title: Detecting jump gesture with Kinect [Algo]
body: <p>I am trying to implement jump as well as ducking gestures of a user, and I am using Kinect for skeleton tracking and extracting the joint positions. I previously implemented a rudimentary algorithm taking the history of past 10 values of a joint and checking if the joint moved upward/downward greater than a threshold to deduce a jump/duck.</p>
  
  <p>However, that doesn't seem to be the correct approach since the user:<br/>
  - might duck a little before jumping<br/>
  - when user jumps, also comes down and a duck is deduced.<br/>
  - when the user ducks, also comes up, a jump is deduced<br/>
  - the user when ducking might stay longer in air than when he ducks or sits down.<br/></p>
  
  <p>What would be an appropriate algorithm to detect both of these jump/duck gestures in a robust manner with Kinect joints being retrieved instantaneously?</p>