Problem of phase unwrapping for fringe pattern overlaid with random noise and segmented discontinuity

1996 ◽  
Author(s):  
Xiaoyuan Peng ◽  
S.M. Zhu ◽  
S.H. Ye ◽  
Hans J. Tiziani
Keyword(s):  
Fringe Pattern ◽  
Random Noise ◽  
Phase Unwrapping ◽  
Title Problem

Fast 3D Shape Measurement of Complex Objects Combining S-transform Profilometry and Sub-Pixel Refinement

2020 ◽  
Author(s):  
Feng Lu ◽  
Jikun Yang
Keyword(s):  
Fringe Pattern ◽  
Vision System ◽  
Phase Unwrapping ◽  
Shape Measurement ◽  
Complex Objects ◽  
3D Shape ◽  
3D Shape Measurement ◽  
Phase Slope ◽  
S Transform ◽  
Hybrid Function

Abstract In the fast 3D shape measurement of complex objects, the process of phase unwrapping affects the measurement accuracy and measurement speed. To omit phase unwrapping, a fast 3D shape measurement method is proposed based on S-transform profilometry and sub-pixel refinement. In this work, Deformed fringe pattern is analyzed based on S-transform to get wrapped phase. To reduce the effect of phase unwrapping, a stereo vision system is employed. Firstly, a deformed fringe pattern is directly used and a hybrid function is proposed to get an initial parallax. Secondly, a phase slope algorithm is proposed to confirm edge point. At last, sub-pixel parallax is refined fromIcoordinate. Experiments are carried out to verify the feasibility and advantage of the proposed method. Results verify that the proposed method can provide fast and accurate 3D shape measurement of complex objects, especially for discontinuous objects and shiny objects.

Alignment in Lithography with Single Circular Fringe Pattern Phase Unwrapping

2014 ◽  
Vol 43 (11) ◽  
pp. 1112002
Author(s):  
徐锋 XU Feng ◽  
胡松 HU Song
Keyword(s):  
Fringe Pattern ◽  
Phase Unwrapping

scholarly journals Robust phase unwrapping based on non-coprime fringe pattern periods for deflectometry measurements

2019 ◽  
Author(s):  
Stephan Allgeier ◽  
Ulrich Gengenbach ◽  
Bernd Köhler ◽  
Klaus-Martin Reichert ◽  
Veit Hagenmeyer
Keyword(s):  
Fringe Pattern ◽  
Phase Unwrapping
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