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Improved phase-unwrapping method using geometric constraints
2017
Journal of Modern Optics
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Zhang et.al. proposed an enhanced two-frequency phase-shifting method to use geometric constraints of digital fringe projection(DFP) to reduce the noise impact due to the large frequency ratio. ...
In this paper, we proposed an improved method, which eliminates the system calibration and determination in Zhang's method,meanwhile does not need to use the low frequency fringe pattern. ...
Conclusion In this paper, we propose an improved phase-unwrapping method using geometric constraints. ...
doi:10.1080/09500340.2017.1284279
fatcat:hic4cgem25gnpejohjrtdb5mfe
Deep-learning-enabled geometric constraints and phase unwrapping for single-shot absolute 3D shape measurement
[article]
2020
arXiv
pre-print
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The stereo phase unwrapping (SPU) technologies based on geometric constraints can eliminate phase ambiguity without projecting any additional fringe patterns, which maximizes the efficiency of the retrieval ...
Inspired by the recent success of deep learning technologies for phase analysis, we demonstrate that deep learning can be an effective tool that organically unifies the phase retrieval, geometric constraints ...
constraints and phase unwrapping method. ...
arXiv:2001.01439v1
fatcat:675hcmimrre7foj4tqqg4objiq
Enhanced two-frequency phase-shifting method
2016
Applied Optics
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This paper proposes a method to use geometric constraints of digital fringe projection system to substantially reduce the noise impact by allowing the use of more than one period of equivalent phase map ...
for temporal phase unwrapping. ...
SUMMARY This paper has presented a method to substantially improve the conventional two-frequency phase-shifting algorithm by using geometric constraints of the DFP system. ...
doi:10.1364/ao.55.004395
pmid:27411193
fatcat:7qqlonyazbgqljxckcfl6k27ie
Enhanced dual-frequency pattern scheme based on spatial-temporal fringes method
2018
Journal of Modern Optics
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2017 pre-print arXiv:1705.06816v1 fatcat:rigzbsslvbfgza2z4jkqvrnb3u
The low frequency phase is obtained from two low frequency fringe patterns by the STF method, so the signal lobes can be extracted accurately as they are far away from each other. ...
One of the major challenges of employing a dual-frequency phase-shifting algorithm for phase retrieval is its sensitivity to noise. ...
geometric constraints method is used to unwrap the low frequency phase. ...
doi:10.1080/09500340.2018.1455908
fatcat:nfdtxrhoxzbnxbcwozyp2e7sxq
Three-dimensional absolute shape measurement by combining binary statistical pattern matching with phase-shifting methods
2017
Applied Optics
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The coarse correspondence map is further refined by using the wrapped phase as a constraint. We then use the refined correspondence map to determine a fringe order for absolute phase unwrapping. ...
This paper presents a novel method that leverages the stereo geometric relationship between projector and camera for absolute phase unwrapping on a standard one-projector and one-camera structured light ...
To our knowledge, none of the existing temporal phase-unwrapping methods fully utilizes the geometric constraints of the structured light system for fringe-order determination. ...
doi:10.1364/ao.56.005418
pmid:29047499
fatcat:fl7hbjfrjfffpfpatoxmxd2ytu
Improvement of Phase Unwrapping Algorithms by Epipolar Constraints
2015
Proceedings of the 10th International Conference on Computer Vision Theory and Applications
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In this paper we suggest to support phase unwrapping algorithms by additional constraints induced by the scanning setup. ...
We demonstrate this by exemplarily integrating the candidate map into a local path following and a global minimum norm unwrapping method. ...
We believe that existing unwrapping methods can be used to achieve this and thus suggest to use the candidate map as reasonable preprocessing step for any classical phase unwrapping method. ...
doi:10.5220/0005271404720479
dblp:conf/visapp/KohlerPNS15
fatcat:3222rhothzeo5m7zl76uen5lum
Motion-induced error reduction by combining Fourier transform profilometry with phase-shifting profilometry
2016
Optics Express
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The proposed method is composed of three major steps: Step 1 is to extract continuous relative phase maps for each isolated object with single-shot FTP method and spatial phase unwrapping; Step 2 is to ...
obtain an absolute phase map of the entire scene using PSP method, albeit motion-induced errors exist on the extracted absolute phase map; and Step 3 is to shift the continuous relative phase maps from ...
Phase unwrapping using geometric constraint As recently proposed by An et al. [25], one of the methods that removes 2π discontinuities on a wrapped phase map is by using geometric constraints. ...
doi:10.1364/oe.24.023289
pmid:27828393
fatcat:4r4yuw6rkfd4pkxkv23jf7r3c4
Absolute Phase Retrieval Using One Coded Pattern and Geometric Constraints of Fringe Projection System
2018
Applied Sciences
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Compared with the conventional method, the measurement depth range is significantly improved. Finally, the wrapped phase can be unwrapped for absolute phase map. ...
Based on geometric constraints of fringe projection system, the minimum fringe order map can be created, upon which the fringe order can be calculated from the code word. ...
For example, at point A,
Geometric Constraints for Phase Unwrapping An et al. ...
doi:10.3390/app8122673
fatcat:sedojzha4bhbpfwcvmywc24gsi
Fast 3D Surface Measurement with Wrapped Phase and Pseudorandom Image
2019
Sensors
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In this paper, we present a wrapped phase and pseudorandom image method and develop an experimental system aiming to avoid the process of phase unwrapping. ...
The most critical step in our new methodology is using the wrapped phase and the epipolar constraint between one camera and a projector, which can obtain several candidate 3D points within the measurement ...
[10] were interested in using the geometric constraints between multiple cameras and projectors to overcome the obstacle of wrapped phase periodicity. ...
doi:10.3390/s19194185
fatcat:zpp5wkrm7jdstpzdulf5ibgjce
Single-shot absolute 3D shape measurement with Fourier transform profilometry
2016
Applied Optics
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By using geometric constraints, an absolute phase map can be retrieved point-by-point from one single grayscale fringe image. ...
the absolute phase map solely from one single grayscale fringe image. ...
Fig. 3 . 3 Concept of removing a 2π jump of a low-frequency phase map by using the minimum phase map determined from geometric constraints. ...
doi:10.1364/ao.55.005219
pmid:27409213
fatcat:uw54bkgw65ekpm6kg43zc37lsu
PURE: Scalable Phase Unwrapping with Spatial Redundant Arcs
[article]
2018
arXiv
pre-print
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Phase unwrapping is a key problem in many coherent imaging systems, such as synthetic aperture radar (SAR) interferometry. ...
A general formulation for redundant integration of finite differences for phase unwrapping (Costantini et al., 2010) was shown to produce a more reliable solution by exploiting redundant differential estimates ...
Acknowledgments We would like to thank Piyush Agram for introducing us to Phase Unwrapping and Redundant Arcs technique and for the numerous discussion that shaped the problem definition. ...
arXiv:1805.00321v2
fatcat:vbu2mzlg3jhmhdnsuplzbjf7ya
Susceptibility artefact correction using dynamic graph cuts: Application to neurosurgery
2014
Medical Image Analysis
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A phase unwrapping algorithm is presented that can efficiently compute the B0 magnetic field inhomogeneity map as well as the uncertainty associated with the estimated solution through the use of dynamic ...
The proposed method combines fieldmap and image registration based correction techniques in a unified framework. ...
Section 5 describes how uncertainty information can be computed from the phase unwrapping step and can be used with an image registration method to further improve results. ...
doi:10.1016/j.media.2014.06.008
pmid:25047865
pmcid:PMC6742505
fatcat:fhwo3snw5fhndmox4zavxxqvh4
Efficient Multi-frequency Phase Unwrapping Using Kernel Density Estimation
[chapter]
2016
Lecture Notes in Computer Science
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In this paper we introduce an efficient method to unwrap multi-frequency phase estimates for time-of-flight ranging. ...
The intended Kinect v2 use case is scenes with less than 8m range, and for such cases we observe consistent improvements, while maintaining real-time performance. ...
Another way to unwrap the time-of-flight phase shift is to use surface reflectivity constraints. ...
doi:10.1007/978-3-319-46493-0_11
fatcat:azywisud6fgbbejwq7bk7l76vu
Efficient Multi-Frequency Phase Unwrapping using Kernel Density Estimation
[article]
2016
arXiv
pre-print
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The file type is application/pdf.
In this paper we introduce an efficient method to unwrap multi-frequency phase estimates for time-of-flight ranging. ...
The intended Kinect v2 use case is scenes with less than 8m range, and for such cases we observe consistent improvements, while maintaining real-time performance. ...
Another way to unwrap the time-of-flight phase shift is to use surface reflectivity constraints. ...
arXiv:1608.05209v1
fatcat:muqcfbi2avam7bcf6ursisg2j4
Assessment of Thermal Environment in a Kitchen with a New Ventilation System
2019
E3S Web of Conferences
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TSV was improved with the new ventilation system. ...
This investigation developed a new ventilation system for Chinese kitchens to improve thermal comfort level. ...
[10] were interested in using the geometric constraints between multiple cameras and projectors to overcome the obstacle of wrapped phase periodicity. ...
doi:10.1051/e3sconf/201911102034
fatcat:jzzmswx545gtjhabfewqupsdu4
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