Human Motion Tracking by Registering an Articulated Surface to 3D Points and Normals

Authors:
Radu Horaud;Matti Niskanen;Guillaume Dewaele;Edmond Boyer
Affiliations:
INRIA Grenoble-Rhone-Alpes, Montbonnot Saint-Martin;University of Oulu, Oulu;INRIA Grenoble-Rhone-Alpes, Montbonnot Saint-Martin;INRIA Grenoble-Rhone-Alpes, Montbonnot Saint-Martin
Venue:
IEEE Transactions on Pattern Analysis and Machine Intelligence
Year:
2009

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Abstract

We address the problem of human motion tracking by registering a surface to 3-D data. We propose a method that iteratively computes two things: Maximum likelihood estimates for both the kinematic and free-motion parameters of an articulated object, as well as probabilities that the data are assigned either to an object part, or to an outlier cluster. We introduce a new metric between observed points and normals on one side, and a parameterized surface on the other side, the latter being defined as a blending over a set of ellipsoids. We claim that this metric is well suited when one deals with either visual-hull or visual-shape observations. We illustrate the method by tracking human motions using sparse visual-shape data (3-D surface points and normals) gathered from imperfect silhouettes.