For the problem of low speed and accuracy of license plate recognition , a new license plate system is designed in this paper . HALCON is used as the core of machine vision and image processing software . The major work includes image acquisition , image preprocessing and the realization of the detection algorithm . Experiments demonstrate that the accuracy of license plate recognition can reach 94.6% during the day . The speed of identification is also improved relatively ,and the average recognition time of each license plate is 40.3 ms .%针对目前车牌识别速度较慢以及识别准确率较低的问题，以 HALCON作为机器视觉和图像处理核心软件，将计算机视觉检测技术应用于车辆牌照的识别，实现了图像采集、预处理和检测．实验结果表明，白天车辆牌照识别准确率达到94.6％；相对于传统方法，识别速度也有所改进，每幅牌照的平均识别时间为40.3 ms ．
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