嵌入式Linux下USB摄像头驱动程序的开发-USBcamera

通过V4L2进行图像采集，使用QT的Qwidget作为界面显示采集到的图像，是linux下视频开发的经典代码-it captures the image through the V4L2 and use the Qwidget of QT as the GUI to show the image form the usbcamera。

usbcamera是基于V4L2协议的对USB接口摄像头的JNI控制代码,android应用可以直接调用它以实现对usb camera的控制.-usbcamera is used to control usb-if camera,based on V4L2 protocol,and is used to operate the camera under the android platform.

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.)