Open AccessStereo-camera calibration for large-scale DIC measurements with active phase targets and planar mirrors
Author(s) -
Katia Genovese,
Yuxi Chi,
Bing Pan
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.009040
Subject(s) - calibration , optics , planar , phase (matter) , camera resectioning , field of view , computer science , scale (ratio) , physics , deformable mirror , artificial intelligence , computer vision , adaptive optics , computer graphics (images) , quantum mechanics
We propose an easy-to-implement yet accurate calibration method for large-scale 3D measurements that makes use of a regular-sized phase target and two planar mirrors. Being insensitive to severe defocus, the phase target is placed as to span a large depth within the field of view (FOV) of each camera for accurate intrinsic calibration. Extrinsic calibration is achieved by placing the phase target in the FOV of a short-range virtual stereo-system generated by the mirrors. Results from 3D shape and deformation measurements demonstrate that the proposed method is capable to operate within a working volume of 3 m × 2 m × 1.8 m with an error < 0.1% of the FOV thus opening to new possibilities for large-scale measurements in mechanical and civil engineering applications.