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Proceedings Paper

Algorithm For Minimizing The Effect Of Low Frequency Errors In Kinematic Variables Derived From Cinematography
Author(s): Gilbert C. Willems; Edward B. Becker
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Paper Abstract

The Naval Biodynamics Laboratory is engaged in a series of experiments to evaluate the dynamic response of critical anatomical segments to acceleration environments. A three-dimensional phototarget configuration attached to a T-plate is acquired by at least two cameras and linear displacement and orientation parameters are derived by a least squares algorithm. Because of visibility problems, there are often changing target configurations as well as changes in the sensitivity of the solution to errors. Low frequency errors due to camera orientation, location, and calibration constants, as well as errors in the target locations on the T-plate coupled with changing target configurations can result in dis-continuous jumps in the derived kinematic variables. This paper describes an algorithm for modifying the least squares solution so as to minimize the effect of these perturbations without compromising the optimum long-time characteristics of the least squares solution. Several examples comparing solutions with and without the algorithm will be presented.

Paper Details

Date Published: 24 February 1982
PDF: 5 pages
Proc. SPIE 0291, 2nd Intl Symp of Biomechanics Cinematography and High Speed Photography, (24 February 1982); doi: 10.1117/12.932307
Show Author Affiliations
Gilbert C. Willems, Naval Biodynamics Laboratory (United States)
Edward B. Becker, Naval Biodynamics Laboratory (United States)

Published in SPIE Proceedings Vol. 0291:
2nd Intl Symp of Biomechanics Cinematography and High Speed Photography
Juris Terauds, Editor(s)

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