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3D object retrieval with parametric templates 8

3D object retrieval with parametric templates

引用

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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PROBADO3D - Indexing and searching 3D CAD databases supporting planning through content-based indexing and 3D shape retrieval 10

PROBADO3D - Indexing and searching 3D CAD databases supporti...

引用

10th International Conference on Design and Decision Support Systems, DDSS 2010

作者： Blümel, Ina Berndt, René Ochmann, Sebastian Vock, Richard Wessel, Raoul German National Library of Science and Technology Hannover Germany Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Institute of Computer Science II Computer Graphics University of Bonn Germany

ISBN: (纸本)9789068141818

When modeling in 3D CAD, architects often search for already existing 3D content to complete their own design, e.g. environmental models, furniture models or detailed window profiles. 3D models are normally indexed and accessed based on textual metadata. As this metadata is expensive to obtain, PROBADO3D aims to develop workflows and tools for semi-automatic indexing of 3D models. Another goal is the development of intuitive visual search and presentation interfaces that face the needs of architects looking for 3D content. PROBADO3D is a part of the PROBADO framework designed to support multimedia objects of different domains.

关键词： Digital libraries

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Lossless compression of multi-view cultural heritage image data

Lossless compression of multi-view cultural heritage image d...

引用

2019 Eurographics Workshop on graphics and Cultural Heritage, GCH 2019

作者： Buelow, Max Von Guthe, Stefan Ritz, Martin Santos, Pedro Fellner, Dieter W. TU Darmstadt Germany Fraunhofer IGD Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680826

Photometric multi-view 3D geometry reconstruction and material capture are important techniques for cultural heritage digitalization. Capturing images of artifacts with high resolution and high dynamic range and the possibility to store them losslessly enables future proof application of this data. As the images tend to consume immense amounts of storage, compression is essential for long time archiving. In this paper, we present a lossless image compression approach for multi-view and material reconstruction datasets with a strong focus on data created from cultural heritage digitalization. Our approach achieves compression rates of 2:1 compared against an uncompressed representation and 1.24:1 when compared against Gzip. © 2019 Eurographics Association.

关键词： Image reconstruction

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Direct Elastic Unrollings of Painted Pottery Surfaces from Sparse Image Sets

Direct Elastic Unrollings of Painted Pottery Surfaces from S...

引用

2021 Eurographics Workshop on graphics and Cultural Heritage, EG GCH 2021

作者： Houska, Peter Lengauer, Stefan Karl, Stephan Preiner, Reinhold Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Graz Institute of Classics Austria

ISBN: (纸本)9783038681410

An important task in archaeological research is the comparison of painted motifs on ancient vessels and the analysis of their painting style. Ideally, the pottery objects are available as scanned 3D models, from which the painted surface can be unrolled and potential distortions minimized, so that the vase painting and its individual motifs can be directly inspected. Unfortunately, the percentage of digitally captured vessels is small compared to the large body of cataloged photographs. In this paper, we present a method that creates distortion-minimized unrollings of painted pottery surfaces directly from a small set of photographs. We achieve this by exploiting prior knowledge about the data, namely that most objects exhibit rotational symmetry and that strict guidelines were followed when capturing photographs of the ancient vases. Based on the distinctly visible object silhouettes in the photographs we are able to extract proxy geometries of the objects which we encode as per-view geometric maps. By stitching the single-view data, we obtain a combined map capturing the geometry and texture of the entire painted surface. This enables us to minimize typical projective distortions by elastic relaxation. Our pipeline works entirely in 2D image space, circumventing time-consuming 3D scans and surface reconstructions of (often inaccessible) vessels. Using a combination of CPU-based image processing and GPU-based relaxation, results are produced in only a few minutes. © 2021 The Eurographics Association.

关键词： Geometry

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Interaction analysis: An algorithm for interaction prediction and activity recognition in adaptive systems

Interaction analysis: An algorithm for interaction predictio...

引用

2010 IEEE International Conference on Intelligent Computing and Intelligent Systems, ICIS 2010

作者： Nazemi, Kawa Stab, Christian Fellner, Dieter W. 3D Knowledge Worlds and Semantics Visualization Fraunhofer Institute for Computer Graphics Research 64283 Darmstadt Germany

ISBN: (纸本)9781424465835

Predictive statistical models are used in the area of adaptive user interfaces to model user behavior and to infer user information from interaction events in an implicit and non-intrusive way. This information constitutes the basis for tailoring the user interface to the needs of the individual user. Consequently, the user analysis process should model the user with information, which can be used in various systems to recognize user activities, intentions and roles to accomplish an adequate adaptation to the given user and his current task. In this paper we present the improved prediction algorithm KO*/19, which is able to recognize, beside interaction predictions, behavioral patterns for recognizing user activities. By means of this extension, the evaluation shows that the KO*/19-Algorithm improves the Mean Prediction Rank more than 19% compared to other well-established prediction algorithms. ©2010 IEEE.

关键词： User interfaces

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

引用

2011 8th IEEE International Conference on Advanced Video and Signal Based Surveillance, AVSS 2011

作者： Roth, Peter M. Settgast, Volker Widhalm, Peter Lancelle, Marcel Birchbauer, Josef Brändle, Norbert Havemann, Sven Bischof, Horst Graz University of Technology Institute for Computer Graphics and Vision Austria Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria Austrian Institute of Technology Dynamic Transportation Systems Austria Austria

ISBN: (纸本)9781457708459

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. © 2011 IEEE.

关键词： visualization

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Towards Crowd-Sourced Collaborative Fragment Matching

Towards Crowd-Sourced Collaborative Fragment Matching

引用

2023 Eurographics Workshop on graphics and Cultural Heritage, GCH 2023

作者： Houska, P. Kloiber, S. Masur, A. Lengauer, S. Karl, S. Preiner, R. Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria University of Graz Institute of Classics Austria

ISBN: (纸本)9783038682172

Many artifacts of our archaeological heritage are preserved only in fragments. The reassembly of these parts to their original form is therefore an essential task for archaeologists. Our project aims at incorporating the intellect of many participants from the broad public in the solution of this complex task. To this end, we develop a web-based 3D environment, in which users can interactively and collaboratively reassemble virtual fragments of real-world artifacts, supported by computer-aided methods. Our primary research focus lies on identifying how to best design and setup such a system in order to maximize the collaboration efficiency. By participating in this open reassembly process, users can gain valuable insight into the archaeological task, thus raising awareness for our common cultural heritage in a multitude of people. © ISVR,2023 *** rights reserved

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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...

引用

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

Evaluation of guidance systems in public infrastructures usi...

引用

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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A distributed object repository for cultural heritage 11

A distributed object repository for cultural heritage

引用

11th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2010

作者： Pan, X. Beckmann, P. Havemann, S. Tzompanaki, K. Doerr, M. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria Institute of Computer Science FORTH Crete Greece TU Darmstadt Fraunhofer IGD Germany

ISBN: (纸本)9783905674293

This paper describes the design and the implementation of a distributed object repository that offers cultural heritage experts and practitioners a working platform to access, use, share and modify digital content. The principle of collecting paradata to document each step in a potentially long sequence of processing steps implies a number of design decisions for the data repository, which are described and explained. Furthermore, we provide a description of the concise API our implementation. Our intention is to provide an easy-to-understand recipe that may be valuable also for other data repository implementations that incorporate and operationalize the more theoretical concepts of intellectual transparency, collecting paradata, and compatibility to semantic networks. © The Eurographics Association 2010.

关键词： Semantics

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