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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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CROSS-MODAL SEARCH AND EXPLORATION OF GREEK PAINTED POTTERY

arXiv

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arXiv 2023年

作者： Trinkl, Elisabeth Karl, Stephan Lengauer, Stefan Preiner, Reinhold Schreck, Tobias University of Graz Institute of Classics Austria Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

This paper focuses on digitally-supported research methods for an important group of cultural heritage objects, the Greek pottery, especially with figured decoration. The design, development and application of new digital methods for searching, comparing, and visually exploring these vases needs an interdisciplinary approach to effectively analyse the various features of the vases, like shape, decoration, and manufacturing techniques, and relationships between the vases. We motivate the need and opportunities by a multimodal representation of the objects, including 3D shape, material, and painting. We then illustrate a range of innovative methods for these representations, including quantified surface and capacity comparison, material analysis, image flattening from 3D objects, retrieval and comparison of shapes and paintings, and multidimensional data visualization. We also discuss challenges and future work in this area. Copyright © 2023, The Authors. All rights reserved.

关键词： Three dimensional computer graphics

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File-formats for preservation: Evaluating the long-term stability of file-formats

File-formats for preservation: Evaluating the long-term stab...

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11th International Conference on Electronic Publishing, ELPUB 2007

作者： Rauch, Carl Krottmaier, Harald Tochtermann, Klaus Styria Media AG Schönaugasse 64 8010 Graz Austria Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Infeldgasse 16c 8010 Graz Austria Knowledge Management Institute Graz University of Technology and Know-Center Graz Infeldgasse 21/II 8010 Graz Austria

ISBN: (纸本)9783854372929

While some file-formats become unreadable after short periods, others remain interpretable over a long-term. Among the over 1.000 file-formats, some are better and some are less suited for long-term preservation. A standardized process for evaluating the stability of a file-format is described in this paper and its practical use is shown with file-formats for 3D-objects. Recommendations to users of 3D-applications are given in the last section of this article. Some of the results are used in PROBADO, a sophisticated search engine for nontraditional objects (such as 3D-documents, music etc.).

关键词： Search engines

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Interactive Physics-Based Deformation for Virtual Worlds

Interactive Physics-Based Deformation for Virtual Worlds

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International Conference on Cyberworlds

作者： Andreas Riffnaller-Schiefer Ursula H. Augsdörfer Dieter W. Fellner Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Fraunhofer IGD TU Darmstadt Germany

When creating immersive interactive virtual worlds, it is important to not only provide plausible visuals, but also to allow the user to interact with the virtual scene in a natural way. While rigid-body physics simulations are widely used to provide basic interaction, realistic soft-body deformations of virtual objects are challenging and therefore typically not *** present a client-server architecture for interactive physics-based deformation, which makes it possible to add physically accurate response to interaction to any virtual environment. The architecture is highly flexible, can be used from any web enabled client, and facilitates synchronization of computed deformations across multiple users and devices.

关键词： Computational modeling Mathematical model Solid modeling Strain Geometry computer architecture Servers

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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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A scalable repository infrastructure for CH digital object management

A scalable repository infrastructure for CH digital object m...

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International Conference on Virtual Systems and MultiMedia

作者： X. Pan T. Schiffer M. Schröttner S. Havemann M. Hecher R. Berndt D. W. Fellner Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria Fraunhofer Austria Research Visual Computing Graz Austria

In recent decades, researchers of archaeological 3D digitalization found that the collection and archive of processing intermediate data are extremely tiresome tasks. They need large of man power and material resources, even though, mistakes can be raised and break the whole working chain. The traditional documentation of digitalization process is also a pending challenge, although, the ISO standard CIDOC-CRM (ISO 21127:2006) has been introduced to the archaeologists and museum professionals since years, but there are still some obvious gaps between practice and theory: (1) How to connect the discrete archaeologists, museums, CH research institutions, and the public? (2) How to ensure the integrity of whole digitalization process and simplify the process? (3) How to maximize the usability of the public digital objects in CH community? (4) How to long term preserve the huge amount of datasets? (5) How to present and disseminate the digital object to the public? This paper presents an operational and optimal infrastructure that realizes not only a distributed storage system, but also a content management system. This infrastructure works as a backbone of whole digitalization process, provides a complete solution suite for archaeologists, museum professionals, museum visitors, and IT technicians.

关键词： Solid modeling Databases Servers Semantics Data models Usability System analysis and design

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Peter M. Roth Volker Settgast Peter Widhalm Marcel Lancelle Josef Birchbauer Norbert Brändle Sven Havemann Horst Bischof Graz University of Technology Institute for Computer Graphics and Vision Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austrian Institute of Technology Dynamic Transportation Systems Siemens AG Österreich Corporate Technology (CT T CEE) Austria

Existing visual surveillance systems typically require that human operators observe video streams from different cameras, which becomes infeasible if the number of observed cameras is ever increasing. In this paper, we present a new surveillance system that combines automatic video analysis (i.e., single person tracking and crowd analysis) and interactive visualization. Our novel visualization takes advantage of a high resolution display and given 3D information to focus the operator's attention to interesting/ critical areas of the observed area. This is realized by embedding the results of automatic scene analysis techniques into the visualization. By providing different visualization modes, the user can easily switch between the different modes and can select the mode which provides most information. The system is demonstrated for a real setup on a university campus.

关键词： Cameras Three dimensional displays visualization Surveillance Solid modeling Trajectory

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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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Integrating multimedia repositories into the PROBADO framework

Integrating multimedia repositories into the PROBADO framewo...

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International Conference on Digital Information Management (ICDIM)

作者： Ina Blumel Jurgen Diet Harald Krottmaier German National Library of Science and Technology TIB Hanover Germany Bavarian State Library Munich Germany Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria

In this paper, we describe a digital library initiative for non-textual documents. The proposed framework will integrate different types of content-repositories - each one specialized for a specific multimedia domain - into one seamless system and will add features such as automatic annotation, full-text retrieval and recommender services to non-textual documents. Two multimedia domains, 3D graphics and music, will be introduced. The repositories can be searched using both textual (metadata-based) and non-textual retrieval mechanisms (e.g. using a complex sketch-based interface for searching in 3D-models or a query-by-humming interface for music). Domain-specific metadata models are developed and workflows for automated content-based data analysis and indexing proposed.

关键词： Software libraries Indexing Music information retrieval Content based retrieval Data analysis Text analysis computer graphics visualization Multimedia systems Content management

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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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