Additional Reference
A. Amini, S.Tehrani, and T.Weymouth, "Using dynamic
programming for minimizing the energy of active contours in the
presence of hard constraints," in Proc. Second Int. Conf.
Computer Vision, Tarpon Springs, FL, Dec. 1988
S. Geman and D. Geman, "Stochastic relaxation, Gibbs
distribution, and the Bayesian restoration of images," IEEE
Trans. Pattern Anal. Machine Intell., vol. PAMI-6, no. 6, pp.
721-741, Nov. 1984.