大学毕业论文毕业设计范文模板参考资料—数字图像处理应用开发-车牌字符分割系统的设计.doc

摘要 设计题目： 数字图像处理应用开发 ——车牌字符分割系统的设计 摘要 随着社会的发展，车辆将越来越多，为了更好地管理车辆，智能交通系统将是发展的方向，而车牌自动识别系统是智能交通系统中一个重要的环节，它主要包括三个关键技术：车牌区域定位、车牌字符分割和车牌字符识别。本文针对车牌自动识别系统中关键技术之一的车牌字符分割部分做了深入的研究。 首先，要想将车牌图像正确地分割，必须得到质量较好的车牌二值图像，因此本文对车牌字符分割前的预处理进行了较深入研究，尤其是车牌图像二值化后的去噪处理，包括开闭运算、去除边缘、去除圆点等。 其次，在字符分割算法中，给出两种分割算法，一种是固定边界法，另一种是垂直投影法，并对车牌字符进行了分割。实验结果表明，这两种方法可以对车牌字符进行分割，但效果都不是很理想。 然后，在分析了这两种方法的优缺点后，将这两种方法相结合得到改进的投影法，实验表明，该方法可以得到更好的字符分割效果，尤其对在除噪后仍然有少量噪声的车牌也可达到较好的效果。 关键词：字符分割；二值化；预处理；投影法 Abstract Abstract There will be more and more cars with the development of society. Intelligent Transport System will be the direction of development. System of License Plate Automatic Recognition is an important part of the Intelligent Transport System. It is contain of three key technologies: the location of license plate, the division of license plate character and the recognition of license plate character. This paper studied at character recognition technology which is one key technology of the System of License Plate Automatic Recognition. At first, the better quality license plate is needed for properly divide the license plate. So this paper thoroughly studied the pretreatment before the division, especially the wipe of the noise after the binarization including open arithmetic, close arithmetic, wipe of the edge, and wipe of the round spot etc. Secondly, there are two methods to divide the plate. The first is the method of invariable boundary and the other is the method of vertical shadow. At the same time, make the division in the two methods separately. The tests indicate that both of the two methods can make the division, but both of them can not do it well. Finally, combine the two methods and reach the improving method of vertical shadow after analyze merit and demerit of the two methods, The tests indicate that this method make a better division especially to the plate which still have some noise after wiping the noise. Keywords: the division of license plate character；binarization；pretreatment；the