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

共 655 条记录，以下是221-230 订阅

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3d data acquisition an elaboration for classification an recognition of objects and people 1

3D data acquisition an elaboration for classification an rec...

引用

1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Arrighetti, S. Guanziroli, S. Ottaviani, E. Mauri, G. Zoppis, I. Schettini, R. Zhou, Shuangquan Comerson Srl Via Lombardia 15 Carate BrianzaMilano20048 Italy Università degli Studi di Milano-Bicocca Dipartimento Sistemistica e Comunicazioni Italy ITIM-CNR Via Ampere 56 Milano20131 Italy Consorzio Milano Ricerche Via Cicognara 7 Milano20129 Italy

ISBN: (纸本)0769515215

In this paper we will describe a system for recognizing people based on the 3d reconstruction of their faces. The system consists of four parts: acquisition of an implicit representation of 3d data (phase image) from a double CCd camera;reconstruction of the explicit 3d and color face (XYZ surface and LUV data);extraction of significant features;classification and recognition of the face, and identification of the person. © 2002 IEEE.

关键词： CCd cameras

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Three-dimensional visualization of Overhead transmission Lines with UAV-LidAR Point Cloud data 3

Three-dimensional Visualization of Overhead Transmission Lin...

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2023 3rd international Conference on Power System and Energy Internet, PoSEI 2023

作者： Li, dongbo Lan, Guiwen Huang, Hanqiang Wei, Jia Zhou, Fengfan College of Geomatics and Geoinformation Guilin University of Technology Guilin541000 China

Three-dimensional reconstruction and visualization of overhead transmission lines is an important foundation for grid operation and maintenance management. This paper introduces a 3d visualization method of transmission lines based on the unmanned aerial vehicle (UAV) light detection and ranging (LidAR) technology, which includes four steps: (I) Using UAV-LidAR technology to obtain 3d point cloud data of power lines;(II) Using the least-squares method with loss minimization constraints to fit the point cloud data of the power lines, to obtain the accurate fitting function of the power lines;(III) Using the spline interpolation algorithm to draw the 3d scene in the 3d vectors, and combine with building information modeling (BIM) model to construct the transmission line visualization scene. The method of this paper can improve the authenticity and reliability of transmission line simulation and provide technical support for the digital platform of power grid management. © Published under licence by IOP Publishing Ltd.

关键词： visualization

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Spherical diffussion for 3d surface smoothing 1

Spherical diffussion for 3D surface smoothing

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Bülow, T. Computer Science Division University of California Berkeley 485 Soda Hall # 1776 BerkeleyCA94720-1776 United States

ISBN: (纸本)0769515215

We present an approach to surface smoothing based on linear diffusion. In contrast to mesh-based approaches we represent surfaces as scalar functions defined on the sphere which restricts the analysis to star-shaped objects. We derive the Green's function of the linear diffusion process on the sphere and identify it with the spherical Gauss function. This allows us to introduce a linear scale-space for data on the sphere. The approach is computationally efficient since does not require iterative smoothing. Several examples are presented demonstrating the evolution of surfaces and their parabolic lines under the spherical diffusion process. © 2002 IEEE.

关键词： Spheres

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The efficient extension of globally consistent scan matching to 6 doF 4

The efficient extension of globally consistent scan matching...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Borrmann, dorit Elseberg, Jan Lingemann, Kai Nüchter, Andreas Hertzberg, Joachim University of Osnabrück Knowledge-Based Systems Research Group Albrechtstraße 28 OsnabrückD-49069 Germany

Over ten years ago, Lu and Milios presented a probabilistic scan matching algorithm for solving the simultaneous localization and mapping (SLAM) problem with 2d laser range scans, a standard in robotics. This paper presents an extension to this GraphSLAM method. Our iterative algorithm uses a sparse network to represent the relations between several overlapping 3d scans, computes in every step the 6 degrees of freedom (doF) transformation in closed form and exploits efficient data association with cached k-d trees. Our approach leads to globally consistent 3d maps, precise 6d pose and covariance estimates, as demonstrated by various experimental results. © 2008 Georgia Institute of Technology.

关键词： Robotics

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Automatic 3d video summarization: Key frame extraction from self-similarity 4

Automatic 3D video summarization: Key frame extraction from ...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Huang, Peng Hilton, Adrian Starck, Jonathan Centre for Vision Speech and Signal Processing University of Surrey GuildfordGU2 7XH United Kingdom

In this paper we present an automatic key frame selection method to summarise 3d video sequences. Key-frame selection is based on optimisation for the set of frames which give the best representation of the sequence according to a rate-distortion trade-off. distortion of the summarization from the original sequence is based on measurement of self-similarity using volume histograms. The method evaluates the globally optimal set of key-frames to represent the entire sequence without requiring pre-segmentation of the sequence into shots or temporal correspondence. Results demonstrate that for 3d video sequences of people wearing a variety of clothing the summarization automatically selects a set of key-frames which represent the dynamics. Comparative evaluation of rate-distortion characteristics with previous 3d video summarization demonstrates improved performance. © 2008 Georgia Institute of Technology.

关键词： Economic and social effects

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Adaptive online transmission of 3d TexMesh using scale-space analysis

Adaptive online transmission of 3D TexMesh using scale-space...

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Proceedings - 2nd international symposium on 3d data processing, visualization, and transmission. 3dPVT 2004

作者： Cheng, Irene Boulanger, Pierre Department of Computing Science Univ. of Alberta Edmonton Canada

ISBN: (纸本)0769522238

Efficient online visualization of 3d mesh and photo realistic texture is essential for a variety of applications, such as museum exhibits and medical images. In these applications synthetic texture and a predefined set of views is not an option. We propose using a mesh simplification algorithm based on scale-space analysis of the feature point distribution, combined with an associated analysis of the surface texture, to address the needs of adaptive online transmission of high quality 3d objects. The premise of the proposed textured mesh (TexMesh) simplification is the following: minor variations in texture can be ignored in relatively smooth regions of a 3d surface, without significantly affecting human perception. Statistics on 3d feature point distribution and their associated texture fragments are gathered during preprocessing. Online transmission is based on these statistics, which can be retrieved in constant time. Based on monitored bandwidth a scaled mesh is first transmitted. Starting from a default texture quality, we apply an efficient Harmonic Time Compensation Algorithm based on the current bandwidth and a time limit, to adaptively adjust the texture quality of the next fragment. Properties of the algorithm are proved. Experimental results show the usefulness of our approach. © 2004 IEEE.

关键词： Computer science

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VINCI 2010: 3rd Visual Information Communication - international symposium

VINCI 2010: 3rd Visual Information Communication - Internati...

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3rd international symposium on Visual Information Communication, VINCI 2010

ISBN: (纸本)9781450304368

The proceedings contain 18 papers. The topics discussed include: difference of inflow and outflow based 3d streamline placement;the research of the regional pollutant concentration visualization based on the particles;simulating self-organizing behaviors of fish school;visualization of BP neural network using parallel coordinates;exploring the relative importance of crossing number and crossing angle;semantic comparison of structured visual dataflow programs;process visualization to solve the travelling salesman problem;a developing framework for interactive temporal data visualization;cooperative concept map based on cognitive model for visual analysis;interactive visualization with user perspective: a new concept;harvesting discourse strategies for rapid prototyping of tailored information delivery systems;event-based approach to money laundering data analysis and visualization;and an interactive sensemaking framework for mobile visual analytics.

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Colon centreline calculation for CT colonography using optimised 3d opological thinning 1

Colon centreline calculation for CT colonography using optim...

引用

1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Sadleir, R.J.T. Whelan, P.F. Vision Systems Laboratory School of Electronic Engineering Dublin City University Dublin 9 Ireland

ISBN: (纸本)0769515215

CT colonography is an emerging technique for colorectal cancer screening. This technique facilitates noninvasive imaging of the colon interior by generating virtual reality models of the colon lumen. Manual navigation through these models is a slow and tedious process. It is possible to automate navigation by calculating the centreline of the colon lumen. There are numerous well documented approaches for centreline calculation. Many of these techniques have been developed as alternatives to 3d topological thinning which has been discounted by others due to its computationally intensive nature. This paper describes a fully automated, optimised version of 3d topological thinning that has been specifically developed for calculating the centreline of the human colon. © 2002 IEEE.

关键词： Virtual reality

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Enhanced surface reconstruction from wide baseline images

Enhanced surface reconstruction from wide baseline images

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Megyesi, Z Chetverikov, d Comp & Automat Res Inst Budapest Hungary

ISBN: (纸本)0769522238

This paper deals with the Problem of dense matching from stereo images under wide baseline conditions. By considering the characteristic properties of widely separated views, we propose an extension to a recently published algorithm for detailed reconstruction of continuous surfaces. The algorithm compensates for the occurrent affine distortion between the views to allow low level intensity based comparison necessary for dense matching. The matching itself is performed by an enhanced region rowing based affine propagation method that takes surface distortion into account to handle complex piecewise-smooth surfaces. It is experimentally shown that this new method can achieve smooth and accurate reconstruction from wide baseline images of both indoor and outdoor scenes. To quantify the reconstruction results we have created realistic synthetic datasets with ground truth. These datasets form the core of a future testbed for comparison of different wide baseline surface reconstruction techniques. In the current study, results on the synthetic images are compared to the ground truth to measure the accuracy of our method.

关键词： Image reconstruction

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3d-model view characterization using equilibrium planes 4

3D-model view characterization using equilibrium planes

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Theetten, Adrien Ansary, Tarik Filali Vandeborre, Jean-Philippe University of Lille 1 France Institut TELECOM TELECOM Lille 1 France

We propose a new method for 3d-mesh model characteristic view selection. It consists in using the views that come from the equilibrium states of a 3d-model: they correspond to the horizontal plane on which an object is statically laying under the effect of gravity. The selected views are then very intuitive for the user. Indeed, to present a query, the user will take a photo or draw a sketch of the object on a table or on a floor, putting thus the object in a static mechanical equilibrium. Consequently, our view selection method follows the same principles: finding all the equilibrium planes of an object and obtaining their relative 2d views. We present the experiments and results of our method on the Princeton 3d Shape Benchmark database using a collection of 50 images (photos, sketches, etc.) as queries, showing the performance of our method in 3d retrieval from photos. © 2008 Georgia Institute of Technology.

关键词： Query processing

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