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Spatial shift unwrapping for digital fringe profilometry based on spatial shift estimation

[+] Author Affiliations
Pu Cao

University of Wollongong, School of Electrical, Computer and Telecommunications Engineering, Northfields Avenue, Wollongong NSW2522, Australia

Jiangtao Xi

University of Wollongong, School of Electrical, Computer and Telecommunications Engineering, Northfields Avenue, Wollongong NSW2522, Australia

Yanguang Yu

University of Wollongong, School of Electrical, Computer and Telecommunications Engineering, Northfields Avenue, Wollongong NSW2522, Australia

Qinghua Guo

University of Wollongong, School of Electrical, Computer and Telecommunications Engineering, Northfields Avenue, Wollongong NSW2522, Australia

J. Electron. Imaging. 23(4), 043002 (Jul 03, 2014). doi:10.1117/1.JEI.23.4.043002
History: Received March 30, 2014; Revised June 6, 2014; Accepted June 6, 2014
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Abstract.  An approach is presented to solve the problem of spatial shift wrapping associated with spatial shift estimation-based fringe pattern profilometry (FPP). This problem arises as the result of fringe reuses (that is, use of fringes with periodic light intensity variance), and the spatial shift can only be identified without ambiguity within the range of a fringe width. It is demonstrated that the problem is similar to the phase unwrapping problem associated with the phase-detection-based FPP, and the proposed method is inspired by the existing ideas of using multiple images with different wavelengths proposed for phase unwrapping. The effectiveness of the proposed method is verified by comparing experimental results against several objects, with the last object consisting of more complex surface features. We conclude by showing that our method is successful in reconstructing the fine details of the more complex object.

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© 2014 SPIE and IS&T

Citation

Pu Cao ; Jiangtao Xi ; Yanguang Yu and Qinghua Guo
"Spatial shift unwrapping for digital fringe profilometry based on spatial shift estimation", J. Electron. Imaging. 23(4), 043002 (Jul 03, 2014). ; http://dx.doi.org/10.1117/1.JEI.23.4.043002


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