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2020 International conference on Mechanical Automation and Computer Engineering, MACE 2020

作者： Han, Ruilu Yan, Hongjuan Ma, Liping North China University of Technology College of Mechanical and Material Engineering Beijing100144 China Research Center of Precision Sensing and Control Institute of Automation Chinese Academy of Sciences Beijing100190 China

There are many studies on 3d reconstruction based on monocular vision, but for complex surface parts, contour occlusion problems will occur, which requires binocular or multi-eye vision for 3d reconstruction. This paper mainly uses binocular structured light vision to study 3d reconstruction. The specific methods are: use structured light coding to calibrate the binocular camera, the projector and the left and right cameras to obtain the calibration parameters, and then obtain the 3d coordinates based on the triangulation principle that there is only one intersection between the camera straight line equation and the projector plane equation in space. Because of the binocular structured light used in this article, the point clouds of the left and right cameras need to be merged to complete the stitching process of the two points clouds. Through the verification of this methods, the stitching error is good, and the point cloud can be streamlined later to improve the point cloud registration rate. © Published under licence by IOP Publishing Ltd.

关键词： Binocular vision

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The Influence of Measuring Location on Volume Estimation by Shadow Casting Method

The Influence of Measuring Location on Volume Estimation by ...

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International conference on Business and Industrial Research (ICBIR)

作者： Taweepol Suesut Siwakorn Sukprasertchai School of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (数字)9798350383027

ISBN: (纸本)9798350383034

Non-contact inspection has dominated various industries for many years, particularly in the field of food and agricultural processes. Volume estimation can be achieved by volumetric imagery or 3d reconstruction. The casting of shadows or shape by shading is an active technique that can be utilized to generate volumetric imagery. By evaluating the length of shadows, the object height data can be achieved, and the transformation of image coordinates to world coordinates is facilitated by means of homography transformation. The width, length, and height of object edges along the entirety of its length are employed to reconstruct virtual slices. The integration of these virtual slices enables the estimation of the object's volume. This research studied the variation of the measuring locations, three different diameters spherical balls 38mm, 50mm, and 80mm are used as test materials. The percentage of errors in volume obtained from all sections by shadow casting were compared to computation volume of sphere formula is approximately -1.6 %, -1.13 %, and - 6.60%, respectively, depending on the size of the object. Furthermore, a visualization-based analysis is presented which has no significant difference. From this studied, it can be concluded that this method is valuable in estimating the volume of axially symmetrical objects.

关键词： Casting Three-dimensional displays Shape Volume measurement Area measurement Inspection Software Splines (mathematics) Image reconstruction Python

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design of patient-specific mandibular reconstruction plates and a hybrid scaffold

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Computers in Biology and Medicine 2025年 184卷 109380-109380页

作者： dogan, Sait Emre Ozturk, Cengizhan Koc, Bahattin Bogazici University Institute of Biomedical Engineering Istanbul34684 Turkey 3D Bioprinting Laboratory Sabanci University Nanotechnology Research and Application Center Istanbul34956 Turkey Faculty of Engineering and Natural Sciences Sabanci University Istanbul34956 Turkey

Background: Managing segmental mandibular defects remains challenging, requiring a multidisciplinary approach despite the remarkable progress in mandibular reconstruction plates, finite element methods, computer-aided design and manufacturing techniques, and novel surgical procedures. complex surgeries require a comprehensive approach, as using only reconstruction plates or tissue scaffolds may not be adequate for optimal results. The limitations of the treatment options should be investigated towards a patient-specific trend to provide shorter surgery time, better healing, and lower costs. Integrated hybrid scaffold systems are promising in improving mechanical properties and facilitating healing. By combining different materials and structures, hybrid scaffolds can provide enhanced support and stability to the tissue regeneration process, leading to better patient outcomes. The use of such systems represents a significant advancement in tissue engineering and a wide range of medical procedures. Materials and Methods: A head and neck computed tomography (CT) data of a patient with odontogenic myxoma was used for creating a three-dimensional (3d) mandible model. virtual osteotomies were performed to create a segmental defect model, including the angulus mandibulae region. The first mandibular reconstruction plate was designed. Finite elemental analyses (FEA) and topology optimizations were performed to create two different reconstruction plates for different treatment scenarios. The FEA were performed for the resulting two plates to assess their biomechanical performance. To provide osteoconductive and osteoinductive properties a scaffold was designed using the defect area. A biomimetic Tricalcium phosphate-Polycaprolactone (TCP-PCL) hybrid bone scaffold enhanced with Hyaluronic acid dipping was manufactured. Results: The results of the in-silico analysis indicate that the designed reconstruction plates possess robust biomechanical performance and demonstrate remark

关键词： Hyaluronic acid

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3d visualization Enhancement of Art Image based on virtual Reality Technology

3D Visualization Enhancement of Art Image based on Virtual R...

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Wireless Communications and Applications (ICWCAPP), International conference on

作者： Yan Wang College of Literature and Journalism Sichuan University Chengdu Sichuan China

In order to enhance the 3d visualization of art images, this paper studies the 3d visual enhancement of fashion art images based on image virtual reality technology. The 3d feature detection and data acquisition of virtual scene are realized by the method of dark channel color scene parameter acquisition and information fusion. The distributed parameter model of fashion art image is established, the virtual reality scene of fashion art image is reconstructed, and the 3d filtering and feature analysis model is established. Feature analysis and RGB pixel reorganization are carried out by image information enhancement and parameter feedback compensation. Through exposure fusion and white balance control, the stereo visual enhancement of fashion art image is realized. The simulation results show that the research improves the reconstruction and recognition ability of fashion style art images, and the three-dimensional expression ability of art images is better, and the scene fidelity is higher.

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reconstruction of Wire Frame Model of complex Images using Syntactic Pattern Recognition 4

Reconstruction of Wire Frame Model of Complex Images using S...

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4th Smart Cities Symposium, SCS 2021

作者： Rani, Shilpa Ghai, deepika Kumar, Sandeep Lovely Professional University Punjab India ECE Department Lovely Professional University Punjab India CSE Department KL Deemed to be University Vijayawada India

ISBN: (纸本)9781839536588

reconstruction of 3d images is always a challenging task for the research community and scientist because 3d image reconstruction describes the quantitative characteristics of the objects i.e., shape, size, texture, and volume. The proposed work represents the wireframe model of 3d reconstruction and introduced a new algorithm to represent three-dimensional images in a textual form. In the proposed work firstly identified the wireframe model and then describes the image characteristics. The syntactic based algorithm extracts the image characteristics in the form of knowledge vectors. The proposed work is having a novelty in form of vector of knowledge that provides a significant contribution in security. In addition, the knowledge vector is used to rebuild the image wireframe model and a single pass is enough for the original image to be reconstructed. In the proposed work two standard publicly available database (PASCAL 3d+ and example-based 3d object arrangements) used for evaluation of the proposed work. The accuracy of the proposed method is 93.21%, 94.66% on PASCAL 3d+ and example-based 3d object arrangements datasets. The algorithm takes 1.01 seconds for the reconstruction of the wireframe model. According to the results obtained, the proposed methodology gives better results than the existing state-of-the-art methods. © 2021 IET conference Proceedings. All rights reserved.

关键词： Textures

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Flow Control and Passive Low Noise Technologies for Landing Gear Noise Reduction 28

Flow Control and Passive Low Noise Technologies for Landing ...

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28th AIAA/CEAS Aeroacoustics conference

作者： Bennett, Gareth J. Lai, Jiang O'Brien, Gordon Ragni, daniele Avallone, Francesco Carpio, Alejandro Rubio Pott-Pollenske, Michael Univ Dublin Trinity Coll Dublin Sch Engn Parsons Bldg Dublin D02 PN40 Ireland Delft Univ Technol Dept Flow Phys & Technol Kluyverweg 1 NL-2629HS Delft Netherlands German Aerosp Ctr DLR Inst Aerodynam & Flow Technol Lilienthalpl 7 D-38108 Braunschweig Germany

ISBN: (数字)9781624106644

ISBN: (纸本)9781624106644

This paper examines the use of both flow control and passive low noise technologies to reduce the aerodynamic noise radiated from a modified LAGOON landing gear, as tested in the EU funded H2020 collaborative research project: INVENTOR, InnoVative dEsign of iNstalled airframe componenTs for aircraft nOise Reduction. At approach to landing, landing gear noise is still a significant contributor to environmental noise in the vicinity of airports. Progress is being made with ambitious projects which aim to develop significantly reconfigured aircraft architectures to reduce airframe noise. The current project examines noise abatement measures which could be retrofit to existing landing gear configurations. Flow control in the form of low TRL "air curtains" which form a fluidic shield or virtual fairing are examined. Amongst the most interesting passive solutions are a selection of higher TRL porous materials in the form of wire mesh, perforated plates and 3d materials. In order to provide a simplified baseline landing gear mock-up on which to test the low noise technologies, the LAGOON NLG is modified with the addition of a torque-link and brakes and is called the "LAGOON-SLG". The porous materials are assessed experimentally in the A-Tunnel aeroacoustic facility in TU delft, the Netherlands and the air curtains are examined in dLRs AWB aeroacoustic facility in Braunschweig, Germany.

关键词： Computational Aeroacoustics Landing Gear Porous Materials Free Stream Velocity Vertical Wind Tunnel Particle Image Velocimetry Aerodynamic Flows Flow visualization Numerical Analysis Mass Flow

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OmniColor: A Global Camera Pose Optimization Approach of LidAR-360Camera Fusion for Colorizing Point Clouds

OmniColor: A Global Camera Pose Optimization Approach of LiD...

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IEEE International conference on Robotics and Automation (ICRA)

作者： Bonan Liu Guoyang Zhao Jianhao Jiao Guang Cai Chengyang Li Handi Yin Yuyang Wang Ming Liu Pan Hui The Hong Kong University of Science and Technology (Guangzhou) Guangzhou China The Hong Kong University of Science and Technology Hong Kong SAR China

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

A Colored point cloud, as a simple and efficient 3d representation, has many advantages in various fields, including robotic navigation and scene reconstruction. This representation is now commonly used in 3d reconstruction tasks relying on cameras and LidARs. However, fusing data from these two types of sensors is poorly performed in many existing frameworks, leading to unsatisfactory mapping results, mainly due to inaccurate camera poses. This paper presents Omni-Color, a novel and efficient algorithm to colorize point clouds using an independent 360-degree camera. Given a LidAR-based point cloud and a sequence of panorama images with initial coarse camera poses, our objective is to jointly optimize the poses of all frames for mapping images onto geometric reconstructions. Our pipeline works in an off-the-shelf manner that does not require any feature extraction or matching process. Instead, we find optimal poses by directly maximizing the photometric consistency of LidAR maps. In experiments, we show that our method can overcome the severe visual distortion of omnidirectional images and greatly benefit from the wide field of view (FOV) of 360-degree cameras to reconstruct various scenarios with accuracy and stability. The code will be released at https://***/liubonan123/OmniColor/.

关键词： Point cloud compression visualization Three-dimensional displays Laser radar Accuracy Robot vision systems virtual reality

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Combining 3d Surveying with Archaeological Uncertainty: The Metopes of the Athenian Treasury at delphi 12

Combining 3D Surveying with Archaeological Uncertainty: The ...

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12th International conference on Information, Intelligence, Systems and Applications, IISA 2021

作者： Mania, Katerina Psalti, Athanasia Lala, dimitra-Maria Tsakoumaki, Marilena Polychronakis, Andreas Rempoulaki, Anastasia Xinogalos, Michael Maravelakis, Emmanuel Technical University of Crete Electrical and Computer Engineering Greece Ephorate of Antiquities of Phocis Ministry of Culture and Sports of Greece Astrolabe Engineering Hellenic Mediterranean University Electronic Engineering Greece

ISBN: (纸本)9781665400329

At the archaeological site of delphi, significant monuments inherently communicate uncertainty regarding the reconstruction of their initial form. An innovative, preliminary, theoretical formulation of a 3d visualization system is proposed, combining 3d surveying based on terrestrial laser scanning and archaeological uncertainty which, unlike past work, will offer multiple hypotheses to be visualized. The system, when implemented, will take as input the archaeologists' assessment regarding various evidence and offers probabilistic reasoning in relation to the monuments' past form, which is finally reconstructed and visualized in 3d. The positioning of the metopes of the Athenian Treasury at delphi is presented as a case study. © 2021 IEEE.

关键词： visualization

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Three-dimensional reconstruction of transmission channel hidden trouble distance measurement based on multi-eye monitoring equipment 18

Three-dimensional reconstruction of transmission channel hid...

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18th International conference on AC and dC Power Transmission, ACdC 2022

作者： Wen, Qingfeng Chang, An Li, Longji Wang, Songbo Guo, Wei Nan, Jieyin Li, Xuegang He, Xiao State Grid Tianjin Electric Power Corporation Electric Power Research Institute Tianjin China State Grid Tianjin Electric Power Company High Voltage Company Tianjin China State Grid Tianjin Electric Power Corporation Tianjin China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

With the popularization of transmission channel visualization and intelligent identification technology, effective management and control of hidden dangers in power transmission channels has become more and more important. The clearance distance of a hidden hazard is an important criterion for judging the degree of hazard of a hidden hazard. However, the currently applied ranging technology has a relatively large error. This paper proposes a technology suitable for feature extraction and feature matching of transmission channels. And image set is obtained by feature matching. We generate a depth map of the three-dimensional space scene of the transmission channel. Based on the reconstructed depth map, the hidden danger in the transmission channel is measured. It can improve the efficiency of daily inspections and operation and maintenance management of transmission line hidden dangers and channel scenarios. It can help operation and maintenance personnel find hidden dangers in time. Thereby, the safe and stable operation of the line can be guaranteed. © ACdC 2022. All rights reserved.

关键词： Electric lines

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digital restoration and visualization of Nanfeng ancient city-focusing on cultural mining

Digital restoration and visualization of Nanfeng ancient cit...

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2021 International conference on Computer Engineering and Innovative Application of VR, ICCEIA VR 2021

作者： Li, dan Lin, Hui He, Qinghua Li, Jiaxin School of Geography and Environment Jiangxi Normal University Jiangxi Nanchang330022 China Key Laboratory of Poyang Lake Wetland and Watershed Research Ministry of Education Jiangxi Normal University Jiangxi Nanchang330022 China

Taking Nanfeng ancient city as an example, based on mining local culture, digital reconstruction of the ancient city is realized by using digital technologies such as remote sensing mapping, 3d modelling, geographic information and virtual reality and then a virtual platform for digital protection and exhibition of the ancient city is constructed. Firstly, the research sorted out the cultural connotation of the ancient city space from the three spatial levels including space, block and street pattern and then established the geospatial database. Using the key technologies of oblique photogrammetry, laser point cloud, 3d modelling and panoramic technology to restore and visualize the ancient city and then developing the virtual digital display platform which integrated the functions of digital model integration, route recommendation and customization, panoramic roaming and interaction. Finally, the platform was built. The idea and practice of combining cultural mining with digital construction can help to realize the protection and wide spread of Nanfeng ancient city culture and promote the sustainable inheritance of ancient city culture. © Published under licence by IOP Publishing Ltd.

关键词： 3d modeling

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