基于MATLAB的车牌图像处理

基于MATLAB的车牌图像处理(论文12000字)
摘要:汽车牌照自动识别系统是最近几年发展起来的计算机视觉以及模式识别技术在智能交通领域应用的重要课题之一，也是现代智能交通管理的重要组成部分之一。车牌识别系统使车辆的管理更智能化、数字化，使交通管理更加方便和有效。车牌识别系统主要包含了图象采集、图象预处理、车牌定位、字符切割、字符识别等五个重要的组成部分。在车牌自动识别系统中，首先要将车牌从所获得的图象中切割出来，这是实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实行深入的研究，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，对各种车辆图象处理方法实行分析、比较，提出了车牌预处理、车牌粗定位精定位的方法。本次设计采取的是基于边缘检测，先从经过边缘索取后的车辆图象中索取车牌特征，实行分析处理，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象实行处理，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：车牌自动识别系统 车牌定位 MATLAB

License plate image processing based on MATLAB
Abstract:Auto license plate recognition system is one of the important topics of the application of computer vision and pattern recognition technology in the field of intelligent traffic in recent years. It is also one of the important parts of modern intelligent traffic management. License plate recognition system makes the management of vehicles more intelligent and digitalized, making traffic management more convenient and effective. The license plate recognition system mainly includes five important parts: image acquisition, image pre-processing, license plate location, character segmentation, character recognition and so on. In the automatic recognition system of the license plate, the first step is to divide the license plate from the image obtained, which is an important step in the recognition of the license plate character, and the accuracy of the location directly affects the recognition rate of the license plate. This graduation design first studied the status of the license plate recognition system and the existing technology. On the basis of the research, we developed a license plate recognition system based on MATLAB. Through the compilation of M files, the analysis and comparison of various vehicle image processing methods were carried out, and the license plate preprocessing and the license plate rough positioning were put forward. The method of position. This design is based on the edge detection. First, the license plate features are obtained from the vehicle image after the edge, and the area of the license plate is preliminarily determined. Then the two value image of the license plate area is processed by using the prior knowledge and distribution features of the license plate, and the precise area of the license plate is obtained. And the better positioning results are obtained.
Keywords:license plate recognition， system license plate location，MATLAB

目录
1、绪论    5
1.1课题研究背景及意义    5
1.2 国内外研究状况    5
2、车牌识别系统原理概述    6
3、各版块的实现    7
3.1图象获取    7
3.2图象预处理及边缘提取    8
3.2.1图象灰度化    9
3.2.2边缘检测    10
3.2.3 Canny边缘检测算法    11
3.2.4图象的腐蚀    11
3.2.5形态学滤波    13
3.3车牌定位    14
3.3.1牌照区域的定位和切割     15
3.3.2车牌进一步处理     17
3.3.3灰度图象二值化     19
3.3.4车牌提取     20
3.4字符切割     21
3.4.1车牌分割    21
3.4.2字符归一化     21
3.5字符的识别     22
4、设计结果与分析    23
5、总结与展望    23
参考文献    25
致谢    26