基于最小字符投影的车牌图像错切校正方法  

Shear correction method of vehicle license plate image based on smallest character projection

作　　者：余婷[1] 管庶安[1] 

机构地区：[1]武汉工业学院计算机与信息工程系,湖北武汉430023

出　　处：《计算机工程与设计》2009年第11期2814-2815,2818,共3页Computer Engineering and Design

基　　金：湖北省自然科学基金项目(2004ABA033);湖北省教育厅科技计划基金项目(202D0101)

摘　　要：为解决车牌图像倾斜对字符分割与识别带来的不利影响,提出一种基于字符投影的车牌图像错切校正方法。对旋转后的车牌字符区域向水平坐标上投影,利用最小投影距离获取水平错切角,采用二维几何变换对图像进行校正。试验结果表明,该方法不依赖车牌边框特征,抗干扰性强,具有较高的鲁棒性。A method to remedy the negative effect arising from slant vehicle license plate＇ s character segmentation and recognition based on character projection is presented. The projection on level coordinate is used on character region of the rotated vehicle license plate, so we use the smallest distance by projection to get the level sheared angle, and then correct the image by two-dimensional transform. The experiment shows that, this method does not depend on the character of vehicle license plate＇ s rim, has good ranti-jamming ability and better robustness.

关 键 词：汽车牌照 错切 字符投影 旋转 校正 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]