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检索条件"机构=Computer Graphics and Visualization"

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Augmentation techniques for efficient exploration in head-mounted display environments 10

Augmentation techniques for efficient exploration in head-mo...

引用

Proceedings of the 17th ACM Symposium on Virtual Reality Software and Technology

作者： Bolte, Benjamin Bruder, Gerd Steinicke, Frank Hinrichs, Klaus Lappe, Markus Visualization and Computer Graphics Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

ISBN: (纸本)9781450304412

Physical characteristics and constraints of today's head-mounted displays (HMDs) often impair interaction in immersive virtual environments (VEs). For instance, due to the limited field of view (FOV) subtended by the display units in front of the user's eyes more effort is required to explore a VE by head rotations than for exploration in the real world. In this paper we propose a combination of two augmentation techniques that have the potential to make exploration of VEs more efficient: (1) augmenting the geometric FOV (GFOV) used for rendering the VE, and (2) amplifying head rotations while the user changes her head orientation. In order to identify how much manipulation can be applied without users noticing, we conducted two psychophysical experiments in which we analyzed subjects' ability to discriminate between virtual and real head pitch and roll rotations while three different geometric FOVs were used. Our results show that the combination of both techniques has great potential to support efficient exploration of VEs. We found that virtual pitch and roll rotations can be amplified by 30% and 44% respectively, when the GFOV matches the subject's estimation of the most natural FOV. This leads to a possible reduction of the user's effort required to explore the VE using a combination of both techniques by approximately 25%. Copyright © 2010 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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Triangle cursor: Interactions with objects above the tabletop

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

引用

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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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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On triangulations

引用

International Conference on Computational Science and its Applications, ICCSA 2004

作者： Kolingerová, Ivana Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Plze Czech Republic

ISBN: (纸本)3540220569

Triangulations in 2D and 3D are a necessary part of many applications. This paper brings a brief survey of main triangulations used in computer graphics and computational geometry, then focuses on Delaunay and greedy triangulations in 2D and 3D and presents their most important properties and algorithms. Then three applications from computer graphics and image processing areas are presented and results discussed. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Triangulation

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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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DigiTap: An eyes-free VR/AR symbolic input device 14

DigiTap: An eyes-free VR/AR symbolic input device

引用

20th ACM Symposium on Virtual Reality Software and Technology, VRST 2014

作者： Prätorius, Manuel Valkov, Dimitar Burgbacher, Ulrich Hinrichs, Klaus Visualization and Computer Graphics Research Group University of Münster Einsteinstraße 62 Münster48143 Germany

ISBN: (纸本)9781450332538

In this paper we present DigiTap-a wrist-worn device specially designed for symbolic input in virtual and augmented reality (VR/AR) environments. DigiTap is able to robustly sense thumb-to-finger taps on the four fingertips and the eight minor knuckles. These taps are detected by an accelerometer, which triggers capturing of an image sequence with a small wrist-mounted camera. The tap position is then extracted with low computational effort from the images by an image processing pipeline. Thus, the device is very energy efficient and may potentially be integrated in a smartwatch-like device, allowing an unobtrusive, always available, eyes-free input. To demonstrate the feasibility of our approach an initial user study with our prototype device was conducted. In this study the suitability of the twelve tapping locations was evaluated, and the most prominent sources of error were identified. Our prototype system was able to correctly classify 92% of the input locations. Copyright © 2014 by the Association for Computing Machinery, Inc (ACM).

关键词： Cameras

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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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Interactive comparative visualization of multimodal brain tumor segmentation data 18

Interactive comparative visualization of multimodal brain tu...

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18th International Workshop on Vision, Modeling and visualization, VMV 2013

作者： Lindemann, F. Laukamp, K. Jacobs, A.H. Hinrichs, K. Visualization and Computer Graphics Research Group University of Münster Germany European Institute for Molecular Imaging Münster Germany

We present a visualization system for the analysis of multi-modal segmentation data of brain tumors. Our system is designed to allow researchers and doctors a further investigation of segmented tumor data beyond a quantitative assessment of size. This includes the efficient visual analysis of the shape and relative position of the different, often overlapping segmented data modalities, using high quality 3D renderings of the data. Furthermore, our system provides visualization methods to compare tumor segmentation volumes acquired at various points of time, which helps the user to explore changes in shape and size before and after treatment. We also employ two novel interactive diagrams which allow the user to quickly navigate and analyze overlapping tumor regions. All methods are assembled and linked in a multi-view framework. © The Eurographics Association 2013.

关键词： Tumors

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Bridging knowledge gaps in policy analysis with information visualization

Bridging knowledge gaps in policy analysis with information ...

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Joint 12th International Conference on Electronic Government, IFIP EGOV 2013 and 5th Electronic Participation, IFIP ePart 2013

作者： Ruppert, Tobias Bernard, Jurgen Kohlhammer, Jorn Dep. Information Visualization and Visual Analytics Fraunhofer Institute for Computer Graphics Research Fraunhoferstrasse 5 Darmstadt64283 Germany

ISBN: (纸本)9783885796152

Today's politicians are confronted with new (digital) ways to tackle complex decision-making problems. In order to make the right decisions profound analysis of the problems and possible solutions has to be performed. Therefore policy analysts need to collaborate with external experts consulted as advisors. Due to different expertises of these stakeholders the whole process may suffer from knowledge gaps. In our approach, we describe a concept to bridge these knowledge gaps by introducing information visualization and visual analytics to the policy analysis domain. Therefore, we refine a standard policy cycle at the stages relevant for the policy analysis. Secondly, we characterize the main stakeholders in the process, and identify knowledge gaps between these roles. Finally, we emphasize the merits of including advanced visualization techniques into the policy analysis process, and describe visualization as a facet bridging the knowledge gaps in a collaborative policy making life-cycle. © Gesellschaft fur Informatik, Bonn 2013.

关键词： Visual analytics

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On-line boosting for car detection from aerial images

On-line boosting for car detection from aerial images

引用

2007 IEEE International Conference on Research, Innovation and Vision for the Future, RIVF 2007

作者： Nguyen, Thuy Thi Grabner, Helmut Bischof, Horst Gruber, Barbara Institute for Computer Graphics and Vision Graz University of Technology Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

ISBN: (纸本)1424406943

In this paper, we present a new approach for automatic car detection from aerial images. The system exploits a robust machine learning method known as boosting for efficient car detection from high resolution aerial images. We propose to use on-line boosting with interactive training framework to efficiently train and improve the detector. We use integral images for fast computation of features. This also allows to perform exhaustive search for detection of cars after training. For post processing, we employ a mean shift clustering method, which improves the detection rate significantly. In contrast to related work, our framework does not rely on any priori knowledge of the image like a site-model or contextual information, but if necessary this information can be incorporated. An extensive set of experiments on high resolution aerial images using the new UltraCamD shows the superiority of our approach. © 2007 IEEE.

关键词： Tracking (position)

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