@article{Lampe2007TMV, author = {Ove Daae Lampe and Ivan Viola and Nathalie Reuter and Helwig Hauser}, title = {Two-Level Approach to Efficient Visualization of Protein Dynamics}, year = {2007}, month = {nov}, abstract = {Proteins are highly flexible and large amplitude deformations of their structure, also called slow dynamics, are often decisive to their function. We present a two-level rendering approach that enables visualization of slow dynamics of large protein assemblies. Our approach is aligned with a hierarchical model of large scale molecules. Instead of constantly updating positions of large amounts of atoms, we update the position and rotation of residues, i.e., higher level building blocks of a protein. Residues are represented by one vertex only indicating its position and additional information defining the rotation. The atoms in the residues are generated on-the-fly on the GPU, exploiting the new graphics hardware geometry shader capabilities. Moreover, we represent the atoms by billboards instead of tessellated spheres. Our representation is then significantly faster and pixel precise. We demonstrate the usefulness of our new approach in the context of our collaborative bioinformatics project.}, journal = {IEEE Transactions on Visualization and Computer Graphics (IEEE TVCG)}, event = "IEEE Visualization 2007", volume = {13}, number = {6}, pages = {1616--1623}, location = "Sacramento, California, USA", pdf = {pdfs/lampe_2007_tvcg.pdf}, ISSN = {1077-2626} images = {images/moleculevr_single_mol-20070329-0857270.jpeg, images/color_per_chain.jpeg, images/nanoThickWallSleveCHonly_anaglyph.jpeg, images/phi29Contour.jpeg, images/python 2007-06-25 23-07-54-84.jpeg, images/python 2007-06-25 23-31-18-14.jpeg}, thumbnails = {images/moleculevr_single_mol-20070329-0857270_thumb.jpeg, images/color_per_chain_thumb.jpeg, images/nanoThickWallSleveCHonly_anaglyph_thumb.jpeg, images/phi29Contour_thumb.jpeg, images/python 2007-06-25 23-07-54-84_thumb.jpeg, images/python 2007-06-25 23-31-18-14_thumb.jpeg}, } @article{oeltze07perfusion, author = {Steffen Oeltze and Helmut Doleisch and Helwig Hauser and Philipp Muigg and Bernhard Preim}, title = {Interactive Visual Analysis of Perfusion Data}, journal = {IEEE Transactions on Visualization and Computer Graphics (IEEE TVCG)}, volume = {13}, number = {6}, year = {2007}, month = {nov}, issn = {1077-2626}, pages = {1392-1399}, publisher = {IEEE Computer Society}, location = "Sacramento, California, USA", event = {IEEE Visualization 2007}, abstract = {Perfusion data are dynamic medical image data which characterize the regional blood flow in human tissue. These data bear a great potential in medical diagnosis, since diseases can be better distinguished and detected at an earlier stage compared to static image data. The wide-spread use of perfusion data is hampered by the lack of efficient evaluation methods. For each voxel, a time-intensity curve characterizes the enhancement of a contrast agent. Parameters derived from these curves characterize the perfusion and have to be integrated for diagnosis. The diagnostic evaluation of this multi-field data is challenging and time-consuming due to its complexity. For the visual analysis of such datasets, feature-based approaches allow to reduce the amount of data and direct the user to suspicious areas. We present an interactive visual analysis approach for the evaluation of perfusion data. For this purpose, we integrate statistical methods and interactive feature specification. Correlation analysis and Principal Component Analysis (PCA) are applied for dimensionreduction and to achieve a better understanding of the inter-parameter relations. Multiple, linked views facilitate the definition of features by brushing multiple dimensions. The specification result is linked to all views establishing a focus+context style of visualization in 3D. We discuss our approach with respect to clinical datasets from the three major application areas: ischemic stroke diagnosis, breast tumor diagnosis, as well as the diagnosis of the coronary heart disease (CHD). It turns out that the significance of perfusion parameters strongly depends on the individual patient, scanning parameters, and data pre-processing.}, URL = {http://dx.doi.org/10.1109/TVCG.2007.70569}, thumbnails = {images/oeltze07perfusion_thumb.png, images/oeltze07perfusion1_thumb.png}, images = {images/oeltze07perfusion.png, images/oeltze07perfusion1.png} } @article{muigg07hybrid, author = {Philipp Muigg and Markus Hadwiger and Helmut Doleisch and Helwig Hauser}, title = {Scalable Hybrid Unstructured and Structured Grid Raycasting}, journal = {IEEE Transactions on Visualization and Computer Graphics (IEEE TVCG)}, volume = {13}, number = {6}, year = {2007}, month = {nov}, issn = {1077-2626}, pages = {1592--1599}, location = "Sacramento, California, USA", event = {IEEE Visualization 2007}, abstract = {This paper presents a scalable framework for real-time raycasting of large unstructured volumes that employs a hybrid bricking approach. It adaptively combines original unstructured bricks in important (focus) regions, with structured bricks that are resampled on demand in less important (context) regions. The basis of this focus+context approach is interactive specification of a scalar degree-of-interest (DOI) function. Thus, rendering always considers two volumes simultaneously: a scalar data volume, and the current DOI volume. The crucial problem of visibility sorting is solved by raycasting individual bricks and compositing in visibility order from front to back. In order to minimize visual errors at the grid boundary, it is always rendered accurately, even for resampled bricks. A variety of different rendering modes can be combined, including contour enhancement. A very important property of our approach is that it supports a variety of cell types natively, i.e., it is not constrained to tetrahedral grids, even when interpolation within cells is used. Moreover, our framework can handle multi-variate data, e.g., multiple scalar channels such as temperature or pressure, as well as time-dependent data. The combination of unstructured and structured bricks with different quality characteristics such as the type of interpolation or resampling resolution in conjunction with custom texture memory management yields a very scalable system.}, URL = {http://dx.doi.org/10.1109/TVCG.2007.70588}, publisher = {IEEE Computer Society}, thumbnails = {images/muigg07hybrid_thumb.png, images/muigg07hybrid1_thumb.png, images/muigg07hybrid2_thumb.png}, images = {images/muigg07hybrid.png, images/muigg07hybrid1.png, images/muigg07hybrid2.png} } @inproceedings{patel_daniel_2007_IRSD, title = "Illustrative Rendering of Seismic Data", author = "Daniel Patel and Christopher Giertsen and John Thurmond and Meister Eduard Gr{\"o}ller", year = "2007", abstract = "In our work we present techniques for illustrative rendering of interpreted seismic volume data by adopting elements from geology book illustrations. We also introduce combined visualization techniques of interpreted and uninterpreted data for validation, comparison and interdisciplinary communication reasons. We introduce the concept of smooth transitions between these two semantical levels. To achieve this we present transfer functions that map seismic volume attributes to 2D textures that flow according to a deformation volume describing the buckling and discontinuities of the layers of the seismic data.", pages = "13--22", month = nov, booktitle = "Proceeding of Vision Modeling and Visualization 2007", editor = "Hendrik Lensch, Bodo Rosenhahn, H.P. Seidel", journal = "Vision, Modelling and Visualization", location = "Saarbr{\"u}cken, Germany", URL = "http://www.cg.tuwien.ac.at/research/publications/2007/patel_daniel_2007_IRSD/", pdf = {pdfs/patel_daniel_2007_IRSD-paper.pdf}, images = {images/patel_daniel_2007_IRSD-Illustrative%20rendering.png}, thumbnails = {images/patel_daniel_2007_IRSD-Illustrative%20rendering_thumb.png}, } @inproceedings{viola07ort, title = "On the Role of Topology in Focus+Context Visualization", author = "Ivan Viola and Meister Eduard Gr{\"o}ller", year = "2007", abstract = "In this paper three types of visualization scenarios are discussed, where topology improves the readability of particular visualization results. The first type combines topology information represented by simple graphical primitives with other forms of visual representations. The second type uses the topology information to define the relevance of objects within the data. The relevance is re ected in the visualization by applying the cut-away concept. The third type of visualizations is based on the change of topology of the underlying data to increase visibility of the most interesting information. Every type handles topology in a different way. This illustrates various roles of topology in scientific visualization.", pages = "171--181", month = sep, booktitle = "Topology-based Methods in Visualization (Proc. of TopoInVis 2005)", editor = "H. Hauser, H. Hagen, H. Theisel", publisher = "Springer", location = "Budmerice, Slovakia", URL = "http://www.cg.tuwien.ac.at/research/publications/2007/viola-2007-ort/", thumbnails = {images/viola07topology_thumb.png}, images = {images/viola07topology.png} } @inproceedings{toth-2007-ndd, title = "N-dimensional Data-Dependent Reconstruction Using Topological Changes", author = "Zsolt Toth and Ivan Viola and Andrej Ferko and Meister Eduard Gr{\"o}ller", year = "2007", abstract = "We introduce a new concept for a geometrically based feature preserving reconstruction technique of n-dimensional scattered data. Our goal is to generate an n-dimensional triangulation, which preserves the high frequency regions via local topology changes. It is the generalization of a 2D reconstruction approach based on data-dependent triangulation and Lawson‘s optimization procedure. The definition of the mathematic optimum of the reconstruction is given. We discuss an original cost function and a generalization of known functions for the n-dimensional case.", pages = "183--198", month = sep, booktitle = "Topology-based Methods in Visualization (Proc. of TopoInVis 2005)", editor = "H. Hauser, H. Hagen, H. Theisel", publisher = "Springer", location = "Budmerice, Slovakia", URL = "http://www.cg.tuwien.ac.at/research/publications/2007/toth-2007-ndd/", thumbnails = {images/toth07ndd_thumb.jpg}, images = {images/toth07ndd.jpg} } @inproceedings{buerger2007star, title = "Visualization of Multi-variate Scientific Data", author = "Raphael B{\"u}rger and Helwig Hauser", year = "2007", abstract = "In this state-of-the-art report we discuss relevant research works related to the visualization of complex, multi-variate data. We focus on ''non-classical'' approaches, i.e. approaches which haven't been discussed in previous related reports, and we highlight techniques which potentially lead towards new directions in visualization research. We discuss how different techniques take effect at specific stages of the visualization pipeline and how they apply to multi-variate data sets being composed of scalars, vectors, and tensors. We also provide a categorization of these techniques in the aim for a better overview of related approaches. In the second part of this paper we take a look at recent techniques that are useful for the visualization of complex data sets either because they are general purpose or because they can be adapted to specific problems.", pages = "117--134", booktitle = "EuroGraphics 2007 State of the Art Reports (STARs)", isbn = "1017-4656", keywords = "scientific data, multi-variate data", event = {EuroGraphics 2007}, location = {Prague, Czech Republic} URL = "http://www.cg.tuwien.ac.at/research/publications/2007/buerger-2007-star/", thumbnails = {images/buerger07star1_thumb.png, images/buerger07star2_thumb.png}, images = {images/buerger07star1.png, images/buerger07star2.png} } @inproceedings{konyha07timing_chain, title = "Interactive Visual Analysis of a Timing Chain Drive Using Segmented Curve View and other Coordinated Views", author = "Zoltán Konyha and Kresimir Matkovix and Denis Graxanin and Mario Duras and Josip Juric and Helwig Hauser", year = "2007", abstract = "A timing chain drive transfers motion from the engine's crankshaft to the camshaft that operates the valves. The design process of timing chain drives involves computer simulation of many design variants in order to find an optimum. Most of the simulation results can be represented as families of function graphs (data series). Previously, the analysis of those results was based on static 2D diagrams and animated 3D visualizations. They were suitable for the detailed analysis of a few simulation variants, but not for the comparison of many cases. In this paper we propose a new approach to the analysis based on coordinated linked views and advanced brushing features. Our proposed method supports the interactive analysis of many design variants. We introduce a novel view, called segmented curve view, which can display distributions in families of function graphs. The segmented curve view combines individual function graphs where for a fixed value of the independent variable, a bar extends from minimum to maximum values across the family of function graphs. Each bar is divided into segments (bins) with a color that represents the number of function graphs with the value in that segment. In the case study, we demonstrate that the new view combined with "traditional" views provides a strong support for the interactive visual exploration and analysis of a real world timing chain design problem.", pages = "3-15", month = 7, booktitle = "Proceeding of the 5th Intern. Conference on Coordinated & Multiple Views in Exploratory Visualization (CMV 2007)", location = "Z{\"u}rich, Switzerland", URL = {http://dx.doi.org/10.1109/CMV.2007.13}, images = {images/konya07timing_chain2.png, images/konya07timing_chain.png, images/konya07timing_chain1.png}, thumbnails = {images/konya07timing_chain2_thumb.png, images/konya07timing_chain_thumb.png, images/konya07timing_chain1_thumb.png}, } @inproceedings{matkovic07color_lines_view, title = "Color Lines View: An Approach to Visualization of Families of Function Graphs", author = "Kresimir Matkovic and Denis Gracanin and Zoltán Konyha and Helwig Hauser", year = "2007", abstract = "Data sets often include information that can be represented as a mapping that describes how a dependent variable depends on an independent variable. Such a mapping, usually represented as a function graph, can be parameterized to provide a family of function graphs. The challenge is how to efficiently aggregate individual function graph views to represent the whole family and allow visual analysis and search for patterns. We propose a novel view, called the color lines view, which provides a two dimensional, rectangular view where each line represents a single function graph. The points on the line correspond to values of the independent variable. The point colors represent the value of the dependent variable. The lines, placed next to each other in parallel, show a family of function graphs. The color lines view offers sorting and brushing features which support visual analysis procedures that are difficult to perform with previously existing views.", pages = "59-64", month = 7, booktitle = "Proceeding of the 11th International Conference on Information Visualization (IV 2007)", location = "Z{\"u}rich, Switzerland", URL = {http://dx.doi.org/10.1109/IV.2007.35}, images = {images/matkovic07color_lines_view1.png, images/matkovic07color_lines_view.png}, thumbnails = {images/matkovic07color_lines_view1_thumb.png, images/matkovic07color_lines_view_thumb.png}, } @INPROCEEDINGS{Balabanian2007, author = {Jean-Paul Balabanian and Ivan Viola and Egil Ona and Ruben Patel and Eduard Gr{\"o}ller}, title = {Sonar Explorer: A New Tool for Visualization of Fish Schools from {3D} Sonar Data}, booktitle = {Data Visualization - EuroVis 2007}, year = {2007}, editor = {K. Museth and T. M{\"o}ller and A. Ynnerman}, pages = {155--162}, month = {may}, publisher = {Eurographics Association}, abstract = {We present a novel framework for analysis and visualization of fish schools in 3D sonar surveys. The 3D sonar technology is new and there have not been applications to visualize the data in 3D. We have created an application called Sonar Explorer that satisfies the requirements of domain scientists. Sonar Explorer provides easy and intuitive semi-automatic fish school tracking and survey map generation. The overall pipeline is described and all pipeline stages relevant for visualization are highlighted. We present techniques to deal with 3D sonar data specifics: highly anisotropic volume data aligned on a curvilinear grid. Domain scientists provide initial impressions on interaction and outlook.}, ISBN = {978-3-905673-45-6}, location = {Norrk{\"o}ping, Sweden}, event = {EuroVis 2007}, pdf = {pdfs/Balabanian2007.pdf}, thumbnails = {images/balabanian_2007_eurovis_thumb.png}, images = {images/balabanian_2007_eurovis.png} } @InProceedings {Burns2007, author = "Michael Burns and Martin Haidacher and Wolfgang Wein and Ivan Viola and Eduard Gr{\"o}ller", title = "Feature Emphasis and Contextual Cutaways for Multimodal Medical Visualization", booktitle = "Proceedings of Eurographics / IEEE VGTC Symposium on Visualization (EuroVis 2007)", year = "2007", month = may, pages = "275--282" abstract = "Dense clinical data like 3D Computed Tomography (CT) scans can be visualized together with real-time imaging for a number of medical intervention applications. However, it is difficult to provide a fused visualization that allows sufficient spatial perception of the anatomy of interest, as derived from the rich pre-operative scan, while not occluding the real-time image displayed embedded within the volume. We propose an importance-driven approach that presents the embedded data such that it is clearly visible along with its spatial relation to the surrounding volumetric material. To support this, we present and integrate novel techniques for importance specification, feature emphasis, and contextual cutaway generation. We show results in a clinical context where a pre-operative CT scan is visualized alongside a tracked ultrasound image, such that the important vasculature is depicted between the viewpoint and the ultrasound image, while a more opaque representation of the anatomy is exposed in the surrounding area.", location = {Norrk{\"o}ping, Sweden}, event = {EuroVis 2007}, url = {http://www.cs.princeton.edu/gfx/pubs/Burns_2007_FEA/}, thumbnails = {images/burns07eurovis_thumb.jpg, images/burns07eurovis2_thumb.jpg}, images = {images/burns07eurovis.jpg, images/burns07eurovis2.jpg} } @Article {Gilja2007, author = {Odd Helge Gilja and Trygve Hausken and Jan G. Hatlebakk and Svein {\O}degaard and Arnold Berstad and Ivan Viola and Christopher Giertsen and Hans Gregersen} journal = {World Journal of Gastroenterology}, number = {9}, pages = {1408--1421}, title = {Advanced Imaging and Visualization in Gastrointestinal Disorders}, url = {http://www.wjgnet.com/1007-9327/13/1408.asp}, volume = {13}, year = {2007}, abstract = {Advanced medical imaging and visualization has a strong impact on research and clinical decision making in gastroenterology. The aim of this paper is to show how imaging and visualization can disclose structural and functional abnormalities of the gastrointestinal (GI) tract. Imaging methods such as ultrasonography, magnetic resonance imaging (MRI), endoscopy, endosonography, and elastography will be outlined and visualization with Virtual Reality and haptic methods. Ultrasonography is a versatile method that can be used to evaluate antral contractility, gastric emptying, transpyloric flow, gastric configuration, intragastric distribution of meals, gastric accommodation and strain measurement of the gastric wall. Advanced methods for endoscopic ultrasound, three-dimensional (3D) ultrasound, and tissue Doppler ( Strain Rate Imaging) provide detailed information of the GI tract. Food hypersensitivity reactions including gastrointestinal reactions due to food allergy can be visualized by ultrasonography and MRI. Development of multi- parametric and multi-modal imaging may increase diagnostic benefits and facilitate fusion of diagnostic and therapeutic imaging in the future.}, pdf = {http://www.wjgnet.com/1007-9327/13/1408.pdf}, thumbnails = {images/gilja_2007_wjg_thumbnail.jpg}, images = {images/gilja_2007_wjg.jpg}, }