基于变步长的旋转投影变换法  

Rotating Projection Transformation Method Based on Variable Step

作　　者：方承志[1] 申继龙 周品[1] 冯迪[1] 

机构地区：[1]南京邮电大学电子科学与工程学院,江苏南京210003

出　　处：《计算机技术与发展》2013年第9期107-109,118,共4页Computer Technology and Development

基　　金：国家自然科学基金资助项目(60772060)

摘　　要：车牌识别系统是智能交通的重要组成部分,在日益凸显的道路交通问题上发挥着举足轻重的作用。车牌的倾斜校正是字符分割和字符识别正确与否的一个重要因素。旋转投影变换法能够很好地解决车牌倾斜的问题,但是对一个特定范围内的所有角度进行此变换,增加了计算所需要的时间。为了降低算法所需要的时间,文中结合旋转投影变换法,在此基础上根据旋转后投影的直方图必有一个峰值的特点,提出了变步长的旋转投影变换方法。仿真表明,在相同的情况下,改进的算法的运行时间得到改善。The license plate recognition system is important part in intelligent transportation, which plays an crucial role for road transpor- tation problem concerned. The license plate tilt is an important factor of character segmentation and recognition. The rotating projection transformation is an effective way to solve the problem,but it will cost much time to calculate for transformating in every angle within a specified range. A rotating projection transformation based on variable step is presented for the following reasons. There is a peak on the rotated pl＇ojection histogram that generated by the rotating projection transform. The new method would reduce the time needed by the al- gorithm. The simulation results show that,in the same case, the improved algorithm running time is improved.

关 键 词：旋转投影变换法 车牌倾斜校正 变步长 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]