title: How to use cv::BackgroundSubtractorMOG in OpenCV?
body: <p>I'm using OpenCV2.2 to implement moving objects detection with the method of Background Subtraction. And I use the Gaussian Mixture Model(GMM) method to model the background reference image. </p>
  
  <p>I directly get the foreground pixels(or foreground mask) by using the class cv::BackgroundSubtractorMOG provided in OpenCV2.2. It's convenient but the foreground mask returned by cv::BackgroundSubtractorMOG is not as good as I expected. In addition, it seems that cv::BackgroundSubtractorMOG performs poorer than the method of GMM wrote in C language provided in OpenCV1.0.</p>
  
  <p>The following is my code in OpenCV2.2:</p>
  
  <pre><code>cv::BackgroundSubtractorMOG mog;
  mog(frame, fgMask, 0.01);
  </code></pre>
  
  <p>So, did I use the method in a wrong way? </p>
  
  <p>By the way, does cv::BackgroundSubtractorMOG perform shadow removal on the foreground pixels? </p>
  
  <p>Thank you very much.</p>