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On tracking the motion of rigid bodies through edge detection and least-squares fitting

Laurence, Stuart (2012) On tracking the motion of rigid bodies through edge detection and least-squares fitting. Experiments in Fluids, Vol. 5 (2), pp. 387-401. Springer Verlag. DOI: 10.1007/s00348-011-1228-6. ISSN 0723-4864 (Print), 1432-1114 (electronic Version).

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Official URL: http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s00348-011-1228-6

Abstract

A class of techniques is investigated for determining at least three components (two translational and one rotational) of the motion of a rigid body from silhouette images, with particular emphasis on motion within a fluid. The investigated techniques all employ edge detection followed by some form of least-squares fitting to the detected points in determining the movement of the body. Four techniques are discussed and, through both an artificial image analysis and calibrated sphere measurements, are shown to be capable of measuring displacements down to a few thousandths of a pixel under low image noise conditions (<2%). Measurements of two configurations in a high-enthalpy shock tunnel demonstrate the capabilities of the techniques under experimental conditions. In particular, a technique referred to as edge-tracking is introduced, which can be employed in situations where the model profile is unknown and/or only some fraction of it is visible. This latter quality is especially useful for measurements in high-enthalpy facilities, where test-gas luminosity can obscure a significant extent of the model outline. A further advantage of this technique is that, even for complex geometries, the fitting procedure can typically be reduced to solving a sequence of linear least-squares problems, rather than a nonlinear one, with a corresponding benefit in computational efficiency.

Document Type:Article
Additional Information:Published online: 24. November 2011
Title:On tracking the motion of rigid bodies through edge detection and least-squares fitting
Authors:
AuthorsInstitution or Email of Authors
Laurence, Stuartstuart.laurence@dlr.de
Date:2012
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 5
DOI:10.1007/s00348-011-1228-6
Page Range:pp. 387-401
Publisher:Springer Verlag
ISSN:0723-4864 (Print), 1432-1114 (electronic Version)
Status:Published
Keywords:visual tracking, force measurement
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Stuart Laurence
Deposited On:14 Dec 2011 09:10
Last Modified:12 Dec 2013 21:26

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