实现功能：同时采集两路USB摄像头数据，并显示，具有图片保存功能（点击左键保存图片，并暂停视频；右键继续视频）。-The realization of functions: simultaneous acquisition of two USB camera data, and display, has pictures of preserved function ( click the left button to save the image, and the right key to pause the video　video ).