通过LABVIEW控制一个USB接口的摄像头拍摄一张图片，同时把ROI调节到图片中需要识别数字字母的区域，自己训练加载特征文件后可识别数字。-LABVIEW control the camera via a USB interface to take a picture, while the ROI adjusted to the picture area needs to recognize alphanumeric own signature file is loaded after tra