1. Haritaoglu, I., Harwood, D., Davis, L.S.: W4: Who? When? Where? What?A real-time system for detecting and tracking people. In: Proc. 3rd Face and Gesture Recognition Conf., pp. 222–227 (1998)
2. Toyama, K., Krumm, J., Brumitt, B., Meyers, B.: Wallflower: principles and practice of background maintenance. In: Proc. Int. Conf. Computer Vision, pp. 255–261 (1999)
3. Wren, C., Azabayejani, A., Darrell, T., Pentland, A.: Pfinder: Real-time tracking of the human body. IEEE Trans. Pattern Analysis Machine Intelligence 19, 780–785 (1997)
4. Stauffer, C., Grimson, W.E.L.: Adaptive background mixture models for real-time tracking. Computer Vision and Pattern Recognition 2, 246–252 (1999)
5. François, A.R.J., Medioni, G.G.: Adaptive color background modeling for real-time segmentation of video streams. In: Proc. Int. Conf. Imaging Science, Systems, and Technology, pp. 227–232 (1999)