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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391-400 订阅

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An experimental comparison of feature-based 3d retrieval methods

An experimental comparison of feature-based 3D retrieval met...

引用

international symposium on 3d data processing visualization and transmission

作者： B. Bustos d. Keim d. Saupe T. Schreck d. Vranic Department of Computer and Information Science University of Konstanz Germany

3d objects are an important type of multimedia data with many promising application possibilities. defining the aspects that constitute the similarity among 3d objects, and designing algorithms that implement such similarity definitions is a difficult problem. Over the last few years, a strong interest in methods for feature-based 3d similarity search has arisen, and a growing number of competing algorithms for content-based retrieval of 3d objects have been proposed. We present an extensive experimental evaluation of the retrieval effectiveness and efficiency of a large part of the current state-of-the-art feature-based methods for 3d similarity search, giving a contrasting assessment of the different approaches.

关键词： Information retrieval Spatial databases Search methods Solid modeling Information science Application software Algorithm design and analysis Content based retrieval Software libraries Image retrieval

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Applying mesh conformation on shape analysis with missing data

Applying mesh conformation on shape analysis with missing da...

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international symposium on 3d data processing visualization and transmission

作者： Xiangyang Ju Zhili Mao J.P. Siebert N. McFarlane Jiahua Wu R. Tillett Department of Computing Science University of Glasgow UK Silsoe Research Institute Silsoe UK

A mesh conformation approach that makes use of deformable generic meshes has been applied to establishing correspondences between 3d shapes with missing data. Given a group of shapes with correspondences, we can build up a statistical shape model by applying principal component analysis (PCA). The conformation at first globally maps the generic mesh to the 3d shape based on manually located corresponding landmarks, and then locally deforms the generic mesh to clone the 3d shape. The local deformation is constrained by minimizing the energy of an elastic model. An algorithm was also embedded in the conformation process to fill missing surface data of the shapes. Using synthetic data, we demonstrate that the conformation preserves the configuration of the generic mesh and hence it helps to establish good correspondences for shape analysis. Case studies of the principal component analysis of shapes were presented to illustrate the successes and advantages of our approach.

关键词： Shape data analysis data processing data visualization

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Interactive modeling from dense color and sparse depth

Interactive modeling from dense color and sparse depth

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international symposium on 3d data processing visualization and transmission

作者： V. Popescu E. Sacks G. Bahmutov Computer Science Department Purdue University USA

We are developing a system for interactive modeling of real world scenes. The acquisition device consists of a video camera enhanced with an attached laser system. As the operator sweeps the scene, the device acquires dense color and sparse depth frames that are registered and merged into a point-based model. The evolving model is rendered continually to provide immediate operator feedback. The interactive modeling pipeline runs at five frames per second. We model scenes in two modes based on their geometric complexity. Scenes that contain large smooth surfaces are modeled freehand; scenes that contain small uneven surfaces are modeled using a parallax-free camera bracket.

关键词： Color data processing data visualization

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An easy viewer for out-of-core visualization of huge point-sampled models

An easy viewer for out-of-core visualization of huge point-s...

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international symposium on 3d data processing visualization and transmission

作者： Fang Meng Hongbin Zha National Laboratory on Machine Perception Peking University Beijing China

ISBN: (纸本)0769522238

We propose a viewer for huge point-sampled models by combining out-of-core technologies with view-dependent level-of-detail (LOd) control. This viewer is designed on the basis of a multiresolution data structure we have developed for gaze-guided visualization and transmission of 3d point sets. In order to reduce memory loads for huge point sets on general PC platforms, we introduce a partition-based out-of-core strategy to balance usage of main and external memories. At first, the data surface is partitioned into small blocks and points in each block are reorganized into error-controlled LOds by hierarchical clustering and LOd organization. In the interactive rendering process, a data block scheduling algorithm is used to realize the view-dependent paging. Experimental results show that the viewer can perform interactive visualization of huge point models on commodity graphics platforms with ease.

关键词： data visualization data structures Solid modeling Partitioning algorithms Hardware Laboratories Computer graphics Scheduling algorithm Large-scale systems Energy management

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Entire model acquisition system using handheld 3d digitizer

Entire model acquisition system using handheld 3D digitizer

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international symposium on 3d data processing visualization and transmission

作者： H. Kawasaki R. Furukawa Saitama University Saitama Japan Hiroshima City University Hiroshima Japan

In this paper, a real-time, handheld 3d model acquisition system consisting of a laser projector, a video camera and a turntable is described. The user projects a stripe of light at the 3d object by hand while rotating the object on a turntable. The projected light and LEd markers attached to the laser projector and turntable are captured by the video camera. By estimating the 3d orientation of the laser projector and the turntable angle from the 2d locations of the markers, the 3d location of the surface lit by the laser can be calculated. In addition, post-processing algorithms for refining the estimated 3d data have been proposed. The algorithm not only improves the accuracy of the 3d measurement, but also achieves to decrease the number of LEds for 3d data estimation; therefore, it significantly improves the user's convenience in scanning the object. With this system, users can measure an entire 3d object in real-time.

关键词： Laser modes Shape Real time systems Cameras Costs Iterative algorithms Light emitting diodes Surface emitting lasers Character generation Stereo vision

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A Bayesian framework for 3d models retrieval based on characteristic views

A Bayesian framework for 3D models retrieval based on charac...

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international symposium on 3d data processing visualization and transmission

作者： T.F. Ansary J.-P. Vandeborre S. Mahmoudi M. daoudi ENIC Telecom Lille I MIIRE Research Group Villeneuve d'Ascq France

The management of big databases of three-dimensional models (used in CAd applications, visualization, games, etc.) is a very important domain. The ability to characterize and easily retrieve models is a key issue for the designers and the final users. In this frame, two main approaches exist: search by example of a three-dimensional model, and search by a 2d view. We present a novel framework for the characterization of a 3d model by a set of views (called characteristic views), and an indexing process of these models with a Bayesian probabilistic approach using the characteristic views. The framework is independent from the descriptor used for the indexing. We illustrate our results using different descriptors on a collection of three-dimensional models supplied by Renault Group.

关键词： Bayesian methods Shape Cascading style sheets Indexing Information retrieval Telecommunications Visual databases design automation visualization Image databases

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A robust correlation measure for correspondence estimation

A robust correlation measure for correspondence estimation

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international symposium on 3d data processing visualization and transmission

作者： M. Trujillo E. Izquierdo Electronic Engineering Department Queen Mary University of London London UK

A median correlation for the estimation of corresponding points in stereovision is proposed. It is based on the normalised correlation coefficient using the median instead of the mean. Its performance appears to be superior than conventional correlation specially in depth discontinuities image areas. This conclusion is derived from an empirical evaluation in which the proposed correlation is compared with the normalised correlation coefficient and the sum of absolute difference. The results show that the median correlation produces higher scores and lower estimation errors.

关键词： Area measurement Noise robustness Estimation error dynamic programming Shape Size measurement Interpolation Noise measurement Image sampling data processing

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Seeing into the past: creating a 3d modeling pipeline for archaeological visualization

Seeing into the past: creating a 3D modeling pipeline for ar...

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international symposium on 3d data processing visualization and transmission

作者： P. Allen S. Feiner A. Troccoli H. Benko E. Ishak B. Smith Department of Computer Science Columbia University New York NY USA

Archaeology is a destructive process in which accurate and detailed recording of a site is imperative. As a site is exposed, documentation is required in order to recreate and understand the site in context. We have developed a 3d modeling pipeline that can assist archaeologists in the documentation effort by building rich, geometrically and photometrically accurate 3d models of the site. The modeling effort begins with data acquisition (images, range scans, GIS data, and video) and ends with the use of a sophisticated visualization tool that can be used by researchers to explore and understand the site. The pipeline includes new methods for shadow-based registration of 2d images and temporal change detection. Our multimodal augmented reality system allows users wearing head-tracked, see-through, head-worn displays to visualize the site model and associated archaeological artifacts, and to interact with them using speech and gesture.

关键词： Pipelines documentation Solid modeling Photometry data acquisition Geographic Information Systems data visualization Augmented reality displays Speech

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3d stereoscopic image pairs by depth-map generation

3D stereoscopic image pairs by depth-map generation

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international symposium on 3d data processing visualization and transmission

作者： S. Battiato A. Capra S. Curti M. La Cascia Dipartmento di Matematica ed Informatica Universitá di Catania Catania Italy Stradale Primosole 50 STMicroelectronics-AST Catania Laboratory Catania Italy DINFO Universitá degli Studi di Palermo Palermo Italy

This work presents a new unsupervised technique aimed to generate stereoscopic views estimating depth information from a single input image. Using a single input image, vanishing lines/points are extracted using a few heuristics to generate an approximated depth map. The depth map is then used to generate stereo pairs. The overall method is well suited for real time application and works also on CFA (colour filtering array) data acquired by consumer imaging devices. Experimental results on a large dataset are reported.

关键词： Image classification data mining Image generation Image reconstruction Pipelines Resumes Layout data processing data visualization Computer vision

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Metrological analysis of a procedure for the automatic 3d modeling of dental plaster casts

Metrological analysis of a procedure for the automatic 3D mo...

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international symposium on 3d data processing visualization and transmission

作者： N. Brusco M. Andreetto S. Carmignato G.M. Cortelazzo Department of Information Engineer University of Padova Italy DIMEG University of Padova Italy

As well known, in the reconstruction of the 3d models through optical systems, the errors are due to the single-view acquisition error and to the 3d modeling procedure. The latter can be ascribed to the various phases of the 3d modeling pipeline: pairwise registration, global registration, surface integration. This work examines the acquisition error as well as the errors due to an automatic procedure recently proposed for the 3d modeling of dental plaster casts. This contribution derives a simple error propagation model, rather useful for practical simulation purposes. From a general viewpoint, this contribution proposes a useful simulation of error propagation in 3d modeling, it shows the quality of an automatic 3d modeling procedure recently proposed and it shows the accuracy of 3d modeling dental plaster casts by current commercial range cameras and the considered automatic method.

关键词： dentistry Biomedical optical imaging Measurement uncertainty Cameras Metrology Calibration Information analysis Pipelines Surface reconstruction Solid modeling

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