基于行扫描和小波变换的车牌定位算法  

LICENSE PLATE LOCALISATION ALGORITHM BASED ON LINE SCANNING METHOD AND WAVELET TRANSFORM

作　　者：刘雄飞[1] 龙巧云[1] 李根[1] 喻格英[1] 

机构地区：[1]中南大学物理与电子学院,湖南长沙410083

出　　处：《计算机应用与软件》2013年第5期279-282,共4页Computer Applications and Software

摘　　要：为了能在复杂背景和不同光照条件下快速、准确地定位车牌位置,提出一种基于行扫描和小波变换的车牌定位算法。该方法首先对车牌图像实行边缘检测、二值化等预处理,在此基础上,利用行扫描法确定车牌的上下边界,对水平区域图像的垂直投影进行小波变换,设定阈值,确定左右边界。实验结果表明,该方法定位速度快、准确率可达到98%,具有很好的鲁棒性。In order to locate license plates rapidly and accurately in complex background and variable conditions of lights,a novel car license plate localisation algorithm based on line scanning and wavelet transform is introduced.In this algorithm,some pre-processing including edge detection and binary image restoration on the image of the license plate is done firstly.Then,up and down boundaries of license plate are decided based on the line scanning method.At the same time,left and right boundaries of license plate can be figured out by wavelet transform conducted on vertical projection of the horizontal area image as well as by setting the threshold.Simulation results show that this plate localisation algorithm has fast localisation speed,high accuracy up to 98% and robustness.

关 键 词：车牌定位 行扫描 投影 小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]