deletions | additions       diff --git a/subsection_Body_motion_sensing_of__.tex b/subsection_Body_motion_sensing_of__.tex  index 1503afb..d6eaf10 100644  --- a/subsection_Body_motion_sensing_of__.tex  +++ b/subsection_Body_motion_sensing_of__.tex 
...
\subsection{Body motion sensing of Kinect: Therapy}  In 2010, Microsoft Kinect for Xbox became the most popular device not only for its low cost but also for its simplicity. Kinect allows players to control games through full-body movement without using a remote control \citet{zhang2012microsoft}. When a person faces Kinect, it detects his/her body contour and identifies the position of 20 body joints in a 3D space (x, y, z). As the person moves in front of Kinect, it keeps track of the positions of each joint. These positions are calculated 30 times per second and packaged in a skeleton model called ‘stick model’. Each stick model represents the positions of the 20 joints at a given time, and subsequent stick models, which contain the movements of the joints during a period of time, represent a gesture. Therefore, by using a collection of stick models, third-party applications can process the human body movements and provide natural interaction. \citet{ibanez2014easy}