期刊
OPTICS AND LASERS IN ENGINEERING
卷 150, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2021.106854
关键词
Stereo-digital image correlation; Large-scale; Camera calibration; Active phase target; Epipolar geometry; Five-point algorithm
类别
资金
- National Key Research and Development Program of China [2018YFB0703500]
- National Natural Science Foundation of China [11925202, 11872009, 11632010]
The proposed method calibrates the intrinsic parameters of each camera using phase targets and computes scale-free extrinsic parameters from DIC registration, providing a viable solution for large-scale 3D deformation measurement tasks.
We propose an easy-to-implement and accurate calibration method for large-scale stereo-digital image correlation (stereo-DIC). First, the intrinsic parameters of each camera are separately calibrated using a regular-sized phase target. Using phase-shifted circular fringe patterns that feature the advantage of being insensitive to the defocus, the phase target can be placed in the close range of each camera. Then, scale-free extrinsic parameters are computed from the epipolar geometry, which can be easily retrieved from DIC registration of homologous point pairs in the stereo images of a test specimen surface. These intrinsic and scale-free extrinsic parameters are used as the initial guess for further optimizing the calibration results. Further, by measuring objects with known physical size, the scale information of the stereo-DIC system can be determined. The metrological performance of the proposed method is evaluated by large-scale shape reconstruction and deformation measurement tests. The obtained results demonstrate that the proposed method is a viable solution for the large-scale 3D deformation measurement tasks.
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