在linux系统下采用v4l2框架实现对摄像头视频的实时采集，并且在Qt界面上显示，可以运用在linux PC机上，也可以用在嵌入式系统下/-V4l2 linux system used under the fr a mework implementation of real-time collection of video camera, and displayed on the Qt interface can be used in the linux PC machine can also