Fringe contrast-based 3D profilometry using fringe projection |
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Authors: | Lujie Chen Cho Jui Tay Yuanhao Huang |
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Affiliation: | Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore |
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Abstract: | Quality-guided algorithm is a widely used method in phase unwrapping. This paper shows an accurate quality map based on fringe contrast for 3D shape measurement. Phase-shifted fringe patterns are projected onto an object surface by a programmable liquid crystal projector and recorded by a CCD camera. A wrapped phase map and a fringe contrast map are extracted from the deformed fringe patterns by the phase-shifting technique. Guided by the contrast map, the quality-guided unwrapping algorithm minimizes unwanted shadow and non-uniform surface reflectance effects and is able to retrieve a correct surface profile. Validity of the proposed method is tested on a fish model and a cutting tool specimen. |
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Keywords: | Fringe contrast Quality-guided phase unwrapping Phase-shifting Shape measurement Fringe projection |
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