通过v4l2实现usb摄像头的数据采集,保存为一张bmp图片-Usb camera v4l2 achieved through data collection, save it as a bmp picture

基于pygtk实现的简单的截图程序，以Screenshot at Y- m- d H: M: S.png的格式保存图片，图片格式为png。-Pygtk based on a simple screenshot program implemented to Screenshot at Y- m- d H: M: S.png format to save the picture, picture format is png.

LCD屏幕截屏测试代码，此工具可以用于对LCD屏幕进行截屏，然后保存为jpe图片。-this test code can cut the picture of lcd，and save to jpeg picture。

抓取 usb摄像头图片，如果是mjpeg模式图片保存为*.mjpg,如果是yuyv模式图片保存为*.yuv,每次运行抓取六张图片。 usb_test只是用来测试的。不同usb摄像头可能会报错。(Grab USB camera pictures, if it is MJPEG mode, save the picture as *.mjpg, if it is yuyv mode, save the picture as *.yuv, each run grab six pictures.)