基于v4l2的摄像头驱动，很好的学习驱动知识的入门代码。重点支持sonix系列摄像头。-V4l2 camera-based driver, good learning-driven knowledge entry code. Key support for Sonix series camera.

关键帧检测源代码，可以很好的检测视频中的关键帧-Keyframe detection source code, can be a good test in the video key frame