1. Delmas, P., Coulon, P.Y., Fristot, V.: Automatic snakes for robust lip boundaries extraction. In: Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, Civic Plaza, Hyatt Regency - Phoenix, Arizona, March 15-19, vol. 6, pp. 3069–3072 (1999)
2. Liew, A.W.C., Leung, S.H., Lau, W.H.: Lip contour extraction using a deformable model. In: International Conference on Image Processing, Vancouver, BC, Canada, September 10-13, vol. 2, pp. 255–258 (2000)
3. Lievin, M., Delmas, P., Coulon, P.Y., Luthon, F., Fristol, V.: Automatic lip tracking: Bayesian segmentation and active contours in a cooperative scheme. In: IEEE International Conference on Multimedia Computing and Systems, Florence, Italy, June 7-11, vol. 1, pp. 691–696 (1999)
4. Zhang, X., Mersereau, Z.M.: Lip feature extraction towards an automatic speechreading system. In: International Conference on Image Processing, Vancouver, BC, Canada, September 10-13, vol. 3, pp. 226–229 (2000)
5. Eveno, N., Caplier, A., Coulon, P.Y.: New color transformation for lips segmentation. In: IEEE Fourth Workshop on Multimedia Signal Processing, Cannes, France, October 3-5, pp. 3–8 (2001)