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3d image acquisition and display: technology, perception and applications, 3d 2022

作者： Cao, Yonggui Xiao, Yin Pan, Zilan Chen, Wen Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong Hong Kong Photonics Research Institute The Hong Kong Polytechnic University Hong Kong Hong Kong

We present an algorithm to generate 2d arrays of random numbers as digital holograms to be used as optical information carriers to realize high-fidelity optical data transmission through scattering media in free space... 详细信息

ISBN: (纸本)9781957171098

关键词： Holograms

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dynamic Wind Turbine Blade 3d Model Reconstruction with Event Camera

Dynamic Wind Turbine Blade 3D Model Reconstruction with Even...

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UNIfied Conference of International Workshop on defence applications of Multi-Agent Systems, dAMAS 2023, International Conference on Maintenance Engineering, IncoME-V 2023, International conference on the Efficiency and Performance Engineering Network, TEPEN 2023

作者： Li, Qiuxian Wang, Zheng Jie, Leiping Hu, Yiyang deng, Rongfeng Zhang, Hui Department of Computer Science and Technology BNU-HKBU United International College Zhuhai China School of Industrial Automation Beijing Institute of Technology Zhuhai519088 China

ISBN: (纸本)9783031494208

In this paper, we proposed E2dSNeRF, a new image-based method that is highly suitable for 3d reconstruction of wind turbines. Specifically, considering the smooth and textureless characteristics of wind turbine blades that can lead to blurring and ghosting, we use event cameras with high dynamic range and low latency instead of regular RGB-d cameras to capture images of wind turbines. Then, compared to the dozens of images required by the vanilla neural radiation field method NeRF, we used very sparse input views, which greatly reduced the burden of image acquisition and preprocessing. In addition, the use of deep supervision not only improves the rendering quality of sparse input views, but also eliminates blurring and ghosting caused by low textures on wind turbine blades. At the same time, in order to obtain a more accurate camera pose, we added necessary feature points to the background when collecting the wind turbine dataset to ensure that the camera pose obtained by COLMAP is sufficiently accurate. due to sparse input views, our method has significantly improved training speed compared to NeRF. The experimental results demonstrate the feasibility and effectiveness of this method, which has lower cost and clearer reconstruction results compared to traditional methods. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Cameras

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Computational Imaging Using deterministic Optical Fields and Non-linear Reconstruction

Computational Imaging Using Deterministic Optical Fields and...

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3d image acquisition and display: technology, perception and applications, 3d 2022

作者： Arockiaraj, Francis Gracy Selva, Shakina Jothi Inbanathan, Stephen Rajkumar Kamalam, Manueldoss Beaula Ruby Rajeswary, Aravind Simon John Francis Anand, Vijayakumar Rosen, Joseph PG & Research Department of Physics The American College Tamilnadu Madurai625 002 India Institute of Physics University of Tartu Tartu50411 Estonia Swinburne University of Technology Hawthorn MelbourneVIC3122 Australia School of Electrical and Computer Engineering Ben Gurion University of the Negev P. O. Box 653 8410501 Israel

Computational imaging techniques are indirect ones consisting of two steps: optical recording and computational reconstruction. In this study, deterministic optical fields such as Bessel, Airy, Gaussian and Laguerre-G...

ISBN: (纸本)9781957171098

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The effect of angular resolution and 3d rendering on the perceived quality of the industrial use cases of light field visualization 16

The effect of angular resolution and 3D rendering on the per...

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16th International Conference on Signal-image technology and Internet-Based Systems (SITIS)

作者： Kara, Peter A. Guindy, Mary Xinyu, Qiu Szakal, Vince A. Balogh, Tibor Simon, Aniko Budapest Univ Technol & Econ Budapest Hungary Kingston Univ London England Holografika Budapest Hungary Pazmany Peter Catholic Univ Budapest Hungary Sigma Technol Budapest Hungary

ISBN: (纸本)9781665464956

Light field displays enable glasses-free 3d visualization without major constraints regarding the number of simultaneous viewers. There are numerous potential future use case contexts for such devices. Industrial contexts include prototype review and other types of modeling use cases, where the visualized content may vary a lot in terms of complexity and dimensions. However, the perception of 3d models with higher structural fidelity may be severely affected by the ray density of visualization. Furthermore, as the visualized content is always the sharpest in the plane of the screen of the light field display, rendering with greater depth may already result in blurred regions even if the angular resolution is high. In this paper, the effect of angular resolution and 3d rendering on the perceived quality of the industrial use cases of light field visualization is explored via a subjective study. The structurally-diverse source contents are rendered with different depth values, and the resulting test stimuli are created in seven extents of angular resolution, ranging between 0.5 degrees and 2 degrees. The obtained results not only exhibit the combined effect of the investigated features, but also highlight methodological considerations.

关键词： light field angular resolution 3d rendering visualization quality quality of experience

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Analysis and removal of crosstalk in a time-multiplexed light-field display

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OPTICS EXPRESS 2021年第5期29卷 7435-7452页

作者： Liu, Boyang Sang, Xinzhu Yu, Xunbo Ye, Xiaoqian Gao, Xin Liu, Li Gao, Chao Wang, Peiren Xie, Xinhui Yan, Binbin Beijing Univ Posts & Telecommun BUPT State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

Time-multiplexed light-field displays (TMLFds) can provide natural and realistic three-dimensional (3d) performance with a wide 120 degrees viewing angle, which provides broad potential applications in 3d electronic sand table (EST) technology. However, current TMLFds suffer from severe crosstalk, which can lead to image aliasing and the distortion of the depth information. In this paper, the mechanisms underlying the emergence of crosstalk in TMLFd systems are identified and analyzed. The results indicate that the specific structure of the slanted lenticular lens array (LLA) and the non-uniformity of the emergent light distribution in the lens elements are the two main factors responsible for the crosstalk. In order to produce clear depth perception and improve the image quality, a novel ladder-type LCd sub-pixel arrangement and a compound lens with three aspheric surfaces are proposed and introduced into a TMLFd to respectively reduce the two types of crosstalk. Crosstalk simulation experiments demonstrate the validity of the proposed methods. Structural similarity (SSIM) simulation experiments and light-field reconstruction experiments also indicate that aliasing is effectively reduced and the depth quality is significantly improved over the entire viewing range. In addition, a tabletop 3d EST based on the proposed TMLFd is presented. The proposed approaches to crosstalk reduction are also compatible with other lenticular lens-based 3d displays. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Holographic displays image processing image quality Lens arrays Lenticular lenses Spatial resolution

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Efficient and accurate object detection for 3d point clouds in intelligent visual internet of things

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MULTIMEdIA TOOLS ANd applications 2021年第20期80卷 31297-31334页

作者： Li, Hui Wang, Junyin Xu, Lingwei Zhang, Shujun Tao, Ye Qingdao Univ Sci & Technol Sch Informat Sci & Technol Qingdao 266061 Peoples R China South Cent Univ Nationalities Hubei Key Lab Intelligent Wireless Commun Wuhan 430074 Peoples R China Lanzhou Jiaotong Univ Minist Educ Key Lab Optotechnol & Intelligent Control Lanzhou 730070 Peoples R China

Visual perception is a key technology in the Intelligent Visual Internet of Things. The research of object detection methods is of great significance for improving the safety and efficiency of unmanned driving technology and intelligent visual Internet of Things. 3d point clouds object detection of deep learning can not only use the deep network to automatically learn characteristics of the multi-layer abstract structure, improve calculation efficiency and detection accuracy of the model, but also have better performance in dealing with object occlusion, absence and data sparsity with obtained high-dimensional point clouds information. However, the current review of object detection methods for 3d point clouds based on deep learning is scarce. In order to provide a more comprehensive understanding and understanding of the security and efficiency development of driverless technology, this paper is divided into the monocular camera, RGB-d image and LidAR point cloud, according to the main data of the network model, and further subdivides according to the different use methods of the model. Analyze the performance of various model detection methods. This article also summarizes current commonly used 3d point clouds datasets of object detection, organizes and describes detection metrics of commonly used 3d point clouds, and discusses research challenges and development trends. The real-time performance of 3d point cloud object detection under the intelligent vision Internet of Things needs to be improved.

关键词： Internet of things Object detection 3d point clouds Monocular camera RGB-d image LidAR

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Compact interferometric projector for high accuracy 3d imaging in space

Compact interferometric projector for high accuracy 3D imagi...

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3d image acquisition and display: technology, perception and applications, 3d 2021 - Part of Imaging and Applied Optics Congress 2021

作者： Thorstensen, Jostein Thielemann, Jens Risholm, Petter Gjessing, Jo SINTEF Digital Forskningsveien 1 Oslo0373 Norway

ISBN: (纸本)9781557528209

We describe a novel projector design based on interferometric fringe projection. The key component in the projector, a movable micro-mirror, has undergone initial vibration, TVAC and radiation testing, with no observed component degradation. We use multi-frame active stereo as basis for 3d reconstruction, giving 3d measurement standard deviation of 0.2 mm, with 12.5 Hz 3d image capture rate and 3d image resolution of 500 x 500 pixels. The system's low power, small size and component longevity makes it well suitable for space applications. © 2021 The Author(s)

关键词： image resolution

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Tri-aperture monocular laparoscopic objective for stereoscopic and wide field of view acquisition

Tri-aperture monocular laparoscopic objective for stereoscop...

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3d image acquisition and display: technology, perception and applications, 3d 2021 - Part of Imaging and Applied Optics Congress 2021

作者： Kwan, Elliott Hua, Hong 3D Visualization and Imaging Systems Laboratory James C. Wyant College of Optical Sciences University of Arizona 1630 E University Blvd. TucsonAZ85721 United States

This paper presents a manufacturable monocular laparoscopic objective lens design that acquires simultaneous stereoscopic views via two apertures and a custom prism and an additional wider field of view via a central ... 详细信息

ISBN: (纸本)9781557528209

关键词： Stereo image processing

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High dynamic range 3d measurement based on space-time speckle correlation and color multiplexing

High dynamic range 3D measurement based on space-time speckl...

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3d image acquisition and display: technology, perception and applications, 3d 2021 - Part of Imaging and Applied Optics Congress 2021

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

ISBN: (纸本)9781557528209

关键词： Speckle

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Automatic registration of gesture-sensor data and light-field for aerial 3d-touch interface

Automatic registration of gesture-sensor data and light-fiel...

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3d image acquisition and display: technology, perception and applications, 3d 2021 - Part of Imaging and Applied Optics Congress 2021

作者： Sánchez Salazar Chavarría, Iván A. Nakamura, Tomoya Yamaguchi, Masahiro School of Engineering Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Kanagawa Yokohama226-8503 Japan The Institute of Scientific and Industrial Research Osaka University 8-1 Mihogaoka Osaka Suita567-0047 Japan

We propose an automatic registration method for the data obtained by a commercial 3d-tracking sensor and the 3d image reproduced by a light-field display for an aerial 3d-touch interface. © 2021 The Author(s)

ISBN: (纸本)9781557528209

关键词： Antennas

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