4.7 Article

Temporal phase-unwrapping in fringe projection profilometry: Increasing the accuracy with equidistant long time-steps sampling

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OPTICS AND LASERS IN ENGINEERING
卷 167, 期 -, 页码 -

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ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2023.107591

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Shape analysis; Profilometry; Temporal phase-unwrapping

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This paper proposes a temporal phase unwrapping method for fringe projection profilometry, specifically designed for unwrapping temporal phase sequences with equidistant long-time steps. Simulated and experimental results demonstrate the superiority of this method compared to existing methods, and its applicability for measuring complex objects.
Temporal phase-unwrapping methods for fringe projection profilometry, mainly represented by the multi-frequency and multi-wavelength classes, are fundamental to recovering the 3D information from the continu-ous phase, also allowing measure discontinuities and isolated objects. In this paper, it is proposed a temporal phase unwrapping method for fringe projection profilometry. This method is specially designed to unwrap tem-poral phase sequences with equidistant long-time steps. As will be shown, this kind of temporal sampling allows increasing the accuracy of measurements. Simulated and real experimental results realized on a flat plate demon-strate the superiority of this proposal compared with leading already reported methods. Also, some experiments with complex objects are presented to demonstrate its applicability.

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