Now showing items 1-20 of 53

    • iVisClustering: An Interactive Visual Document Clustering via Topic Modeling 

      Lee, Hanseung; Kihm, Jaeyeon; Choo, Jaegul; Stasko, John; Park, Haesun (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Clustering plays an important role in many large-scale data analyses providing users with an overall understand- ing of their data. Nonetheless, clustering is not an easy task due to noisy features and outliers existing ...
    • Probabilistic Local Features in Uncertain Vector Fields with Spatial Correlation 

      Petz, Christoph; Pöthkow, Kai; Hege, Hans-Christian (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      In this paper methods for extraction of local features in crisp vector fields are extended to uncertain fields. While in a crisp field local features are either present or absent at some location, in an uncertain field ...
    • Using Signposts for Navigation in Large Graphs 

      May, Thorsten; Steiger, Martin; Davey, James; Kohlhammer, Jörn (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      In this paper we present a new Focus & Context technique for the exploration of large, abstract graphs. Most Focus & Context techniques present context in a visual way. In contrast, our technique uses a symbolic representation: ...
    • Graph Bundling by Kernel Density Estimation 

      Hurter, Christophe; Ersoy, Ozan; Telea, Alex (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present a fast and simple method to compute bundled layouts of general graphs. For this, we first transform a given graph drawing into a density map using kernel density estimation. Next, we apply an image sharpening ...
    • Comparative Evaluation of an Interactive Time-Series Visualization that Combines Quantitative Data with Qualitative Abstractions 

      Aigner, Wolfgang; Rind, Alexander; Hoffmann, Stephan (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      In many application areas, analysts have to make sense of large volumes of multivariate time-series data. Explorative analysis of this kind of data is often difficult and overwhelming at the level of raw data. Temporal ...
    • Reliable Adaptive Modelling of Vascular Structures with Non-Circular Cross-Sections 

      Kretschmer, Jan; Beck, Thomas; Tietjen, Christian; Preim, Bernhard; Stamminger, Marc (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Accurate visualizations of complex vascular structures are essential for medical applications, such as diagnosis, therapy planning and medical education. Vascular trees are usually described using centerlines, since they ...
    • Travel-Route-Centered Metro Map Layout and Annotation 

      Wu, Hsiang-Yun; Takahashi, Shigeo; Lin, Chun-Cheng; Yen, Hsu-Chun (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      When providing travel guides for a specific route in a metro network, we often place the route around the center of the map and annotate stations on the route with thumbnail photographs. Nonetheless, existing methods do ...
    • Computing Voronoi Treemaps: Faster, Simpler, and Resolution-independent 

      Nocaj, Arlind; Brandes, Ulrik (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Voronoi treemaps represent hierarchies as nested polygons. We here show that, contrary to the apparent popular belief, utilization of an algorithm for weighted Voronoi diagrams is not only feasible, but also more efficient ...
    • Visualization of 4D Blood-Flow Fields by Spatiotemporal Hierarchical Clustering 

      Pelt, Roy van; Jacobs, Sander; Romeny, Bart ter Haar; Vilanova, Anna (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Advancements in the acquisition and modeling of flow fields result in unsteady volumetric flow fields of unprecedented quality. An important example is found in the analysis of unsteady blood-flow data. Preclinical research ...
    • The World's Languages Explorer: Visual Analysis of Language Features in Genealogical and Areal Contexts 

      Rohrdantz, Christian; Hund, Michael; Mayer, Thomas; Wälchli, Bernhard; Keim, Daniel A. (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      This paper presents a novel Visual Analytics approach that helps linguistic researchers to explore the world's languages with respect to several important tasks: (1) The comparison of manually and automatically extracted ...
    • A Quantized Boundary Representation of 2D Flows 

      Levine, Joshua; Jadhav, Shreeraj; Bhatia, Harsh; Pascucci, Valerio; Bremer, Peer-Timo (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Analysis and visualization of complex vector fields remain major challenges when studying large scale simulation of physical phenomena. The primary reason is the gap between the concepts of smooth vector field theory and ...
    • A Qualitative Study on the Exploration of Temporal Changes in Flow Maps with Animation and Small-Multiples 

      Boyandin, Ilya; Bertini, Enrico; Lalanne, Denis (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present a qualitative user study analyzing findings made while exploring changes over time in spatial interactions. We analyzed findings made by the study participants with flow maps, one of the most popular representations ...
    • Kelp Diagrams: Point Set Membership Visualization 

      Dinkla, Kasper; Kreveld, Marc van; Speckmann, Bettina; Westenberg, Michel A. (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present Kelp Diagrams, a novel method to depict set relations over points, i.e., elements with predefined positions. Our method creates schematic drawings and has been designed to take aesthetic quality, efficiency, and ...
    • Nearly Recurrent Components in 3D Piecewise Constant Vector Fields 

      Szymczak, Andrzej; Brunhart-Lupo, Nicholas (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present an algorithm for computing nearly recurrent components, that represent areas of close to circulating or stagnant flow, for 3D piecewise constant (PC) vector fields defined on regular grids. Using a number of ...
    • Document Thumbnails with Variable Text Scaling 

      Stoffel, Andreas; Strobelt, Hendrik; Deussen, Oliver; Keim, Daniel A. (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Document reader applications usually offer an overview of the layout for each page as thumbnail views. Reading the text in these becomes impossible when the font size becomes very small. We improve the readability of these ...
    • Scalable Detection of Spatiotemporal Encounters in Historical Movement Data 

      Bak, Peter; Marder, Mattias; Harary, Sivan; Yaeli, Avi; Ship, Harold J. (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      The widespread adoption of location-aware devices is resulting in the generation of large amounts of spatiotemporal movement data, collected and stored in digital repositories. This forms a fertile ground for domain experts ...
    • Visualization of Advection-Diffusion in Unsteady Fluid Flow 

      Karch, Grzegorz Karol; Sadlo, Filip; Weiskopf, Daniel; Munz, Claus-Dieter; Ertl, Thomas (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Advection has been the standard transport mechanism in flow visualization. Diffusion, in contrast, has not been considered important in visual flow field analysis so far, although it is inherent to many physical processes. ...
    • MatchPad: Interactive Glyph-Based Visualization for Real-Time Sports Performance Analysis 

      Legg, Philip; Chung, David H. S.; Parry, Matthew L.; Jones, Mark W.; Long, Rhys; Griffiths, Iwan W.; Chen, Min (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Today real-time sports performance analysis is a crucial aspect of matches in many major sports. For example, in soccer and rugby, team analysts may annotate videos during the matches by tagging specific actions and events, ...
    • Importance Driven Automatic Color Design for Direct Volume Rendering 

      Wang, Lei; Kaufman, Arie (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      This paper introduces an automatic color design method that is driven by an importance function of the objects within a volumetric dataset. Our method allows the user to intuitively modify the object classification and the ...
    • Visualization of Global Correlation Structures in Uncertain 2D Scalar Fields 

      Pfaffelmoser, Tobias; Westermann, Rüdiger (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Visualizing correlations, i.e., the tendency of uncertain data values at different spatial positions to change contrarily or according to each other, allows inferring on the possible variations of structures in the data. ...