Three-Dimensional Structural Translation and Rotation Measurement Using Monocular Videogrammetry
Publication: Journal of Engineering Mechanics
Volume 136, Issue 7
Abstract
Measuring displacement for large-scale structures has always been an important yet challenging task. In most applications, it is not feasible to provide a stationary platform at the location where its displacements need to be measured. Recently, image-based technique for three-dimensional (3D) displacement measurement has been developed and proven to be applicable to civil engineering structures. Most of these developments, however, use two or more cameras and require sophisticated calibration using a total station. In this paper, we present a single-camera approach that can simultaneously measure both 3D translation and rotation of a planar target attached on a structure. The intrinsic parameters of the camera are first obtained using a planar calibration board arbitrarily positioned around the target location. The obtained intrinsic parameters establish the relationship between the 3D camera coordinates and the two-dimensional image coordinates. These parameters can then be used to extract the rotation and translation of the planar target using recorded image sequence. The proposed technique is illustrated using two laboratory tests and one field test. Results show that the proposed monocular videogrammetric technique is a simple and effective alternative method to measure 3D translation and rotation for civil engineering structures. It should be noted that the proposed technique cannot measure translation along the direction perpendicular to the image plane. Hence, proper caution should be taken when placing target and camera.
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Acknowledgments
This study is partly supported by the Hong Kong Research Grants Council Central Allocation Grant HKUST No. UNSPECIFIEDCA04/05.EG01 and Competitive Earmarked Research Grant 6111409.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 136 • Issue 7 • July 2010
Pages: 840 - 848
Copyright
© 2010 ASCE.
History
Received: Aug 27, 2008
Accepted: Dec 11, 2009
Published online: Dec 18, 2009
Published in print: Jul 2010
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