车辆自动识别(AVI)是智能交通系统中的一项重要技术。汽车牌照识别是实现车辆自动识别的一种重要的技术手段。而从包含汽车牌照的图像中准确、快速地分割出牌照区域是实现车牌自动识别的一个关键步骤。

本文主要研究了汽车牌照识别中车牌定位问题。车牌定位分为两步进行，首先对车牌进行初定位，对初定位后的车牌图像进行二值化、几何矫正，然后再精确定位车牌区域。同时，在matlab环境下仿真了汽车牌照识别，仿真结果表明，本文算法能很好的识别汽车牌照。

-the Vehicle automatic identification (AVI) is the intelligent transportation system is an important technology. Car licence plate recognition is to realize the automatic recognition of vehicle is a kind of important technical means. And the car licence　contains accurately and rapidly in image segment the licence area is realizing automatic license plate recognition is a key step.

This paper mainly studies the car license plate location in the licence plate recognition. License plate localization is divided into two steps of vehicle license plate, first to early, early after positioning the license plate location binary image, geometric correction, then accurate positioning license plate area. Meanwhile, in matlab simulation the car licence plate recognition, the simulation results show that the algorithm can very good recognition car licence.