title: BackgroundSubtractorMOG sensitivity
body: <p>I'm using a background subtractor which I declared like this:</p>
  
  <pre><code>BackgroundSubtractorMOG subtractor;
  </code></pre>
  
  <p>Now I would like to use the subtractor with non-default paramters. I tried number of paramter value combinations in the following declaration:</p>
  
  <pre><code>BackgroundSubtractorMOG subtractor = BackgroundSubtractorMOG(100, 10, 0.9 20);
  </code></pre>
  
  <p>However, I cannot see any difference in the foreground mask produced by the <code>subtractor</code>, as if the parameters have no effect. </p>
  
  <p>Am I not setting the parameters correctly? What is the correct way to set them?</p>