Speckle Reduction by Spatial-Domain Mask in Digital Holography

Fukuoka, Takahiko; Mori, Yutaka; Nomura, Takanori

doi:10.1109/jdt.2015.2479646

Cited by 45 publications

(12 citation statements)

References 26 publications

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“…In this study, the method has been extended to imaging grayscale objects by combining many signal processing tools, namely, nonlinear filter, [ 38 ] correlation filter, low‐pass filter, median filter, and spatial domain mask method. [ 44 ] This technique converts a monochrome high‐speed camera into a high‐speed color 3D camera, enabling the recording of complete information of a fast transient event and the possibility of spatial and spectral time correlation studies. The article consists of four sections.…”

Section: Coherent and Incoherent Multidimensional Holography: Definitmentioning

confidence: 99%

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Anand

Katkus

et al. 2020

Advanced Photonics Research

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Fast transient phenomena such as light–matter interactions, rapid electrical discharge, light scattering in tissues, and biochemical reactions that generate light signatures can be studied using high‐speed cameras. Herein, a lensless, single camera shot, spatio‐spectral‐temporal imaging technique based on chaotic waves is proposed and demonstrated. A random pinhole array is used as a chaotic wave generator to map every color point source in the object space to a unique random distribution. The spatio‐spectral signatures are recorded for two cases using a monochrome high‐speed camera, and an extensive library of spatio‐spectral signatures is synthesized by computational interpolation and extrapolation using the scaling factors of the Fresnel propagators. A spark generated by an abrupt electrical discharge is converted into a chaotic wave using the same pinhole array, and the hologram is recorded using the monochrome high‐speed camera in time. The recorded hologram of the spark is decomposed into spatio‐spectral 4D events in time with a temporal resolution of 40 μs using the semisynthetic spatio‐spectral signatures.

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Section: Coherent and Incoherent Multidimensional Holography: Definitmentioning

confidence: 99%

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Anand

Katkus

et al. 2020

Advanced Photonics Research

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“…Based on the above analyses, it is essential to study a digital processing method to reduce the effect of coherent noise without a loss of spatial resolution, which provides a facility for real-time Compared to the approach proposed by Hincapie [114], the speckle reduction by spatial-domain mask, presented by Fukuoka et al [115] in 2016, permitted the spatial-domain mask to overlap, which released the limit of the available number of the images to be synthesized. A number of reconstructed images were obtained by shifting a digital aperture in the original hologram.…”

Section: Coherent Noise Suppressionmentioning

confidence: 99%

Recent Progress on Aberration Compensation and Coherent Noise Suppression in Digital Holography

Liu

Wang

2018

Applied Sciences

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Digital holographic microscopy (DHM) is a topographic measurement technique that permits full-field, nondestructive, dynamic, quantitative amplitude, and phase-contrast imaging. The technique may realize the lateral resolution with submicron scale and the longitudinal resolution with subnanometer scale, respectively. Improving imaging quality has always been the research focus in DHM since it has a direct effect on the precise topographic measurement. In this paper, the recent progress on phase aberration compensation and coherent noise suppression is reviewed. Included in this review are the hologram spectrum's centering judgment methods of side band in tilt phase error compensation, the physical and numerical compensation methods in phase aberration compensation, and the single-shot digital process methods in coherent noise suppression. The summaries and analyses for these approaches can contribute to improving the imaging quality and reducing the measurement error of DHM, which will further promote the wider applications of DHM in the topographic measurement fields, such as biology and micro-electro mechanical systems.

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“…In this work, an optical multi-look method in which the multiple speckle fields are obtained by physically altering the pupil function of the imaging system is implemented in Digital Holographic Microscopy (DHM). The manipulation of the imaging pupil is a denoising strategy that has been widely reported in optical holography [15,16,17,18,19,20,21], and also numerically implemented in its digital counterpart [22,23]; however, the existing literature has been mostly interested in the denoising of intensity reconstructions. The digital world has given holography the ability to directly access the phase information of the samples, enabling the development of label-free quantitative phase imaging (QPI) techniques [24]; DHM directly benefits from this capability as it allows an ample range of applications, for instance in the biological sciences, where most samples are both of micrometric dimensions and translucent [25], thus encoding their parameters in the phase information.…”

Section: Introductionmentioning

confidence: 99%

Physical pupil manipulation for speckle reduction in digital holographic microscopy

Buitrago-Duque

Garcı́a-Sucerquia

2021

Heliyon

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The reduction of speckle noise by physically changing the pupil of the imaging system, as first envisioned in optical holography, is experimentally applied to a digital holographic microscope (DHM). The imaging pupil of a DHM, operating in image plane telecentric-afocal architecture, is changed in a controlled way between successive recordings, allowing the shooting of multiple partially-decorrelated holograms. Averaging the numerically reconstructed holograms yields amplitude and/or phase images with reduced speckle noise. Experimental results of biological specimens and a phase-only resolution test show the feasibility to recover micron-sized features in images with reduced speckle noise.

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Speckle Reduction by Spatial-Domain Mask in Digital Holography

Cited by 45 publications

References 26 publications

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Recent Progress on Aberration Compensation and Coherent Noise Suppression in Digital Holography

Physical pupil manipulation for speckle reduction in digital holographic microscopy

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