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Foreword to the special section on 3D object retrieval 2024 symposium (3DOR2024)

computers and graphics 2025年 129卷

作者： Bustos, Benjamin Biasotti, Silvia Veltkamp, Remco C. Schreck, Tobias Sipiran, Ivan Department of Computer Science University of Chile Chile Millennium Institute Foundational Research on Data (IMFD) Chile Istituto di Matematica Applicata e Tecnologie Informatiche “E. Magenes” - CNR Italy Department of Information and Computing Sciences Utrecht University Netherlands Institute of Computer Graphics and Visualization Technical University of Graz Austria

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Robust shape fitting and semantic enrichment 21

Robust shape fitting and semantic enrichment

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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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Efficient Point Cloud Skeletonization with Locally Adaptive L1-Medial Projection 30

Efficient Point Cloud Skeletonization with Locally Adaptive ...

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30th International Conference in Central Europe on computer graphics, visualization and computer Vision, WSCG 2022

作者： Lengauer, Stefan Houska, Peter Preiner, Reinhold Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Inffeldgasse 16c Graz8010 Austria

ISBN: (纸本)9788086943336

3D line skeletons are simplistic representations of a shape's topology which are used for a wide variety of geometry-processing tasks, including shape recognition, retrieval, and reconstruction. Numerous methods have been proposed to generate a skeleton from a given 3D shape. While mesh-based methods can exploit existing knowledge about the shape's topology and orientation, point-based techniques often resort to precomputed per-point normals to ensure robustness. In contrast, previously proposed techniques for unprocessed point clouds either exhibit inferior robustness or require expensive operations, which in turn increases computation time. In this paper, we present a new and highly efficient skeletonization approach for raw point cloud data, which produces overall competitive results compared to previous work, while exhibiting much lower computation times. Our algorithm performs robustly in the face of noisy and fragmented inputs, as they are usually obtained from real-world 3D scans. We achieve this by first transferring the input point cloud into a Gaussian mixture model (GMM), obtaining a more compact representation of the surface. Our method then iteratively projects a small subset of the points into local L1-medians, yielding a rough outline of the shape's skeleton. Finally, we present a new branch detection technique to obtain a coherent line skeleton from those projected points. We demonstrate the capabilities of our proposed method by extracting the line skeletons of a diverse selection of input shapes and evaluating their visual appearance as well as the efficiency compared to alternative state-of-the-art methods. © 2022 University of West Bohemia. All rights reserved.

关键词： Topology

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Direct Elastic Unrollings of Painted Pottery Surfaces from Sparse Image Sets

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

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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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Using SVG for an user-interface to a digital library

Using SVG for an user-interface to a digital library

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10th International Conference on Electronic Publishing, ELPUB 2006

作者： Krottmaier, Harald Scherngell, Christian Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Infeldgasse 16c 8010 Graz Austria

ISBN: (纸本)9789541600405

Interfaces for users on the web are usually created using standard HTML-technologies. Although dynamic text-based features are widely available on the web (e.g. by using DHTML) there are still some limitations in the user experience when using dynamic graphical elements. In this article we focus on a GUI-prototype using Scalable Vector graphics (SVG) as an interface to an existing Digital Library. First we describe the current situation of the running system and explain some of the limitations in the GUI. Thereafter we compare the document-format with other electronic formats. An overview of the prototype and a description of the used framework will be given in the main section of this article. Finally we are going to show an improved version of a search task using an SVG-category viewer. The currently supported SVG-recommendation (SVG 1.1) by the SVG-plugins have some limitations. The upcoming release will solve some of the problems and introduce new features related to data-handling and database access. An outlook of these new features and lessons learned in implementing the prototype will close the article.

关键词： Graphical user interfaces

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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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Lossless compression of multi-view cultural heritage image data

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

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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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A distributed object repository for cultural heritage 11

A distributed object repository for cultural heritage

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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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Zoomable user interfaces in scalable vector graphics

Zoomable user interfaces in scalable vector graphics

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5th Annual Conference on Scalable Vector graphics, SVG Open 2007

作者： Rotard, Martin Eissele, Mike Van Putten, Raul Ertl, Thomas Researcher in Computer Graphics and Human Computer Interaction University of Stuttgart Visualization and Interactive Systems Institute Universitaetsstr. 30 Stuttgart 70569 Germany

Zoomable user interfaces are an evolutionary outgrowth of graphical user interfaces. In this paper we propose a zoomable user interface based on Scalable Vector graphics. Three-level zooming is proposed as a new paradigm to combine different zooming functionalities in a common interface and support zooming within the window manager. This helps to unify zooming techniques of different applications. To meet the demand of efficient and easy navigation on a user interface, several novel interaction techniques are shown that further support the integration of three-level zooming within the underlying presentation system. For mobile small-screen devices, where the benefit of zooming user interfaces is even higher, the proposed system can be operated with simple pen tap or tap and drag operations. We also present a prototypical implementation, which demonstrates how applications based on the SPARK toolkit can transparently benefit form the proposed technology.

关键词： Graphical user interfaces

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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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