Proceedings ArticleDOI
Local weight selection for two-dimensional phase unwrapping
Rein-Lien Hsu,S. Chen,Anil K. Jain,C. Mercer +3 more
- Vol. 3, pp 871-875
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TLDR
This paper presents a quantitative scheme for selecting local weights for phase unwrapping on the basis of both the quality map and the wrapped phase, and demonstrates the validity of the phasor-weighted phase unwRApping approach.Abstract:
Local weights in phase unwrapping play an important role in guiding the flow of the phase integration. Unwrapping algorithms can proceed in a path-following or a non-path-following fashion. In path-following phase unwrapping algorithms, local weights guide the selection of unwrapping paths. In nonpath-following algorithms, the introduction of predetermined local weights is necessary to accommodate phase inconsistencies in practice. In current unwrapping algorithms, these local weights are extracted either from the quality information (correlation in interferometric synthetic aperture radar and modulation in phase shifting interferometry) or from the information contained in the wrapped phase difference alone. In other words, the crucial issue is how a phase unwrapping algorithm should select these location-associated weights in order to prevent the propagation of phase errors. This paper presents a quantitative scheme for selecting local weights for phase unwrapping opt the basis of both these types of information (the quality map and the wrapped phase). Real objects as well as synthetic ones have been investigated for various unwrapping methods in experiments. Integrated 3D free-form object models demonstrate the validity of the phasor-weighted phase unwrapping approach.read more
Citations
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Journal ArticleDOI
Reliability-guided phase-unwrapping algorithm for the measurement of discontinuous three-dimensional objects
TL;DR: A new phase-unwrapping method that merges the residue check principle and a Laplace phase derivative variance quality map that was developed and successfully completed was proposed.
Journal ArticleDOI
Regional phase unwrapping method based on fringe estimation and phase map segmentation
Sheng Liu,Lianxiang Yang +1 more
TL;DR: This work describes a novel method for unwrapping phase in a noise-disturbed phase map, which is characterized by broken fringes induced by different sources, such as a poor coherence length, high light or weak reflection on the sample surface, too dense fringes due to stress concentration, etc.
Journal ArticleDOI
Reliability-guided phase unwrapping algorithm following noncontinuous path based on color fringe projection
Wenguo Li,Wenguo Li,Suping Fang +2 more
TL;DR: A new method to define the reliability of pixel and path of phase unwrapping is presented, the pixel's intensity and color are employed in fringe analysis simultaneously and the reliability function is calculated based on modulation, second difference of wrapped phase, andsecond difference of modulation.
Patent
Method for phase unwrapping using confidence-based rework
TL;DR: In this paper, the authors present a method for phase-wrapped data including a plurality of nodes, which includes: selecting a root node from the plurality of node to start unwrapping, selecting next nodes to be unwrapped, from the neighbor nodes of the root node, dynamically calculating a confidence factor for each node being being unwraped, and when a closed loop wherein one node can be unwrap from either of two previously-unwrapped nodes is encountered and an unwrap value predicted by each of the prior nodes of two nodes are different during unwrap,
Proceedings ArticleDOI
Quality weight based on log modulation amplitude for fringe analysis during optical fringe measurement
TL;DR: In this paper, a new quality weight for phase reconstructing (PhR) in optical fringe measurement is proposed, which is based on the combination of Log Modulation Amplitude and Phase Derivative Variance (LMAPDV).
References
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Book
Two-Dimensional Phase Unwrapping: Theory, Algorithms, and Software
Dennis C. Ghiglia,Mark D. Pritt +1 more
TL;DR: Methods for Phase Unwrapping, Phase Data, Quality Maps, Masks, and Filters, and Minimum-Norm Methods.
Journal ArticleDOI
Two-dimensional phase unwrapping with minimum weighted discontinuity
TL;DR: In this article, the authors presented an algorithm that computes a weighted sum of discontinuity magnitudes from any initial guess, which is then used to find paths that follow discontinuity curves and extend them to form complete partitions.
Journal ArticleDOI
Fourier fringe analysis: the two-dimensional phase unwrapping problem.
TL;DR: A new phase unwrapping algorithm is described that uses local phase information to mask out those parts of the field that cause inconsistencies in the unwraps and can produce an approximately correct unwrapped.
Journal ArticleDOI
Processing of interferometric phase maps as complex-valued phasor images
TL;DR: Phase and amplitude information obtained from phase-shifting interferometry may be combined, to be a complex-valued phasor for every pixel of the image.
Journal ArticleDOI
Phase-unwrapping algorithm based on an adaptive criterion.
TL;DR: A new algorithm for phase unwrapping of phase maps with noise or logical inconsistencies is proposed, based on the use of an adaptive threshold and the second difference of the locally unwrapped phase as a selection criterion for the pixels to be processed.