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Mathematics and visualization 2014年 37卷 305-324页

作者： Vilanova, A. Preim, Bernhard van Pelt, Roy Gasteiger, Rocco Neugebauer, Mathias Wischgoll, Thomas Computer Graphics and Visualization EEMCS - Delft University of Technology 270 Building 36 - Mekelweg 4 2628 CD Delft Postbox 5 Delft2600 AA Netherlands Institut Für Simulation Und Graphik Otto-von-Guericke-Universität Magdeburg Magdeburg Germany Computer Science and Engineering Wright State University Dayton United States

Morphology of cardiovascular tissue is influenced by the unsteady behavior of the blood flow and vice versa. Therefore, the pathogenesis of several cardiovascular diseases is directly affected by the blood-flow dynamics. Understanding flow behavior is of vital importance to understand the cardiovascular system and potentially harbors a considerable value for both diagnosis and risk assessment. The analysis of hemodynamic characteristics involves qualitative and quantitative inspection of the blood-flow field. visualization plays an important role in the qualitative exploration, as well as the definition of relevant quantitative measures and its validation. There are two main approaches to obtain information about the blood flow: simulation by computational fluid dynamics, and in-vivo measurements. Although research on blood flow simulation has been performed for decades, many open problems remain concerning accuracy and patient-specific solutions. Possibilities for real measurement of blood flow have recently increased considerably by new developments inmagnetic resonance imaging which enable the acquisition of 3Dquantitative measurements of blood-flow velocity fields. This chapter presents the visualization challenges for both simulation and real measurements of unsteady blood-flow fields. © Springer-Verlag London 2014.

关键词： Flow fields

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Highlights from the 5th Symposium on Biological Data visualization: Part 2

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BMC proceedings 2015年第SUPPL 6 PROCEEDINGS OF THE 5TH SYMPOSIUM ON BIOLOGICAL DATA期9卷 S1页

作者： Jan Aerts G Elisabeta Marai Kay Nieselt Cydney Nielsen Marc Streit Daniel Weiskopf Visual Data Analysis Lab ESAT/STADIUS KU Leuven Kasteelpark Arenberg 10 3001 Leuven Belgium iMinds Medical IT KU Leuven Kasteelpark Arenberg 10 3001 Leuven Belgium. Electronic Visualization Lab University of Illinois at Chicago 851 S. Morgan St Chicago IL 60607 USA. Center for Bioinformatics University of Tübingen Sand 14 72076 Tübingen Germany. Department of Pathology and Laboratory Medicine University of British Columbia and British Columbia Cancer Agency 675 West 10th Avenue Vancouver British Columbia V5Z 1L3 Canada. Institute of Computer Graphics Johannes Kepler University Linz Altenberger Straße 69 4020 Linz Austria. VISUS University of Stuttgart Allmandring 19 70569 Stuttgart Germany.

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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

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12th International Conference on Mobile and Ubiquitous Multimedia, MUM 2013

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

ISBN: (纸本)9781450326483

As applications originating on desktop computers find their way onto multi-touch enabled mobile devices many inter- action tasks that were designed for computer mice spread to new touch-based environments. One example is region selection, for instance in image editing applications. Several studies already investigated multi-touch object selections however, region selections have not been closely examined. Our proposed selection technique was designed for multi- touch interaction and better suits mobile devices. Taking advantage of multiple touches enables the user to easily extend, modify and refine selections based on the order and relative position|the context|of touches. We were concerned that controlling more degrees of freedom with our technique could negatively impact simple selections. To evaluate its performance we present a user study that compares it to currently used techniques. Results show that our multi-touch region selection represents a good compromise of speed and precision, while providing the possibility to easily refine the selected region. © 2013 ACM.

关键词： Personal computers

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Implicit mesh generation using volumetric subdivision 13

Implicit mesh generation using volumetric subdivision

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13th Workshop on Virtual Reality Interactions and Physical Simulations, VRIPHYS 2017

作者： Altenhofen, C. Schuwirth, F. Stork, A. Fellner, D. TU Darmstadt Germany Fraunhofer IGD Germany Graz University of Technology Institute of Computer Graphics and Knowledge Visualization Austria

ISBN: (纸本)9783038680321

In this paper, we present a novel approach for a tighter integration of 3D modeling and physically-based simulation. Instead of modeling 3D objects as surface models, we use a volumetric subdivision representation. Volumetric modeling operations allow designing 3D objects in similar ways as with surface-based modeling tools. Encoding the volumetric information already in the design mesh drastically simplifies and speeds up the mesh generation process for simulation. The transition between design, simulation and back to design is consistent and computationally cheap. Since the subdivision and mesh generation can be expressed as a precomputable matrix-vector multiplication, iteration times can be greatly reduced compared to common modeling and simulation setups. Therefore, this approach is especially well suited for early-stage modeling or optimization use cases, where many geometric changes are made in a short time and their physical effect on the model has to be evaluated frequently. To test our approach, we created, simulated and adapted several 3D models. Additionally, we measured and evaluated the timings for generating and applying the matrices for different subdivision levels. For comparison, we also measured the tetrahedral meshing functionality offered by CGAL for similar numbers of elements. For changing topology, our implicit meshing approach proves to be up to 70 times faster than creating the tetrahedral mesh only based on the outer surface. Without changing the topology and by precomputing the matrices, we achieve a speed-up of up to 2800. © 2017 The Author(s) Eurographics Proceedings 2017 The Eurographics Association.

关键词： Mesh generation

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Adding context to multi-touch region selections 13

Adding context to multi-touch region selections

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2013 8th ACM International Conference on Interactive Tabletops and Surfaces, ITS 2013

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

ISBN: (纸本)9781450322713

As applications that originated on desktop computers find their way onto new multi-touch enabled devices many interaction tasks that were designed for keyboards and computer mice spread to new touch-based environments. One example is the selection of regions, for instance in image editing applications. While there are already several studies involving multi-touch object selections, region selections have not been closely examined. Instead of using traditional mouse-based interaction schemes we propose a multi-touch selection technique that better suits touch-based devices. Based on this technique we propose a novel way to take advantage of multiple touches to easily extend, modify and refine selections based on the order and relative position - the context - of touches. © 2013 Authors.

关键词： Personal computers

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From individual to population: Challenges in medical visualization

Mathematics and Visualization

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Mathematics and visualization 2014年 37卷 265-282页

作者： Botha, C.P. Preim, B. Kaufman, A.E. Takahashi, S. Ynnerman, A. Vxlabs Somerset WestSA South Africa Department of Simulation and Graphics University of Magdeburg Magdeburg Germany Department of Computer Science Stony Brook University NY United States Graduate School of Frontier Sciences The University of Tokyo Tokyo Japan Norrköping Visualization and Interaction Studio Linköping University Linköping Sweden

Due to continuing advances in medical imaging technology, and in medicine itself, techniques for visualizing medical image data have become increasingly important. In this chapter, we present a brief overview of the past 30 years of developments in medical visualization, after which we discuss the research challenges that we foresee for the coming decade. © 2014, Springer-Verlag London.

关键词： visualization

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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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A dense medial descriptor for image analysis

A dense medial descriptor for image analysis

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8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Van Der Zwan, Matthew Meiburg, Yuri Telea, Alexandru Scientific Visualization and Computer Graphics University of Groningen Nijenborgh 9 Groningen Netherlands University of Medicine and Pharmacy Carol Davila Bucharest Romania

ISBN: (纸本)9789898565471

We present dense medial descriptors, a new technique which generalizes the well-known medial axes to encode and manipulate whole 2D grayvalue images, rather than binary shapes. To compute our descriptors, we first reduce an image to a set of threshold-sets in luminance space. Next, we compute a simplified representation of each threshold-set using a noise-resistant medial axis transform. Finally, we use these medial axis transforms to perform a range of operations on the input image, from perfect reconstruction to segmentation, simplification, and artistic effects. Our pipeline can robustly handle any 2D grayscale image, is easy to use, and allows an efficient CPU or GPU-based implementation. We demonstrate our dense medial descriptors with several image-processing applications.

关键词： Image segmentation

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GPU-ASIFT: A fast fully affine-invariant feature extraction algorithm

GPU-ASIFT: A fast fully affine-invariant feature extraction ...

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2013 11th International Conference on High Performance Computing and Simulation, HPCS 2013

作者： Codreanu, Valeriu Dong, Feng Liu, Baoquan Roerdink, Jos B.T.M. Williams, David Yang, Po Yasar, Burhan Scientific Visualization and Computer Graphics Rijksuniversiteit Groningen Groningen Netherlands Department of Computer Science and Technology University of Bedfordshire Bedfordshire United Kingdom Rotasoft Inc United Kingdom

ISBN: (纸本)9781479908363

This paper presents a method that takes advantage of powerful graphics hardware to obtain fully affine-invariant image feature detection and matching. The chosen approach is the accurate, but also very computationally expensive, ASIFT algorithm. We have created a CUDA version of this algorithm that is up to 70 times faster than the original implementation, while keeping the algorithm's accuracy close to that of ASIFT. It's matching performance is therefore much better than that of other non-fully affine-invariant algorithms. Also, this approach was adapted to fit the multi-GPU paradigm in order to assess the acceleration potential from modern GPU clusters. © 2013 IEEE.

关键词： computer vision

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