通过手势进行游戏控制的代码，采用C++代码和opencv编写。

SIFT opencv的源码，底层代码编写，有较完整的步骤和每一步的说明，对于sift初学者特别有帮助(Sift source code, the underlying code, there are more complete steps and each step of the descr iption, especially helpful for sift beginners)