In fringe projection profilometry, inevitable distortion of optical lenses decreases phase accuracy and decreases the quality of 3D point clouds. For camera lens distortion, existing compensation methods include real time look-up tables derived from the related parameters of camera calibration. However, for projector lens distortion, so far, post-undistortion methods iteratively correcting lens distortion are relatively time-consuming while, despite avoiding iteration, pre-distortion methods are not suitable for binary fringe patterns. In this paper, we aim to achieve real-time phase correction for the projector by means of a scale-offset model that characterizes projector distortion by four correction parameters within a small-enough area, and thus we can speed up the post-undistortion by looking up tables. Experiments show that the proposed method can suppress the distortion error by a factor of 20 ×, i.e., the error of root mean square is less than 45 µm/0.7%0, while also proposed improving the computation speed by a factor of 50× over traditional iterative post-undistortion.
|Number of pages||16|
|State||Published - Jul 4 2022|
Bibliographical noteFunding Information:
Sichuan Province Science and Technology Support Program (2022YFG0233); Sichuan University (2020SCUNL204).
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics