Background Subtractor module based on the algorithm given in: Andrew B. Godbehere, Akihiro Matsukawa, Ken Goldberg, “Visual Tracking of Human Visitors under Variable-Lighting Conditions for a Responsive Audio Art Installation”, American Control Conference, Montreal, June 2012.

Gaussian Mixture-based Background/Foreground Segmentation Algorithm. The class implements the following algorithm: "An improved adaptive background mixture model for real-time tracking with shadow detection" P. KadewTraKuPong and R. Bowden, Proc. 2nd European Workshp on Advanced Video-Based Surveillance Systems, 2001." http://personal.ee.surrey.ac.uk/Personal/R.Bowden/publications/avbs01/avbs01.pdf