We are currently running a study in which
complex 3D whole body motions are being captured
using a camera-based marker tracking system.
One of the challenges of this technology is dealing
with marker dropouts, which occur when an insufficient
number of cameras (2) are able to see the marker in
My question: has anyone developed or used a method of
estimating the 3D location of these "unseen" markers
utilizing the kinematic constraint information of the
links (i.e. hip/knee separation, etc)?

Thanks in advance. Per usual, a summary of the responses
will be posted.

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Ulrich Raschke, Ph.D. Tel: +1-313-763-5773
Center for Ergonomics Fax: +1-313-764-3451
University of Michigan e-mail:
1205 Beal Ave.
Ann Arbor, MI 48109-2117
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