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System and method for tracking a global shape of an object in motion

  • US 7,558,402 B2
  • Filed: 03/05/2004
  • Issued: 07/07/2009
  • Est. Priority Date: 03/07/2003
  • Status: Expired due to Fees
First Claim
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1. A computer implemented method for tracking a deformable global shape of an object in motion in a sequence of digital medical images, the method performed by the computer comprising the steps of:

  • providing a probabilistic subspace shape model for the deformable global shape derived from a set of training shapes;

    defining one or more control points along the deformable global shape;

    tracking each of the one or more control points as the object is in motion;

    estimating uncertainty of a location of a control point in motion;

    exploiting the uncertainty to constrain the deformable global shape using a point dependent covariance matrix to employ the subspace shape constraint model using a non-orthogonal projection;

    fusing the subspace constraint model and the uncertainty to determine a current location of the object by correcting outlier control points according to the probabilistic subspace shape model; and

    remedying error accumulation during tracking of the one or more control points by using a multi-template adaptive matching framework.

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