Instrumentation, Measurement, and Metrology

Easy calibration technique for stereo vision using a circle grid

[+] Author Affiliations
Perng-Fei Luo

Chung Hua University,Department of Mechanical Engineering, No. 707, Section 2, Wu Fu Road, Hsin Chu 30012, Taiwan

Joyce Wu

Chung Hua University,Department of Mechanical Engineering, No. 707, Section 2, Wu Fu Road, Hsin Chu 30012, Taiwan

Opt. Eng. 47(3), 033607 (March 21, 2008). doi:10.1117/1.2897237
History: Received June 12, 2007; Revised November 21, 2007; Accepted November 22, 2007; Published March 21, 2008
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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.

© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Perng-Fei Luo and Joyce Wu
"Easy calibration technique for stereo vision using a circle grid", Opt. Eng. 47(3), 033607 (March 21, 2008). ; http://dx.doi.org/10.1117/1.2897237


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