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A context-oriented RDF Database 1

A context-oriented RDF Database

引用

1st International Conference on Semantic Web and Databases, SWDB 2003

作者： Tazari, Mohammad-Reza Computer Graphics Center Dept. Mobile Information Visualization Fraunhoferstraße 5 Darmstadt64283 Germany

The importance of contextual knowledge in knowledge management and organizational memory is shown in topical literature. Even in an initial visionary scenario for the Semantic Web, one can immediately encounter the contextual knowledge needed to realize the necessary services. Hence, it is not inappropriate to claim that context management is an integral service of the Semantic Web. After discussing the distributed nature of contextual knowledge, we define some requirements for a context-oriented database service and then introduce CORD as a service satisfying those requirements based on the Semantic Web technologies. Selected features of CORD that provide some contribution to the discussions within the Semantic Web research community, like embedded resources, query language, and definition of rules, are discussed in some detail.

关键词： Query languages

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A virtual reality medical training system 1st

A virtual reality medical training system

引用

1st International Conference on computer Vision, Virtual Reality, and Robotics in Medicine, CVRMed 1995

作者： Ziegler, Rolf Mueller, Wolfgang Fischer, Georg Goebel, Martin Fraunhofer Institute for Computer Graphics Department Visualization and Simulation Wilhelminenstr. 7 DarmstadtD-64283 Germany

ISBN: (纸本)9783540591207

This paper presents the result of the interdisciplinary cooperation of traumatologists of the Berufsgenossenschaftliche Unfallklinik (BGU) in Frankfurt am Main and a team of computer graphics scientists of the Fraunhofer Institute for computer graphics in Darmstadt. We have developed a highly interactive medical training simulator system for arthroscopy by means of computer graphics and Virtual Reality techniques. This system offers an effective alternative to conventional training systems for training and establishing of arthroscopic techniques. The two main development tasks will be discussed: the 3D reconstruction process and the 3D interaction. © Springer-Verlag Berlin Heidelberg 1995.

关键词： Virtual reality

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The pull-push algorithm revisited: Improvements,computation of point densities,and GPU implementation

The pull-push algorithm revisited: Improvements,computation ...

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4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Kraus, Martin Computer Graphics and Visualization Group Technische Universität München Boltzmannstrae 3 85748 Garching Germany

ISBN: (纸本)9789898111678

The pull-push algorithm is a well-known and very efficient pyramid algorithm for the interpolation of scattered data with many applications in computer ***,the original algorithm is not very well suited for an implementation on GPUs (graphics processing units).In this work,several improvements of the algorithm are presented to overcome this limitalion,and important details of the algorithm are clarified,in particular the importance of the correct normalization of the employed ***,we present an extension for a very efficient estimate of the local density of sample points.

关键词： graphics processing unit

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Learning a perceptual quality metric for correlation in scatterplots

Learning a perceptual quality metric for correlation in scat...

引用

2019 Conference on Vision, Modeling and visualization, VMV 2019

作者： Wöhler, L. Zou, Y. Mühlhausen, M. Albuquerque, G. Magnor, M. Computer Graphics Lab TU Braunschweig Germany Software for Space Systems and Interactive Visualization DLR Braunschweig Germany

ISBN: (纸本)9783038680987

Visual quality metrics describe the quality and efficiency of multidimensional data visualizations in order to guide data analysts during exploration tasks. Current metrics are usually based on empirical algorithms which do not accurately represent human perception and therefore often differ from the analysts’ expectations. We propose a new perception-based quality metric using deep learning that rates the correlation of data dimensions visualized by scatterplots. First, we created a data set containing over 15, 000 pairs of scatterplots with human annotations on the perceived correlation between the data dimensions. Afterwards, we trained two different Convolutional Neural Networks (CNN), one extracts features from scatterplot images and the other directly from data vectors. We evaluated both CNNs on our test set and compared them to previous visual quality metrics. The experiments show that our new metric is able to represent human perception more accurately than previous methods. © 2019 The Author(s) Eurographics Proceedings © 2019 The Eurographics Association.

关键词： Deep learning

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Interactive deformations with multigrid skeletal constraints

Interactive deformations with multigrid skeletal constraints

引用

7th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2010

作者： Georgii, J. Lagler, D. Dick, C. Westermann, R. Computer Graphics and Visualization Group Technische Universität München Germany Fraunhofer MEVIS Bremen Germany

ISBN: (纸本)9783905673784

In this paper we present an interactive method for simulating deformable objects using skeletal constraints. We introduce a two-way coupling of a finite element model and a skeleton that is attached to this model. The skeleton pose is determined via inverse kinematics. The target positions of joints are either given by user interactions or forces imposed by the surrounding deformable body. The movement of the deformable body either follows the movement of the skeleton thereby respecting physical constraints imposed by the underlying deformation model, or the movement is determined from user-defined external forces. Due to the proposed two-way coupling, the skeleton and the deformable body constrain each other's movement, thus allowing for an intuitive and realistic animation of soft bodies. To realize the two-way coupling we propose the efficient embedding of the constraints into a geometric multigrid scheme to solve the governing equations of deformable body motion. We present a greedy approach that propagates the constraints to coarser hierarchy levels, and we show that this approach can significantly improve the convergence rate of the multigrid solver. © The Eurographics Association 2010.

关键词： Inverse kinematics

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PNG1 triangles for tangent plane continuous surfaces on the GPU

PNG1 triangles for tangent plane continuous surfaces on the ...

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graphics Interface 2008

作者： Fünfzig, Christoph Müller, Kerstin Hansford, Dianne Farin, Gerald PRISM Lab Arizona State University Tempe United States Computer Graphics and Visualization University Kaiserslautern Germany

ISBN: (纸本)9781568814230

Improving the visual appearance of coarse triangle meshes is usually done with graphics hardware with per-pixel shading techniques. Improving the appearance at silhouettes is inherently hard, as shading has only a small influence there and the geometry must be corrected. With the new geometry shader stage released with DirectX 10, the functionality to generate new primitives from an input primitive is available. Also the shader can access a restricted primitive neighborhood. In this paper, we present a curved surface patch that can deal with this restricted data available in the geometry shader. A surface patch is defined over a triangle with its vertex normals and the three edge neighbor triangles. Compared to PN triangles, which define a curved patch using just the triangle with its vertex normals, our surface patch is G1 continuous with its three neighboring patches. The patch is obtained by blending two cubic Bézier patches for each triangle edge. In this way, our surface is especially suitable for efficient, high-quality tessellation on the GPU. We show the construction of the surface and how to add special features such as creases. Thus, the appearance of the surface patch can be fine-tuned easily. The surface patch is easy to integrate into existing polygonal modeling and rendering environments. We give some examples using Autodesk Maya.

关键词： graphics processing unit

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Elastic flattening of painted pottery surfaces

Elastic flattening of painted pottery surfaces

引用

2018 Eurographics Workshop on graphics and Cultural Heritage, GCH 2018

作者： Preiner, Reinhold Karl, Stephan Baye, Paul Schreck, Tobias Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Graz Department of Archaeology Austria

ISBN: (纸本)9783038680574

Generating flat images from paintings on curved surfaces is an important task in Archaeological analysis of ancient pottery. It allows comparing styles and painting techniques, e.g, for style and workshop attribution, and serves as basis for domain publications which typically use 2d images. To obtain such flat images from scanned textured 3d models of the pottery objects, current practice is to perform so-called rollouts using approximating shape primitives like cones or spheres, onto which the mesh surfaces are projected. While this process provides in intuitive deformation metaphor for the users, it naturally introduces unwanted distortions in the mapping of the surface, especially for vessels with high-curvature profiles. In this work, we perform an elastic flattening of these projected meshes, where stretch energy is minimized by simulating a physical relaxation process on a damped elastic spring model. We propose an intuitive contraction-directed physical setup which allows for an efficient relaxation while ensuring a controlled convergence. Our work has shown to produce images of significantly improved suitability for domain experts' tasks like interpretation, documentation and attribution of ancient pottery. © 2018 GCH 2018 - Eurographics Workshop on graphics and Cultural Heritage. All rights reserved.

关键词： Textures

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Direct limit volumes: Constant-time limit evaluation for Catmull-clark solids 26

Direct limit volumes: Constant-time limit evaluation for Cat...

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26th Pacific Conference on computer graphics and Applications, Pacific graphics 2018

作者： Altenhofen, C. Müller, J. Weber, D. Stork, A. Fellner, D.W. Fraunhofer Institute for Computer Graphics Research IGD Darmstadt Germany Technische Universität Darmstadt Darmstadt Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Graz Austria

ISBN: (纸本)9783038680734

We present a novel approach for efficient limit volume evaluation on Catmull-Clark (CC) subdivision solids. Although several analogies exist between subdivision surfaces and subdivision volumes, extending Stam’s limit evaluation technique from 2 to 3 dimensions is not straightforward, as irregularities and boundaries introduce new challenges in the volumetric case. We present new direct evaluation techniques for irregular volumetric topologies and boundary cells, which allow for calculating the limit of CC subdivision solids at arbitrary parameter values in constant time. Evaluation of limit points is a central aspect when using CC solids for applications such as simulation and multi-material additive manufacturing, or as a compact volumetric representation scheme for continuous scalar fields. We demonstrate that our approach is faster than existing evaluation techniques for every topological configuration or target parameter (u, v, w) that requires more than two local subdivision steps. © 2018 The Author(s).

关键词： Topology

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Surface digitizations by dilations which are tunnel-free

Surface digitizations by dilations which are tunnel-free

引用

9th International Conference on Discrete Geometry for computer Imagery, DGCI 2000

作者： Lincke, Christoph Wüthrich, Charles A. Computer Graphics Visualization Man-Machine Communication Group Faculty of Media Bauhaus University Weimar 99421 Weimar Germany

ISBN: (纸本)3540413960

In this article we study digital topology with methods from mathematical morphology. We introduce reconstructions by dilations with appropriate continuous structural elements and prove that notions known from digital topology can be defined by continuous properties of this reconstruction. As a consequence we determine the domains for tunnel-free surface digitizations. It will be proven that the supercover and the grid-intersection digitization of every surface with or without boundary is always tunnel-free. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Mathematical morphology

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Robust shape fitting and semantic enrichment 21

Robust shape fitting and semantic enrichment

引用

21st International CIPA Symposium 2007

作者： Ullrich, Torsten Fellner, Dieter W. Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Inffeldgasse 16c GrazA-8010 Austria

A robust fitting and reconstruction algorithm has to cope with two major problems. First of all it has to be able to deal with noisy input data and outliers. Furthermore it should be capable of handling multiple data set mixtures. The decreasing exponential approach is robust towards outliers and multiple data set mixtures. It is able to fit a parametric model to a given point cloud. As parametric models use a description which may not only contain a generative shape but information about the inner structure of an object, the presented approach can enrich measured data with an ideal description. This technique offers a wide range of applications. © 2007 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Mixtures

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