bluuebunny/crossref_metadata_2025 huggingface dataset:
Three-dimensional imaging diagnostics for plasmas with integral photography and deconvolution techniques
Authors: Sanpei Akio , Kai Eisaku , Himura Haruhiko , Hayashi Yasuaki , Masamune Sadao , Ohdachi Satoshi , Nagasaki Kazunobu
Published: September 2020

An integral photography and deconvolution techniques have been applied to observe plasmas, i.e. continuous translucent luminous objects. We experimentally succeeded in distinguishing the three-dimensional distribution of them from a single-exposure image obtained from one direction.
Point-by-Point Recording of Diffraction Patterns in the Photo-Magnetic Medium with Randomization of Sampling
Authors: Starobrat Joanna , Bolek Jan , Trybus Rafal Jan , Frej Antoni , Stupakiewicz Andrzej , Makowski Michal
Published: September 2020

Reconstructions of computer-generated holograms are hindered by the presence of images corresponding to higher diffraction orders. We explore the possibility of reducing their visibility by randomization of the pixel structure recorded in the photo-magnetic transparent medium.
Observation of Paramecium with Phase Retrieval Holography Using Two High-Speed Cameras
Authors: Tanaka Yohsuke , Matsushi Hiroki , Murata Shigeru
Published: September 2020

We observe paramecium, which is a single-celled protozoan, in a reconstructed volume suppressed twin image problem with phase retrieval holography using two high-speed cameras.
Overview of compact and field-portable system for resolution enhanced digital holographic microscopy by structured illumination
Authors: O’Connor Timothy , Doblas Ana , Javidi Bahram
Published: September 2020

We overview a previously reported compact and field-portable system combining shearing-based digital holography with structured illumination for resolution enhancement. The system is capable of resolution enhancement in both phase and amplitude objects.
Optical see-through integral imaging near-eye display using off-axis holographic optical element
Authors: Choi Myeong-Ho , Park Jae-Hyeung
Published: September 2020

An integral imaging near-eye display with off-axis concave mirror holographic optical element is reported. 3D image formation with focal cue is demonstrated. An aberration compensation for this tilted system will also be covered in the presentation.
Cylindrical vector beams by tailoring single polarization component
Authors: Kumar Praveen , Nishchal Naveen K.
Published: September 2020

In this paper, generation of specific inhomogeneous polarization distribution using single reflection from spatial light modulatoris demonstrated.An attempt hasbeen made to obtain cylindrical vector beams by modulation of single linear polarization component.
Digital holograms registration by means of resonant phase-shifting
Authors: Kalenkov S.G. , Kalenkov G.S.
Published: September 2020

A relation is established between the number of holograms and the quantity of the phase step at which the conjugate image and the zero order are suppressed: only the real image of the object is restored with amplification. The relation and analogy between volume Denisyuk holograms and digital holograms registered by the proposed method are discussed.
Characterization and correction of chromatic aberrations in multi-spectral digital holographic microscopy
Authors: Storm Nikolai , Barroso Alvaro , Schnekenburger Jürgen , Kemper Björn
Published: September 2020

We analyzed the chromatic aberration-induced defocus and related optical magnification changes in multi-spectral digital holographic microscopy from 500 nm to 1700 nm. We demonstrate that both effects can be compensated numerically after a single calibration.
Retinal Projection-based Near-eye Display with Polarization Grating for an Extended Eyebox
Authors: Yoo Chanhyung , Jeong Jinsoo , Lee Byoungho
Published: September 2020

We propose a novel method to switch viewpoints for retinal projection near-eye display. Without mechanical steering, the fast shift of the viewpoint position can be realized by using a polarization-dependent grating device and a polarization controller.
Experimental Verification of a Method for Single Pixel Imaging with One Dimensional Hadamard Transform and Time Division Multiplexing
Authors: Nitta Kouichi , Takigawa Atsushi , Quan Xiangyu , Matoba Osamu
Published: September 2020

A method for single pixel imaging suitable for high definition imaging is demonstrated. The experimental system consists of a laser with two dimensional scanning, a digital micro-mirror device, a condenser lens, and a photo detector. It is shown that the system can output an image with 1024 X 1024 pixels.
Evaluation of Quality of Light-Waves considering Transmission Errors for Wireless Transmission System in CGHs
Authors: Yamaguchi Kazuhiro , Sakamoto Yuji
Published: September 2020

In this paper, a wireless transmission system model for CGHs is constructed, and quality of light-waves considering transmission errors of transmitted CGHs with some kind of errors were evaluated by using computer simulations.
Unet-based for Photoacoustic Imaging Artifact Removal
Authors: Deng Jianguang , Feng Jinchao , Li Zhe , Sun Zhonghua , Jia Kebin
Published: September 2020

In photoacoustic tomography, many artifacts exist in the reconstructed images. To improve the image quality, we propose a novel architecture, dubbed SE- Unet. Superior performances are obtained comparing to back projection and the StaUnet based algorithm.
Fourier Spectra of Polarization Images of an Edge Object with Partially Coherent and Partially Polarized Light
Authors: Hu Xiaoying , Hu Shoubo , Liu Weiguo , Takeda Mitsuo , Wang Wei
Published: September 2020

Polarization imaging of an edge object illuminated with a partially coherent and partially polarized light are investigated. The corresponding Fourier spectra of the Stokes images have been given with implications for polarization image evaluations.
Improvement of closed-loop wavefront correction performance in an adaptive optics system
Authors: Zheng Yamin , Sun Chuang , Wang Deen , Huang Lei
Published: September 2020

A hybrid adaptive optics system containing a Shack-Hartmann wavefront sensor and a deflectometiy system is presented. Results show that the optimization method used in the system could help improve closed-loop wavefront correction performance.
Axial spatial resolution in Digital In-line Holography for particle tracking.
Authors: Lobera Julia , Palero Virginia , Roche Eva M. , Climente Marina Gómez , Torres Ana MLópez , Andrés Nieves , Arroyo MPilar
Published: September 2020

The axial spatial resolution is considered for different in-line configurations. Experiments with high particle seeding density show that a tilted illumination, with an aperture to eliminate the twin image, provides the best axial resolution.
Color lens-free imaging based on optimized phase estimation
Authors: Marien Jasper , Stahl Richard , Lambrechts Andy , Van Hoof Chris , Yurt Abdulkadir
Published: September 2020

We present a new image reconstruction method for color lens-free imaging (CLFI) using optimized phase estimation. This method accurately preserves sample color and delivers high-quality images useful for e.g. imaging of pathology slides.
Dynamic-range-expanded quantitative phase imaging
Authors: Toda Keiichiro , Tamamitsu Miu , Ideguchi Takuro
Published: September 2020

We demonstrate a method to adaptively expand the dynamic range of phase imaging by separately measuring a sample’s large and small phase distributions using the wavefront shaping in the dark-field configuration.
Multi-Parameters Refractive Index Sensor Based on SingleMode- Coreless- Single Mode Fiber
Authors: Yang Hongyan
Published: September 2020

A multi-parameter refractive index sensor with S-N-S structure was fabricated and sensing detection. The experiment well match theory, reaching 189nm/RIU at the refractive index of 1.330—1.419 and the transmission valley reaches -40%/RIU.
Transient Analysis of Stimulated Brillouin Scattering in a High-power Fiber Amplifier Applicable to Determination of Signal Bandwidth
Authors: Kim Byungho , Park Kyoungyoon , Jeong Yoonchan
Published: September 2020

We present a transient model of stimulated Brillouin scattering (SBS) in a high-power fiber amplifier. This model combines SBS and rate equations and is solved in time domain, using the method of characteristics. The results quantify the transient behaviors of pump, signal, and Brillouin Stokes powers, which can be a measure of signal bandwidth.
The sensitivity enhancement through the phase measurement of superposed beam.
Authors: Athira T S , Naik Dinesh N
Published: September 2020

In optical interference, unlike the phase difference, the phase of the resultant field depends on the amplitude ratio of interfering beams. A scheme is proposed where the resulting non-linearity is shown to improve the measurement sensitivity.
THz Sensing exploiting the Anomalous Extraordinary Optical Transmission in Hole Array Metasurfaces
Authors: Jauregui-Lopez Irati , Rodriguez-Ulibarri Pablo , Kuznetsov Sergei A. , Beruete Miguel
Published: September 2020

Here, we demonstrate the superior performance of the anomalous extraordinary optical transmission (EOT) resonance (compared to regular EOT) for sensing applications in the terahertz band by the deposition of a thin-film on a hole-array metasurface.
Discrete cosine transform and total variation denoising based optimization approach for pixelation removal in fiber optic imaging system
Authors: Butola Ankit , Joshi Rakesh , Usmani Kashif , Bhatt Sunil , Kanade Sheetal Raosaheb , Kumar Anand , Ahmad Azeem , Mehta Dalip Singh
Published: September 2020

Discrete cosine transform (DCT) and total variation (TV) denoising based algorithm is proposed to remove inherent honeycomb structure of fiber optic imaging system and to preserve sharp edges without sacrificing the resolution of the system.
White light interference microscopy with color fringe analysis for quantitative phase imaging and 3-D step height measurement
Authors: Mann Priyanka , singh Veena , Tayal Shilpa , Mehta Dalip Singh
Published: September 2020

Quantitative phase imaging is a label-free interferometric technique which provides high contrast images of transparent biological samples. We propose a low coherence white light interference microscopy with speckle free imaging for extracting multi-spectral information.
Correction of 3D localisation error of multiple objects in close-proximity in digital holography
Authors: Hall Matthew L , Towers Catherine E , Towers David P
Published: September 2020

Using traditional edge-detection methods, the ability to accurately localise the 3D position of a small object is hindered in the presence of multiple objects. A more accurate alternative method for 3D localisation is proposed.
Residual Fringe Visibility for Enhancing Image Contrast of Numerical Reconstruction in Digital Off-Axis Holography
Authors: Bedrossian Manuel , Wallace J. Kent , Serabyn Eugene , Lindensmith Christian
Published: September 2020

We show that background fringe pattern subtraction is a useful technique in removing static noise from off-axis holographic reconstructions and can enhance image contrast in volumetric reconstructions by an order of magnitude.
Analysis of Correlation Hyperspectral Interferometry for Measurements of Broadband Wavefronts
Authors: Kulya Maksim S. , Katkovnik Vladimir , Egiazarian Karen , Petrov Nikolay V.
Published: September 2020

The report discusses hyperspectral interferometric measurement systems for the tasks of wavefront sensing and amplitude-phase objects reconstruction. The influence of spatial and spectral phase in the interferometer arms are analyzed in numerical simulation.
Adulteration Detection in Olive Oil Using a Broad Band Light Source
Authors: Figueroa-Ramirez J. N. , Estudillo-Ayala J. M , Jauregui-Vazquez D. , Rojas-Laguna R. , Hernandez-Garcia J. C. , Sierra-Hernandez J. M. , Reyes-Ayona J. R
Published: September 2020

In this work we use two light sources in the visible range (supercontinuum and pulsed laser source) for the identification, detection and evaluation of the state of oil, based on the fluorescence spectroscopy technique.
Fresnel Imaging Model for Improved Multislice Fourier Ptychography
Authors: Schnell Knut Olav , Hasanzade Mojde , Akram Muhammad Nadeem , Breiby Dag Werner
Published: September 2020

Multislice Fourier ptychography (MFP) uses angularly diverse illumination to compute a three-dimensional image of the sample. We present an improved MFP algorithm, demonstrating better convergence properties and reduced noise in reconstructions. © 2019 The Author(s)
Towards High-Throughput Coded Aperture Compressive Spectral Imaging
Authors: Rueda-Chacon Hoover , Daniel R. Molina V. , Arguello Henry
Published: September 2020

We report on the design of a new strategy to optimize coded apertures for compressive spectral imaging so that high-throughput sensing is attained, and thus, high signal to noise ratio in the compressed measurements.
Testing of an open-path TDLAS C2H2 spectrometer on an area emitter at PTB’s 600-m-baseline
Authors: Qu Zhechao , Nwaboh Javis A. , Werhahn Olav , Ebert Volker
Published: September 2020

An open-path TDLAS spectrometer was investigated for monitoring C2H2 emission from a controlled area emitter. The diffusion effects were measured by changing the boundary conditions. Wind effects were also tested at up-to 600m pathlength.
Outperformance of Linear-regression-based Methods over Deep Learning in Optical Imaging
Authors: Jiao Shuming , Gao Yang , Feng Jun , Lei Ting , Yuan Xiaocong
Published: September 2020

Deep learning has been extensively applied in many optical imaging scenarios. But we show linear-regression-based methods may have certain outperformance in two black-box optical imaging problems that were originally solved by deep learning.
Dynamic Laser Speckle Contrast Imaging using Singular Value Decomposition
Authors: Kulkarni Rishikesh , Banoth Earu , Pal Parama
Published: September 2020

We propose an algorithm for dynamic speckle contrast imaging based on singular value decomposition. Singular values of a matrix generated with a stack of image patches are used to define correlation measure of corresponding patch.
Continuous phase-shifting holographic microscopy of micro-objects in turbid media
Authors: Kalenkov G.S.
Published: September 2020

The principal possibility of holographic registration of the micro-objects’ diffraction wave fields that passed through a turbulent medium is shown. A simple continuous phase-shifting method based on a computer-efficient fast Fourier transform algorithm allows calculating the complex field of an object with high accuracy in the presence of phase perturbations variable in time.
Tip-tilt system characterization as a tool for fiber coupling efficiency estimation
Authors: Gier Marlies , Brady Aoife , Eberhardt Ramona , Reinlein Claudia
Published: September 2020

The measured fiber coupling efficiency (FCE) in atmospheric laser communication is not fully explored. We experimentally study the FCE for tip-tilt aberrations. Finally, we explain the FCE with the tip-tilt phase response.
High-resolution quantitative phase imaging using deep neural network
Authors: Kanade Sheetal Raosaheb , Butola Ankit , Bhatt Sunil , Kumar Anand , Mehta Dalip Singh
Published: September 2020

We demonstrate high-resolution in quantitative phase imaging using deep neural network. We improve the resolution of human RBC phase maps acquired by low numerical-aperture (NA), to achieve comparable resolution that of high NA objective lens.
Phase Retrieval for Hidden Tomography Reconstruction
Authors: Ancora Daniele , Di Battista Diego , Vidal Asier Marcos , Avtzi Stella , Zacharakis Giannis , Bassi Andrea
Published: September 2020

We discuss the problem of tomographic reconstruction of fluorescent objects hidden behind random media. To accomplish this, we focus on the properties of the autocorrelation, relying on phase retrieval algorithms to perform 3D reconstruction.
Tomographic incoherent digital holography using a lattice light-sheet microscope
Authors: Potcoava Mariana , Mann Christopher , Art John , Alford Simon
Published: September 2020

We present tomographic fluorescence imaging using an incoherent detection technique on a lattice light-sheet microscope (LLSM) without moving sample stage or the detection objective. The system provides an adaptable low excitation and high-resolution 3D image.
Light Sheet Fluorescence Microscopy of the Trabecular Meshwork in Rodent Eyes
Authors: Suchand Sandeep C. S. , Barathi Veluchamy Amutha , Aung Tin , Baskaran Mani , Matham Murukeshan Vadakke
Published: September 2020

Trabecular meshwork of the eye in Wistar rats was imaged using high-resolution, noncontact mode Bessel beam light sheet fluorescence microscopy. Distinct features of the trabecular meshwork can be observed using this technique.
Quantitative Phase Imaging of Embedded Scattering Surfaces by Synthetic Optical Holography
Authors: Di Donato A. , Criante L. , Mencarelli D. , Pierantoni L. , Morini A. , Farina M.
Published: September 2020

We describe the implementation of quantitative phase imaging in a lens-free scanning system based on low-coherence synthetic optical holography. We show the imaging of rough scattering surfaces embedded in a microfluidic channel.
A Computational Aperture Stop for Optical Fiber Bundles
Authors: Orth Antony , Ploschner Martin , Wilson Emma R. , Maksymov Ivan , Gibson Brant C.
Published: September 2020

Optical fiber bundles are flexible image conduits used for endoscopy. We will discuss how the angular sensitivity of the bundle’s waveguiding cores can be leveraged for computational imaging.
Characterization of the polarization of ultrafast vector beams in the spatiotemporal domain
Authors: Alonso Benjamín , Lopez-Quintas Ignacio , Holgado Warein , Drevinskas Rokas , Kazansky Peter G. , Hernández-García Carlos , Sola Íñigo J.
Published: September 2020

We perform a complete measurement of ultrashort pulsed beams where the polarization evolves spatially and temporally. We apply our technique to characterize ultrafast shaped vector beams combining temporal polarization gating and radial polarization.
Measuring ultrashort laser pulses with amplitude swing
Authors: Alonso Benjamin , Holgado Warein , Sola Inigo J.
Published: September 2020

We present a new concept for temporal pulse measurement, the amplitude swing, based on the amplihrde variation of two delayed pulse replicas. The in-line compact set-up is versatile for pulses with different durations and bandwidths.
Fundamental speed limit of dynamic Brillouin fiber sensing
Authors: Murray Joseph B. , Redding Brandon
Published: September 2020

We present a previously undescribed fundamental limit to dynamic Brillouin strain sensing resulting from strain induced non-local Doppler frequency shifts. We demonstrate how to surpass this limit using dual gain and loss probes.
Investigating ground layer and dome turbulence in astronomical observatories using a localized optical turbulence sensor.
Authors: Lai Olivier , Withington J. Kanoa , Chun Mark R. , Laugier Romain
Published: September 2020

We have developed a turbulence sensor to study image degradation in domes of astronomical observatories. A prototype has already been deployed at sites such as CFHT, UH88” and LBT, revealing the effects of minute temperature differences, dome venting and the amplification of non-Kolmogorov turbulence by adaptive optics.
Interlaced phase screen and convolution operators: an efficient modeling and computational tool for ELT-sized Adaptive Optics systems
Authors: Raynaud Henri-François , Kulcsár Caroline
Published: September 2020

An interlacing procedure enabling to construct spatially invariant models of ELT-sized AO systems and atmospheric turbulence involving different spatial resolutions is presented. This approach enables to perform highly parallelizable off-line and on-line computations.
Dome Seeing Measurements at the Isaac Newton Telescope
Authors: Gladysz Szymon , Lambert Andrew , Kociok Thomas , Sprung Detlev , Sucher Erik , Stein Karin
Published: September 2020

We report on results of the field trial carried out in the dome of the 2.5 m Isaac Newton Telescope on the island of La Palma (Canary Islands, Spain). The goal of the trial was to characterize optical hrrbulence in the confined space of the observatory.
Real-time 1.5 kHz adaptive optical to correct for atmospheric turbulence.
Authors: Kudryashov A.V. , Rukosuev A.L. , Nikitin A.N. , Galaktionov I.V. , Sheldakova J.V.
Published: September 2020

Experiments and numerical simulations of the phase correction of laser beam turbulent distortions have been carried out by using the adaptive optical system with the bandwidth of 1500 Hz. Adaptive system included Shack-Hartmann wavefront sensor based on fast 4 kHz CMOS camera with the lenslet spatial resolution 20x20 lenslets, high-resolution bimorph deformable mirror with first resonance frequency of 7 kHz and FPGA-based controller to elaborate signals to correct for the input phase fluctuations. It has been shown that the bandwidth of adaptive optical system should be an order of magnitude greater than the bandwidth of the turbulent distortions for the effective correction.
Satellite Laser Communication and Adaptive Optics
Authors: Roberts Lewis C.
Published: September 2020

Adaptive optics enables higher data rates for satellite laser communication. It has recently been demonstrated and several future missions will use AO. There are challenges that AO needs to address to be widely used.
Large Adaptive Secondary Mirrors for Ground-based Astronomy
Authors: Bosa Arjo , Kuipera Stefan , Dekkera Bert , Jonkera Wouter , Maniscalcoa Matthew , Chunb Mark , Priemc Hans
Published: September 2020

TNO and industrial partners are developing a new type of Adaptive Secondaty Mirror (ASM) technology enabling affordable and reliable ASMs for the world’s larger telescopes as well as the telescopes in the 2-4 meter class. To demonstrate this technology, an ASM is being developed for the University of Hawaii’s 2.2-meter telescope.
Vectorial adaptive optics - correction of polarization and phase
Authors: He Chao , Hu Qi , Dai Yuanyuan , Booth Martin J.
Published: September 2020

We extend adaptive optics concepts to correction of both polarization and phase errors. These vectorial adaptive optics methods encompass sensor- based and sensorless methods and are implemented with multiple adaptive elements. Applications include microscopy and endoscopy.
Focal plane wavefront sensing using (mostly) non-redundant aperture masking
Authors: Bharmal Nazim Ali , Leah Susannah , Morris Simon
Published: September 2020

Ideally focal plane wavefront sensing is achromatic and linear, benefiting from higher SNR intensity changes than pupil wavefront sensing provides. We report on initial focal plane WFS experiments with these ideal characteristics.
Adaptive Optics Visual Simulators: New tools for a complete and customized vision evaluation
Authors: Paniagua-Diaz Alba Maria , Artal Pablo
Published: September 2020

In this work we present the Adaptive Optics Visual Simulator (VAO) and show the potential of Adaptive Optics in visual diagnostic and simulation, for a complete and fully personalized vision characterization.
A Universal Framework for Microscope Adaptive Optics
Authors: Hu Qi , Antonello Jacopo , Booth Martin J.
Published: September 2020

Adaptive optics (AO) microscopy will become more widespread with useable transferable methods. We are therefore creating theoretical and practical frameworks that tie together AO concepts and provide broadly applicable tools for sensorless AO in microscopy.
Focusing Through Scattering Materials Using Deep Neural Networks
Authors: Vishniakou Ivan , Seelig Johannes D.
Published: September 2020

Neural networks offer novel approaches for light control in microscopy. We compare different deep neural network architectures for focusing through scattering materials for applications in biological imaging.
Engineered Texture Phantom for Measuring Lateral Resolution of Adaptive Optics Ophthalmic Imaging Systems
Authors: Agrawal Anant , Lamont Andrew C. , Liu Zhuolin , Sochol Ryan , Hammer Daniel X.
Published: September 2020

We fabricated and evaluated a novel phantom with biologically-relevant feahrre dimensions to rapidly characterize the lateral spatial resolution of adaptive optics systems for imaging the human retina.
Photomechanical materials and applications: a tutorial
Authors: Kuzyk Mark G. , Dawson Nathan J.
Published: September 2020

The transistor has revolutionized civilization. The photon will enable the next revolution provided that photomechanical materials, which convert light energy into mechanical work, can be made substantially more efficient. This tutorial develops a unified picture of the photomechanical response from its microscopic origins to the bulk response. A statistical model of the relationship between the photomorphon, the smallest photomechanical material unit, and the bulk response provides the context for understanding the various mechanisms that can contribute. We then present experimental details of how the photomechanical response is measured and used to deduce the underlying mechanisms. A figure of merit for the photomechanical efficiency is defined and materials are reviewed. Finally, we describe the photomechanical optical device (POD) and how PODs can be combined to form highly intelligent materials. This tutorial spans the multidisciplinary topics needed to (1) understand the fundamental physics of the response, (2) design and process materials to control the response, and (3) build new devices and integrated photomechanical systems.
Resonant microoptics for enhanced computational imaging and sensing solutions
Authors: Sinzinger Stefan , Hentschel M.
Published: September 2020

Optimized imaging and sensing systems require specialized optical elements and systems integration. This is specifically true for computational imaging systems where both the illumination as well as the imaging systems need to be controlled in a precisely defined manner. Micro- and nanostruchrred elements provide additional degrees of freedom for this purpose. We discuss novel approaches for sophisticated system solutions as well as new microoptical elements for wavefield control based on optical microresonators.
Towards a vectorial treatment of Fourier ptychographic microscopy
Authors: Dai Xiang , Konda Pavan Chanda , Xu Shiqi , Horstmeyer Roarke W.
Published: September 2020

We present a new imaging technique that captures and reconstructs the complex-valued polarization-dependent properties of a sample in a Jones matrix formalism at an extended resolution through the acquisition of multiple intensity-only measurements.
Dual-wavelength cell’s refractive index analysis with partially coherent optical diffraction tomography
Authors: Soto J. M. , Rodrigo J. A. , Alieva T.
Published: September 2020

We demonstrate that the partially coherent optical diffraction tomography is sensitive to the refractive index dispersion of cells for the wavelength 560 nm and 630 nm.
Parallel Acquisition of Multiple Images Using Coherence Gating in Off-Axis Dark-Field Digital Holographic Microscope for Semiconductor Metrology
Authors: Messinis C. , van Schaijk T.T.M. , Tenner V.T. , de Boer J.F. , Witte S. , Boef A.J. den
Published: September 2020

We present an Off-Axis dark-field digital holographic microscope capable of parallel acquisition of multiple holograms. With this microscope we aim to measure overlay (OV) with sub-nanometer precision and milli-second acquisition times over large wavelength range.
Entanglement-enabled quantum holography
Authors: Defienne Hugo , Ndagano Bienvenu , Lyons Ashley , Faccio Daniele
Published: September 2020

We introduce a holographic imaging concept that is conditioned on photonic entanglement. We show that entanglement-encoded phase images can be retrieved through dynamic phase disorder and in the presence of classical noise, with practical advantage over classical holography.
Imaging high-dimensional entanglement correlations with a SPAD camera
Authors: Ndagano Bienvenu , Defienne Hugo , Lyons Ashley , Starshynov Ilya , Villa Federica , Tisa Simone , Faccio Daniele
Published: September 2020

Here we present the reconstruction of hvo-photon spatial entanglement correlations using a single-photon avalanche diode (SPAD) camera. Owing to its high frame rate, our SPAD camera provides a 1000x speed-up in the data acquisition time compared to CCD-based single-photon cameras, effectively reducing measurement time from many hours to just a few minutes.
Toward photoelastic sensors: a hybrid proposal for imaging the stress field through load stepping methods
Authors: Briñez-de León Juan C. , Branch John W. , Restrepo-M Alejandro
Published: September 2020

Extending photoelasticity studies to industrial applications, such as
photoelastic sensors, implies to overcome limitations like need of
experts, experimental over-calibration, or reduced number of
experiments. This paper introduces a computational hybrid technique
toward this goal.
Intensity interferometry-based depth ranging
Authors: Wagner Fabian , Schiffers Florian , Willomitzer Florian , Cossairt Oliver , Velten Andreas
Published: September 2020

This paper demonstrates range imaging based on intensity interferometry with real thermal light. Advantages like robustness to atmospheric scattering or autonomy by exploiting external light sources make this approach interesting for future applications.
Sub-diffractive spatial information retrieval from far-field images
Authors: Buijs Robin D. , Schilder Nick J. , Wolterink Tom A. W. , Gerini Giampiero , Koenderink A. Femius , Verhagen Ewold
Published: September 2020

We investigate how partial knowledge of scattering nanostructures enables extraction of spatial information from far-field radiation patterns. A reconstruction technique based on singular value decomposition allows localisation of a point-like light source with nanoscale resolution.
Contrast-based Phase Angle of Polarization Image Construction Using Poisson Image Editing
Authors: Kruse Andrew W. , Alenin Andrey S. , Tyo Scott
Published: September 2020

Techniques similar to Poisson Image Editing are used to construct a grayscale image representing the phase angle of polarization which produces consistent, high-contrast images for enhanced visual analysis of data from polarization imaging.
Real-Time Unknown-View Tomography Using Recurrent Neural Networks with Applications to Keyhole Imaging
Authors: Metzler Christopher A. , Wetzstein Gordon
Published: September 2020

Unknown-view tomography is an important but computationally intensive reconstruction problem. We demonstrate that recurrent neural networks (RNNs) can perform unknown-view tomography in real time and validate our solution on simulated non-line-of- sight imaging-through-a-keyhole data.
Foveated Non-line-of-sight Imaging
Authors: Dave Akshat , Balaji Muralidhar Madabhushi , Rangarajan Prasanna , Veeraraghavan Ashok , Christensen Marc P
Published: September 2020

Existing non-line-of-sight imaging techniques suffer from a tradeoff between field of view and spatial resolution. We propose an imaging system that tackles this tradeoff by efficiently combining information from transient imaging and correlography subsystems.
Multimodal endo-microscopy using multimode fibers
Authors: Caravaca-Aguirre Antonio M.
Published: September 2020

We present and discuss the recent advances to use multimode fibers for multimodal endo-microscopy and its implementation for in-vivo imaging.
Single-shot 3D Imaging Using Speckle Correlations
Authors: Aarav Shaurya , Fleischer Jason W
Published: September 2020

We add a point-source reference to generalize speckle correlation imaging to three dimensions. The method uses shift-invariance in both transverse and axial directions to quantitatively recover the position, size, and depth of multiple objects.
Extended depth-of-field lensless camera using a radial amplitude mask
Authors: Nakamura Tomoya , Igarashi Shunsuke , Torashima Shiho , Yamaguchi Masahiro
Published: September 2020

We propose a novel lensless camera equipping a radial amplitude mask for realizing extended depth-of-field imaging. Here we report simulation results of depth invariant point spread function and extended depth-of-field imaging.
Robust Feature Detection using Pupil Function Engineering
Authors: Silveira Paulo E. X. , Narayanswamy Ram
Published: September 2020

We apply the FAST feature detection algorithm to images captured using imaging systems with engineered pupil functions, thereby experimentally demonstrating that computer vision and SLAM can benefit from the use of computational imaging.
Compressive Rolling Shutter Camera Array
Authors: Guzmán Felipe , Vera Esteban
Published: September 2020

We propose a CMOS-camera array architecture exploiting rolling shutter diversity to generate a compressive forward model that can increase the temporal resolution of the sensed data.
A Deep Learning Approach for Reconstruction in Temporal Compressed Imaging
Authors: Zhang Linxia , Ke Jun , Lam Edmund Y
Published: September 2020

We discuss a deep network for temporal compressed imaging. The data collected by an experimental platform are used for training and testing. Spatial variant point spread functions are calibrated for reconstruction.
Model-based Inversion Methods for Compressive Spectral Imaging with Diffractive Lenses
Authors: Dogan Didem , Oktem Figen S.
Published: September 2020

We develop novel model-based inversion methods for compressive spectral imaging with diffractive lenses. These fast image reconstruction methods, exploiting data- adaptive convolutional dictionaries and sparsifying transforms, are applicable to any computational imaging problem with convolutional models.
Snapshot hyperspectral imaging using a random phase mask and spectral filter array
Authors: Monakhova Kristina , Yanny Kyrollos , Waller Laura
Published: September 2020

We introduce a snapshot hyperspectral imager that uses a random phase mask, repeated spectral filter array, and compressive recovery to achieve high spatial and spectral resolution in a small form factor.
Single-fiber Computational Endoscopic Imaging
Authors: Ren Liyong , Xu Chengfang
Published: September 2020

By obtaining transmission matrix (TM) of multimode optical fiber (MMF) working in reflective mode, objects can be computationally reconstructed from their speckle fields. This method shows potential applications for wide-field and ultrathin single-fiber endoscopic imaging.
True Volumetric Measurements of Cells and Tissues by Limited Angle Holographic Tomography
Authors: Kujawinska Malgorzata , Krauze Wojciech
Published: September 2020

The processing pipeline based on a finite object support for achieving tnre volumetric measurements by means of limited angle holographic tomography is presented. Its main modules are described and examples of its implementation are given.
Engineered Depth of Field in Coded Aperture Imaging
Authors: Rai Mani Ratnam , Rosen Joseph
Published: September 2020

Sparse point responses with sculptured axial curves are implemented in the interferenceless coded aperture correlation holography (I-COACH) system to extend, and even to engineer, the depth of field of imaging systems in various ways.
Sensitivity in DPC: Assessing the Limits
Authors: Bonati Chiara , Laforest Timothe , Kunzi Mathieu , Moser Christophe
Published: September 2020

A simple method to accurately assess the sensitivity of a DPC sehrp is described, based on the optical parameters of the setup and the noise characteristics of the camera. Experiments validate the theoiy.
Standardization of Holographic Compression: JPEG Pleno
Authors: Schelkens Peter , Gilles Antonin , Mahmoudpour Saeed , Oh Kwan-Jung , Perra Cristian , Pinheiro Antonio
Published: September 2020

JPEG Pleno is a standardization framework addressing the compression and signalling of plenoptic modalities. While the standardization of solutions to handle light field content is currently reaching its final stage, the JPEG committee is now preparing for the standardization of solutions targeting point cloud and holographic modalities. This paper addresses the challenges related to the standardization of compression technologies for holographic content and associated test methodologies.
Label-free biochemical refractive-index tomography of single cells with mid-infrared photothermal effect
Authors: Tamamitsu Miu , Toda Keiichiro , Shimada Hiroyuki , Nagashima Yu , Horisaki Ryoichi , Ideguchi Takuro
Published: September 2020

We demonstrate simultaneous, in-situ and depth-resolved acquisition of label-free biochemical and refractive-index contrasts of single cells by sensing mid-infrared photothermal effect with optical diffraction tomography.
Phase Retrieval using Transport of Intensity with Off-axis Digital Holography for Objects with Large Phase Excursions
Authors: Zhou Haowen , Stoykova Elena , Banerjee Partha P.
Published: September 2020

The direct phase retrieval for objects with large phase excursions using the transport-of- intensity equation with off-axis digital holography is single-shot, avoids phase unwrapping, and uses one of the twin images.
A Generalized Approach for Digital Holographic Recording and Reconstruction
Authors: Bazow Brad , Phan Thuc , Raub Christopher B. , Nehmetallah George
Published: September 2020

A generalized approach for high-fidelity simulation of digital holographic recording and reconstruction of several complex field objects recorded through various holographic setups. The goal is to use synthesized databases as ground-truth to train machine-learning algorithms.
Digital Reconstruction of large horizontal parallax digital holograms
Authors: Kozacki Tomasz , Finke Weronika , Martinez-Carranza Juan
Published: September 2020

An Angular Spectrum-based method that allows for reconstruction of digital holograms having large horizontal parallax is developed. It has high efficiency of calculations in terms of speed and memory used. Experimental verification is provided.
Gaussian or speckle noise in digital holographic interferometry: which influence on the assessment of de-noising algorithms?
Authors: Montresor Silvio , Picart Pascal
Published: September 2020

This paper discusses on the influence of the noise statistics from the point of view of the performances of de-noising algorithms in digital holographic interferometry. Particularly we focus on Gaussian and speckle noise statistics. Comparisons are based when considering 32 de- noising algorithms and the global rms phase error obtained after processing. The paper demonstrates that Gaussian statistics are not the accurate model for describing noise in digital holographic interferometry.
DHMx (Digital Holographic Microscope Experience) Software Tool
Authors: Fregoso S. Felipe , Lima Frank , Wallace J. Kent , Bedrossian Manuel , Mckeithen Dylan , Kettenbeil Christian , Loya Frank , Lindensmith Christian
Published: September 2020

The DHMx (Digital Holographic Microscope Experience) is an open-source software suite designed to perform reconstructions from off-axis holograms obtained from either a real-time stream or from disk with a graphical interface for commanding and display.
Approaches for simultaneous holographic multicolor motion-picture-microscopy sensing of multiple natural light sources
Authors: Tahara Tatsuki , Ito Tomoyoshi , Okamoto Ryo , Wakunami Koki , Ichihashi Yasuyuki , Oi Ryutaro
Published: September 2020

We present approaches for simultaneous, holographic, and microscopic multicolor motion-picture sensing of multiple natural light sources. We utilize single-shot incoherent digital holography with a polarization-imaging sensor, phase-shifting interferometry, and computational coherent superposition (CCS) as approaches.
Compressive holography for multilayer imaging
Authors: Su Ping , Luo Zhenpeng , Ma Jianshe
Published: September 2020

Compressive sensing (CS) is employed in holographic imaging for multilayer imaging. We show tomography of a continuous sample by introducing a microscope objective (MO) in an in-line compressive holographic system, and analyze the reasons why applying compressive holographic microscopy can achieve tomography of continuous samples.
Using a Digital Filter in Incoherent Digital Holography to Improve the Quality of Reconstructed Images
Authors: Muroi Tetsuhiko , Nobukawa Teruyoshi , Katano Yutaro , Kinoshita Nobuhiro , Ishii Norihiko
Published: September 2020

In incoherent digital holography, the reconstructed image is strongly affected by noise on the interference fringes. We investigated a means of noise reduction that reduces the degradation of the high spatial frequency components in the reconstructed image. In particular, we applied a 5x5 tap digital filter to the interference fringes. By optimizing the filter, the noise level could be made uniform and the contrast at high spatial frequencies could be made twice that of using a mean filter. We found that a digital filter can improve the quality of reconstructed images in incoherent digital holography.
Single-shot incoherent color digital holographic microscopy system without a spatial light modulator
Authors: Tahara Tatsuki , Ito Tomoyoshi , Ichihashi Yasuyuki , Oi Ryutaro
Published: September 2020

We present an incoherent color digital holographic microscope for single-shot multicolor three-dimensional imaging of microscopic specimens. The system does not require any spatial light modulator and light-use efficiency is improved due to no beam splitter.
Color aberration corrected single-shot full-color incoherent holography
Authors: Choi Kihong , Hong Keehoon , Yeom Han-Ju , Park Joongki
Published: September 2020

The single-shot full-color incoherent holography based on the geometric phase is introduced. Especially, this system resolves the color dispersion effect of the geometric phase lens by the nature of the holographic recording.
Simultaneous recording of multiple motion picture of 3D image of polarized light propagation
Authors: Inoue Tomoyoshi , Nishio Kenzo , Awatsuji Yasuhiro
Published: September 2020

We succeeded in simultaneously recording of four motion pictures of three-dimensional image of the polarized light propagation. The motion pictures were obtained by digital light-inflight holography. The actual time of the pictures were 17.6 ps.
Generalized diffraction calculation method for holography and diffractive optics
Authors: ZHANG Wenhui , ZHANG Hao , JIN Guofan
Published: September 2020

A diffraction calculation method, where the propagation distance and sampling parameters of the diffraction field can be flexibly adjusted, is proposed for computing wave propagation in holography and diffractive optics with high accuracy and efficiency.
Noise suppression for double-phase hologram by resampled macro-pixel encoding
Authors: Sui Xiaomeng , Cao Liangcai , Jin Guofan
Published: September 2020

A resampled macro-pixel double-phase method to encode complex holograms is proposed. The reconstruction noise of the double-phase holograms is suppressed with the same hologram size, which is validated in numerical simulations and optical experiments.
Bicubic interpolation-extrapolation for high resolution single-exposure digital holography
Authors: Huang Zhengzhong , Cao Liangcai
Published: September 2020

The resolution of the reconstructed image is greatly limited by the pixelated detectors for the diffraction-limited holographic imaging. This work proposes a bicubic interpolationextrapolation method to compensate the limited size of the digital hologram.
Inverse-problem based algorithm for THz off-axis digital holography reconstruction
Authors: Zhao Yuchen , Kirkove Murielle , Georges Marc P.
Published: September 2020

We apply an inverse-problem-based reconstruction technique to off-axis THz digital holography. Off-axis digital holography configuration at THz regime suffers from non-ideal recording conditions due to the large wavelength. The proposed method takes into account the non-uniformity of the reference wavefront. Compared to the direct Fourier filtering reconstruction, our method reduces the standard deviation of the reconstructed phase.
Efficient numerical processing of off-axis digital holographic images
Authors: Wallacei J. Kent , Bedrossian Manuel
Published: September 2020

Numerical reconstruction of digital holographic images can be inefficient in cases of a limited region of interest in the image plane. Here we show a discrete Fourier transform can be computationally faster than traditional methods.
Spatial Light Modulator-Based Maskless Holographic Lithography on Nonplanar Surfaces
Authors: Fischer David , Sinzinger Stefan
Published: September 2020

For maskless wide field microlithography on nonplanar surfaces we de scribe the extension of a maskless holographic SLM-based lithography system by a surface measurement method. A phase-only LCoS-SLM is used for projection of patterns and a camera to determine the surface orientation from the defocused patterns.
Interferometric Measurement of Refractive Index Change of Tumor Cells Under Electrical Fields
Authors: Varol Rahmetullah , Omeroglu Sevde , Yilmaz Abdurrahim , Oruc Muhammed Enes , Esmer Gokhan Bora , Uvet Huseyin
Published: September 2020

This work proposes an interferometric method to simultenously measure the refractive index change and thickness of live cells under applied electrical fields. It may allow practical and accurate assessment of intracellular response to electrical stimulation.
Holographic imaging of particles with Lloyd’s mirror interferometer
Authors: Schnitzler Lena , Kleemann Navina , Neutsch Krisztian , Hofmann Martin R. , Gerhardt Nils C.
Published: September 2020

We present a holographic microscope for particle detection based on Lloyd’s mirror configuration. It provides a simple and compact setup with high phase sensitivity and a high stability due to its common-path and self-referencing system.
Identification and Size Estimation of Non-Spherical Nanoparticles using Polarization-Resolved Holography
Authors: Öhman Johan , Sjödahl Mikael
Published: September 2020

Dual-view polarization-resolved digital holography is used to record the polarization response of the scattered light from both spherical and non-spherical nanoparticles. A model based on the T-matrix method is developed to map the polarization to a size estimate of the volume equivalent radius.
Holographic data compression for holographic microscopy and tomography in biomedical applications
Authors: Muhamad Raees Kizhakkumkara , Stępień Piotr , Blinder David , Schelkens Peter , Kujawińska Małgorzata
Published: September 2020

Lossy/lossless compression schemes utilizing traditional image/video codecs for compression of image plane off-axis holograms are proposed for biomedical applications. The influence on metrological accuracy of digital holographic microscopy and holographic tomography is analyzed.
Numerical dark field illumination for digital lensless holographic microscopy of biological samples
Authors: Trujillo C. , Garcia-Sucerquia J.
Published: September 2020

The implementation of a numerical darkfield illumination to obtain reconstructions with enhanced contrast in DLHM is presented. This proposal has been validated using experimental holograms of a microorganism in pond water.
Fast-iterative blind reconstruction algorithms for accurate quantitative phase images in phase-shifting digital holographic microscopy
Authors: Castaneda Raul , Buitrago Carlos , Garcia-Sucerquia Jorge , Robinson Aaron , Doblas Ana
Published: September 2020

We present two blind-iterative phase-shifting algorithms for accurate quantitative phase images in phase-shifting digital holographic microscopy. Both methods are based on the demodulation of the different components of the Fourier spectrum of the holograms.
Speckle Reduction in Digital Holographic Microscopy by Physical Manipulation of the Pupil Function
Authors: Buitrago-Duque Carlos , Garcia-Sucerquia Jorge
Published: September 2020

Speckle reduction on phase-maps from digital holographic microscopy by physically modifying the imaging pupil of the microscope is presented. The speckle decorrelation degree caused by size and position variations is studied. The method is applied to both simulated and experimental results as validation.
Automatic Detection of Microplastics by Deep Learning Enabled Digital Holography
Authors: Zhu Yanmin , Yeung Chok Hang , Lam Edmund Y.
Published: September 2020

An inline digital holography with deep learning is developed to detect microplastics automatically from the raw holograms, without any additional image processing and analysis.