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• W2977549871 abstract "The state-of-the-art 3D shape measurement system has rather shallow working volume due to the limited depth-of-field (DOF) of conventional lens. In this paper, we propose to use the electrically tunable lens to substantially enlarge the DOF. Specifically, we capture always in-focus phase-shifted fringe patterns by precisely synchronizing the tunable lens attached to the camera with the image acquisition and the pattern projection; we develop a phase unwrapping framework that fully utilizes the geometric constraint from the camera focal length setting; and we pre-calibrate the system under different focal distance to reconstruct 3D shape from unwrapped phase map. To validate the proposed idea, we developed a prototype system that can perform high-quality measurement for the depth range of approximately 1,000 mm (400 mm - 1400 mm) with the measurement error of 0.05%. Furthermore, we demonstrated that such a technique can be used for real-time 3D shape measurement by experimentally measuring moving objects." @default.
• W2977549871 created "2019-10-10" @default.
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• W2977549871 date "2019-10-01" @default.
• W2977549871 modified "2023-09-25" @default.
• W2977549871 title "Large depth-of-field 3D shape measurement using an electrically tunable lens" @default.
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• W2977549871 doi "https://doi.org/10.1364/oe.27.029697" @default.
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