1. S.T. Birchfield. Elliptical head tracking using intensity gradients and color histograms. In Proc. Conf. Comp. Vision Pattern Rec., pages 232–237, Santa Barbara, CA, June 1998.
2. M. Black and A. Jepson. Eigentracking: Robust matching and tracking of articulated objects using a view-based representation. Int. J. Computer Vision, 26(1):63–84, 1998.
3. G.R. Bradski. Computer vision face tracking as a component of a perceptual user interface. In Workshop on Applications of Computer Vision, pages 214–219, Princeton, NJ, Oct. 1998.
4. H.T. Chen and T.L. Liu. Trust-region methods for real-time tracking. In Proc. Int. Conf. Computer Vision, pages II: 717–722, Vancouver, Canada, July 2001.
5. D. Comaniciu, V. Ramesh, and P. Meer. Real-time tracking of non-rigid objects using mean shift. In Proc. Conf. Comp. Vision Pattern Rec., pages II:142–149, Hilton Head, SC, June 2000.