一个完整的车牌识别系统闭应包括车辆检测、图像采集、图像预处理、车牌定位、字符分割、字符识别等单元。当车辆到达触发图像采集单元时，系统采集当前的视频图像。车辆识别单元对图像进行处理，定位出牌照位置，再将车牌中的字符分割出来进行识别，然后组成车牌号码输出。(A complete license plate recognition system should include vehicle detection, image acquisition, image preprocessing, license plate location, character segmentation, character recognition and other units. When the vehicle reaches the trigger image acquisition unit, the system collects the current video image. The vehicle recognition unit processes the image, locates the license plate position, and then separates the characters in the license plate for recognition, and then forms the license plate number output.)