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Method for tracking the motion of a 3-D figure

  • US 6,269,172 B1
  • Filed: 04/13/1998
  • Issued: 07/31/2001
  • Est. Priority Date: 04/13/1998
  • Status: Expired due to Term
First Claim
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1. A computerized method for tracking a moving articulated figure in a sequence of 2-D images, comprising the steps of:

  • fitting a 3-D kinematic model of the figure to a state trajectory of a 2-D model of the figure to estimate 3-D kinematic model parameters, the state trajectory comprising a sequence of state vectors, each state vector comprising parameters describing the figure in a corresponding image; and

    refining the estimated 3-D kinematic model parameters by fitting a 3-D kinematic model of the figure to the original sequence of images, the fitting comprising adjusting the 3-D kinematic model parameters so as to minimize residual error between a 2-D projection of the 3-D kinematic model and pixel measurements in each frame of the image sequence.

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