Directional phase-unwrapping algorithm and phase shift technique on hydrogel

Wu, Yiyang; Knox, Wayne H.

doi:10.1364/ao.420397

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…The unwrapped phase map accuracy is enhanced by the combination of BIM with a quality-guided unwrapping algorithm. A directional phase unwrapping algorithm with phaseshifting technique is proposed 13 . This fast quality-guided path phase-unwrapping applies well to situations that are geometrically well defined and is quite tolerant of phase noise.…”

Section: Introductionmentioning

confidence: 99%

Quality-guided mask cut method for phase unwrapping

Dong

Chen

et al. 2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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The phase unwrapping method is the important step of phase retrieval in fringe projection profilometry. Although the mask cut (MC) algorithm has been successfully applied in multiple fields, it also has inherent flaws. In order to overcome the shortcomings of MC algorithm, and synthesize the advantages of MC and quality-guided (QG) algorithm, a quality-guided mask-cutting (QG - MC) algorithm for phase unwrapping is proposed. The basic idea of QG - MC algorithm is to reduce the effects of noise on phase unwrapping at first., Then, the process of phase unwrapping is guided by the phase quality map from the point with the highest quality value to the point around that point. Take the point with the highest quality as the seed point, put its adjacent points into the queue, sort by quality value, and the new highest quality point is used as a seed point. Repeats the process until the queue is empty and the unwrapped phase will be obtained. To verify the feasibility and reliability of QG - MC algorithm, computer simulations and real experiments are carried out. The results show that the algorithm improves the efficiency of phase unwrapping.

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Section: Introductionmentioning

confidence: 99%

Quality-guided mask cut method for phase unwrapping

Dong

Chen

et al. 2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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Modification of surface morphology of hydrogels due to subsurface femtosecond laser micromachining

Ji-cun

Ding

et al. 2021

Appl. Opt.

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In this paper, we studied the effects of subsurface femtosecond laser micromachining on surface morphology in hydrogels. Depending on material properties and writing conditions, we found surface bumps when materials were hydrated, and trenches when they were dehydrated, which can be attributed to the localized change in water concentration. Such wavy surfaces by laser-induced refractive index change are not desirable in clinical contact lenses. Therefore, the minimization of surface bumps is necessary to ensure the user eye wearing comfort. In addition, we examined the optical effects of the surface features using interferometry and the surface morphology using profilometry. Finally, we proposed a simplified mechanical model based on localized swelling.

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Directional phase-unwrapping algorithm and phase shift technique on hydrogel

Cited by 2 publications

References 33 publications

Quality-guided mask cut method for phase unwrapping

Quality-guided mask cut method for phase unwrapping

Modification of surface morphology of hydrogels due to subsurface femtosecond laser micromachining

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