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\subsubsection{The Kinect System}  Human Activity recognition has been an important area of Computer vision research since the 1980s. The past decade has witnessed a rapid development of 3D data acquisition techniques. \cite{aggarwal2014human} Such techniques involve recent advances in 3d depth cameras and motion capture technologies. In the work of \citet{zhang2012microsoft} The Kinect sensor incorporates several advanced sensing hardware. Most notably, it contains a depth sensor, a color camera, and a four-microphone array that provide full-body 3D motion capture, facial recognition, and voice recognition capabilities (see Figure 1). Figure 1b shows the arrangement of the infrared (IR) projector, the color camera, and the IR camera. The depth sensor consists of the IR projector combined with the IR camera, which is a monochrome complementary metal oxide semiconductor (CMOS) sensor. The depth-sensing technology is licensed from the Israeli company PrimeSense (www.primesense.com). Although the exact technology is not disclosed, it is based on the structured light principle.