中文说明：使用MatLab同时对两个USB摄像头进行预览以及采集，根据摄像头支持的格式与分辨率进行设计就可以使用。 测试如果使用1280X720的分辨率采集两个摄像头的时间需要0.3S。
English Description：
Use MatLab to preview the two USB cameras as well as collecting, according to camera supported formats and resolutions are designed so that they can be used. Test if you use two collection 1280X720 resolution of the camera time to 0.3S.