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2007 IADIS International Conference on computer graphics and visualization, CGV 2007, part of the 1st IADIS Multi Conference on computer Science and Information Systems, MCCSIS 2007

作者： Georgii, Joachim Krüger, Jens Westermann, Rüdiger Computer Graphics & Visualization Group Technische Universität München Boltzmannstr. 3 Garching85748 Germany

ISBN: (纸本)9789728924393

If two closed polygonal objects with outfacing normals intersect each other there exist one or more lines that intersect these objects at at least two consecutive front or back facing object points. In this work we present a method to efficiently detect these lines using depth-peeling and simple fragment operations. Of all polygons only those having an intersection with any of these lines are potentially colliding. Polygons not intersected by the same line do not intersect each other. We describe how to find all potentially colliding polygons and the potentially colliding pairs using a mipmap hierarchy that represents line bundles at ever increasing width. To download only potentially colliding polygons to the CPU for polygon-polygon intersection testing we have developed a general method to convert a sparse texture into a packed texture of reduced size. Our method exploits the intrinsic strength of GPUs to scan convert large sets of polygons and to shade billions of fragments at interactive rates. It neither requires a bounding volume hierarchy nor a pre-processing stage, so it can efficiently deal with very large and deforming polygonal models. The particular design makes the method suitable for applications where geometry is modified or even created on the GPU. © 2007 IADIS.

关键词： graphics processing unit

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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

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12th International Conference on Mobile and Ubiquitous Multimedia, MUM 2013

作者： Strothoff, Sven Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 48149 Münster Germany

ISBN: (纸本)9781450326483

As applications originating on desktop computers find their way onto multi-touch enabled mobile devices many inter- action tasks that were designed for computer mice spread to new touch-based environments. One example is region selection, for instance in image editing applications. Several studies already investigated multi-touch object selections however, region selections have not been closely examined. Our proposed selection technique was designed for multi- touch interaction and better suits mobile devices. Taking advantage of multiple touches enables the user to easily extend, modify and refine selections based on the order and relative position|the context|of touches. We were concerned that controlling more degrees of freedom with our technique could negatively impact simple selections. To evaluate its performance we present a user study that compares it to currently used techniques. Results show that our multi-touch region selection represents a good compromise of speed and precision, while providing the possibility to easily refine the selected region. © 2013 ACM.

关键词： Personal computers

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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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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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A versatile hierarchical mesh for subdivision surfaces

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IEEE Potentials 2008年第5期27卷 20-25页

作者： Fünfzig, Christoph Müller, Kerstin Janetzek, Rafael Techmann, Torsten PRISM Lab. Arizona State University United States PRISM Lab. Arizona State University Computer Graphics and Visualization University of Kaiserslautern Germany Darmstadt University of Technology Germany

The construction and processing of surface geometry can be done by connecting surface primitives to vertices, edges, and neighbors. The representation schemes of surface geometry are vertex-based, edge-based, and quad-edge-based. Catmull and Clark rule of subdivision includes three different rules to create new vertices in the refined control mesh, that are vertex, edge, and face subdivision rule. A new vertex can be created in the refined mesh as a convex combination of the vertices in the neighborhood of vertex, edge, and face in the control mesh. The first subdivision step has a quadrangle control mesh and number of vertices with valence unequal to four constant during refinement. The Charles Loop subdivision scheme is based on box spline and during a subdivision a triangle is divided into four triangles through vertex and edge subdivision rule.

关键词： Mesh generation

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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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Modeling human performance of stroke-based text entry 15

Modeling human performance of stroke-based text entry

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17th International Conference on Human-computer Interaction with Mobile Devices and Services, MobileHCI 2015

作者： Burgbacher, Ulrich Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 Münster48149 Germany

ISBN: (纸本)9781450336529

Gesture typing is a popular stroke-based text input method for mobile devices. Instead of tapping, the user enters a word with a single continuous stroke by gesturing through all the letters. In this paper, we introduce a quantitative motor control model to predict the human performance of gesture typing in terms of production times. Based on a model of cursive handwriting, it can be applied to predict the influence of the keyboard layout on gesture typing performance. In contrast to previous approaches, the "chunking" of multiple movements into a single action, which is observed for expert users, is a natural characteristic of the proposed model that avoids overestimation of the production times. Data collected from gesture keyboard users is evaluated to assess the performance of the model in comparison to previous models. © 2015 ACM.

关键词： Character recognition

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

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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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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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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

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2013 8th ACM International Conference on Interactive Tabletops and Surfaces, ITS 2013

作者： Strothoff, Sven Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 48149 Münster Germany

ISBN: (纸本)9781450322713

As applications that originated on desktop computers find their way onto new multi-touch enabled devices many interaction tasks that were designed for keyboards and computer mice spread to new touch-based environments. One example is the selection of regions, for instance in image editing applications. While there are already several studies involving multi-touch object selections, region selections have not been closely examined. Instead of using traditional mouse-based interaction schemes we propose a multi-touch selection technique that better suits touch-based devices. Based on this technique we propose a novel way to take advantage of multiple touches to easily extend, modify and refine selections based on the order and relative position - the context - of touches. © 2013 Authors.

关键词： Personal computers

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