Carrier phase component removal: A generalized least-squares approach
Chen, L. Tay, C.-J.
Chen, L.
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Abstract
In fringe projection profilometry, an object shape is evaluated through phase distribution extracted from a projected fringe pattern. For parallel illumination geometry, the carrier phase component introduced by the fringes is spatially linear, whereas nonparallel illumination would lead to a nonlinear carrier. In this study, a general approach for the removal of a nonlinear-carrier phase component is proposed. A series expansion technique is used to approximate the carrier phase function, and a least-squares method is developed to estimate the unknown coefficients of the series. The theoretical analysis is given on the basis of a divergent illumination geometry with carrier fringes in the x direction. The method is also extended to include a curved surface-fitting approach, which is applicable to various measurement system geometries. © 2006 Optical Society of America.
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Source Title
Journal of the Optical Society of America A: Optics and Image Science, and Vision
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Date
2006-02
DOI
10.1364/JOSAA.23.000435
Type
Article