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

Junpeng Xue; Xianyu Su; Qican Zhang

doi:10.1117/12.2053228

2 June 2014 Using the auxiliary camera for system calibration of 3D measurement by digital speckle

Junpeng Xue, Xianyu Su, Qican Zhang

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 923411 (2014) https://doi.org/10.1117/12.2053228
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

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.

Citation Download Citation

Junpeng Xue, Xianyu Su, and Qican Zhang "Using the auxiliary camera for system calibration of 3D measurement by digital speckle", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 923411 (2 June 2014); https://doi.org/10.1117/12.2053228

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KEYWORDS

Speckle

Calibration

Cameras

3D metrology

Imaging systems

Clouds

Digital photography

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