Improving the phase measurement by the apodization filter in the digital holography

Chang, Shifeng; Wang, Dayong; Wang, Yunxin; Zhao, Jie; Rong, Lü

doi:10.1117/12.999821

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…By introducing a window function into spatial and Fourier domains, ringing artifacts can be successfully apodized. [4][5][6] Among many windows functions, flat-head window functions such as the Tukey window and flat-head cosine function 4 are preferred. However, window functions applied in the spatial domain lose border information, and those applied in the Fourier domain lose high-frequency information.…”

Section: Introductionmentioning

confidence: 99%

Suppression of ringing artifacts in diffraction calculations

Shimobaba,

Wang,

Udjaja

et al. 2024

Optics, Photonics, and Digital Technologies for Imaging Applications VIII

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Diffraction calculations are essential in optics, including holography, optical element design, and information optics. Convolution-based diffraction calculations can be accelerated by Fourier transforms; however, they often suffer from ringing artifacts (a.k.a. Gibbs phenomena) due to the non-continuous borders of the calculation windows. Suppressing techniques for ringing artifacts have been proposed so far, but these techniques are timeconsuming and use large amounts of memory. This study presents a ringing artifact reduction using the Fresnel integrals.

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Section: Introductionmentioning

confidence: 99%

Suppression of ringing artifacts in diffraction calculations

Shimobaba,

Wang,

Udjaja

et al. 2024

Optics, Photonics, and Digital Technologies for Imaging Applications VIII

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Mitigating ringing artifacts in diffraction calculations using average subtractions

et al. 2021

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Fourier transform-based diffraction calculations are essential for computational optics. However, the diffraction calculations can be corrupted by the introduction of strong ringing artifacts due to the introduction of zero-padding to avoid circular convolution or to control the sampling intervals. We propose a simple de-ringing method using average subtractions for application to on-axis and off-axis diffraction calculations. To verify the effectiveness of the proposed method, we compared the diffracted fields obtained using zero-padding, a flat-top window method, a mirror expansion method, and the whole and border average subtractions proposed. Furthermore, we confirmed the effectiveness of the proposed method for hologram calculations using double phase encoding and image reconstructions of inline digital holography.

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Reducing ringing artifacts for hologram reconstruction by extracting patterns of ringing artifacts

Nagahama¹

2023

Opt. Continuum

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Diffraction calculation techniques based on Fourier transform, such as Fresnel diffraction, are essential in computational optics. Notably, zero padding is applied in diffraction calculations to manipulate sampling pitch and convolution calculations. However, zero padding can generate ringing artifacts due to sudden changes in value, which affect hologram reconstructions, etc. Several existing methods reduce the ringing artifact by decreasing the sudden changes in values. Therefore, in this study, we propose and validate a “ringing artifact extraction method” that focuses on the pattern of ringing artifacts, which depends on the conditions of diffraction calculation.

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Improving the phase measurement by the apodization filter in the digital holography

Cited by 3 publications

References 10 publications

Suppression of ringing artifacts in diffraction calculations

Suppression of ringing artifacts in diffraction calculations

Mitigating ringing artifacts in diffraction calculations using average subtractions

Reducing ringing artifacts for hologram reconstruction by extracting patterns of ringing artifacts

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