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Abstract : |
In this paper we present an algorithm for the estimation of 3D motion and the analysis of facial expressions of a speaking person. To constrain the flexible body motion, a 3D model of the person is used specifying shape, texture and facial motions. The surface of the model is built with triangular Bsplines leading to a small number of control points that determine the appearance of the person. A set of animation parameters characterizes the facial expression. The proposed algorithm estimates changes in the animation parameters between two successive frames using a hierarchical optical flow based method. The computational requirement for this solution is low due to the linear structure of the algorithm. 1., |
