Rapid autofocusing method for digital fringe projection techniques

Liming Chen; Yuchen Yang; Song Zhang

doi:10.1117/12.3029868

30 September 2024 Rapid autofocusing method for digital fringe projection techniques

Liming Chen, Yuchen Yang, Song Zhang

Author Affiliations +

Proceedings Volume 13135, Interferometry and Structured Light 2024; 131350F (2024) https://doi.org/10.1117/12.3029868
Event: Optical Engineering + Applications, 2024, San Diego, California, United States

Abstract

This paper presents an autofocusing method that can significantly expedite the autofocusing process in digital fringe projection. The proposed method employs an electrically tunable lens (ETL) to adjust the camera focal length. Initially, the proposed method roughly reconstructs the 3D shape of the measured object using three-step low-frequency phase-shifted fringe patterns. Then, the camera focal length is tuned to focus the measured object by analyzing the 3D data of the rough measurement. Finally, high-frequency phase-shifted fringe patterns are used to reconstruct a high-quality 3D point cloud. Experimental results demonstrated the success of the proposed method.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Liming Chen, Yuchen Yang, and Song Zhang "Rapid autofocusing method for digital fringe projection techniques", Proc. SPIE 13135, Interferometry and Structured Light 2024, 131350F (30 September 2024); https://doi.org/10.1117/12.3029868

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