一种新的车牌倾斜校正方法

车牌的倾斜对车牌的字符分割与识别带来不利的影响.本文分析了车牌的倾斜模式,提出了一种新的车牌倾斜校正方法.该方法采用水平和垂直彩色边缘检测结合旋转投影求取车牌的水平和垂直倾斜角度,对水平倾斜的车牌进行双线性插值旋转校正,对垂直倾斜的车牌进行双线性插值错位偏移校正.实验结果表明,该方法简单实用,对光照、污迹等不敏感,抗干扰能力强.

A Novel Approach for Vehicle License Plate Tilt Correction

Tilt vehicle license plate has a bad effect on its character segmentation and recognition. In this paper, tilt models of a plate are analyzed and a novel approach for number plate tilt correction is presented. Horizontal or vertical incline angle is obtained by combining horizontal or vertical color edge of a plate with its rotation projection. Bilinear interpolation rotation correction is performed to the plate that is tilt to the horizontal line, and bilinear interpolation offset correction is made to the plate that is tilt to the vertical line. Experimental results show that the method can be implemented easily and offers robustness when dealing with dirty number plates and license plates in variant lighting conditions .