基于MATLAB的车牌识别毕业设计

1基于MATLAB的车牌识别研究摘要汽车牌照自动识别系统是近几年发展起来的计算机视觉和模式识别技术在智能交通领域应用的重要研究课题之一。在车牌自动识别系统中，首先要将车牌从所获得的图像中分割出来，这是进行车牌字符识别的重要步骤，定位准确与否直接影响车牌识别率。本次毕业设计首先对车牌识别系统的现状和已有的技术进行深入的研究，在研究的基础上开发出一个基于MATLAB的车牌识别系统，通过编写M文件，对各种车辆图像处理方法进行分析、比较，提出了车牌预处理、车牌粗定位何静定位的方法。本次设计采取的是基于边缘检测，先从经过边缘提取后的车辆图像中提取车牌特征，进行分析处理，从而初步定出车牌的区域，再利用车牌的先验知识和分布特征对车牌区域二值化图像进行处理，从而得到车牌的精确区域，并且取得了较好的定位结果。关键词：识别率车牌定位二值化边缘检测2AbstractThesubjectoftheautomaticrecognitionofthemostsignificantsubiectsthatareimprovedfromtheconnectionofcomputervisionandpattrenrecognition.InLPSR,thefirststepisforlocatingthelicenseplateinthecapturedimagewhichisveryimportantforcharacterrecognition.Therecognitioncorrectionrateoflicenseplateisgovermentbyaccuratedegreeoflicenseplatelocation.Thegraduationprojectfirstin-depthstudyonthestatusofthelicenseplaterecognitionsystemsandexistingtechnology,onthebasisofthestudydevelopedamatlab-basedlicenseplaterecognitionsystem,avarietyofvehicles,imageprocessing,throughthepreparationoftheM-fileanalysisoftheproposedlicenseplatepretreatment,thepositioningofthecoarselicenseplatepositioningJing.Thedesignistakenbasedonedgedetection,starttoextractthelicenseplatecharacteristicsafterthevehicleimageedgeextraction,analysisandprocessing,whichinitiallyidentifiedthelicenseplatearea,thenusethepriorknowledgeanddistributioncharacteristicsofthelicenseplateplateregionbinaryimageprocessing,resultinginapreciseareaofthelicenseplate,andhasmadegoodpositioningresults.Keywords:RecognitionrateLocationoftheplatebinaryimageCheckedupfortheedge3目录摘要...................................................................................................................................................1前言...................................................................................................................................................4第一章绪论.....................................................................................................................................51.1、课题研究背景和意义......................................................................................................51.2、国内外研究概况及发展趋势..........................................................................................61.3车牌定位的意义.................................................................................................................7第二章MATLAB简介...................................................................................................................82.1.MATLAB发展历史...........................................................................................................82.2MATLAB的语言特点........................................................................................................9第三章车牌定位...........................................................................................................................113.1车牌定位的主要方法......................................................................................................113.1.1基于直线检测的方法...........................................................................................113.1.2基于阈值化方法...................................................................................................123.1.3基于灰度边缘检测方法.......................................................................................123.1.4基于彩色图像的车牌定位方法...........................................................................133.2研究内容及实验方案.......................................................................................................143.2.1研究内容................................................................................................................143.2.2车牌识别系统研究的方案和方法.......................................................................143.3图像的读取......................................................................................................................153.4预处理及边缘提取..........................................................................................................173.4.1图象的采集与转换...............................................................................................173.4.2图像预处理...........................................................................................................173.4.3图像增强...............................................................................................................183.4.4灰度变换................................................................................................................183.4.5图象平滑的介绍...................................................................................................203.4.6边缘检测................................................................................................................213.4.7图像的腐蚀............................................................................................................223.5牌照的定位和分割..........................................................................................................233.5.1牌照区域的定位和分割.......................................................................................243.5.2牌照区域的分割.............................................