaticlicenseplaterecognition；Imagepreprocessing;Licenseplatelocation;Characterrecognition湖南科技大学本科生毕业设计（论文）-i-目录第一章绪论.........................................................................................................................................11.1车牌自动识别产生的背景..........................................................................................11.2车牌自动识别国内外发展现状..................................................................................21.3现已存在的车牌自动识别系统产品及应用情况......................................................21.4中国车牌的特征..........................................................................................................31.5车牌自动识别系统开发的意义..................................................................................41.6车牌自动识别系统开发的难点..................................................................................41.7本章小结......................................................................................................................5第二章MATLAB概述及本次设计思路..............................................................................72.1MATLAB的概述.........................................................................................................72.1.1MATLAB的发展...............................................................................................72.1.2MATLAB的特点...............................................................................................82.1.3MATLAB设计车牌自动识别系统的优势.......................................................92.2设计的基本思路..........................................................................................................92.3本章小结....................................................................................................................10第三章系统分析与设计方案....................................................................................................113.1车牌预处理.................................................................................................................113.1.1灰度变换..........................................................................................................113.1.2中值滤波..........................................................................................................123.1.3图像增强..........................................................................................................143.1.4图像的边缘检测..............................................................................................153.1.5区域膨胀与腐蚀..............................................................................................173.1.6开运算与闭运算..............................................................................................183.2牌照定位和分割........................................................................................................203.2.1车牌定位..........................................................................................................203.2.2车牌分割..........................................................................................................213.3字符的识别................................................................................................................223.3.1字符的分割......................................................................................................223.3.2字符的识别......................................................................................................243.4本章小结.......................................................................................错误!未定义书签。第四章设计结果与分析.....................................