基于数学形态学和投影法的车牌定位方法  

Vehicle License Plate Location Based on Mathematical Morphology and Projection

作　　者：马永慧[1] 薛丹丹[1] 

机构地区：[1]中北大学电子与计算机科学技术学院,山西太原030051

出　　处：《电视技术》2013年第7期147-149,共3页Video Engineering

基　　金：山西省自然科学基金资助项目(2010011002-2)

摘　　要：在车牌定位系统中,针对图像中存在的复杂背景、车辆自身的车灯或标志这些因素的影响,提出了车牌初步定位和精确定位的方法。首先,对车牌图像进行灰度化、灰度拉伸、边缘检测后,运用数学形态学运算和车牌自身的宽高比例初步定位出车牌区域。然后,运用投影法分别进行水平方向和垂直方向的定位,得到准确的车牌区域。该方法能够很好地排除干扰因素,精确定位出车牌。In the license plate localization system, according to the impact of these factors that the image of complex background, vehicle own lamp or mark, an algorithm about preliminary positioning and precise positioning of vehicle license plate is presented. First of all, after gray level transformation, gray stretching and edge detection of the license plate image, it can use morphological operation and tile proportion of the width and height of the license plate to position the license plate area preliminarily. Then, it uses the projection method to determine horizontal edge and vertical edge based on prelimi- narily positioning image to get the exact license plate area. The method can remove interference factors effectively, so as to achieve the purpose of precise license plate location.

关 键 词：车牌定位 边缘检测 连通区域 水平投影 垂直投影 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]