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Proceedings Paper

A modified Laplacian phase unwrapping algorithm
Author(s): Fanzhou Wang; Chenxing Wang; Qingze Guan; Zhichao Sheng
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Paper Abstract

Phase unwrapping is a general problem in many measurement fields, and plenty mature methods have been put up with. Among them, Laplacian operator combined Fast Fourier-based phase unwrapping method is widely used because of its high speed and relative robustness. However, in some applications such as structured-light 3D reconstruction, there always appear shadows of object in the object-edge regions. These shadows and discontinuity regions might cause big errors in unwrapping results, which will be even more serious for the Fast Fourier-based method. Therefore, in this paper, we analyzed the problem theoretically and present a modified algorithm based on the reference-phase mask. With a designed phase mask, this practical algorithm can remove errors effectively and reach a more precise result. The phase mask will be produced automatically based on the edge detection of the problematic regions combined with an empirical mode decomposition algorithm. The whole procedure will be complemented without manual intervention. Comparison experiments show that our method has great improvement than the original methods in the aspects of accuracy speed, and robustness. This enables the Laplacian based unwrapping algorithm to have compatibility with more optical, physical, medical and engineering occasions.

Paper Details

Date Published: 16 October 2019
PDF: 6 pages
Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 112050P (16 October 2019); doi: 10.1117/12.2542950
Show Author Affiliations
Fanzhou Wang, Southeast Univ. (China)
Chenxing Wang, Southeast Univ. (China)
Qingze Guan, Southeast Univ. (China)
Zhichao Sheng, Southeast Univ. (China)

Published in SPIE Proceedings Vol. 11205:
Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019)
Anand Asundi; Motoharu Fujigaki; Huimin Xie; Qican Zhang; Song Zhang; Jianguo Zhu; Qian Kemao, Editor(s)

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