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System and a method for motion tracking using a calibration unit

  • US 7,725,279 B2
  • Filed: 03/14/2008
  • Issued: 05/25/2010
  • Est. Priority Date: 03/15/2007
  • Status: Active Grant
First Claim
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1. A motion tracking system for tracking a movement of an object in a three-dimensional space, the object being composed of object portions having individual dimensions and mutual proportions and being sequentially interconnected by joints, the system comprising:

  • orientation measurement units for measuring data related to at least an orientation of the object portions, wherein the orientation measurement units are arranged in positional and orientational relationships with respective object portions and having at least orientational parameters;

    a processor for receiving data from the orientation measurement units, the processor comprising a module for deriving orientation and/or position information of the object portions using the received data, characterized in thatthe processor further comprises a calibration unit arranged to calculate calibration values for determining at least mutual proportions of the object portions and at least orientational parameters of the orientation measurement units based on received data, predetermined constraints and additional input data comprising knowledge about a distance between at least two points and/or knowledge about an acceleration of at least two object portions connected by a joint.

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