Spatio-temporal phase retrieval in speckle interferometry with Hilbert transform and two-dimensional phase unwrapping

2014 ◽  
Vol 53 (12) ◽  
pp. 124104 ◽  
Author(s):  
Xiangyu Li ◽  
Zhanhua Huang ◽  
Meng Zhu ◽  
Jin He ◽  
Hao Zhang
Keyword(s):  
Hilbert Transform ◽  
Phase Retrieval ◽  
Speckle Interferometry ◽  
Phase Unwrapping ◽  
Two Dimensional ◽  
Temporal Phase ◽  
Spatio Temporal

Practical Framework for Phase Retrieval and Invalidity Identification with Temporal Phase Unwrapping Method in Fringe Projection Profilometry

2011 ◽  
Vol 83 ◽  
pp. 179-184 ◽  
Author(s):  
Lei Huang ◽  
Anand Krishna Asundi
Keyword(s):  
Phase Retrieval ◽  
Phase Relationship ◽  
Phase Unwrapping ◽  
Three Dimensions ◽  
Fringe Projection ◽  
Temporal Phase ◽  
Absolute Phase ◽  
Fringe Patterns ◽  
Mean Square Errors ◽  
Fringe Projection Profilometry

Phase retrieval from fringe patterns is a primary procedure in fringe projection profilometry. Only accurate phase values result in three dimensions with certain accuracy. Phase shifting method plus temporal phase unwrapping approach provides not only the unwrapped absolute phase, but also the modulation map, background map, root mean square errors of least squares fitting, and phase relationship between two neighboring pixels, which can be used for the identification of phase invalidity. A practical phase retrieval frame work is presented to accurately calculate the absolute phase within reliable regions only, with which those unavailable phase points can be automatically identified with thresholds selection and criterion testing and then removed or interpolated according to applications. Experimental results show practical feasibility of the proposed framework.

Hydrodynamic-driven morphogenesis of karst draperies: spatio-temporal analysis of the two-dimensional impulse response

2021 ◽  
Vol 910 ◽  
Author(s):  
Pier Giuseppe Ledda ◽  
Gioele Balestra ◽  
Gaétan Lerisson ◽  
Benoit Scheid ◽  
Matthieu Wyart ◽  
...  
Keyword(s):  
Impulse Response ◽  
Temporal Analysis ◽  
Two Dimensional ◽  
Spatio Temporal

Abstract

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