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  • Title: Autofocusing method for a digital fringe projection system with dual projectors.
    Author: Zhong M, Hu X, Chen F, Xiao C, Peng D, Zhang S.
    Journal: Opt Express; 2020 Apr 27; 28(9):12609-12620. PubMed ID: 32403755.
    Abstract:
    This paper presents a novel technique to achieve autofocusing for a three-dimensional (3D) profilometry system with dual projectors. The proposed system uses a camera that is attached with an electronically focus-tunable lens (ETL) that allows dynamic change of camera's focal plane such that the camera can focus on the object; the camera captures fringe patterns projected by each projector to establish corresponding points between two projectors, and two pre-calibrated projectors form triangulation for 3D reconstruction. We pre-calibrate the relationship between the depth and the current being used for each focal plane, perform a 3D shape measurement with an unknown focus level, and calculate the desired current value based on the initial 3D result. We developed a prototype system that can automatically focus on an object positioned between 450 mm to 850 mm.
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