西安工程大学学报Issue(4)：404-409,6.DOI:10.13338/j.issn.1674-649x.2015.04.003
基于最小二乘法和Radon变换的车牌校正算法
Algorithm of vehicle license plate correction based on least square method and Radon transform
摘要
Abstract
To locate the license plate character region accurately ,an algorithm least square meth‐od and Radon transform for license plate correction was proposed .Firstly ,the license plate was corrected by using the least square method in horizontal direction .The horizontal tilt angle was got by using feature points to fit characters tilt direction .Secondly ,the horizontal corrected li‐cense plate was corrected by using Radon transform in vertical direction .The license plate im‐age was transformed by Radon transform in every angle in the range of [-30° ,30°] ,and then the vertical shear angle was corresponding to the angle of maximum value of sum of the abso‐lute value of the first-order derivative of transform results .An image set which contains 200 pictures w as tested ,w hich show s that the correction achieves more than 96% ,and its operating efficiency is improved .Results suggest that this method is not only widely applicable ,but also real time .关键词
车牌校正/Hough变换/Radon变换/主成分分析/最小二乘法Key words
vehicle license plate correction/hough transform/radon transform/PCA/least square method分类
信息技术与安全科学引用本文复制引用
陈航,李晓东,李云红,田冀达..基于最小二乘法和Radon变换的车牌校正算法[J].西安工程大学学报,2015,(4):404-409,6.基金项目
西安市科技局技术转移促进工程项目（CXY1431（4））；陕西省教育厅科研计划资助项目（14JK1319）；陕西省科技厅自然科学基础研究计划资助项目（2013JC2-15）；国家级大学生项目（201310709004）；西安工程大学大学生创新创业训练计划项目 （）
