9Berthold K.P. Horn,Brian G. Schunck.Determining optical flow[].Artificial Intelligence.1981
10Haritaoglu I,Harwood D,Davis L S.Real-time surveillance of people and their activities. IEEE Transactions on Pattern Analysis and Machine Intelligence . 2000
7Friedman N, Russell S. Image segmentation in video sequences: a probabilistic approach. In: Proceedings of the 13th Conference on Uncertainty in Artificial Intelligence. Providence, USA: Morgan Kaufmann, 1997. 175-181
8Stauffer C, Grimson W E L. Learning patterns of activity using real-time tracking. IEEE Transactions on Pattern AnaJysis and Machine Intelligence, 2000, 22(8): 747-757
9Kaewtrakulpong P, Bowden R. An improved adaptive back- ground mixture model for real-time tracking with shadow detection. In: Proceedings of the 2nd European Workshop on Advanced Video Based Surveillance Systems. Providence, USA: Kluwer Academic Publishers, 2001. 1-5
10Zivkovic Z, van der Heijden F. Efficient adaptive density estimation per image pixel for the task of background subtraction. Pattern Recognition Letters, 2006, 27(7): 773-780