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Proceedings Paper

Using the auxiliary camera for system calibration of 3D measurement by digital speckle
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Paper Abstract

The study of 3D shape measurement by digital speckle temporal sequence correlation have drawn a lot of attention by its own advantages, however, the measurement mainly for depth z-coordinate, horizontal physical coordinate (x, y) are usually marked as image pixel coordinate. In this paper, a new approach for the system calibration is proposed. With an auxiliary camera, we made up the temporary binocular vision system, which are used for the calibration of horizontal coordinates (mm) while the temporal sequence reference-speckle-sets are calibrated. First, the binocular vision system has been calibrated using the traditional method. Then, the digital speckles are projected on the reference plane, which is moved by equal distance in the direction of depth, temporal sequence speckle images are acquired with camera as reference sets. When the reference plane is in the first position and final position, crossed fringe pattern are projected to the plane respectively. The control points of pixel coordinates are extracted by Fourier analysis from the images, and the physical coordinates are calculated by the binocular vision. The physical coordinates corresponding to each pixel of the images are calculated by interpolation algorithm. Finally, the x and y corresponding to arbitrary depth value z are obtained by the geometric formula. Experiments prove that our method can fast and flexibly measure the 3D shape of an object as point cloud.

Paper Details

Date Published: 2 June 2014
PDF: 10 pages
Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 923411 (2 June 2014); doi: 10.1117/12.2053228
Show Author Affiliations
Junpeng Xue, Sichuan Univ. (China)
Xianyu Su, Sichuan Univ. (China)
Qican Zhang, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 9234:
International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics
Somnuk Sirisoonthorn, Editor(s)

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