The license plate recognition extracts license plate characters through image processing, pattern recognition and statistical analysis,to determine the vehicle identification technology.Through the research of the four key technolo-gy of collecting and processing the image,locating the license plate,separating and identifying the character on the li-cense plate recognition.We offer to process real time license plate image first by converting format, transform into gray and binarization,which is collected by USB camera,and locate license plate by combining with edge extraction and im-age projection. Finally recognize the character information of the license plate based on the method of feature matching, using powerful image processing function of IMAQ on the platform of LabVIEW. The results show that, the license plate image can be well processed by the procedure based on IMAQ, and the average time of discerning the license plate character is about 70ms.%车牌识别是指通过图像处理、模式识别和统计分析等方法从实时车辆图像中提取车牌字符信息，从而确定车辆身份的技术。通过对车牌识别中的图像采集与处理、车牌定位、字符分割和字符识别这4个核心技术的研究，在LabVIEW平台上，利用IMAQ强大的图像处理功能，对USB摄像机获得的实现车牌图像进行格式转换，灰度变换以及二值变换等预处理，将边缘提取与图像投影两种方法相结合精确定位车牌，最后根据特征匹配的方法识别出车牌字符信息。结果表明，基于IMAQ程序可以很好的对车牌图像进行处理，并在平均时间为3s左右情况下完成对车牌字符的识别。
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