车牌识别系统设计及MATLAB仿真

郑州工业应用技术学院 本科生毕业设计论文

题 目：指导教师：学生姓名：专 业：院 （系）：

汽车牌照识别系统的设计与仿真 于俊如 职称： 副教授 刘明丽 学号： 1102120202 电气工程及其自动化 机电工程学院 2015年3月27日

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公路车牌识别系统设计及MATLAB仿真

摘 要

近些年，作为智能交通的关键组成部分，车牌识别系统也受到越来越多国家的重视。车牌识别系统不仅能够应用到停车场的管理系统、高速公路的管理系统以及小区车辆管理的系统等一些智能领域，而且对未来国家的安全发展有有重大的意义。

本文在对当前车牌识别系统学习的基础上开发一个基于MATLAB的车牌识别系统。整个测试平台的软件部分利用MATLAB的M语言编写。其中图像处理用到MATLAB灰度图函数rgb2gray、基于Robert算子的函数edge及图像平滑处理函数imclose；图像分割进行了图像膨胀、图像腐蚀；然后用垂直投影法进行字符分割；最后字符经过归一化，进行字符的匹配识别，最终实现了仿真。

关键词：MATLAB；字图像处理；牌识别系统

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Plate License Recognition System Design in Highway and

Matlab Simulat

Abstract

In recent years，as the important part of the intelligent transportation，plate license recognition system has got more attention in more and more countries．The system can not only be application to management system of parking area，management system of highway and district vehicle management system and such as intelligence.

This paper develops a plate license recognition system based on Matlab on my study of the existing license plate recognition system．The software part of the test platform is made by M language of Matlab．And image processing takes use of Greyscale image function rgb2gray，functtion edge based on Roberts operator，iamge Smoothing function imclose．Image segmentation processes image dilation and image erosion；then uses vertical projection achieve character segmentation；at last，character after normalization， matching recognition of the characters，and complete the simulation．

Key words：MATLAB；Digital image processing；Plate recognition system

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目 录

第一章 绪论..................................................................................................................... 1 1.1国内外车牌识别技术现状 ..................................................................................... 1 1.2程研究的目的 ......................................................................................................... 2 1.3MATLAB简介 ......................................................................................................... 2 第二章 设计原理及系统概述......................................................................................... 6 2.1设计原理 ................................................................................................................. 6 2.2系统概述 ................................................................................................................. 6 第三章 高速公路车牌识别系统设计及MATLAB仿真步骤 .................................... 13 3.1图像获取 ............................................................................................................... 13 3.2图像处理 ............................................................................................................... 13 3.3移除小对象 ........................................................................................................... 15 3.4车牌区域的边界值计算 ....................................................................................... 16 3.5字符分割 ............................................................................................................... 16 3.6字符识别 ............................................................................................................... 17 第四章 仿真结果分析................................................................................................... 19 4.1车牌定位、图像读取及其图像处理 ................................................................... 19 4.2车牌字符分割及其图像处理 ............................................................................... 20 4.3车牌字符识别 ....................................................................................................... 20 总 结............................................................................................................................... 22 附 录............................................................................................................................... 23 参考文献......................................................................................................................... 32 致谢................................................................................................................................. 33

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