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IEEE Conference on visualization

作者： T. Theussl T. Moller M.E. Groller Institute of Computer Graphics and Algorithms Vienna University of Technology Graphics Usability and Visualization Lab Simon Fraser University Canada Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)0780372018

The classification of volumetric data sets as well as their rendering algorithms are typically based on the representation of the underlying grid. Grid structures based on a Cartesian lattice are the de-facto standard for regular representations of volumetric data. In this paper we introduce a more general concept of regular grids for the representation of volumetric data. We demonstrate that a specific type of regular lattice-the so-called body-centered cubic-is able to represent the same data set as a Cartesian grid to the same accuracy but with 29.3% fewer samples. This speeds up traditional volume rendering algorithms by the same ratio, which we demonstrate by adopting a splatting implementation for these new lattices. We investigate different filtering methods required for computing the normals on this lattice. The lattice representation results also in lossless compression ratios that are better than previously reported. Although other regular grid structures achieve the same sample efficiency, the body-centered cubic is particularly easy to use. The only assumption necessary is that the underlying volume is isotropic and band-limited-an assumption that is valid for most practical data sets.

关键词： Sampling methods Lattices Signal sampling computer graphics Data visualization Signal processing algorithms Physics Energy states Image processing Image sampling

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Freeform Image

Freeform Image

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Pacific Conference on computer graphics and Applications

作者： Thomas Schiwietz Joachim Georgii Rudiger Westermann Siemens Corporate Research Imaging & Visualization Princeton USA Computer Graphics & Visualization Technische Universität München Munich Germany

ISBN: (纸本)9780769530093;0769530095

In this paper we present a technique for image deformation in which the user is given flexible control over what kind of deformation to perform. Freeform image extends available image deformation techniques in that it provides a palette of intuitive tools including interactive object segmentation, stiffness editing and force-based controls to achieve both a natural look and realistic animations of deforming parts. The model underlying our approach is physics-based and it is amenable to a variety of different kinds of image manipulations ranging from as-rigid- as-possible to fully elastic deformations. We have developed a multigrid solver for quadrangular finite elements, which achieves real-time performance for high resolution pixel grids. On recent CPUs this solver can handle about 16K co-rotated finite elements at roughly 60 ms.

关键词： computer graphics visualization Force control Finite element methods Shape control Interpolation Application software Object segmentation Animation Deformable models

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A scalable repository infrastructure for CH digital object management

A scalable repository infrastructure for CH digital object m...

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2012 18th International Conference on Virtual Systems and Multimedia: Virtual Systems in the Information Society, VSMM 2012

作者： Pan, X. Schiffer, T. Schröttner, M. Havemann, S. Hecher, M. Berndt, R. Fellner, D.W. Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Inffeldgasse 16c 8010 Graz Austria Fraunhofer Austria Research Visual Computing Inffeldgasse 16c 8010 Graz Austria

ISBN: (纸本)9781467325653

In recent decades, researchers of archaeological 3D digitalization found that the collection and archive of processing intermediate data are extremely tiresome tasks. They need large of man power and material resources, even though, mistakes can be raised and break the whole working chain. The traditional documentation of digitalization process is also a pending challenge, although, the ISO standard CIDOC-CRM (ISO 21127:2006) has been introduced to the archaeologists and museum professionals since years, but there are still some obvious gaps between practice and theory: (1) How to connect the discrete archaeologists, museums, CH research institutions, and the public? (2) How to ensure the integrity of whole digitalization process and simplify the process? (3) How to maximize the usability of the public digital objects in CH community? (4) How to long term preserve the huge amount of datasets? (5) How to present and disseminate the digital object to the public? This paper presents an operational and optimal infrastructure that realizes not only a distributed storage system, but also a content management system. This infrastructure works as a backbone of whole digitalization process, provides a complete solution suite for archaeologists, museum professionals, museum visitors, and IT technicians. © 2012 IEEE.

关键词： Digital storage

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A multi-touch enabled human-transporter metaphor for virtual 3D traveling

A multi-touch enabled human-transporter metaphor for virtual...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Dimitar Valkov Frank Steinicke Gerd Bruder Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

In this tech-note we demonstrate how multi-touch hand gestures in combination with foot gestures can be used to perform navigation tasks in interactive 3D environments. Geographic Information Systems (GIS) are well suited as a complex testbed for evaluation of user interfaces based on multi-modal input. Recent developments in the area of interactive surfaces enable the construction of low-cost multi-touch displays and relatively inexpensive sensor technology to detect foot gestures, which allows to explore these input modalities for virtual reality environments. In this tech-note, we describe an intuitive 3D user interface metaphor and corresponding hardware, which combine multi-touch hand and foot gestures for interaction with spatial data.

关键词： Navigation Foot Legged locomotion User interfaces Geographic Information Systems Virtual reality visualization computer graphics computer science System testing

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Comparative visualization for diffusion tensor imaging group study at multiple levels of detail

Comparative visualization for diffusion tensor imaging group...

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2017 Eurographics Workshop on Visual Computing for Biology and Medicine, VCBM 2017

作者： Zhang, C. Höllt, T. Caan, M.W.A. Eisemann, E. Vilanova, A. Computer Graphics and Visualization Delft University of Technology Delft Netherlands Computational Biology Center Leiden University Medical Center Leiden Netherlands Brain Imaging Center Academic Medical Center University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9783038680369

Diffusion Tensor Imaging (DTI) group studies often require the comparison of two groups of 3D diffusion tensor fields. The total number of datasets involved in the study and the multivariate nature of diffusion tensors together make this a challenging process. The traditional approach is to reduce the six-dimensional diffusion tensor to some scalar quantities, which can be analyzed with univariate statistical methods, and visualized with standard techniques such as slice views. However, this provides merely part of the whole story due to information reduction. If to take the full tensor information into account, only few methods are available, and they focus on the analysis of a single group, rather than the comparison of two groups. Simultaneously comparing two groups of diffusion tensor fields by simple juxtaposition or superposition is rather impractical. In this work, we extend previous work by Zhang et al. [ZCH∗17] to visually compare two groups of diffusion tensor fields. To deal with the wealth of information, the comparison is carried out at multiple levels of detail. In the 3D spatial domain, we propose a details-on-demand glyph representation to support the visual comparison of the tensor ensemble summary information in a progressive manner. The spatial view guides analysts to select voxels of interest. Then at the detail level, the respective original tensor ensembles are compared in terms of tensor intrinsic properties, with special care taken to reduce visual clutter. We demonstrate the usefulness of our visual analysis system by comparing a control group and an HIV positive patient group. © 2017 The Eurographics Association.

关键词： Tensors

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RDEPS: A combined Reaction-Diffusion Equation and Photometric Similarity filter for optical image restoration 12th

RDEPS: A combined Reaction-Diffusion Equation and Photometri...

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12th International Symposium on Visual Computing, ISVC 2016

作者： Zhao, Xueqing Mavridis, Pavlos Schreck, Tobias Kuijper, Arjan School of Computer Science Xi’an Polytechnic University Xi’an710048 China Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Graz8010 Austria Fraunhofer IGD Darmstadt64283 Germany Technische Universität Darmstadt Darmstadt64289 Germany

ISBN: (纸本)9783319508313

Restoration of optical images degraded by atmospheric turbulence and various types of noise is still an open problem. In this paper, we propose an optical image restoration method based on a Reaction- Diffusion Equation and Photometric Similarity (RDEPS). We exploit photometric similarity and geometric closeness of the optical image by combining a photometric similarity function and a appropriately defined reaction-diffusion equation. Our resulting RDEPS filter is used to restore images degraded by atmospheric turbulence and noise, including Gaussian noise and impulse noise. Extensive experimental results show that our method outperforms other recently developed methods in terms of PSNR and SSIM. Moreover, the computational efficiency analysis shows that our RDEPS provides efficient restoration of optical images. © Springer International Publishing AG 2016.

关键词： Image reconstruction

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From game events to team tactics: Visual analysis of dangerous situations in multi-match data

From game events to team tactics: Visual analysis of dangero...

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International Conference on Technology and Innovation in Sports, Health and Wellbeing (TISHW)

作者： Manuel Stein Halldór Janetzko Andreas Lamprecht Daniel Seebacher Tobias Schreck Daniel Keim Michael Grossniklaus Department of Computer and Information Science University of Konstanz Institute for Computer Graphics and Knowledge Visualization Graz University of Technology

ISBN: (纸本)9781509057283

Sport analytics in general and soccer analytics in particular constitute quickly growing markets when it comes to professional analyses and visualizations. From a data analysis research perspective, soccer is a rich source of geospatial and temporal movement data, with high details and a controlled environment. However, soccer movement is complex as its compounds are actions and reactions of two opposing teams with inverse goals. Common analyses performed today are typically oriented towards statistical analysis and considering aggregate measurements. In this work, we propose a set of effective visual-interactive methods for investigating set plays as a first step towards semi-automated analysis of tactic behavior. In our analytic design, we follow the so-called Information-seeking Mantra by Ben Shneiderman by providing overview visualizations, interactive refinements, and detailed analysis views. We take an applied approach in showing case studies that give evidence for the applicability and merits of our proposed techniques.

关键词： Data visualization visualization Technological innovation Games Data analysis Computational modeling Analytical models

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Volume visualization on sparse grids Texture hardware based volume rendering on compressed data sets

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Computing and visualization in Science 1999年第1期2卷 47-59页

作者： Teitzel, Christian Hopf, Matthias Grosso, Roberto Ertl, Thomas Computer Graphics Group University of Erlangen Am Weichselgarten 9 D-91058 Erlangen Germany Visualization and Interactive Systems Group IfI University of Stuttgart Breitwiesenstr. 20-22 D-70565 Stuttgart Germany Siemens AG Werner-von-Siemens-Str. 60 D-91052 Erlangen Germany

Volume rendering is an important technique of displaying volumetric three-dimensional scalar data sets resulting from measurement or simulation. Additionally, sparse grids are of increasing interest in numerical simulations. Based upon hierarchical tensor product bases, the sparse grid approach is a very efficient one improving the ratio of invested storage and computing time to the achieved accuracy for many problems in the area of numerical solution of partial differential equations, for instance in numerical fluid mechanics. The volume visualization algorithms that are available so far cannot cope with sparse grids. We present an approach that directly works on these grids. As a second aspect in this paper, we suggest to use sparse grids as a data compression method in order to visualize huge data sets even on workstations with low main memory. Since the size of data sets used in numerical simulations is still growing, this feature makes it possible that workstations can continue to handle these data sets. In addition to the standard sparse grid interpolation algorithm and the so-called combination technique, we have developed a new sparse grid interpolation method, which harnesses the texture-mapping hardware of graphics workstations for acceleration purposes. Therefore, hardware based volume rendering becomes possible on compressed data sets at interactive frame rates. This is not possible if other compression methods like wavelet or fractal compression are used. © 1999 Springer-Verlag.

关键词： Volume rendering

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Immersive virtual studio for architectural exploration

Immersive virtual studio for architectural exploration

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Gerd Bruder Frank Steinicke Dimitar Valkov Klaus Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

ISBN: (纸本)9781424468461;9781424468447

Architects use a variety of analog and digital tools and media to plan and design constructions. Immersive virtual reality (VR) technologies have shown great potential for architectural design, especially for exploration and review of design proposals. In this work we propose a virtual studio system, which allows architects and clients to use arbitrary real-world tools such as maps or rulers during immersive exploration of virtual 3D models. The user interface allows architects and clients to review designs and compose 3D architectural scenes, combining benefits of mixed-reality environments with immersive head-mounted display setups.

关键词： Virtual reality User interfaces Layout Cameras computer graphics Legged locomotion Laboratories computer displays Three dimensional displays Process design

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Arch-Explore: A natural user interface for immersive architectural walkthroughs

Arch-Explore: A natural user interface for immersive archite...

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IEEE Symposium on 3D User Interfaces (3DUI)

作者： Gerd Bruder Frank Steinicke Klaus H. Hinrichs Visualization and Computer Graphics (VisCG) Research Group Department of Computer Science University of Münster Munster Germany

In this paper we propose the Arch-Explore user interface, which supports natural exploration of architectural 3D models at different scales in a real walking virtual reality (VR) environment such as head-mounted display (HMD) or CAVE setups. We discuss in detail how user movements can be transferred to the virtual world to enable walking through virtual indoor environments. To overcome the limited interaction space in small VR laboratory setups, we have implemented redirected walking techniques to support natural exploration of comparably large-scale virtual models. Furthermore, the concept of virtual portals provides a means to cover long distances intuitively within architectural models. We describe the software and hardware setup and discuss benefits of Arch-Explore.

关键词： User interfaces Legged locomotion Virtual reality computer graphics Indoor environments Laboratories Hardware Virtual environment Haptic interfaces Feedback

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