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检索条件"机构=Inst. of Comp. Graphics/Algorithms"

共 55 条记录，以下是11-20 订阅

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Christmas tree case study: comp.ted tomography as a tool for mastering comp.ex real world objects with applications in comp.ter graphics

Christmas tree case study: Computed tomography as a tool for...

引用

VIS 2002, IEEE Visualisation 2002

作者： Kanitsar, Armin Theurßl, Thomas Mroz, Lukas Šrámek, Miloš Bartrolí, Anna Vilanova Csébfalvi, Balázs Hladůvka, Jiří Fleischmann, Dominik Knapp, Michael Wegenkittl, Rainer Felkel, Petr Röttger, Stefan Guthe, Stefan Purgathofer, Werner Gröller, Meister Eduard Austrian Academy of Sciences Vienna Austria VRVis Research Center Vienna Austria Department of Radiology University of Vienna Vienna Austria VIS University of Stuttgart Stuttgart Germany Inst. of Comp. Graphics/Algorithms Vienna University of Technology Vienna Austria WSI GRIS University of Tübingen Tubingen Germany

We report on using comp.ted tomography (CT) as a model acquisition tool for comp.ex objects in comp.ter graphics. Unlike other modeling and scanning techniques the comp.exity of the object is irrelevant in CT, which naturally enables to model objects with, for example, concavities, holes, twists or fine surface details. Once the data is scanned, one can apply post-processing techniques for data enhancement, modification or presentation. For demonstration purposes we chose to scan a Christmas tree which exhibits high comp.exity which is difficult or even impossible to handle with other techniques. However, care has to be taken to achieve good scanning results with CT. Further, we illustrate post-processing by means of data segmentation and photorealistic as well as non-photorealistic surface and volume rendering techniques.

关键词： comp.ter graphics

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Importance-driven volume rendering

Importance-driven volume rendering

引用

IEEE Visualization 2004 - Proceedings, VIS 2004

作者： Viola, Ivan Kanitsar, Armin Gröller, Meister Eduard Inst. Comp. Graphics and Algorith. Vienna University of Technology Austria

ISBN: (纸本)0780387880

This paper introduces importance-driven volume rendering as a novel technique for automatic focus and context display of volumetric data. Our technique is a generalization of cut-away views, which - depending on the viewpoint - remove or suppress less important parts of a scene to reveal more important underlying information. We automatize and apply this idea to volumetric data. Each part of the volumetric data is assigned an object importance which encodes visibility priority. This property determines which structures should be readily discernible and which structures are less important. In those image regions, where an object occludes more important structures it is displayed more sparsely than in those areas where no occlusion occurs. Thus the objects of interest are clearly visible. For each object several representations, i.e., levels of sparseness, are specified. The display of an individual object may incorporate different levels of sparseness. The goal is to emphasize important structures and to maximize the information content in the final image. This paper also discusses several possible schemes for level of sparseness specification and different ways how object importance can be comp.sited to determine the final appearance of a particular object. ©2004 IEEE.

关键词： Medical imaging

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Models and visualizations in a virtual habitat 03

Models and visualizations in a virtual habitat

引用

Spring Conference on comp.ter graphics, SCCG 2003 - Conference Proceedings

作者： Leberl, Franz Graz University of Technology Inst. for Comp. Graphics and Vision Graz Austria

ISBN: (纸本)158113861X

The Earth is still rather "flat". Therefore geographic data still tend to be two-dimensional and are stored in 2-dimensional information systems. But we do live in a three-dimensional world. In technical systems, the 3rd dimension has long been merely an attribute of 2-dimensional graphical data. This is subject to rapid change. Three-dimensional models of the human habitat are emerging. The required tools to create and use such models are the topic of the paper. This is at the intersection of comp.ter graphics and comp.ter vision and reflects a recent trend in comp.ter science, where vision and graphics increasingly tend to meet. The paper discusses procedures for a fully automated creation of 3-dimensional models of today's buildings and cities, but also of interior spaces, even of microscopic worlds and of the lost cities of the antique. Methods will be described, but also their performance, accuracies, limitations and costs, to better understand what it takes to create and use a "virtual habitat".

关键词： Virtual reality

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A semantic approach for user depending information visualization

A semantic approach for user depending information visualiza...

引用

Proceedings - Eighth International Conference on Information Visualisation, IV 2004

作者： Burmeister, Dirk Grimm, Stephan Haist, Joerg Fraunhofer Inst. for Comp. Graphics Fraunhoferstr. 5 64283 Darmstadt

This paper intends to generalize given techniques in modeling semantic content according to the purpose of transferring them from industrial application scenarios to the requirements of design for all. User groups like deaf people assimilate information in a different manner than hearing ones. In [1] several requirements of deaf users of information visualization are described as a basis for barrier free technology. In this paper the author wants to engross his thesis according to a project he is working for. In the project WIDE [2] two user groups - designers and engineers in industrial product design and development - have different views on the search results according their needs and interests. WIDE is an EU-funded project (IST-2001-34417).

关键词： Information management

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DRR volume rendering using splatting in shear-warp context

DRR volume rendering using splatting in shear-warp context

引用

2000 IEEE Nuclear Science Symposium Conference Record

作者： Cai, Wenli Sakas, Georgios Fraunhofer Inst. for Comp. Graphics Rundeturmstrasse 6 D-64283 Darmstadt Germany

Digital Reconstruction Radiography (DRR) is an important technique in radiotherapy imaging applications. DRR volume rendering aims at rendering DRR images using CT or other tomographic data sets. In addition to the appropriate optical model, the interactive and realistic DRR imaging depends mainly on an accurate attenuation coefficient transfer function, which is usually a piecewise function, and an interactive rendering algorithm with reasonable rendering quality. In this paper, we first present a realistic DRR transfer function based on the mass attenuation coefficient comp.sition. Then, we introduce an object space DRR rendering algorithm, DRR splatting in the sheared object space. The DRR image qualities under different rendering algorithms are comp.red, including ray casting, Fourier volume rendering, projective shear-warp and splatting shear-warp. Finally, a line encoding technique is adopting to accelerate DRR rendering.

关键词： Radiography

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Tracking with Reference images: A Real-Time and Markerless Tracking Solution for Out-Door Augmented Reality Applications 01

Tracking with Reference images: A Real-Time and Markerless T...

引用

Proceedings VAST 2001 Virtual Reality, Archeology, and Cultural Heritage

作者： Stricker, Didier Fraunhofer Inst. for Comp. Graphics Rundeturmstraße 6 64283 Darmstadt Germany

ISBN: (纸本)1581134479

This paper presents the optical tracking solution developed in the ArcheoGuide project (The Augmented Reality based Cultural Heritage On-site GUIDE, IST-1999-11306). The system enables to recover precisely the user head position and orientation at predetermined viewing location without the support of markers. The tracking approach is novel and bases on the real-time registration of the live video-image with so called "reference images" of the site. Once the matching between a live- and a reference-images could have been established, the virtual information can be presented correctly to the user, either using a 2D image warping transformation or after deduction of the current 3D position/orientation of the camera. The image matching algorithm represents the core of the tracking system. It must have real-time performance and be particulary robust to intensity and local changes. We opted for an analysis in frequency space and exploit the invariance properties of the Mellin-Fouricr transform. The tracking system has been tested outdoor in the context of the Archeoguide project. It runs on a laptop at around 10 to 15 Hz and provides views of virtual monuments in a Head Mounted Display superposed to the ruins of the archaeological site.

关键词： Virtual reality

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CPR - Curved planar reformation

CPR - Curved planar reformation

引用

VIS 2002, IEEE Visualisation 2002

作者： Kanitsar, Armin Fleischmann, Dominik Wegenkittl, Rainer Felkel, Petr Gröller, Meiste Eduard Inst. of Comp. Graphics/Algorithms Vienna University of Technology Vienna Austria Department of Radiology University of Vienna Vienna Austria VRVis Research Center Vienna Austria

Visualization of tubular structures such as blood vessels is an important topic in medical imaging. One way to display tubular structures for diagnostic purposes is to generate longitudinal cross-sections in order to show their lumen, wall, and surrounding tissue in a curved plane. This process is called Curved Planar Reformation (CPR). We present three different methods to generate CPR images. A tube-phantom was scanned with comp.ted Tomography (CT) to illustrate the properties of the different CPR methods. Furthermore we introduce enhancements to these methods: thick-CPR, rotating-CPR and multi-path-CPR.

关键词： Medical imaging

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Goal oriented assistance for extended multimedia systems and dynamic technical infrastructures

Goal oriented assistance for extended multimedia systems and...

引用

Proceedings of the Seventh IASTED International Conference on Internet and Multimedia Systems and Applications

作者： Heider, Thomas Dept. Mobile Multimedia Technologies Fraunhofer Inst. for Comp. Graphics Rostock Germany

ISBN: (纸本)0889863806

Present-day technical infrastructures and appliances provide aplenty of opportunities for simplifying and supporting the everyday life. However, many of the systems available today - such as typical feature loaded multimedia or infotainment systems - are not always efficiently usable for the average person. This paper presents a planning-based approach to helping the user to control such comp.ex infrastructures. It describes the architectural concept, which makes it possible to integrate classical Artificial Intelligence technology - such as planning and scheduling - into the domain of networked consumer appliances, like multimedia systems and room control. Especially, we concentrate on the architectural concepts, which allows us to create systems that can be extended dynamically and that are not build by a single vendor.

关键词： Multimedia systems

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Eye blink based fatigue detection for prevention of comp.ter vision syndrome

Eye blink based fatigue detection for prevention of computer...

引用

11th IAPR Conference on Machine Vision Applications, MVA 2009

作者： Divjak, Matjaz Bischof, Horst Inst. for Comp. Graphics and Vision TU Graz Inffeldgasse 16a 8010 Graz Austria

ISBN: (纸本)9784901122092

Living in information society we spend a lot of time in front of visual display units such as comp.ter monitors or TV screens. This has positive as well as negative effects on our lives. Negative effects are mostly health related and one major concern is the increasing number of people affected by the comp.ter Vision Syndrome (CVS) [1], Most CVS-related problems can be avoided by suitable preventive actions, but the majority of comp.ter users ignore them. To help remedy the situation we present a prototype of a comp.ter vision system for real-time eye blink based detection of eye fatigue, which is a common symptom leading towards CVS. Our program records video of the user by a comp.ter monitor mounted web-camera, processes the frames and detects hazardous behaviour based on user s eye dynamics and blink patterns. Experimental results show that the proposed system is capable of detecting common cases of fatigued behaviour linked with long-term comp.ter use. We believe regular use of the proposed system could significantly reduce the CVS symptoms for long-time comp.ter workers. However, the techniques used can also be applied to other similar applications, such as driver fatigue detection, human-comp.ter interaction, etc.

关键词： comp.ter monitors

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Efficient volume measurement using voxelization 03

Efficient volume measurement using voxelization

引用

Spring Conference on comp.ter graphics, SCCG 2003 - Conference Proceedings

作者： Reitinger, Bernhard Bornik, Alexander Beichel, Reinhard Inst. for Comp. Graphics and Vision Graz University of Technology Inffeldgasse 16/2 8010 Graz Austria

ISBN: (纸本)158113861X

This paper presents an efficient volume measurement method for quantitative assessments within a virtual liver surgery planning system. The measurement is carried out by hardware-accelerated voxelization of surface-based models in order to be applicable for interactive applications. The focus of this paper is the presentation of our voxelization technique suitable for off-the-shelf PC graphics cards including two different data retrieval approaches. Moreover, the measurement can be performed off-screen while not disturbing the rest of the application. Another important issue discussed in this paper is the applicability study within the planning system. Our measurement toolkit has been applied on several medical objects and delivers interactive response times.

关键词： comp.ter graphics

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