"Autofocusing method for digital fringe projection system with dual projectors," (2020)
/M. Zhong, X. Hu, F. Chen, C. Xiao, D. Peng, and S. Zhang, "Autofocusing method for digital fringe projection system with dual projectors," Optics Express 28(9), 12609-12620 (2020)
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; 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.