Data-Driven Manifolds for Outdoor Motion Capture

  • Gerard Pons-Moll
  • Laura Leal-Taixé
  • Juergen Gall
  • Bodo Rosenhahn
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7474)

Abstract

Human motion capturing (HMC) from multiview image sequences is an extremely difficult problem due to depth and orientation ambiguities and the high dimensionality of the state space. In this paper, we introduce a novel hybrid HMC system that combines video input with sparse inertial sensor input. Employing an annealing particle-based optimization scheme, our idea is to use orientation cues derived from the inertial input to sample particles from the manifold of valid poses. Then, visual cues derived from the video input are used to weight these particles and to iteratively derive the final pose. As our main contribution, we propose an efficient sampling procedure where the particles are derived analytically using inverse kinematics on the orientation cues. Additionally, we introduce a novel sensor noise model to account for uncertainties based on the von Mises-Fisher distribution. Doing so, orientation constraints are naturally fulfilled and the number of needed particles can be kept very small. More generally, our method can be used to sample poses that fulfill arbitrary orientation or positional kinematic constraints. In the experiments, we show that our system can track even highly dynamic motions in an outdoor environment with changing illumination, background clutter, and shadows.

Keywords

Manifold Covariance Gall Estima Balan 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Gerard Pons-Moll
    • 1
  • Laura Leal-Taixé
    • 1
  • Juergen Gall
    • 2
    • 3
  • Bodo Rosenhahn
    • 1
  1. 1.Leibniz UniversityHannoverGermany
  2. 2.BIWI, ETH ZurichSwitzerland
  3. 3.MPI for Intelligent SystemsGermany

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