基于MATLAB车牌识别系统研究.doc

毕业设计[论文]
题目:基于MATLAB车牌识别系统研究
系别: 电气与电子工程系
专业: 电气工程及其自动化
姓名:
学号: 091210247
指导教师: 杨帆
河南城建学院
2012年 05 月 10 日
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、高速公路超速管理系统、城市十字路口的“电子警察”、小区车辆管理系统等各个领域,对国家的安全发展有很大的作用。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,仍有许多学者在做着进一步的研究改进。
本文首先对车牌识别系统的现状和已有的技术进行了深入的研究,在研究的基础上开发出一个基于MATLAB 的车牌识别系统。确定了整体设计方案,其中软件部分包括车牌定位、车牌字符切分及车牌字符识别三个模块。车牌定位模块中提出了基于小波变换的车牌边缘提取的算法,以及车牌二次定位的算法,提高了系统在光照条件较差的情况下的定位准确率,该算法对于各种底色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,改进后的算法大大减少了运行时间,对于各种类型的车牌都能达到较好的二值化效果。
根据上述算法搭建了一个测试平台。整个测试平台的软件部分采用MATLAB 的M 语言编写。通过测试平台,对353 幅卡口汽车照片进行车牌识别,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,小波变换,Otsu 算法,模板匹配, MATLAB
ABSTRACT
In recent years, the development of intelligent transportation has e more and more important. As an important aspect in intelligent transportation, plate license recognition system has taken more and more attention. The plate license recognition system can be applied to public parking, highway speeding management system, crossing road, district vehicle management system, and so on. Although now there are already some exsiting plate lecense recognition systems, the research and development of arithmetic have never stopped, and there are still many scholars who are doing further research and improvement.
Firstly, the paper gives a deep research on the status and technique of the plate license recognition system. On the basis of research, a solution of plate license recognition system is proposed, and the paper focused on the software part. The whole system concludes three modules. They are plate location, plate character segmentation, and plate character recognition. In the plate location module, the paper puts forward an arithmetic of plate edge recognition by wavelet position, and an arithmetic of locating twice, which improve the accuracy in bad light condition, and are fit for plates with different grounding. An improved Otsu arithmetic is used in the process of