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Collaborative Factory Planning in Virtual Reality

Procedia CIRP 2012年 3卷 317-322页

作者： N. Menck X. Yang C. Weidig P. Winkes C. Lauer H. Hagen B. Hamann J.C. Aurich Institute for Manufacturing Technology and Production Systems (FBK) 67653 Kaiserslautern Germany Computer Graphics and HCI Group 67653 Kaiserslautern Germany Institute for Data Analysis and Visualization (IDAV) Davis 95616-8562 USA

The competitive development and optimization of manufacturing systems challenge the collaboration and innovation of enterprises. Different information, thinking, and points of view have to be exchanged across engineering, decision-making, and executive levels safely and effectively. The Virtual Reality (VR) technologies provide the users advanced Human-computer-Interfaces for designing, analyzing, and optimizing complex manufacturing systems. The objective of this paper is to describe a VR-based approach that allows the simultaneous visualization, investigation, and analysis for factory planning. This gives global entities a competitive advantage when conducting business.

关键词： Distance Collaboration Factory Planning Virtual Reality

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Anisotropic range image integration

Anisotropic range image integration

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Joint 34th Symposium of the German Association for Pattern Recognition, DAGM 2012 and 36th Symposium of the Austrian Association for Pattern Recognition, OAGM 2012

作者： Schroers, Christopher Zimmer, Henning Valgaerts, Levi Bruhn, Andrés Demetz, Oliver Weickert, Joachim Mathematical Image Analysis Group Faculty of Mathematics and Computer Science Saarland University Saarbrücken 66041 Germany Computer Graphics Laboratory Department of Computer Science ETH Zurich Zurich 8092 Switzerland Max-Planck-Institut für Informatik Campus E1.4 Saarbrücken 66123 Germany Institute for Visualization and Interactive Systems University of Stuttgart Universitätsstraße 38 70569 Stuttgart Germany

ISBN: (纸本)9783642327162

Obtaining high-quality 3D models of real world objects is an important task in computer vision. A very promising approach to achieve this is given by variational range image integration methods: They are able to deal with a substantial amount of noise and outliers, while regularising and thus creating smooth surfaces at the same time. Our paper extends the state-of-the-art approach of Zach et al.(2007) in several ways: (i) We replace the isotropic space-variant smoothing behaviour by an anisotropic (direction-dependent) one. Due to the directional adaptation, a better control of the smoothing with respect to the local structure of the signed distance field can be achieved. (ii) In order to keep data and smoothness term in balance, a normalisation factor is introduced. As a result, oversmoothing of locations that are seen seldom is prevented. This allows high quality reconstructions in uncontrolled capture setups, where the camera positions are unevenly distributed around an object. (iii) Finally, we use the more accurate closest signed distances instead of directional signed distances when converting range images into 3D signed distance fields. Experiments demonstrate that each of our three contributions leads to clearly visible improvements in the reconstruction quality. © 2012 Springer-Verlag.

关键词： computer vision

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Temporal focus+context for clusters in particle data

Temporal focus+context for clusters in particle data

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2017 Conference on Vision, Modeling and visualization, VMV 2017

作者： Staib, J. Grottel, S. Gumhold, S. Computer Graphics and Visualization TU Dresden Germany

ISBN: (纸本)9783038680499

Time-dependent particle-based simulations are typically carried out by direct calculation of interactions between particles over time. The investigation of higher order effects of particle clusters helps understanding the system's dynamic. Existing methods for particle data analysis either rely on animation, where only one time step is visible, or abstraction, which is giving up on visualizing the data in its spatial domain. Inspired from illustrative techniques, we present an interactive focus+context visualization, based on flow ribbons, that combines both approaches. Our method jointly shows one time step in detail, as well as an abstract contextual visualization of past and future dynamics in one image. It allows to assess the time evolution of various cluster attributes around the current temporal focus. We show the usefulness of the approach on two exemplary case studies. © 2017 The Author(s).

关键词： visualization

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Progressive parallel coordinates

Progressive parallel coordinates

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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： René Rosenbaum Jian Zhi Bernd Hamann Visual Computing and Computer Graphics group (VCG) Institute for Computer Science University of Rostock Rostock Germany Institute for Data Analysis and Visualization (IDAV) Department of Computer Science University of California Davis CA USA Department of Industrial Engineering and Operations Research Columbia University NY USA

Progressive refinement is a methodology that makes it possible to elegantly integrate scalable data compression, access, and presentation into one approach. Specifically, this paper concerns the effective use of progressive parallel coordinates (PPCs), utilized routinely for high-dimensional data visualization. It discusses how the power of the typical stages of progressive data visualization can also be utilized fully for PPCs. Further, different implementations of the underlying methods and potential application domains are described. The paper also presents empirical results concerning the benefits of PPC with regard to efficient data management and improved presentation, indicating that the proposed approach is able to close the gap between data handling and visualization.

关键词： Lead visualization Logic gates

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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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Triangle cursor: Interactions with objects above the tabletop

Triangle cursor: Interactions with objects above the tableto...

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ACM International Conference on Interactive Tabletops and Surfaces, ITS 2011

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

ISBN: (纸本)9781450308717

Extending the tabletop display to the third dimension using a stereoscopic projection offers the possibility to improve applications by using the volume above the table surface. The combination of multi-touch input and stereoscopic projection usually requires an indirect technique to interact with objects above the tabletop, as touches can only be detected on the surface. Triangle Cursor is a 3D interaction technique that allows specification of a 3D position and yaw rotation above the interactive tabletop. It was designed to avoid occlusions that disturb the stereoscopic perception. While Triangle Cursor uses an indirect approach, the position, the height above the surface and the yaw rotation can be controlled simultaneously, resulting in a 4 DOF manipulation technique. We have evaluated Triangle Cursor in an initial user study and compared it to a related existing technique in a formal user study. Our experiments show that users were able to perform all tasks significantly faster with our technique without loosing any precision. Most of the subjects considered the technique easy to use and satisfying. © 2011 ACM.

关键词： Stereo image processing

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2D touching of 3D stereoscopic objects 11

2D touching of 3D stereoscopic objects

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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

作者： Valkov, Dimitar Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450302289

Recent developments in the area of touch and display technologies have suggested to combine multi-touch systems and stereoscopic visualization. Stereoscopic perception requires each eye to see a slightly different perspective of the same scene, which results in two distinct projections on the display. Thus, if the user wants to select a 3D stereoscopic object in such a setup, the question arises where she would touch the 2D surface to indicate the selection. A user may apply different strategies, for instance touching the midpoint between the two projections, or touching one of them. In this paper we analyze the relation between the 3D positions of stereoscopically rendered objects and the on-surface touch points, where users touch the surface. We performed an experiment in which we determined the positions of the users' touches for objects, which were displayed with positive, negative or zero parallaxes. We found that users tend to touch between the projections for the two eyes with an offset towards the projection for the dominant eye. Our results give implications for the development of future touch-enabled interfaces, which support 3D stereoscopic visualization. Copyright 2011 ACM.

关键词： Touch screens

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A view-dependent and inter-frame coherent visualization of integral lines using screen contribution

A view-dependent and inter-frame coherent visualization of i...

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16th International Workshop on Vision, Modeling and visualization, VMV 2011

作者： Günther, Tobias Bürger, Kai Westermann, Rüdiger Theisel, Holger Visual Computing Group University of Magdeburg Germany Computer Graphics and Visualization Group Technische Universität München Germany

ISBN: (纸本)9783905673852

In vector field visualization, integral lines like stream, path, or streak lines are often used to examine the behavior of steady and unsteady flows. In 3D, however, visualizing integral lines is problematic since the resulting geometric structures cause occlusions, often hiding relevant features in the data. For this reason one important goal is to find a minimum number of lines which can represent all relevant features in the vector field. In this paper we propose a novel approach that reduces the number of displayed lines, and occlusions thereof, by smoothly fading out lines based on their contribution to the viewport. In order to reduce visual clutter that is introduced by rendering multiple line contribution into one pixel, the blending equation is slightly modified. In addition, an interactive brushing is applied to further support exploration. Our approach attains a view-dependent visualization of integral lines that is inter-frame coherent and achieves real-time frame rates. To demonstrate the effectiveness and efficiency of our approach, we pursued a number of tests using real-world steady and unsteady vector fields. © The Eurographics Association 2011.

关键词： Blending

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Flexible clipmaps for managing growing textures

Flexible clipmaps for managing growing textures

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作者： Feldmann, Dirk Steinicke, Frank Hinrichs, Klaus H. Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9789898425454

Previous work on large image data sets has evolved techniques for handling representations of these data that cache textures of arbitrary, but fixed, size in a limited amount of physical memory for rendering in real-time. In these approaches the texture data is usually pre-processed and arranged, for instance in a geometry-independent texture clipmap. New technologies in the area of remote sensing generate aerial images in real-time at a high rate in a patchwork-like pattern, and new images may replace previously captured image data. These patchwork-like image data can be used to create a growing texture which is dynamic in the sense that it may be updated in parts and grow in extension in the course of time. For such growing textures, current clipmap techniques are not appropriate. In this paper we introduce the Flexible Clipmap, a technique for incrementally generating a clipmap from a large virtual texture of dynamically changing content and extent. Our technique makes use of a tile-based clipmap approach and a common spatial indexing data structure to provide access to very large growing textures. We present an evaluation of our technique in the context of a remote sensing application which demands real-time rendering of growing texture data.

关键词： Rendering (computer graphics)

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Context-aware volume navigation

Context-aware volume navigation

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Pacific (formerly Asia-Pacific APVIS) visualization Symposium

作者： Stefan Diepenbrock Timo Ropinski Klaus Hinrichs Visualization and Computer Graphics Research Group Germany

The trackball metaphor is exploited in many applications where volumetric data needs to be explored. Although it provides an intuitive way to inspect the overall structure of objects of interest, an in-detail inspection can be tedious - or when cavities occur even impossible. Therefore we propose a context-aware navigation technique for the exploration of volumetric data. While navigation techniques for polygonal data require information about the rendered geometry, this strategy is not sufficient in the area of volume rendering. Since rendering parameters, e.g., the transfer function, have a strong influence on the visualized structures, they also affect the features to be explored. To compensate for this effect we propose a novel image-based navigation approach for volumetric data. While being intuitive to use, the proposed technique allows the user to perform complex navigation tasks, in particular to get an overview as well as to perform an in-detail inspection without any navigation mode switches. The technique can be easily integrated into raycasting based volume renderers, needs no extra data structures and is independent of the data set as well as the rendering parameters. We will discuss the underlying concepts, explain how to enable the navigation at interactive frame rates using OpenCL, and evaluate its usability as well as its performance.

关键词： Navigation Cameras Rendering (computer graphics) Data visualization Mice Inspection Geometry

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