Phase unwrapping method based on reliability and digital point array

Lei Song; Huimin Yue; Yong Liu; Yongzhi Liu

doi:10.1117/1.3562324

1 April 2011 Phase unwrapping method based on reliability and digital point array

Lei Song, Huimin Yue, Yong Liu, Yongzhi Liu

Author Affiliations +

Optical Engineering, Vol. 50, Issue 4, 043605 (April 2011). https://doi.org/10.1117/1.3562324

Abstract

Phase unwrapping, which usually involves complicated and time-consuming procedures, is crucial for phase-measuring profilometry. Unwrapping isolated phase regions with global phase discontinuity is challenging for traditional reliability ordering based phase unwrapping methods. This paper presents a novel method that combines the advantages of digital point array based active triangulation profilometry with a reliability of modulation ordering algorithm. Table entries that store spatial coordinates of sampling points are established, and the true phases measured by geometrical relationships are used to direct phase unwrapping. Different from the proposed 2D spatial unwrapping algorithms until now, the fringe order can be easily identified by referencing the patterns of multiple points. Additionally, unwrapping from the interior part of isolated regions following an optimized path is guaranteed. The prevention of penetration through invalid pixels into isolated regions ensures this new method will alleviate errors due to phase ambiguity. Simulation and experimental results demonstrate that the proposed technique can feasibly measure objects with a wide range of height variation.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Lei Song, Huimin Yue, Yong Liu, and Yongzhi Liu "Phase unwrapping method based on reliability and digital point array," Optical Engineering 50(4), 043605 (1 April 2011). https://doi.org/10.1117/1.3562324

Published: 1 April 2011

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