title: Please explain what is the use of kalman filter in this tutorial
body: <p>A guy posted <a href="http://www.mathworks.com/matlabcentral/fileexchange/14243-2d-target-tracking-using-kalman-filter" rel="nofollow">this tutorial</a> about object tracking using Kalman filter. Many people rated high star so it is not a fault/wrong tutorial.</p>
  
  <p>However, a guys posted the following question:"
  In this code you have done detection in every frame and this output is provided as the input to the kalman filter.So background subtraction and kalman filter will give similar results.So please can you explain the use of kalman filter here. "</p>
  
  <p>I have the same thought with him.
  Can anybody explain the use of Kalman filter here? </p>