v4l的测试程序，可以用来获取usb摄像头的一帧图像，格式为*.raw，可以用ps等工具查看。该程序的编译工具为gcc。-A v4l test program. You can use it to catch one fr a me picture of the usb camera. The picture format is*.raw, can be viewed with PS, etc. Please compile it with gcc.