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44-2: Viewing Window Extension in Integral imaging Based Head-mounted Light Field displays using Time-Multiplexed Method

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SId Symposium digest of Technical Papers 2023年第1期54卷

作者： Cheng-Ting Huang Hong Hua 3D Visualization and Imaging Systems Laboratory College of Optical Science The University of Arizona 1630 E University Blvd. Tucson AZ 85721

Conventional integral imaging based head-mounted light field display systems suffer from a small viewing window to minimize crosstalk artifacts and achieve a balanced optical performance. In this paper, we present a m... 详细信息

关键词： Integral imaging Light field display Head-mounted display Time-multiplexed method

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44-1:Invited Paper:Review on Time-Multiplexed Methods for High-Performance Head-Mounted Light Field displays

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SId Symposium digest of Technical Papers 2023年第1期54卷

作者： Hong Hua Hekun Huang Xuan Wang 3D Visualization and Imaging Systems Laboratory College of Optical Science The University of Arizona 1630 E University Blvd. Tucson AZ USA 85721

Conventional integral-imaging based light field displays are often subject to the tradeoffs among spatial resolution, depth of field, view density, and eyebox size. This paper will review several time-multiplexed meth...

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imaging of dendrites and sparse interneuronal networks with 3d random access microscopy

Imaging of dendrites and sparse interneuronal networks with ...

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Optics and the Brain, BRAIN 2023 - Part of Optica Biophotonics Congress: Optics in the Life Sciences 2023

作者： Rózsa, Balázs Szadai, Zoltán Judák, Linda Chiovini, Balázs Juhász, Gábor Ócsai, Katalin Pálfi, dénes Mezriczky, Zsolt Szalay, Gergely Katona, Gergely Mihály, Anna Szepesi, Áron Mucsi, Zoltán Roska, Botond Pi, Hyun-Jae Chevy, Quentin Albeanu, Florin Kepecs, Adam Laboratory of 3D functional network and dendritic imaging Institute of Experimental Medicine Budapest1083 Hungary Two-photon measurement technology group The Faculty of Information Technology Pázmány Péter University Budapest Hungary Brain Vision Center Budapest Hungary János Szentágothai Doctoral School of Neurosciences Semmelweis University Budapest Hungary Institute of Molecular and Clinical Ophthalmology Basel Basel Switzerland Neural Circuit Laboratories Friedrich Miescher Institute Basel Switzerland Department of Ophthalmology University of Basel Basel Switzerland Cold Spring Harbor Laboratory Cold Spring HarborNY United States Volen Center for Complex Systems Biology Department Brandeis University WalthamMA United States Departments of Neuroscience and Psychiatry Washington University School of Medicine St. LouisMO United States

ISBN: (纸本)9781957171210

Acousto-optical microscopy is a powerful tool to study spare networks and extensive dendritic arborization from the cortex of behaving animals. We used this novel approach for imaging dendrites and somata of sparse interneuron populations in a combination with auditory discrimination and detection tasks. Our results shed light of not yet known subcellular and network mechanisms from multiple brain regions. © 2023 The Author (s).

关键词： Laser scanning Microscopy Scanning microscopy Spatial resolution Three dimensional imaging Three dimensional measurement

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deep learning networks in the segmentation of the left atrial appendage in 2d ultrasound: A comparative analysis

Deep learning networks in the segmentation of the left atria...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Rafael Fernandes Helena R. Torres Bruno Oliveira João Azevedo Karen Fan Alex P. Lee João L. Vilaça Pedro Morais 2Ai - School of Technology IPCA Barcelos Portugal LASI-Associate Laboratory of Intelligent Systems Guimarães Portugal Algoritmi Center School of Engineering University of Minho Guimarães Portugal Life and Health Sciences Research Institute (ICVS) School of Medicine University of Minho Braga Portugal ICVS/3B's - PT Government Associate Laboratory Braga/Guimarães Portugal Department of Medicine and Therapeutics Division of Cardiology Prince of Wales Hospital Hong Kong China Laboratory for Cardiac Imaging and 3D Printing Li Ka Shing Institute of Health Science Faculty of Medicine The Chinese University of Hong Kong Hong Kong China

Left atrial appendage (LAA) is the major source of thromboembolism in patients with non-valvular atrial fibrillation. Currently, LAA occlusion can be offered as a treatment for these patients, obstructing the LAA through a percutaneously delivered device. Nevertheless, correct device sizing is a complex task, requiring manual analysis of medical images. This approach is sub-optimal, time-demanding, and highly variable between experts. different solutions were proposed to improve intervention planning, but, no efficient solution is available to 2d ultrasound, which is the most used imaging modality for intervention planning and guidance. In this work, we studied the performance of recently proposed deep learning methods when applied for the LAA segmentation in 2d ultrasound. For that, it was created a 2d ultrasound database. Then, the performance of different deep learning methods, namely Unet, UnetR, AttUnet, TransAttUnet was assessed. All networks were compared using seven metrics: i) dice coefficient; ii) Accuracy iii) Recall; iv) Specificity; v) Precision; vi) Hausdorff distance and vii) Average distance error. Overall, the results demonstrate the efficiency of AttUnet and TransAttUnet with dice scores of 88.62% and 89.28%, and accuracy of 88.25% and 86.30%, respectively. The current results demonstrate the feasibility of deep learning methods for LAA segmentation in 2d *** relevance— Our results proved the clinical potential of deep neural networks for the LAA anatomical analysis.

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40-2: demonstration of a Novel Single-Layer double-Pass Optical Architecture for a Pupil-Matched Occlusion-Capable Optical See-Through Head-Mounted display

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SId Symposium digest of Technical Papers 2020年第1期51卷

作者： Austin Wilson Hong Hua 3D Visualization and Imaging Systems Laboratory College of Optical Sciences University of Arizona Tucson Arizona USA

The rendering of mutual occlusion in optical see-through head-mounted displays (OST-HMds) poses several complex challenges. This paper discusses in detail these challenges and presents a novel optical architecture for enabling a compact, high performance, occlusion-capable optical see-through head-mounted display (OCOST-HMd) with correct, pupil-matched viewing perspective. The proposed design utilizes a single-layer, double-pass architecture, offering a compact OCOST-HMd solution to alleviate several of the main issues facing the state-of-art OST-HMds today. Our design is capable of rendering per-pixel mutual occlusion with correct viewing perspective between virtual and real views while achieving a very wide see-through field of view (FOV) in a wearable formfactor. Based on this optical architecture, we design and build a compact binocular prototype. The prototype offers a virtual display with an FOV of 34° by 22° with a wide see-though FOV of 90° by 50°, within which about 40° diagonally is occlusion-enabled. Further, the prototype system affords an angular virtual display resolution of 1.06 arc minutes per pixel, along with a modulated optical see-through angular resolution of 1.0 arc minutes.

关键词： Augmented reality Occlusion Pupil-matched display Head-mounted display OLEd LCoS Prototype

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design of a High-performance Optical See-through Light Field Head-mounted display

Design of a High-performance Optical See-through Light Field...

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SId Symposium, Seminar, and Exhibition 2018, display Week 2018

作者： Huang, Hekun Hua, Hong 3D Visualization and Imaging Systems Laboratory College of Optical Sciences The University of Arizona 1630 E University Blvd TucsonAZ85721 United States

ISBN: (纸本)9781510867659

This paper presents our recent development of a high-performance integral-imaging-based optical see-through light field head-mounted display that offers a spatial resolution of 3 arc minutes over a depth range of 3 diopters and a wide see-through view of 65° by 40°. We further experimentally demonstrate the optical performances of the proposed InI-HMd design in terms of its spatial resolution, depth of field, and focus cue accuracy. © 2018 SId.

关键词： Helmet mounted displays

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Systematic analysis method for multilayer light field display

Systematic analysis method for multilayer light field displa...

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3d Image Acquisition and display: Technology, Perception and Applications, 3d 2018

作者： Xu, Mohan Hua, Hong 3D Visualization and Imaging Systems Laboratory College of Optical Sciences University of Arizona 1630 East University Boulevard TucsonAZ85721 United States

ISBN: (纸本)9781943580446

We propose a systematic analysis method for the multilayer light field display by simulating the retinal image of a 3d scene rendered at different depths. The retinal image is calculated by convoluting the reconstructed image at test depth and the accumulated point spread function. We evaluate the retinal image with a slope difference method. Then investigate the trade-offs and guidelines for optimal display design. © 2018 The Author(s).

关键词： Optical transfer function

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P-21: A New Perceptual-driven Approach to Foveated Head-Mounted displays

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SId Symposium digest of Technical Papers 2020年第1期51卷

作者： Pengyinjie Lyu Hong Hua 3D Visualization and Imaging Systems Laboratory College of Optical Sciences University of Arizona 1630 East University Boulevard Tucson 85721 Arizona USA

We explore a new perceptual-driven static approach to design a foveated head-mounted display potentially offering nearly imperceptible degradation of image quality and potentially realizes large field of view and high resolution without eye tracker and scanning mechanisms. We presented the general method and further experimentally demonstrated the method with a 4K monitor.

关键词： Foveated Head-Mounted display Relative Visual Acuity Perceptual-driven Method

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54-3: digitally Switchable Micro Lens Array for Integral imaging

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SId Symposium digest of Technical Papers 2020年第1期51卷

作者： Xuan Wang Hong Hua 3D Visualization and Imaging Systems Laboratory College of Optical Science The University of Arizona 1630 E University Blvd. Tucson AZ 85721 USA

This paper presents the design of a digitally switchable multi-focal micro lens array to extend the depth of field without sacrificing the spatial resolution in integral imaging systems. The switchable multi-focal micro lens array consists of a customized freeform micro lens array and a programmable spatial light modulator. A prototype with two foci was fabricated and focus tuning functionality was demonstrated using an LCoS together with a relay system.

关键词： Switchable lens Micro lens array Integral imaging

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demonstration of an Occlusion-Capable Optical See-Through Head-Mounted display

Demonstration of an Occlusion-Capable Optical See-Through He...

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SId Symposium, Seminar, and Exhibition 2017, display Week 2017

作者： Wilson, Austin Hua, Hong 3D Visualization and Imaging Systems Laboratory College of Optical Sciences University of Arizona 1630 East University Boulevard TucsonAZ85721 United States

ISBN: (纸本)9781510848757

Most of the state-of-the-art optical see-though head-mounted displays lack the ability to occlude the real scene and fail to render the virtual scene in high contrast with bright surroundings. Mutual occlusion is a strong contributor to the human visual system’s ability to distinguish depth information and create a seamless integration of the real and virtual world. In this paper, we present a monocular prototype of an occlusion-capable optical see-through head mounted display and demonstrate its mutual occlusion capability and performance in bright environments. Our design currently uses an Organic LEd (OLEd) microdisplay coupled with a Liquid crystal on silicon (LCoS) type Spatial Light Modulator (SLM) to achieve a 30 degree diagonal FOV and 1920x1080 color resolution. © 2017 SId.

关键词： Augmented reality

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