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Interactive generation of virtual environments using MUAVs

Interactive generation of virtual environments using MUAVs

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IEEE International Symposium on VR Innovation

作者： Strothoff, Sven Feldmann, Dirk Steinicke, Frank Vierjahn, Tom Mostafawy, Sina Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Germany Rmh New Media GmbH Gilbachstr. 29a 50672 Cologne Germany

ISBN: (纸本)9781457700538

In this paper we introduce a novel approach to interactively generate a virtual environment (VE) as reconstruction of the real world by using a swarm of autonomously flying miniature unmanned aerial vehicles (MUAVs). In our system each of the MUAVs is equipped with advanced network as well as different sensor technologies, which allow to capture images from low altitudes and to transfer those to a ground station, where the captured environment is reconstructed. At the ground station, the virtual 3D reconstruction is displayed in different virtual reality (VR) environments in which operators can not only explore the VE, but also interactively control the 3D reconstruction process. Therefore, virtual representations of the real MUAVs are visually integrated in the VE according to their real world position and orientation. The operator can manually steer these virtual MUAVs leading to corresponding movements of their real world counterparts. In this paper we introduce the AVIGLE project. In particular, we describe the 3D reconstruction process as well as the rendering of the large amount of data collected by the MUAVs. Furthermore, we outline the VR setup, and explain in detail how operators can interact with the virtual 3D reconstruction and the visual representation of the MUAVs. © 2011 IEEE.

关键词： Virtual reality

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Adaptive camera-based color mapping for mixed-reality applications

Adaptive camera-based color mapping for mixed-reality applic...

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International Symposium on Mixed and Augmented Reality (ISMAR)

作者： Martin Knecht Christoph Traxler Werner Purgathofer Michael Wimmer Institute of Computer Graphics and Algorithms University of Technology Vienna Austria VRVis Research Center for Virtual Reality and Visualization Austria

We present a novel adaptive color mapping method for virtual objects in mixed-reality environments. In several mixed-reality applications, added virtual objects should be visually indistinguishable from real objects. Recent mixed-reality methods use global-illumination algorithms to approach this goal. However, simulating the light distribution is not enough for visually plausible images. Since the observing camera has its very own transfer function from real-world radiance values to RGB colors, virtual objects look artificial just because their rendered colors do not match with those of the camera. Our approach combines an on-line camera characterization method with a heuristic to map colors of virtual objects to colors as they would be seen by the observing camera. Previous tone-mapping functions were not designed for use in mixed-reality systems and thus did not take the camera-specific behavior into account. In contrast, our method takes the camera into account and thus can also handle changes of its parameters during runtime. The results show that virtual objects look visually more plausible than by just applying tone-mapping operators.

关键词： Image color analysis Cameras Virtual reality Color Lighting Rendering (computer graphics) visualization

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Self-motion illusions in immersive virtual reality environments

Self-motion illusions in immersive virtual reality environme...

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IEEE Annual International Symposium Virtual Reality

作者： Gerd Bruder Frank Steinicke Phil Wieland Visualization and Computer Graphics Research Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany

Motion perception in immersive virtual reality environments significantly differs from the real world. For example, previous work has shown that users tend to underestimate travel distances in immersive virtual environments (VEs). As a solution to this problem, some researchers propose to scale the mapped virtual camera motion relative to the tracked real-world movement of a user until real and virtual motion appear to match, i. e., real-world movements could be mapped with a larger gain to the VE in order to compensate for the underestimation. Although this approach usually results in more accurate self-motion judgments by users, introducing discrepancies between real and virtual motion can become a problem, in particular, due to misalignments of both worlds and distorted space cognition. In this paper we describe a different approach that introduces apparent self-motion illusions by manipulating optic flow fields during movements in VEs. These manipulations can affect self-motion perception in VEs, but omit a quantitative discrepancy between real and virtual motions. We introduce four illusions and show in experiments that optic flow manipulation can significantly affect users' self-motion judgments. Furthermore, we show that with such manipulation of optic flow fields the underestimation of travel distances can be compensated.

关键词： visualization Optical sensors Cameras Integrated optics Blindness Optical distortion Detectors

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Optimized GPU histograms for multi-modal registration

Optimized GPU histograms for multi-modal registration

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IEEE International Symposium on Biomedical Imaging

作者： Christoph Vetter Rüdiger Westermann Siemens AG Corporate Research and Development Princeton USA Computer Graphics and Visualization Technische Universität München Germany

ISBN: (纸本)9781424441273

GPU-based systems are used more and more for medical image processing because of their parallel processing power and memory bandwidth. Impressive results have been achieved when registering large volume, however, one of the most-used similarity measures for multi-modal registration - mutual information - is not well suited for the streaming architecture because of its memory access pattern. We present two optimization approaches that improve the performance by a factor of four compared to state-of-the-art GPU algorithms in the latest research papers.

关键词： Biomedical imaging Histograms Streaming media

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System for inspection of large high-resolution radiography datasets

System for inspection of large high-resolution radiography d...

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IEEE Conference on Aerospace

作者： Tom Wypych So Yamaoka Kevin Ponto Falko Kuester San Diego Department of Computer Science and Engineering CalIT2 Center of Graphics Visualization and Virtual Reality (GRAVITY) University of California USA

High-resolution image collections pose unique challenges to analysts tasked with managing the associated data assets and deriving new information from them. While significant progress has been made towards rapid automated filtering, alignment, segmentation, characterization, and feature identification from image collections, the extraction of new insights still strongly depends on human intervention. In real-time capture and immediate-mode analysis environments where image data has to be continuously and interactively processed, a broad set of challenges in the image-driven verification and analysis cycle have to be addressed. A framework for interactive and intuitive inspection of large, high-resolution image data sets is presented, leveraging the strength of the human visual system for large-scale image processing. A case study is provided for an X-ray radiography system, covering the scanner-to-screen data management and representation pipeline, resulting in a visual analytics environment enabling analytical reasoning by means of interactive and intuitive visualization.

关键词： Imaging Inspection Data visualization X-ray imaging Visual analytics Pixel Radar imaging

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Next-generation 3D visualization for visual surveillance

Next-generation 3D visualization for visual surveillance

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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Peter M. Roth Volker Settgast Peter Widhalm Marcel Lancelle Josef Birchbauer Norbert Brändle Sven Havemann Horst Bischof Graz University of Technology Institute for Computer Graphics and Vision Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austrian Institute of Technology Dynamic Transportation Systems Siemens AG Österreich Corporate Technology (CT T CEE) Austria

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.

关键词： Cameras Three dimensional displays visualization Surveillance Solid modeling Trajectory

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Special interest group touching the 3rd dimension (T3D)

Special interest group touching the 3rd dimension (T3D)

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作者： Steinicke, Frank Benko, Hrvoje Daiber, Florian Keefe, Daniel De La Rivière, Jean-Baptiste Visualization and Computer Graphics Research Group Einsteinstr. 62 48149 Münster Germany Adaptive Systems and Interaction Microsoft Research One Microsoft Way Redmond WA 98052-6399 United States Intelligent User Interfaces DFKI GmbH Stuhlsatzenhausweg 3 66123 Saarbrücken Germany University of Minnesota USA 200 Union Street SE Minneapolis MN 55455 United States IMMERSION SAS 12 Rue Feaugas 33100 Bordeaux France

ISBN: (纸本)9781450302289

In recent years interactive visualization of 3D data has become important and widespread due to the requirements of several application areas. However, current user interfaces often lack adequate support for 3D interactions: 2D desktop systems are often limited in cases where natural interaction with 3D content is required, and 3D user interfaces consisting of stereoscopic projections and tracked input devices are rarely adopted by ordinary users. Touch interaction has received considerable attention for 2D interfaces, and more recently for 3D interfaces. Many touch devices now support multiple degrees of freedom input by capturing multiple 2D contact positions on the surface as well as varying levels of pressure and even depth. There is great potential for multi-touch interfaces to provide the traditionally difficult to achieve combination of natural 3D interaction without any instrumentation. When combined with a stereoscopic display as well as depth cameras, we believe that multi-touch technology can form the basis for a next generation of 3D user interfaces. Several research groups have begun to explore the potential, limitations, and challenges of this and other 3D touch environments, and first commercial systems are already available. The goal of the SIG "Touching the 3rd Dimension (T3D)" is to address the research and industrial challenges involved in exploring the space where the flat digital world of surface computing meets the physical, spatially complex, 3D space in which we live. The meeting will provide a common forum to attract groups of conference attendees who share their visions of the future and recent results in the area of improving 3D interaction and visualization by taking advantage of the strengths of advanced multi-touch computing.

关键词： User interfaces

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Estimation of virtual interpupillary distances for immersive head-mounted displays 10

Estimation of virtual interpupillary distances for immersive...

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7th Annual Symposium on Applied Perception in graphics and visualization, APGV 2010

作者： Bruder, Gerd Steinickey, Frank Hinrichsz, Klaus Visualization and Computer Graphics Research Group University of Münster Germany

ISBN: (纸本)9781450302487

Head-mounted displays (HMDs) allow users to observe virtual environments (VEs) from an egocentric perspective. In order to present a realistic stereoscopic view, the rendering system has to be adjusted to the characteristics of the HMD, e. g., the display's field of view (FOV), as well as to characteristics that are unique for each user, in particular her interpupillary distance (IPD). Typically, the user's IPD is measured, and then applied to the virtual IPD used for rendering, assuming that the HMD's display units are correctly adjusted in front of the user's eyes. A discrepancy between the user's IPD and the virtual IPD may distort the perception of the VE. In this poster we analyze the user's perception of a VE in a HMD environment, which is displayed stereoscopically with different IPDs. We conducted an experiment to identify virtual IPDs that are identified as natural by subjects for different FOVs. In our experiment, subjects had to adjust the IPD for a rendered virtual replica of our real laboratory until perception of the virtual replica matched perception of the real laboratory. We found that the virtual IPDs subjects estimate as most natural are often not identical to their IPDs, and that the estimations were affected by the FOV of the HMD and the virtual FOV used for rendering.

关键词： Virtual reality

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Perception of perspective distortions of man-made virtual objects 10

Perception of perspective distortions of man-made virtual ob...

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ACM SIGGRAPH 2010 Posters, SIGGRAPH '10

作者： Steinicke, Frank Bruder, Gerd Kuhl, Scott Visualization and Computer Graphics University of Munster Germany Department of Computer Science Michigan Technological University United States

ISBN: (纸本)9781450303934

In computer graphics one is often concerned with representing 3D objects on 2D displays, which provide often only a limited display field of view (DFOV) to the observer. Usually, planar geometric projections, in particular linear perspective projections, are applied, which make use of a straightforward mapping of graphical entities in a 3D view frustum to a 2D image plane. Corresponding to the DFOV introduced for computer screens, the aperture angle of the virtual camera is often denoted as geometric field of view (GFOV) [Kjelldahl and Prime 1995]. Projections of virtual objects on a computer screen are affected by the interplay between the GFOV that is used to render the scene, and the DFOV (see Figure 1). In this context, only little research has been conducted to identify perspective projections that appear realistic to users. Instead, graphics designers and developers often choose GFOVs that vary significantly from the DFOV [Steinicke et al. 2009]. © ACM 2010.

关键词： Interactive computer graphics

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A repository for 3D model production and interpretation in culture and beyond 11

A repository for 3D model production and interpretation in c...

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

作者： Doerr, M. Tzompanaki, K. Theodoridou, M. Georgis, Ch. Axaridou, A. Havemann, S. Institute of Computer Science FORTH Crete Greece Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Austria

ISBN: (纸本)9783905674293

In order to support the work of researchers in the production, processing and interpretation of complex digital objects and the dissemination of valuable and diverse information to a broad spectrum of audience there is need for an integrated high performance environment that will combine knowledge base features with content management and information retrieval (IR) technologies. In this paper we describe the design and implementation of an integrated repository to ingest, store, manipulate, and export 3D Models, their related digital objects and metadata and to enable efficient access, use, reuse and preservation of the information, ensuring referential and semantic integrity. The repository design is based on an integrated coherent conceptual schema that models complex metadata regarding provenance information, structured models, formats, compatibility of 3D models, historical events and real world objects. This repository is not implemented just to be a storage location for digital objects;it is meant to be a working integrated platform for distant users who participate in a process chain consisting of several steps. A first prototype, in the field of Cultural Heritage, has already been implemented in the context of 3D-COFORM project, an integrated research project funded by the European Community's Seventh Framework Programme (FP7/2007-2013, no 231809) and the results are satisfactory, proving the feasibility of the design decisions which are absolutely new, ambitious, and extraordinarily generic for e-science. © The Eurographics Association 2010.

关键词： Metadata

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