说明：  如果大家有用过kinect做开发，不管是使用kinect SDK还是使用OpenNI，估计都对这些库提供的人体骨骼跟踪技术有一定的好奇，心里在想，每个人穿的衣服不同，身体特点也不同，所处的环境不同，且走路或做手势时的姿势也不相同，竟然能够跟踪人体的骨架，且效果不错。那么上面的Kinect SDK和OpenNI提供给kinect开发的核心算法——人体骨架跟踪到底是怎么实现的呢？
(If everyone used kinect development to do, whether it is using the the kinect SDK or use OpenNI These libraries provide the human skeleton tracking technology curiosity and thought to myself, everyone wearing different clothes, different physical characteristics, the at the different environments, and is not the same posture when walking or gesturing, and even be able to track the skeleton of the human body, and the effect is good. Above Kinect SDK and the OpenNI provided to the core algorithm kinect developed- human skeleton track in the end is how to achieve it?)