"Autofocusing method for high-resolution three-dimensional profilometry," (2020)

[121] X. Hu, G. Wang, J.-S. Hyun, Y. Zhang, H. Yang, S. Zhang, "Autofocusing method for high-resolution three-dimensional profilometry," Opt. Lett. 45(2), 375-378 (2020)

Abstract

State-of-the-art high-accuracy three-dimensional (3D) profilometry systems typically use lens with a fixed focal length, making it difficult for them to measure scenes with large depth variations especially dynamically changing ones. To address this need, this Letter proposes a novel autofocusing method for high-resolution 3D profilometry with a digital fringe projection (DFP) technique by 1) developing a novel continuous geometric parameter model for systems using electronically tunable lenses, and 2) employing a focal plane detection algorithm. The validity of the proposed method is confirmed by experiments.