奥拓
自动化与电气工程学院 张德
摘要
近几年，车牌识别系统作为智能交通的一个重要方向越来越受到重视。车牌识别系统可以应用于停车场管理系统、智能交通管理系统、小区车辆管理系统等各个领域，对交通管理及治安管理有着十分重要的作用。虽然目前已有一些车牌识别系统相关产品出现，但是对其算法的研究发展从没有停止。
本文首先对车牌识别系统的现有技术进行了更加深入的研究，在研究的基础上开发出一个基于MATLAB 的车牌号识别系统。该设计方案仅进行Matlab软件的开发，图像采用已经采集的车牌号清楚显示的汽车图片，软件包括车牌定位、车牌字符分割及车牌字符识别三个模块。车牌定位模块中使用了基于小波变换的车牌边缘提取的算法，该算法对于各种底的车牌具有良好的适应性；车牌的二值化采用了改进的Otus 算法，重新划分了其两维直方图的区域；字符切割采用波谷检测法，以波谷为切割线，将车牌图片切割成七个字符图片；字符识别采
用模块匹配法，将要识别的字符与预先构造好的字符模板进行比较，根据相似度确定字符。根据上述算法搭建了一个测试平台，通过测试平台，对大量照片进行车牌识别，测试系统的性能。测试结果表明，本课题设计的车牌识别系统可有效地实现车牌识别，为今后的产品化奠定了很好的技术基础。
关键词：车牌识别，车牌定位，字符分割，字符识别
Abstract
In recent years. As an important direction of intelligent traffic management, PRL (Plate Recognition of License System)has been more and more attention. PRL can be applied to the parking management system, the intelligent traffic management system, the vehicle management system and the other areas,.And plays an important role in public security management of transportation management. Although there are some vehicle plate recognition system related products to appear at present, their algorithm's research and development have never stopped.
This paper firstly make a deep research on the existing technologies of PRL. And develop a PRL-system with the software of Matlab. The design just Matlab software .The PRL-system take the existing-picture as the target without the collecting program.The software of PRL-system consist of three modules:The license area locating,license plate character segment,and the recognition of every character.The modules of license area locating use edge detection algorithm based on wavelet transform,which has good adaptability for more quantity of background or license are.The program of take the RGB-picture to binary-picture by Otus,divide the two dimensional histogram of area.Character-cut cutting to the trough for cutting line using trough assay, cutting the area of license plate into seven character.In character recognition, using modular matching method to identify characters with the advanced structural character template carries, Calculate the characroe based on the similarity. According to the above algorithm built a testing platform,with which inspect the property of the PRL-system by a large number of sample picture.Test result shows that this system designed can achieve the license plate identification effectly for future productization laid a good technical foundation.
两厢
KEYWORDS: PRL Area locate Character segment Recognition
1 绪论……………………………………………………………………………………………………………..1
1.1 车牌号识别背景………………………………..……………………………………………….….1
国产车牌子 1.1.1 车牌号识别背景综述………………………….………………………………………1
1.1.2 我国车牌特点………………………………….……………………………………….…2
1.2 车牌号识别研究现状………………………………………..……………………………….…..2
1.2.1 国内外车牌识别技术情况………………………………….……………………...2
1.2.2 车牌识别技术的应用情………………………………………….………………....3
2 系统方案设计……………………………………………..……………….…………. . ……………...4
2.1 车牌号识别系统设计方案概述………………………………….………..…….……….辉腾车标…4
2.2 系统开发环境选择……………………………………………………….....……...............4
2.3 图像读取…………………………………………………….…………..…………………………...4
2.4 车牌区域提取..…………………………………………………………..……….... . ………..…5
2.4.1图像灰度图转化..………………………………………………………………….……厦门限行信息..5
2.4.2图像边缘检测..…………………………………………………………..………………..5
2.4.3灰度图腐蚀..…………………………………………………………..……………………6
2.4.4图像平滑处理..…………………………………………………………..………………..7
2.4.5车牌区域的边界值计算..……………………………………………………………..t158
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