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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91-100 订阅

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An improved 3d human face reconstruction approach based on cubic splines models

An improved 3D human face reconstruction approach based on c...

引用

3rd international symposium on 3d data processing, visualization, and transmission, 3dPVT 2006

作者： Amor, Boulbaba Ben Ardabilian, Mohsen Chen, Liming MI Department Ecole Centrale de Lyon LIRIS Laboratory CNRS 5205 36 av. Guy de Collongue 69134 Lyon France

ISBN: (纸本)0769528252

In this paper, we develop a new hybrid active vision/geometric modeling approach dedicated to 3d human face recovery. Initially, a 3d coarse reconstruction is obtained via a structured-light assisted stereo sensor. Here, the stereo matching problem is resolved through two main stages: (a) sub-pixel stripe edge localization of projected patterns of light, and(b) correspondences establishing based on adaptive dynamic programming optimization technique. Next, the introduction of smooth interpolation models achieves the fine reconstruction. Here, cubic Spline curves are employed in order to improve the quality of the reconstructed models. Indeed, they allow us to produce dense and details preserving reconstructions by following the control points from the coarse reconstruction stage. Furthermore, we present some reconstruction results and discuss both qualitative and quantitative evaluations of the proposed reconstruction scheme. © 2006 IEEE.

关键词： Interpolation

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Using 3d-Bresenham for resampling structured grids

Using 3D-Bresenham for resampling structured grids

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

作者： dimitrov, LI Austrian Acad Sci Commiss Sci Visualizat A-1220 Vienna Austria

ISBN: (纸本)0769522238

Structured grids and some of their applications in natural sciences are discussed. The problem of their visualization and quantitative evaluation is considered and possible ways for its solution sketched. Resampling a structured grid onto a regular one is such a possible solution offering the additional benefit of enabling quantitative evaluations, too. This resampling is achieved by a preliminary tetrahedronization of the structured grid(s) and a subsequent digitalization of the constituent tetrahedrons using an adaptation of the 3d-Bresenham algorithm. Advantages and disadvantages of this approach as compared to other possible schemes are discussed. An implementation based on our open source f3d-file format for storage and transmission of volumetric data is presented, and results from applying it to real-world data shown.

关键词： Natural sciences computing

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Fast 3d model acquisition from stereo images 1

Fast 3D model acquisition from stereo images

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

作者： Morency, LP Rahimi, A darrell, T MIT AI Lab Cambridge MA 02139 USA

ISBN: (纸本)0769515215;0769515223

We propose a fast 3d model acquisition system that aligns intensity, and depth images, and reconstructs a textured 3d mesh. 3d views are registered with shape alignment based on intensity gradient constraints and a global registration algorithm. We reconstruct the 3d model using a new Cubic Ray, Projection merging algorithm which takes advantage of a novel data structure: the linked voxel space. Finally, we present experiments to test the accuracy of our approach on 3d face modeling using real-time stereo images.

关键词： Three dimensional computer graphics

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The Virtual Boutique: a synergic approach to virtualization, content-based management of 3d information, 3d data mining and virtual reality for e-commerce 1

The Virtual Boutique: a synergic approach to virtualization,...

引用

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

作者： Paquet, E Viktor, H Peters, S CNR Visual Informat Technol Ottawa ON Canada

ISBN: (纸本)0769515223

The Virtual Boutique is an e-commerce environment based on virtual reality and content-based management Of three-dimensional information. The boutique and its content arc virtualized with laser scanners and photogrammetric techniques. Algorithms for searching the boutique inventory by three-dimensional shape and image content are described. Business rules are data mined from the interaction of the consumer with the boutique in a virtual environment.

关键词： Virtual reality

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d>Transforming Least Squares to Weighted Least Squares for Accurate Range Image Registrationd>

<bold>Transforming Least Squares to Weighted Least Squares f...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Liu, Yonghuai Zhou, Hong Su, Xuan Ni, Mingxin Lloyd, Robert J. Univ Wales Aberystwyth SY23 3DB Dyfed Wales

ISBN: (纸本)9780769528250

The traditional ICP algorithm is a de facto standard approach for range image registration. While it assumes that one data set is a subset of another this assumption is often violated in practice. As a result, a number of algorithms have been developed to first eliminate false matches due to occlusion, appearance and disappearance of points and then estimate the camera motion parameters in the least squares sense. Instead of eliminating outliers in the process of image registration, we in this paper use the generalised entropy to estimate the probability of correspondences established using the traditional closest point criterion, leading camera motion parameters to be estimated in the weighted least squares sense. For more accurate registration results, we also learn from the probability of correspondences estimated in the past. Since one point in one data set can only correspond to a single point in another the two way constraint is also imposed. Finally the camera motion parameters are optimized using the powerful mean field annealing scheme. A comparative study based on real images has shown that the proposed algorithm produces promising automatic range image registration results.

关键词： Image registration

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3d volume extraction and mesh generation using energy minimization techniques 1

3D volume extraction and mesh generation using energy minimi...

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

作者： doi, A Fujiwara, S Matsuda, K Kameda, M Iwate Prefectural Univ Fac Software & Informat Sci Morioka Iwate Japan

ISBN: (纸本)0769515215;0769515223

In order to automatically extract an arbitrary 3d region from 3d image data (volume data), we have developed a physics-based approach using a 3d deformable grid model, which we called "3d Active Grid". 3d Active Grid is an extension of 3d deformable surface models, such as "balloon", and "3d Active Net". Unlike 3d deformable surface models, the proposed method enables us stable extraction of a 3d region by using both boundary and interior information. Moreover since the generated geometry data can be input directly into FEM (Finite Element Method), 3d Active Grid has many potential applications including virtual simulation of surgery, shape modeling, computer vision, and so on.

关键词： Mesh generation

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A Bayesian approach to building footprint extraction from aerial LIdAR data

A Bayesian approach to building footprint extraction from ae...

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3rd international symposium on 3d data processing, visualization and transmission

作者： Wang, Oliver Lodha, Suresh K. Helmbold, david P. Univ Calif Santa Cruz Santa Cruz CA 95064 USA

ISBN: (纸本)9780769528250

Building footprints have been shown to be extremely useful in urban planning, infrastructure development, and roof modeling. Current methods for creating these footprints are often highly manual and rely largely on architectural blueprints or skilled modelers. In this work we will use aerial LIdAR data to generate building footprints automatically. Existing automatic methods have been mostly unsuccessful due to large amounts of noise around building edges. We present a novel Bayesian technique for automatically constructing building footprints from a pre-classified LIdAR point cloud. Our algorithm first computes a bounded-error approximate building footprint using an application of the shortest path algorithm. We then determine the most probable building footprint by maximizing the posterior probability using linear optimization and simulated annealing techniques. We have applied our algorithm to more than 300 buildings in our data set and observe that we obtain accurate building footprints compared to the ground truth. Our algorithm is automatic and can be applied to other man-made shapes such as roads and telecommunication lines with minor modifications.

关键词： Antennas

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Real time visualization of 3d variable in time object based on cloud of points data gathered by coloured structure light projection system

Real time visualization of 3D variable in time object based ...

引用

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

作者： Garbat, P Wegiel, M Kujawinska, M Warsaw Univ Technol Inst Micromech & Photon PL-02525 Warsaw Poland

ISBN: (纸本)0769522238

The problem of virtual view creation has received increasing attention in recent years. Major current approaches are based on modified stereo vision systems. Recently the structure light measurement system based on digital light projection supported by special data coding and processing allow to rapid 3d shape acquisition. Application of this technology to record 3d data has increased significantly the accuracy of reconstructed shape and simplified data manipulation process. In the paper the general concept of virtual reality system supported by data gathered by means of structure light projection is presented. The methodology of conversion of cloud of measurement points (x,y,z,R,G,B) into virtual reality environment is described. It is supported by implementation of a virtual camera concept, as the mean for interactive object visualization. The methodology of real time 3d object visualization based on its coding by means of specially formed contours and their B-spline approximation is presented. The applicability of the methodology has been shown on numerically generated data which simulate performance of the measurement system. The total processing path was successfully tested.

关键词： shape measurement virtual reality colour structure light projection 3d object monitoring 3d object visualizat

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visualization of arbitrary-shaped 3d scenes on depth-limited 3d displays

Visualization of arbitrary-shaped 3D scenes on depth-limited...

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

作者： Redert, A Philips Res Labs NL-5656 AA Eindhoven Netherlands

ISBN: (纸本)0769522238

We propose a depth scaling method that enables visualization of arbitrary-shaped 3d scenes on 3d displays. Most current 3d displays have a depth limitation, while the scene to be displayed has not. The trivial solutions as clipping or linear scaling of the scene's 3d bounding box suffer from non-optimal utilization of the display's capabilities. Our approach uses spatially adaptive depth scaling that maximizes the perceptual 3d effect. From the original scene geometry, the topology and local depth ordering among objects are preserved, while depth linearity is disregarded. The scaling method applies to nearly all 3d displays, such as glasses-based, head-tracked, multi-view, holographic and volumetric 3d displays. Subjective tests with the dynamic dimension display system show that our method significantly increases the perceptual 3d effect.

关键词： display devices

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Visual data navigators "Collaboratories" 1

Visual data navigators "Collaboratories"

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

作者： Jern, M Palmberg, S Ranlöf, M Linkoping Univ ITN S-60174 Norrkoping Sweden

ISBN: (纸本)0769515215;0769515223

A "Collaboratory" is a lightweight application component allowing project teams to collaborate and share data and insight while distributed over a network, using intuitive visual navigation techniques. The innovation can be summarised as the integration of network technology used in collaborative games with 3d data navigation technique based on a low-level, fine-grained, customisable "atomic" visualization component infrastructure. In this paper we have focused on 3d medical imaging tools describing a Collaboratory implementation of a "Volume Viewer". This paper is also a blueprint to inform researchers and software engineers about the possibility to extend existing visualisation applications to support collaboration, e.g. making it easier to "collaboratize" visualization applications based on Microsoft's directX class library.

关键词： visualization

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