基于轮廓波的夜间逆光条件下的车牌定位方法

针对夜间逆光条件下车牌号识别中的车牌定位问题,给出了一种基于非下采样轮廓波和数学形态学的车牌定位方法,并提出利用车灯与车牌几何位置关系,通过定位车灯缩小车牌搜索范围,提高了车牌定位精度。测试表明,给出的车牌定位方法具有实用性。

Licence Plate Location Based on Nonsubsampled Contourlet Transform

In this paper,a method of licence plate location from the backliglighting image in the nignt is presented,based on the nonsubsampled contourlet transform（NSCT） and mathematical morphology.Inorder to improve the accuracy of license plate location,narrow the search area of the licence plate by locating the lamps,on the basis of the geometric relationships between the licence plate and the lamps.The test shows that it is practical that the license plate location method is presented in this paper.