Removing harmonic distortion of measurements of a defocusing three-step phase-shifting digital fringe projection system |
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| Institution: | 1. The College of Computer Science and Technology, Zhejiang University, China;2. The Department of Computer Science, University of Houston, United States;1. ISRO Satellite Centre, Bangalore, Karnataka 560017, India;2. Bundelkhand Institute of Engineering and Technology, Jhansi, UP 284128, India;1. School of Physics and Electronics, Hunan Province Cooperative Innovation Center for The Construction & Development of Dongting Lake Ecological Economic Zone, Hunan Province Key Laboratory of Photoelectric Information Integration and Optical Manufacturing Technology, Hunan University of Arts and Science, Changde, Hunan 415000, PR China;2. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore |
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| Abstract: | Binary defocusing method was adopted in 3D profilometry as it allows real-time measurement and does not need to handle the luminance nonlinearity of a projector. Current patch-based binary fringe patterns are periodic and carry strong harmonic distortion as compared with the ideal sinusoidal fringe patterns, which affects the measuring performance remarkably. In this paper, we propose a framework for generating aperiodic fringe patterns based on optimized patches. The produced fringe patterns can significantly lower the noise floor and suppress the harmonic distortion in the constructed phase map. Accordingly, the achieved depth measuring performance can be significantly improved. Special care is also taken during the optimization of the patches in our framework such that the depth measuring performance is robust to fringe period and defocusing extent. |
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| Keywords: | Fringe analysis 3D shape measurement Dithering Binary defocusing Optimization |
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