Tracking with the Kinematics of Extremal Contours

  • David Knossow
  • Rémi Ronfard
  • Radu Horaud
  • Frédéric Devernay
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3851)

Abstract

This paper addresses the problem of articulated motion tracking from image sequences. We describe a method that relies on an explicit parameterization of the extremal contours in terms of the joint parameters of an associated kinematic model. The latter allows us to predict the extremal contours from the body-part primitives of an articulated model and to compare them with observed image contours. The error function that measures the discrepancy between observed contours and predicted contours is minimized using an analytical expression of the Jacobian that maps joint velocities onto contour velocities. In practice we model people both by their geometry (truncated elliptical cones) and with their articulated structure – a kinematic model with 40 rotational degrees of freedom. We observe image data gathered with several synchronized cameras. The tracker has been successfully applied to image sequences gathered at 30 frames/second.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • David Knossow
    • 1
  • Rémi Ronfard
    • 1
  • Radu Horaud
    • 1
  • Frédéric Devernay
    • 1
  1. 1.INRIA Rhone-AlpesMontbonnotFrance

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