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1、基于51单片机的高速公路测速系统和车牌识别分析添加时间: 2010-3-20 11:19:19 文章来源: 文章作者: 点击数:17688摘 要鉴于高速公路限速牌不能很好地对司机起到警示作用的作用，本文设计了一套基于MCS-51单片机，包含光电探测装置和显示装置的电子屏幕。它不仅能方便设置并显示该路段的限制速度，以完成普通电子限速牌的限速提示功能，同时能将测得的车速实时显示，并自动判断是否超速。另外它低廉的造价和经计算证明较高的精度大大提高了它的可用性。车辆牌照自动识别系统是近几年发展起来的基于图像和字符识别术的智能化交通管理系统，是目前国外模式识别应用研究领域的一个热点。本文对系统中区域提取
2、、图像预处理、字符分割和字符识别等环节涉及的算法、设计做了一个比较详细的论述。本文在图像预处理中重点介绍一种在图像获取阶段有目的定位关注的物体，讨论了灰度图像二值化的多种算法，利用它在原始图像形成的标识区域特性,在约束条件下，按照识别牌几何特征提出了一种特殊的二值化处理方法。实验证明该图像识别系统具有较高的可靠性与稳定性,减小了进一步车牌识别中计算量大的问题,从而提高了车牌识别的准确性和快速性。讨论了灰度图像二值化的多种算法基于数学形态学的图像去除噪声的方法。基于数学形态学的图像去除噪声是通过对图像的开、闭操作有选择的去噪声。可以去除直径小于字符笔划半径的孤立噪声点。还详细地介绍了基于字符形态
3、划分的字符识别方法。基于字符形态划分的字符识别方法是在对数字字符结构进行充分分析的基础上，对基元检测，归纳字符形态特征，得到的快速字符识别方法。关键词 ：光电检测；车速测量；单片机；电子限速牌；车辆牌照；图像处理；基元检测；字符识别基于51单片机的高速公路测速系统和车牌识别分析AbstractIn view of the highway speed limit unlicensed drivers should not very well serve as a warning to the role, this article has designed a single-chip based
4、on the MCS-51, including the photoelectric detection devices and display devices of the electronic screen. It not only can easily set up and display the road speed limit in order to achieve common electronic speed limit signs prompt function, can be simultaneously measured real-time display of speed
5、 and automatically determine whether the speeding. In addition it is low cost and the higher the accuracy of calculations greatly enhance its usability.Vehicle License Plate Recognition system is developed in recent years based on the image and character recognition operation of the Intelligent Traf
6、fic Management System, the application of pattern recognition at home and abroad are currently a hot area of research. In this paper, the system of regional extraction, image preprocessing, character segmentation and character recognition algorithm, such as aspect involved in the design to do a more
7、 detailed exposition. In this paper image pre-processing in the introduction of a focus at image acquisition phase has the purpose of positioning objects of concern, discussed the gray image binarization of a variety of algorithms, use it in the original logo image formation of regional characterist
8、ics, in binding conditions, identification card in accordance with the geometric characteristics of a particular binarization approach. Experiments prove that the image recognition system has high reliability and stability, further reduce the vehicle license plate recognition in the calculation of a
9、 large quantity of questions, thereby increasing the accuracy of license plate recognition and speed.Discussed the gray image binarization algorithm of multiple images based on mathematical morphology method to remove noise. Images based on mathematical morphology to remove the image noise is throug
10、h the open and close operation has chosen to noise. Can remove the character strokes of a diameter less than the radius of the isolated noise points. Also detail the division of character-based form of character recognition methods. Morphological character-based division of Character Recognition on
11、the figure are at a full analysis of character structure based on element detection, morphological characteristics summarized characters get Character Recognition Express.Key words： Photoelectric detection; speed measurement; Singlechip; electron speed licensing; vehicle license; image processing; m
12、otif detection; Character Recognition目 录摘 要. IAbstract. II第1章 绪 论. 21.1 车牌字符识别研究课题的背景. 21.2 车牌字符识别研究的意义. 21.3 车牌字符识别研究的应用现状及发展. 31.4 本文主要容. 4第2章 车牌图像预处理. 52.1 数字图像处理的相关介绍. 52.1.1 数字图像处理概念. 52.1.2 图像的数字化表示. 52.1.3 本文中图像处理所涉及的相关领域. 62.2 图像二值化. 62.2.1 彩色图像和灰度图像. 62.2.2 基于灰度的图像二值化. 72.2.3 图像二值化结果演示. 92.3 用数学形态学的方法去除噪声. 102.3.1 数学形态学的几种基本运算. 102.3.2 经开闭运算前后的图像对比显示.
