基于光照补偿和颜色统计的汽车牌照定位方法  

License plate location method based on illumination compensation and color statistics

作　　者：胡之惠[1,2] 孟银阔[1] 

机构地区：[1]上海电机学院电子信息学院,上海200240 [2]华东师范大学信息科学技术学院,上海200241

出　　处：《计算机工程与设计》2013年第10期3568-3573,共6页Computer Engineering and Design

基　　金：上海市教委科技创新基金项目(12AZ05);上海电机学院重点学科基金项目(10XKF01)

摘　　要：基于车牌颜色相对固定,亮度易受光照条件影响的特点,提出一种车牌定位方法。把车辆图像从RGB空间转换到HSV空间,利用同态滤波对亮度分量进行光照补偿,保持色度和饱和度不变;转换回RGB空间,基于颜色统计进行车牌定位。实验结果表明,对于常见的蓝底车牌,该方法不仅能够实现光照不佳、背景复杂车辆的准确车牌定位,而且还能实现包括接近车牌颜色的各色车体的准确车牌定位。Aining at the feature that license plate＇s color is relatively steadfast,but brightness is easily affected by light conditions,a new license plate location method is proposed.Firstly the vehicle image is transformed from RGB space to HSV space.the same hue and saturation are maintained,then illumination compensation of brightness is realized by homomorphic filtering.Finally,the color statistics in RGB space of the license plate is utilized to refine the locating result.As to common blue license,the experimental results show that the proposed method is applicable for vehicles with various colors,including those with color close to that of the plate,in different light conditions.

关 键 词：车牌定位 光照补偿 同态滤波 亮度 颜色统计 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]