车牌识别系统是现代智能交通系统中的重要组成部分之一，应用十分广泛。它以数字图像处理、模式识别、计算机视觉等技术为基础，对摄像机所拍摄的车辆图像或者视频序列进行分析，得到每一辆汽车唯一的车牌号码，从而完成识别过程。通过一些后续处理手段可以实现交通流量控制指标测量，车辆定位，汽车防盗，高速公路超速自动化监管、闯红灯电子警察、公路收费站等等功能。对于维护交通安全和城市治安，防止交通堵塞，实现交通自动化管理有着现实的意义。
License plate recognition system is an important part of modern intelligent transportation system, which is widely used. Based on digital image processing, pattern recognition, computer vision and other technologies, it analyzes the vehicle image or video sequence captured by the camera, and obtains the unique license plate number of each vehicle, thus completing the recognition process. Through some follow-up processing means, we can achieve the functions of traffic flow control index measurement, vehicle positioning, automobile anti-theft, highway overspeed automatic supervision, red light running electronic police, highway toll station and so on. It has practical significance for maintaining traffic safety and urban security, preventing traffic jams and realizing automatic traffic management.