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Optical Engineering

Easy calibration technique for stereo vision using a circle grid
Author(s): Perng-Fei Luo; Joyce Wu
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Paper Abstract

Combined with the digital image correlation (DIC), the stereo vision calibrated by a circle grid can be used to measure the surface deformation of a deformable body. The grid dot centers are taken as the calibration points. A subpixel localization technique was developed to precisely find the location of the edge points of a dot. A conical section was then fitted to the obtained edge points to locate the dot center so that the intrinsic and extrinsic camera parameters can be accurately extracted after the camera calibration. The baseline measurement error of the stereo vision was evaluated by performing rigid body translation tests. By using the DIC to find the conjugate pairs in stereo images, the calibrated stereo vision is used to measure the strain field of a tension test specimen to evaluate its applicability to the surface deformation measurement of a deformable body.

Paper Details

Date Published: 1 March 2008
PDF: 10 pages
Opt. Eng. 47(3) 033607 doi: 10.1117/1.2897237
Published in: Optical Engineering Volume 47, Issue 3
Show Author Affiliations
Perng-Fei Luo, Chung Hua Univ. (Taiwan)
Joyce Wu, Chung Hua Univ. (Taiwan)


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