Temporal Phase Unwrapping for Digital Fringe Projection Systems

2018 ◽  
pp. 63-88
Keyword(s):  
Phase Unwrapping ◽  
Fringe Projection ◽  
Digital Fringe Projection ◽  
Temporal Phase

Comparison of Multi-Frequency Phase Unwrapping Algorithm for Shape Measurement Using Digital Fringe Projection

2011 ◽  
Vol 188 ◽  
pp. 258-262
Author(s):  
Wan Tao He ◽  
Xiang Lin Meng ◽  
Yan Yan Guo ◽  
Can Zhao
Keyword(s):  
High Efficiency ◽  
Technology Development ◽  
Three Dimensional ◽  
Phase Unwrapping ◽  
Fringe Projection ◽  
Shape Measurement ◽  
Accuracy Measurement ◽  
Digital Fringe Projection ◽  
Surface Discontinuities ◽  
Frequency Phase

As technology development, projected digital fringe pattern is widely used in measuring three- dimensional (3D) shape, even in the presence of surface discontinuities. This paper investigates the reliability and accuracy of two multi-frequency phase unwrapping algorithms by experimental means. The first, which unwraps through a sequence of phase maps produced with exponentially change in spatial frequency with time, is found to be less robust and accuracy than the second, which only use three different frequency to beat new frequency for unwrapping the phase. Through experiment, the best frequency, adjacent ratio for the first method and frequency difference for the second method are proposed for the high efficiency and accuracy measurement.

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.

scholarly journals The spatial-temporal phase unwrapping algorithm for fringe projection profilometry

2021 ◽  
Author(s):  
Haihua An ◽  
Yiping Cao ◽  
Haitao Wu ◽  
Na Yang ◽  
Cai Xu ◽  
...  
Keyword(s):  
Phase Unwrapping ◽  
Fringe Projection ◽  
Temporal Phase ◽  
Fringe Projection Profilometry
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