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dc.contributor.authorHe, Xiaoyuen_US
dc.contributor.authorZheng, Dongliangen_US
dc.contributor.authorQian, Kemaoen_US
dc.contributor.authorChristopoulos, Georgeen_US
dc.identifier.citationHe, X., Zheng, D., Qian, K. & Christopoulos, G. (2019). Quaternary gray-code phase unwrapping for binary fringe projection profilometry. Optics and Lasers in Engineering, 121, 358-368.
dc.description.abstractIn order to achieve a higher speed for fringe projection profilometry, we propose a quaternary gray-code phase unwrapping method using only two defocused binary patterns. We present a weighted optimization algorithm for the design of special binary code patterns. The designed binary patterns are projected on the object with a defocused projector, and interestingly become quaternary patterns which are more expressive gray codes. After the distorted code patterns are captured by a camera, they will undergo our proposed normalization-denoising-clustering process to recover the ideal gray codes. Besides, continuity/geometry constraints are integrated with this phase unwrapping method to further reduce the number of required patterns. The integrated method can recover a high-quality 3D shape with only five binary patterns including three patterns for three-step phase shifting algorithms and two for our phase unwrapping method. The effectiveness of the proposed method is demonstrated by both simulations and experiments.en_US
dc.relation.ispartofOptics and Lasers in Engineeringen_US
dc.rights© 2019 Elsevier Ltd. All rights reserved.en_US
dc.subjectEngineering::Computer science and engineeringen_US
dc.titleQuaternary gray-code phase unwrapping for binary fringe projection profilometryen_US
dc.typeJournal Articleen
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.schoolSchool of Computer Science and Engineeringen_US
dc.contributor.schoolCollege of Business (Nanyang Business School)en_US
dc.subject.keywordsQuaternary Gray Codeen_US
dc.subject.keywordsPhase Unwrappingen_US
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