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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

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dual-beam structured-light scanning for 3-d object modeling

Dual-beam structured-light scanning for 3-D object modeling

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： J. Park G.N. deSouza A.C. Kak Robot Vision Laboratory Purdue University West Lafayette IN USA

ISBN: (纸本)0769509843

In this paper we present our dual-Beam Structured-Light Scanner (dSLS), a scanning system that generates range maps much richer than those obtained from a conventional structured-light scanning system. Range maps produced by dSLS require fewer registrations for 3-d modeling. We show that the dSLS system more easily satisfies what are often difficult-to-satisfy conditions for determining the 3-d coordinates of an arbitrary object point. Two specific advantages of dSLS over conventional structured-light scanning are: (1) A single scan by the dSLS system is capable of generating range data on more surfaces than possible with the conventional approach using the same number of camera images. And (2) since the data collected by dSLS is more free of self-occlusions, the object needs be examined from a smaller number of viewpoints.

关键词： dSL Three dimensional displays Robot kinematics Robot vision systems Laboratories Buildings Cameras Belts Iterative methods Iterative closest point algorithm

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IS-NEAR: Implicit Semantic Neural Engine and Multi-Sensor data Rendering With 3d Global Feature

IS-NEAR: Implicit Semantic Neural Engine and Multi-Sensor Da...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Tiecheng Sun Wei Zhang Xingliang dong Tao Lin Huawei 2012 Laboratories Central Media Technology Institute University Of Stuttgart Audiovisual Lab Huawei Munich Research Center

ISBN: (数字)9798350362459

ISBN: (纸本)9798350362466

data-driven Computer Vision (CV) tasks are still limited by the amount of labeled data. Recently, some semantic NeRFs have been proposed to render and synthesize novel-view semantic labels. Although current NeRF methods achieve spatially consistent color and semantic rendering, the capability of the geometrical representation is limited. This problem is caused by the lack of global information among rays in the traditional NeRFs since they are trained with independent directional rays. To address this problem, we introduce the point-to-surface global feature into NeRF to associate all rays, which enables the single ray representation capability of global geometry. In particular, the relative distance of each sampled ray point to the learned global surfaces is calculated to weight the geometry density and semantic-color feature. We also carefully design the semantic loss and back-propagation function to solve the problems of unbalanced samples and the disturbance of implicit semantic field to geometric field. The experiments validate the $3 d$ scene annotation capability with few feed labels. The quantification results show that our method outperforms the state-of-the-art works in efficiency, geometry, color and semantics on the public datasets. The proposed method is also applied to multiple tasks, such as indoor, outdoor, part segmentation labeling, texture re-rendering and robot simulation.

关键词： Geometry Computer vision Three-dimensional displays Image color analysis Semantics Rendering (computer graphics) Labeling

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Object recognition by combining viewpoint invariant Fourier descriptor and convex hull

Object recognition by combining viewpoint invariant Fourier ...

引用

international symposium on Intelligent Multimedia, Video and Speech processing

作者： M.P. Yu K.C. Lo Department of Electronic and Information Engineering Hong Kong Polytechnic University Hung Hom Hong Kong China

ISBN: (纸本)9628576623

It is observed that the shape recognition process that uses global information would fail when dealing with occlusion. In this paper, an algorithm that combines the methods of viewpoint invariant Fourier descriptor and convex hull is presented for recognizing 3d planar objects by their contours. Invariants are calculated from a set of local segments extracted from the convex hull of a shape. Under such approach, an object is represented by sets of invariant points instead of a single point in a 2d parameter space of I/sub 1/ and I/sub 2/. The method is efficient and yields a high recognition rate in recognizing partially occluded objects. Classification can be carried out correctly even when the convex hull of the object has changed as a result of occlusion.

关键词： Object recognition Cameras Image recognition Shape measurement data mining Computer vision Image segmentation Aircraft Speech processing transmission line matrix methods

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diffusion Shape Prior for Wrinkle-Accurate Cloth Registration

Diffusion Shape Prior for Wrinkle-Accurate Cloth Registratio...

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international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： Jingfan Guo Fabian Prada donglai Xiang Javier Romero Chenglei Wu Hyun Soo Park Takaaki Shiratori Shunsuke Saito University of Minnesota Codec Avatars Lab Meta Carnegie Mellon University

ISBN: (数字)9798350362459

ISBN: (纸本)9798350362466

Registering clothes from 4d scans with vertex-accurate correspondence is challenging, yet important for dynamic appearance modeling and physics parameter estimation from real-world data. However, previous methods either rely on texture information, which is not always reliable, or achieve only coarse-level alignment. In this work, we present a novel approach to enabling accurate surface registration of texture-less clothes with large deformation. Our key idea is to effectively leverage a shape prior learned from pre-captured clothing using diffusion models. We also propose a multi-stage guidance scheme based on learned functional maps, which stabilizes registration for large-scale deformation even when they vary significantly from training data. Using high-fidelity real captured clothes, our experiments show that the proposed approach based on diffusion models generalizes better than surface registration with VAE or PCA-based priors, outperforming both optimization-based and learning-based non-rigid registration methods for both interpolation and extrapolation tests.

关键词： Solid modeling Three-dimensional displays Shape deformation Clothing Training data Surface texture

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Adaptive Quality Meshing for "on-the-fly" Volumetric Mesh Manipulations within Virtual Environments

Adaptive Quality Meshing for "on-the-fly" Volumetric Mesh Ma...

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IEEE international symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems (VECIMS)

作者： Holger Graf Sebastian Pena Serna Andre Stork Fraunhofer-Institut für Graphische Datenverarbeitung Darmstadt Germany

This paper presents a new approach for interactive 3d (volume) mesh manipulations based on 'on-the-fly' quality measures in order to keep the consistency of the mesh. Within pure engineering tasks, such as the analysis of physical behaviour, virtual environments only established as post processing unit, in which simulation results can be interactively displayed and visualized to get more in depth information about the simulation mock up. However, most of the simulations are done off-line which do not allow for interactive `what-if' analysis in view of a change of the primary design domain. As design changes of the underlying CAx/FE models usually imply many manual interferences, repair and efforts (re-meshing tasks, grid repair, etc.) in order to guarantee elements of high quality during re-meshing or mesh refinement tasks, an evaluation within virtual environments is not suitable with current techniques. Thus this paper aims at introducing our approach in order to change 3d volumetric meshes on the fly and keep the consistency of the newly generated mesh in view of engineering analysis

关键词： Virtual environment Mesh generation Analytical models Volume measurement Iron Virtual reality Computer aided engineering data visualization Stress Anthropometry

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Automatic body measurement for mass customization of garments

Automatic body measurement for mass customization of garment...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： A. Certain W. Stuetzle Manifold Graphics Inc. USA Department of Statistics University of Washington USA

We sketch the design of a simple lower body scanner with two scan heads, positioned in front of and behind the body. The scan heads are very simple, and we believe that the scanner could be built for less than $10 K. We then describe a simple model for the lower body consisting of two stacks of ellipses, and an algorithm for fitting this model to the points and silhouettes produced by the scanner. We outline a way of extracting body dimensions from this model and discuss in detail our method to determine a subject's crotch level, a rather difficult problem. Finally, we present simulation results on the expected accuracy of the body dimensions, obtained by means of a scanner simulator.

关键词： Mass customization Shape measurement Software measurement Clothing industry data mining Graphics Statistics Electronic switching systems Identity-based encryption Fitting

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Real-time streaming of point-based 3d video

Real-time streaming of point-based 3D video

引用

IEEE Annual international symposium Virtual Reality

作者： E. Lamboray S. Wurmlin M. Gross Computer Graphics Laboratory Swiss Federal Institute of Technology Zurich Switzerland

ISBN: (纸本)0780384156

Free-viewpoint video is a promising technology for next-generation virtual and augmented reality applications. Our goal is to enhance collaborative VR applications with 3d video-conferencing features. In this paper, we propose a 3d video streaming technique which can be deployed in telepresence environments. The streaming characteristics of real-time 3d video sequences are investigated under various system and networking conditions. We introduce several encoding techniques and analyze their behavior with respect to resolution, bandwidth and inter-frame jitter. Our 3d video pipeline uses point samples as basic primitives and is fully integrated with a communication framework handling acknowledgment information for reliable network transmissions and application control data. The 3d video reconstruction process dynamically adapts to processing and networking bottlenecks. Our results show that a reliable transmission of our pixel-based differential prediction encoding leads to the best performance in terms of bandwidth, but is also quite sensitive to packet losses. A redundantly encoded stream achieves better results in presence of burst losses and seamlessly adapts to varying network throughput.

关键词： Streaming media Encoding Bandwidth Telecommunication network reliability Augmented reality Collaboration Virtual reality Real time systems Video sequences Jitter

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Graph-Based Volumetric data Segmentation on a Hexagonal-Prismatic Lattice

Graph-Based Volumetric Data Segmentation on a Hexagonal-Pris...

引用

international symposium on Multimedia Applications and processing

作者： Mihai Popescu Razvan Tudor Tanasie Department of Software Engineering Faculty of Automatics Computers and Electronics University of Craiova Romania

ISBN: (纸本)9781467307086

In this paper we present a graph-based volumetric data segmentation method based on a 3d hexagonal prismatic lattice. We evaluate the advantages and disadvantages of using this lattice in contrast with classic ones. One of the main advantages are high isoperimetric quotient, near equidistant neighbours (ability to represent curves better, resulting in a better segmentation) and high connectivity. disadvantages are due to the main stream lack of interest in this area and thus data sets must be converted back and forth from rectangular to hexagonal latices both in acquisition and visualization processes.

关键词： volumetric segmentation hexagonal lattice

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Structure, chemistry, and electrical performance of silicon oxide-nitride-oxide stacks on silicon

Structure, chemistry, and electrical performance of silicon ...

引用

international Semiconductor device Research symposium, ISdRS 2003

作者： Levin, I. Kovle, M. Leapmad, R.d. Yoder, d. Fischer, d. Roizin, Ya. Ceramics Division National Institute of Standards and Technology GaithersburgMD20899 United States Tower Semiconductor LTD. P.O. Box 619 Migdal Haemek23105 Israel Division of Bioengineering and Physical Science National Institutes of Health ORS BethesdaMD20892 United States

ISBN: (纸本)0780381394

Silicon oxide-nitride-oxide multilayers (ONO stacks) attract considerable interest for the charge storage structures in non-volatile memory devices [1 -2]. Ultra-thin ONO stacks are commonly prepared by thermal growth of a SiO2 layer (bottom oxide) on silicon, followed by low-pressure chemical vapor deposition (LPCVd) of Si3N4. Subsequently, the top oxide is either grown by the nitride re-oxidation or deposited by LPCVd. The typical thickness of individual layers in the ONO stacks ranges from 5 nm to 15 nm. The critical structural and compositional parameters that affect electrical performance of ONO based devices include the physical density of the amorphous oxiddnitride layers and depth distributions of oxygen, nitrogen, and hydrogen atoms. In this study, we applied (i) spatially-resolved electron-energy loss spectroscopy (EELS) in a transmission electron microscope and (ii) secondary ion mass spectroscopy (SIMS) to analyze elemental distributions in the differently processed ONO stacks deposited on Si. Additionally, densities of individual layers in the ONO stacks were measured using X-ray reflectometry (XRR). EELS spectrum-imaging in a dedicated scanning transmission electron microscope (STEM) revealed radiation-induced nitrogen segregation to the Si/SiO2 interfaces;the extent of nitrogen segregation increased visibly with increasing the radiation dose. The EELS metrology was optimized to obtain artifact-free data. Artifactfree measurements revealed lack of detectable nitrogen segregation to the Si/SiO2 interfaces regardless of processing conditions used. SIMS analysis demonstrated that higher thermal budget used to process the top oxide layer yields lower hydrogen content at the Si/SiO2 interface and broader nitrogen distribution across the top SiO2/Si3N4 interface. No nitrogen segregation to the Si/SiO2 interfaces was observed consistent with the EELS measurements. XRR measurements revealed a clear dependence of the density of the top oxide layer on the proces

关键词： Electron energy loss spectroscopy

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Research and application of BIM based bridge operation health monitoring system

Research and application of BIM based bridge operation healt...

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Signal processing, Communications and Engineering Management Conference (ISPCEM), international

作者： Xinran Li Yingxue Li Wei Zhao Xincheng Huang Chongqing Zhengchengbiaoyan Engineering Testing Co. Ltd Chongqing China Chongqing College of Architecture and Technology Chongqing China

Based on a cable-stayed bridge in Chengdu, a health monitoring system based on bridge operation period is established in this paper. By combining BM with traditional health monitoring technology, the 3d model of the monitoring system is visualized. Through the establishment of acquisition and transmission module, real-time data collection is realized. Intelligent analysis and preprocessing of massive monitoring data are realized by virtual server and system self-diagnosis technology deployed in cloud computing center. Through the multi-platform display and video linkage technology of the system, especially the development of mobile APP software, the bridge manager can get real-time safety warning and master the operation status of the structure at any time. Through the statistical analysis of singularity rate and missing rate of massive monitoring data, as well as the early warning of overload event, the system is verified to be in good running state, the monitoring data is reliable and the safety early warning is efficient.

关键词： Bridges Solid modeling Three-dimensional displays Statistical analysis data visualization Streaming media Real-time systems

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