摘要

车辆牌照识别(License Plate Recognition System, LPR)作为目标自动识别的一

种重要形式，可用于电子收费、出入控制、车流监控等众多场合，从而提高交通

管理自动化的程度，它的相关技术的研究正逐渐受到人们的重视。

本文主要介绍基于Run Length原理和Tamura纹理的车牌定位系统，该系统是基

于视频流进行开发的，主要包括车辆运动区域检测、车牌图像处理、车牌定位。

其中车辆运动区域检测利用多帧求平均的背景估计方法实现；车牌图像处理包括

灰度变换、中值滤波、边缘检测和二值化；车牌定位包括车牌水平定位、车牌垂

直定位、颜色判断和细定位。

该定位系统是在C++Builder环境下实现的，针对不同大小车牌、不同光照条件

的1400张图片进行测试，其定位率可以达到92 以上；同时也将该算法封装成DLL

库，应用在雷达测试仪中，对各种光照条件下的视频流进行测试。测试结果证明

本文算法简单、快速、准确率高，满足车牌识别系统实时性、通用性、和准确性

的要求，具有一定的应用价值。

关键词：车牌定位Run Length Tamura纹理-Abstract

As an important application form of target automatic recognition, vehicle license

plate recognition( LPR) technology is used in some fields, such as electron charging,

pass controlling and automobile stream supervising etc.

The paper introduces license plate location system based on the principle of Run

Length and Tamura texture feature. The system is developed based on video streams,

mainly includes vehicle motion region detection, license plate image processing, vehicle

license plate location. The detection of vehicle motion region uses the background

estimation methods based on the average of multi-frame　license plate image processing

includes gray-scale transformation, median filtering, edge detection and binarization

the license plate location includes license plate horizontal location, license plate vertical

position, color judgments and accurate location.

The system is achieved in the C++ Builder environment, and it uses 1400 images

that are of different