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Large Horizontal Viewing-Angle Three-dimensional Light Field display Based on Liquid Crystal Barrier and Time-division-Multiplexing 1

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1st International Conference on VR/AR and 3d displays, ICVRd 2020

作者： dai, Renxiang Sang, Xinzhu Xing, Shujun Yu, Xunbo Gao, Xin Liu, Li Liu, Boyang Gao, Chao Wang, Yuedi Ge, Fan State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications P.O. Box 72 Beijing100876 China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing100084 China

ISBN: (数字)9789813365490

ISBN: (纸本)9789813365483

Three-dimensional (3d) light field display can reconstruct vector of light field of 3d scene eliminating convergence-adjustment conflict (CAC) with full parallax and nature color cues, however it suffers from its limited viewing-angle, the mediocre display resolution, an insufficient gross of viewing perspectives and the complex setup. Here, a large horizontal viewing-angle 3d light field display with horizontal viewing zone of 70° and vertical viewing zone of 35° without resolution reduction based on liquid crystal barrier (LC-Barrier) and time-division-multiplexing (TdM) is presented. The proposed 3d light field display consists of a holographic functional screen (HFS), a lens array (LA), an LC-Barrier and a 28-inch LCd with resolution of 3840 × 2160. By analyzing the corresponding relationships of rays from elemental image array (EIA), a series of pixel-mapping equations are derived. Moreover, the issue that horizontal resolution will decrease as the horizontal viewing-angle doubles can be addressed by enhancing the resolution utilizing TdM. The fill factor is introduced to evaluate the imaging effect. Experimental results demonstrate that the large horizontal viewing-angle 3d light field display based on LC-Barrier and TdM can present actual 3d stereoscope images with correct occlusion and perception. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Time division multiplexing

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Single-shot 3d measurement with a hybrid fringe projection

Single-shot 3D measurement with a hybrid fringe projection

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3d image acquisition and display: technology, perception and applications, 3d 2020 - Part of Imaging and Applied Optics Congress

作者： Zhang, Shaohui Li, Tong Hu, Yao Hao, Qun School of Optics and Photonics Beijing Institute of Technology Beijing100081 China

We report a single-shot three-dimensional (3d) measurement approach with a speckle embedded fringe projection. Phase and spatial feature descriptor are used simultaneously to achieve global optimal stereo matching and... 详细信息

ISBN: (纸本)9781557528209

关键词： Stereo image processing

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基于图像的自动驾驶3d目标检测综述——基准、制约因素和误差分析

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中国图象图形学报 2023年第6期28卷 1709-1740页

作者：李熙莹叶芝桧韦世奎陈泽陈小彤田永鸿党建武付树军赵耀中山大学智能工程学院深圳518107 中山大学·深圳深圳518107 广东省智能交通系统(ITS)重点实验室深圳518107 北京交通大学信息科学研究所北京100044 北京大学信息科学技术学院北京100871 兰州交通大学电子与信息工程学院兰州730070 山东大学数学学院济南250100

从高分辨率图像中获取周边目标的精准3d位置和尺寸信息是实现自动驾驶控制和行为决策的基础,因此基于图像的3d目标检测是自动驾驶领域中的研究热点。已有学者对该领域方法论及成果进行了比较详细的综述,但对于导致现有方法检测精度不尽... 详细信息

从高分辨率图像中获取周边目标的精准3d位置和尺寸信息是实现自动驾驶控制和行为决策的基础,因此基于图像的3d目标检测是自动驾驶领域中的研究热点。已有学者对该领域方法论及成果进行了比较详细的综述,但对于导致现有方法检测精度不尽如意的制约因素未能进行深入系统的分析。考虑自动驾驶领域在工程应用方面的要求高,且现有方法以数据驱动类型为主,本文从常用数据集和评价基准、数据影响、方法论的制约因素和误差等角度,对学术界和产业界在3d目标检测方面的研究成果及行业应用进行较为系统的阐述。首先,从学术界探索成果以及自动驾驶行业的应用角度进行概要介绍。然后,从数据采集设备、数据精度和标注信息3方面详细分析总结了KITTI等4个通用数据集,并对这些数据集提出的主要评价指标进行对比分析。接着,从数据和方法论方面分析制约算法性能的主要因素及由此造成的误差影响。在数据方面,制约因素主要是数据精度、样本差异、标注数据量和标注规范;在方法论方面,制约因素主要包括先验几何关系、深度预测误差和数据模态等。最后,对国内外研究现状进行总结,并在数据集、评价指标和目标深度预测等方面提出了未来需要重点关注的研究方向。

关键词： 3d目标检测基准制约因素误差分析自动驾驶图像处理计算机视觉

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3d capture and display based on spatial imaging technology

3D capture and display based on spatial imaging technology

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3d image acquisition and display: technology, perception and applications, 3d 2020 - Part of Imaging and Applied Optics Congress

作者： Watanabe, Hayato Sasaki, Hisayuki Ikeya, Kensuke Okaichi, Naoto Kano, Masanori Omura, Takuya Arai, Jun Kawakita, Masahiro Mishina, Tomoyuki 1-10-11 Kinuta Setagaya Tokyo157-8510 Japan

We have been studying spatial imaging technologies for realizing three-dimensional (3d) television broadcasting services. This paper presents our multi-camera systems to capture 3d images and our light field 3d displa... 详细信息

ISBN: (纸本)9781557528209

关键词： Three dimensional displays

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Meta-Lens Particle image Velocimetry

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AdVANCEd MATERIALS 2024年第17期36卷 2310134-2310134页

作者： Liu, Xiaoyuan Zhao, Zhou Xu, Shengming Zhang, Jingcheng Zhou, Yin He, Yulun Yamaguchi, Takeshi Ouyang, Hua Tanaka, Takuo Chen, Mu Ku Shi, Shengxian Qi, Fei Tsai, din Ping City Univ Hong Kong Dept Mat Sci & Engn Kowloon 83 Tat Chee Ave Hong Kong 999077 Peoples R China Shanghai Jiao Tong Univ Sch Mech Engn 800 Dongchuan Rd Shanghai 200240 Peoples R China RIKEN Ctr Adv Photon Innovat Photon Manipulat Res Team Saitama 3510198 Japan RIKEN Cluster Pioneering Res Metamat Lab Saitama 3510198 Japan Tokushima Univ Inst Postled Photon Tokushima 7708506 Japan City Univ Hong Kong State Key Lab Terahertz & Millimeter Waves Kowloon Hong Kong 999077 Peoples R China City Univ Hong Kong Ctr Biosyst Neurosci & Nanotechnol Kowloon Hong Kong 999077 Peoples R China

Fluid flow behavior is visualized through particle image velocimetry (PIV) for understanding and studying experimental fluid dynamics. However, traditional PIV methods require multiple cameras and conventional lens systems for image acquisition to resolve multi-dimensional velocity fields. In turn, it introduces complexity to the entire system. Meta-lenses are advanced flat optical devices composed of artificial nanoantenna arrays. It can manipulate the wavefront of light with the advantages of ultrathin, compact, and no spherical aberration. Meta-lenses offer novel functionalities and promise to replace traditional optical imaging systems. Here, a binocular meta-lens PIV technique is proposed, where a pair of GaN meta-lenses are fabricated on one substrate and integrated with a imaging sensor to form a compact binocular PIV system. The meta-lens weigh only 116 mg, much lighter than commercial lenses. The 3d velocity field can be obtained by the binocular disparity and particle image displacement information of fluid flow. The measurement error of vortex-ring diameter is approximate to 1.25% experimentally validates via a Reynolds-number (Re) 2000 vortex-ring. This work demonstrates a new development trend for the PIV technique for rejuvenating traditional flow diagnostic tools toward a more compact, easy-to-deploy technique. It enables further miniaturization and low-power systems for portable, field-use, and space-constrained PIV applications. A compact binocular meta-lens PIV system is demonstrated. The 3d velocity field can be obtained by the binocular disparity and particle image displacement information of fluid flow. It's a new development trend for the PIV technique for rejuvenating traditional flow diagnostic tools toward a more compact, easy-to-deploy technique. It enables further miniaturization and low-power systems for portable, field-use, and space-constrained PIV ***

关键词： binocular stereo vision depth perception meta-lens particle image velocimetry (PIV)

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Lightfield microscopy, an emerging tool for real-time 3d imaging

Lightfield microscopy, an emerging tool for real-time 3D ima...

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3d image acquisition and display: technology, perception and applications, 3d 2020 - Part of Imaging and Applied Optics Congress

作者： Martinez-Corral, M. Scrofani, G. Sanchez-Ortiga, E. Saavedra, G. 3D Imaging and Display Laboratory Department of Optics University of Valencia BurjassotE46100 Spain

Integral, or lightfield, microscopy offers the possibility of capturing and processing in real time multiple views of 3d fluorescent samples captured with a single shot. In this contribution we review the recent advan... 详细信息

ISBN: (纸本)9781557528209

关键词： Imaging systems

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Stationary Multi X-ray Source System with Carbon Nanotube Emitters for digital Tomosynthesis

Stationary Multi X-ray Source System with Carbon Nanotube Em...

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Medical Imaging Conference - Physics of Medical Imaging

作者： Park, Junyoung Gupta, Amar Prasad Kim, Wooseob Lim, Jongmin Yeo, Seungjun Kim, dongkeun Jeong, Changwon Yoon, Kwon-Ha Cho, Seungryong Ahn, Jeung Sun Mativenga, Mallory Ryu, Jehwang Kyung Hee Univ Dept Phys Seoul 02447 South Korea ASTEL Dept Hardware Invest Daejeon 34111 South Korea Wonkwang Univ Hosp Med Convergence Res Ctr Iksan 54538 Jeollabuk Do South Korea Kyung Hee Univ Dept Informat Display Seoul 02447 South Korea Korea Adv Inst Sci & Technol Dept Nucl & Quantum Engn Daejeon 34141 South Korea

ISBN: (纸本)9781510640207

In order to diagnose diseases in complex areas such as the chest, an X-ray system of a suitable type is required. Chest tomosynthesis, which acquires a reconstructed 3d image by taking X-ray images from various angles, is one of the best image acquisition technologies in use. However, one major disadvantage of tomosynthesis systems with a single X-ray source is the motion blur which occurs when the source moves or rotates to change the acquisition angle. To overcome this, we report a stationary digital tomosynthesis system, which uses 85 field-emission type X-ray sources based on carbon nanotubes (CNTs). By using CNT-based electronic emitters, it is possible to miniaturize and digitize the X-ray system. This system is designed such that a maximum of 120 kV can be applied to the anode to obtain chest X-ray images. The field emission characteristics of the CNT-based emitters are measured, and X-ray images were obtained using the stationary multi X-ray source system, confirming its applicability to chest Tomosynthesis.

关键词： Tomosynthesis 3d imaging Carbon nanotube Multi X-ray source

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Spectral 3d reconstruction of impressionist oil painting based on macroscopic OCT imaging

Spectral 3D reconstruction of impressionist oil painting bas...

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3d image acquisition and display: technology, perception and applications, 3d 2020 - Part of Imaging and Applied Optics Congress

作者： Zhou, Xingyu In, darlene Chen, Xing Liu, Xuan Yang, Yi Dept. of Electrical and Computer Engineering New Jersey Institute of Technology University Heights NewarkNJ07102 United States Division of Science and Engineering Penn State Abington 1600 Woodland Rd AbingtonPA19001 United States

We present a hybrid scanning platform combined with effective algorithm for real-time sampling and artifact removal to achieve macroscopic OCT (macro-OCT) imaging and spectral 3d reconstruction of impressionist style ... 详细信息

ISBN: (纸本)9781557528209

关键词： image reconstruction

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Stable multimodal three-dimensional imaging

Stable multimodal three-dimensional imaging

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3d image acquisition and display: technology, perception and applications, 3d 2020 - Part of Imaging and Applied Optics Congress

作者： Kumar, Manoj Matoba, Osamu Quan, Xiangyu Tamada, Yosuke Awatsuji, Yasuhiro Graduate School of System Informatics Kobe University Kobe Japan School of Engineering Utsunomiya University Utsunomiya Japan Faculty of Electrical Engineering and Electronics Kyoto Institute of Technology Kyoto Japan

ISBN: (纸本)9781557528209

A highly stable multimodal 3d imaging system is developed, for simultaneous recording and retrieval of 3d fluorescence imaging and quantitative phase distribution of a biological sample, by incorporating the single-shot common-path off-axis configurations of the incoherent and coherent digital holographic microscopes, respectively. © OSA 2020

关键词： Fluorescence imaging

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Intelligent 3d Visual defect detection for Industrial applications 3

Intelligent 3D Visual defect Detection for Industrial Applic...

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2022 3rd International Conference on Internet of Things, Artificial Intelligence and Mechanical Automation, IoTAIMA 2022

作者： Yang, Rui Ke, Hualin Gan, Lin Li, Yuhong Hu, Ruihan Guangdong Institute of Intelligent Manufacturing Guangdong Key Laboratory of Modern Control Technology Guangzhou510070 China Cloud Computing Center Chinese Academy of Sciences Dongguan523808 China Guangdong Key Laboratory of Modern Control Technology Guangdong Institute of Intelligent Manufacturing Guangzhou China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Beijing China Xinjiang Production and Construction Corps Key Laboratory of Modern Agricultural Machinery Shihezi University Shihezi China

Currently, new energy industries such as electric vehicles and energy storage batteries are experiencing rapid growth throughout the world. As a recognized ideal energy storage element, lithium batteries have also attracted considerable interest. To improve image contrast, the industry employs image preprocessing algorithms. due to the high requirement of image consistency in the template matching method, which is difficult to meet in practice, and the large apparent difference between defects, it is challenging to design features. Therefore, the framework for defect detection is based on a method of deep learning with strong feature expression capability. In light of the severe imbalance in the number of samples in defect detection, data augmentation and generation methods are used to simulate real samples in order to improve the training effect of deep neural networks and alleviate the burden of data annotation to some extent. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Lithium batteries

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