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International Conference on Technology and Innovation in Sports, Health and Wellbeing (TISHW)

作者： Manuel Stein Halldór Janetzko Andreas Lamprecht Daniel Seebacher Tobias Schreck Daniel Keim Michael Grossniklaus Department of Computer and Information Science University of Konstanz Institute for Computer Graphics and Knowledge Visualization Graz University of Technology

ISBN: (纸本)9781509057283

Sport analytics in general and soccer analytics in particular constitute quickly growing markets when it comes to professional analyses and visualizations. From a data analysis research perspective, soccer is a rich source of geospatial and temporal movement data, with high details and a controlled environment. However, soccer movement is complex as its compounds are actions and reactions of two opposing teams with inverse goals. Common analyses performed today are typically oriented towards statistical analysis and considering aggregate measurements. In this work, we propose a set of effective visual-interactive methods for investigating set plays as a first step towards semi-automated analysis of tactic behavior. In our analytic design, we follow the so-called Information-seeking Mantra by Ben Shneiderman by providing overview visualizations, interactive refinements, and detailed analysis views. We take an applied approach in showing case studies that give evidence for the applicability and merits of our proposed techniques.

关键词： Data visualization visualization Technological innovation Games Data analysis Computational modeling Analytical models

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RDEPS: A combined Reaction-Diffusion Equation and Photometric Similarity filter for optical image restoration 12th

RDEPS: A combined Reaction-Diffusion Equation and Photometri...

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12th International Symposium on Visual Computing, ISVC 2016

作者： Zhao, Xueqing Mavridis, Pavlos Schreck, Tobias Kuijper, Arjan School of Computer Science Xi’an Polytechnic University Xi’an710048 China Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Graz8010 Austria Fraunhofer IGD Darmstadt64283 Germany Technische Universität Darmstadt Darmstadt64289 Germany

ISBN: (纸本)9783319508313

Restoration of optical images degraded by atmospheric turbulence and various types of noise is still an open problem. In this paper, we propose an optical image restoration method based on a Reaction- Diffusion Equation and Photometric Similarity (RDEPS). We exploit photometric similarity and geometric closeness of the optical image by combining a photometric similarity function and a appropriately defined reaction-diffusion equation. Our resulting RDEPS filter is used to restore images degraded by atmospheric turbulence and noise, including Gaussian noise and impulse noise. Extensive experimental results show that our method outperforms other recently developed methods in terms of PSNR and SSIM. Moreover, the computational efficiency analysis shows that our RDEPS provides efficient restoration of optical images. © Springer International Publishing AG 2016.

关键词： Image reconstruction

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Procedural Modeling of Round Building Geometry

Procedural Modeling of Round Building Geometry

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International Conference on Cyberworlds

作者： Johannes Edelsbrunner Sven Havemann Alexei Sourin Dieter W. Fellner Institute for Computer Graphics and Knowledge Visualization (CGV) Graz University of Technology Graz Austria School of Computer Science and Engineering Nanyang Technological University Singapore Fraunhofer IGD TU Darmstadt Darmstadt Germany

Creation of procedural 3D building models can significantly lessen the costs of modeling, since it allows generating a variety of similar shapes from one procedural description. The common field of application for procedural modeling is modeling of straight building facades, which are very well suited for shape grammars – a special kind of procedural modeling system. In order to generate round building geometry, we present a way to setup different coordinate systems in shape grammars. Besides Cartesian, these are primarily cylindrical and spherical coordinate systems for generation of structures like towers or domes, that can procedurally adapt to different dimensions and parameters. The users can apply common splitting idioms from shape grammars in their familiar way, for creating round instead of straight geometry.

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3D object retrieval with parametric templates 8

3D object retrieval with parametric templates

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8th Eurographics Workshop on 3D Object Retrieval, 3DOR 2015

作者： Getto, Roman Fellner, Dieter W. Interactive Graphics Systems Group TU Darmstadt Germany Fraunhofer IGD Darmstadt Germany Institute of Computer Graphics and Knowledge Visualization TU Graz Austria

ISBN: (纸本)9783905674781

We propose a 3D object retrieval system which uses parametric templates as prior knowledge for the retrieval. A parametric template represents an object-domain and a semantic concept like 'chair' or 'plane' or a more specific concept like 'dining-char' or 'biplane'. The template can be specified at a general or specific level and can even equal actual retrieved objects. The parametric template is composed of several input parameters and an operation chain which constructs an object. Different parameter combinations lead to different object instances. We combine and evaluate a paramteric template with different descriptors. Our results show that the usage of parametric templates can raise the retrieval performance significantly. © The Eurographics Association 2015.

关键词： Semantics

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Evaluation of guidance systems in public infrastructures using eye tracking in an immersive virtual environment 2

Evaluation of guidance systems in public infrastructures usi...

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2nd International Workshop on Eye Tracking for Spatial Research, ET4S 2014, Co-located with the 8th International Conference on Geographic Information Science, GIScience 2014

作者： Schrom-Feiertag, Helmut Schinko, Christoph Settgast, Volker Seer, Stefan Austrian Institute of Technology Vienna Austria Institute of Computer Graphics and Knowledge Visualization TU Graz Austria Fraunhofer Austria Graz Austria

In this paper we present a novel method to evaluate guidance systems and navigation solutions for public infrastructures based on an immersive virtual environment in combination with a mobile eye tracking system. It opens new opportunities for wayfinding studies in public infrastructures already during the planning phase. Our approach embeds an interface for natural locomotion in the virtual environment offering significant advantages related to the user's spatial perception as well as physical and cognitive demands. Accurate measurements of position, locomotion and gaze within the virtual environment enable a great simplification for the analysis of eye tracking data. We conducted a study with participants that included virtual and real world scenarios within a train station. First results exhibit similar behaviour of participants in the real and virtual environment, confirming the comparability and applicability of our method.

关键词： Eye tracking

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Procedural shape modeling in digital humanities: Potentials and issues

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8355卷 64-77页

作者： Havemann, Sven Wagener, Olaf Fellner, Dieter Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Fraunhofer IGD and TU Darmstadt Germany Institut fur Europaische Kunstgeschichte University of Heidelberg Germany

Procedural modeling is a technology that has great potential to make the abundant variety of shapes that have to be dealt with in Digital Humanities accessible and understandable. There is a gap, however, between technology on the one hand and the needs and requirements of the users in the Humanities community. In this paper we analyze the reasons for the limited uptake of procedural modeling and sketch possible ways to circumvent the problem. The key insight is that we have to find matching concepts in both fields, which are on the one hand grounded in the way shape is explained, e.g., in art history, but which can also be formalized to make them accessible to digital computers. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Image reconstruction

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Constructive Roof Geometry

Constructive Roof Geometry

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International Conference on Cyberworlds

作者： Johannes Edelsbrunner Ulrich Krispel Sven Havemann Alexei Sourin Dieter W. Fellner Institute for Computer Graphics and Knowledge Visualization (CGV) Graz University of Technology Graz Austria Fraunhofer Austria Research GmbH School of Computer Engineering Nanyang Technological University Singapore Graphisch-Interaktive System (GRIS) Darmstadt Germany Fraunhofer IGD TU Darmstadt Darmstadt Germany

While the growing demand for new building models contained in virtual worlds, games, and movies, makes the easy and fast creation of modifiable models more and more important, 3D modeling of buildings can be a tedious task due to their sometimes complex geometry. For historic buildings, especially the roofs can be challenging. We present a new method of combining simple building solids to form more complex buildings, and give an emphasis on the blending of roof faces. This can be integrated in common pipelines for procedural modeling of buildings and will bring more expressiveness than existing methods.

关键词： Buildings Solids Geometry Solid modeling Skeleton Three-dimensional displays Shape

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Implicit mesh generation using volumetric subdivision 13

Implicit mesh generation using volumetric subdivision

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13th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2017

作者： Altenhofen, C. Schuwirth, F. Stork, A. Fellner, D. TU Darmstadt Germany Fraunhofer IGD Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680321

In this paper, we present a novel approach for a tighter integration of 3D modeling and physically-based simulation. Instead of modeling 3D objects as surface models, we use a volumetric subdivision representation. Volumetric modeling operations allow designing 3D objects in similar ways as with surface-based modeling tools. Encoding the volumetric information already in the design mesh drastically simplifies and speeds up the mesh generation process for simulation. The transition between design, simulation and back to design is consistent and computationally cheap. Since the subdivision and mesh generation can be expressed as a precomputable matrix-vector multiplication, iteration times can be greatly reduced compared to common modeling and simulation setups. Therefore, this approach is especially well suited for early-stage modeling or optimization use cases, where many geometric changes are made in a short time and their physical effect on the model has to be evaluated frequently. To test our approach, we created, simulated and adapted several 3D models. Additionally, we measured and evaluated the timings for generating and applying the matrices for different subdivision levels. For comparison, we also measured the tetrahedral meshing functionality offered by CGAL for similar numbers of elements. For changing topology, our implicit meshing approach proves to be up to 70 times faster than creating the tetrahedral mesh only based on the outer surface. Without changing the topology and by precomputing the matrices, we achieve a speed-up of up to 2800. © 2017 The Author(s) Eurographics Proceedings 2017 The Eurographics Association.

关键词： Mesh generation

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Optimization of an autostereoscopic display for a driving simulator

Optimization of an autostereoscopic display for a driving si...

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International Conference on computer graphics Theory and Applications, GRAPP 2013 and International Conference on Information visualization Theory and Applications, IVAPP 2013

作者： Eggeling, Eva Fellner, Dieter W. Halm, Andreas Ullrich, Torsten Fraunhofer Austria Research GmbH Inffeldgasse 16c Graz Austria Institute of Computer Graphics and Knowledge Visualization TU Graz Graz Austria GRIS TU Darmstadt and Fraunhofer IGD Darmstadt Germany

ISBN: (纸本)9789898565464

In this paper, we present an algorithm to optimize a 3D stereoscopic display based on parallax barriers for a driving simulator. The main purpose of the simulator is to enable user studies in reproducible laboratory conditions to test and evaluate driving assistance systems. The main idea of our optimization approach is to determine by numerical analysis the best pattern for an autostereoscopic display with the best image separation for each eye, integrated into a virtual reality environment. Our implementation uses a differential evolution algorithm, which is a parallel, direct search method based on evolution strategies, because it converges fast and is inherently parallel. This allows an execution on a network of computers. The resulting algorithm allows optimizing the display and its corresponding pattern, such that a single user in the simulator environment sees a stereoscopic image without being supported by special eye-wear.

关键词： Global optimization

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Deformation-Aware Split Grammars for Architectural Models

Deformation-Aware Split Grammars for Architectural Models

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International Conference on Cyberworlds

作者： René Zmugg Wolfgang Thaller Ulrich Krispel Johannes Edelsbrunner Sven Havemann Dieter W. Fellner Institute for Computer Graphics and Knowledge Visualization (CGV) Graz University of Technology Graz Austria Graphisch-Interaktive Systeme (GRIS) TU Darmstadt Darmstadt Germany Fraunhofer IGD TU Darmstadt Darmstadt Germany

With the current state of video games growing in scale, manual content creation may no longer be feasible in the future. Split grammars are a promising technology for large scale procedural generation of urban structures, which are very common in video games. Buildings with curved parts, however, can currently only be approximated by static pre-modeled assets, and rules apply only to planar surface parts. We present an extension to current split grammar systems that allows the generation of curved architecture through free-form deformations that can be introduced at any level in a grammar. Further subdivision rules can then adapt to these deformations to maintain length constraints, and repetitions can adjust to more or less space.

关键词： Shape Grammar Geometry Buildings Adaptation models Games computer architecture

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