基于相位一致性和字符纹理特征的车牌定位算法

吉林大学学报(信息科学版) ›› 2016, Vol. 34 ›› Issue (1): 140-145.

基于相位一致性和字符纹理特征的车牌定位算法

史东承, 丁圆圆, 梁超

长春工业大学计算机科学与工程学院, 长春130012

收稿日期:2014-08-25 出版日期:2016-01-25 发布日期:2016-05-10
作者简介:史东承(1959—), 男, 长春人, 长春工业大学教授, 硕士生导师, 主要从事图像处理研究, (Tel)86-13331777257 (E-mail)dcshi@ mail. ccut. edu. cn。
基金资助:
国家自然基金资助项目(11071026)

License Plate Location Based on Phase Congruency and Character Texture Characteristics

SHI Dongcheng, DING Yuanyuan, LIANG Chao

School of Computer Science & Engineering, Changchun University of Technology, Changchun 130012, China

Received:2014-08-25 Online:2016-01-25 Published:2016-05-10

摘要/Abstract

摘要：

针对在光照变化和光线不足环境下车牌定位困难的问题, 将相位一致性应用于车牌定位, 提出了基于相位一致性和字符纹理特征的车牌检测算法。利用相位一致性不受亮度和对比度变化影响的特点, 提取图像边缘信息; 在获得的图像相位一致性边缘上, 扫描车牌图像。将扫描区域垂直投影为一维信号, 并利用小波多分辨率的特性滤除噪声的干扰, 再根据车牌中的字符纹理的统计量特征进行车牌提取。实验表明, 该算法在光照变化和光线不足的环境下, 能获得96%的车牌识别准确率。

关键词: 相位一致性, 车牌定位, 小波重构

Abstract:

Because of the influence of illumimation changes and insurfficient light, license plate location is much more difficult and has lower accuracy. The phase consistency was used for extracting the image edge information, and character texture was used for extracting the plate area in image. Using vertical projection to get the one-dimensional signal of scanning plate area. The interference of noise is filted out by using the wavelet multi-resolution characteristics. Finally, using statistic characteristics of license plate to extracte it. The simulation results show that the the accuracy of this algorithm can achieve 96% in the illumination and low light environment.

Key words: phase congruency, license plate location, wavelet reconstruction

中图分类号:

TP391. 4

史东承, 丁圆圆, 梁超. 基于相位一致性和字符纹理特征的车牌定位算法[J]. 吉林大学学报(信息科学版), 2016, 34(1): 140-145.

SHI Dongcheng, DING Yuanyuan, LIANG Chao. License Plate Location Based on Phase Congruency and Character Texture Characteristics[J]. Journal of Jilin University(Information Science Ed, 2016, 34(1): 140-145.