Correcting projector lens distortion in real time with a scale-offset model for structured light illumination

Geyou Zhang, Bin Xu, Daniel L. Lau, Ce Zhu, Kai Liu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)24507-24522
Number of pages16
JournalOptics Express
Volume30
Issue number14
DOIs
StatePublished - Jul 4 2022

Bibliographical note

Publisher Copyright:
© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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