摘要本次毕业设计采用数字图像处理技术，使用Matlab软件进行程序编写实现车牌区域的定位、车牌字符分割及车牌字符识别，重点是车牌区域的定位算法研究及实现。
本车牌识别系统主要由图像预处理、车牌区域定位、字符分割及字符识别四个部分组成。其中预处理包括了对图像的灰度化、图像增强以及图像的二值化，接着采用Canny算子进行边缘检测，并对边缘检测提取的图像进行开、闭运算进行滤波；车牌区域定位主要是通过对连通区域的高宽比范围进行设定来确定车牌区域；字符分割部分主要包括车牌角度的矫正和利用水平投影与垂直投影去掉车牌边框，然后根据字符的高度与宽度实现字符的分割；字符识别部分主要是基于模板匹配识别车牌字符。9749
本文对车牌定位系统的设计原理、流程作出了详细的分析说明，并对系统的不足之处进行了说明。
关键词 车牌定位 边缘检测 字符分割 字符识别
毕业设计说明书（论文）外文摘要
Title The Research and Implementation of License Plate Location
Abstract
The graduate design use the digital image processing technology and Matlab software programming to achieve the positioning of the plate area, plate character segmentation and the license plate character recognition, with emphasis on the reserch and implementation of the license plate location algorithm.
The license plate recognition system consists of image preprocessing, the positioning of the plate area, character segmentation and character recognition, which preprocessing including image intensity, image enhancement and image binarization, then by using the Canny operator to detect edge ,and use open and closing operation to filter the extracted image; plate region positioning is mainly carried out through the connected region height to width ratio range of settings to determine the license plate area; section of character segmentation, including the license plate angle correction and use of horizontal projection and vertical projection to remove the license plate border, then the character segmentation is based on the height and width of the characters; the character recognition part is mainly based on template matching to identify the license plate characters.
This article has made a detailed analysis of the license plate positioning system design principles, processes, and the inadequacies of the system has been described.
Keywords License Plate Location Edge Detection Character Segmentation Character Recognition
目 次
1 绪论 1
1.1 课题背景 1
1.2 车牌定位技术的现状 1
1.3 本论文主要内容 3
2 车牌识别算法简介 4
2.1 图像预处理 4
2.2 车牌的定位 6
2.3 基于模板匹配的字符识别 7
3 车牌定位识别系统的组成 7
3.1 系统的实现功能 7
3.2 系统的功能模块 7
3.3 应用软件 8
4 程序设计及实现 8
4.1 图像预处理 8
4.2 车牌区域定位 11
4.3 车牌图像中字符的分割 16
4.4 字符识别 19
4.5 实验结果 21 Matlab车牌定位技术研究与实现:http://www.youerw.com/zidonghua/lunwen_8562.html