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Title IEEE Transactions on Visualization and Computer Graphics table of contents archive
PublisherIEEE Educational Activities Department Piscataway, NJ, USA
ISSN: 1077-2626

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IEEE Transactions on Visualization and Computer Graphics

Volume 15 Issue 6, November 2009

Table of Contents
TVCG Vis/InfoVis 2009 Front Matter
Pages: i-XXVIII
doi>10.1109/TVCG.2009.193
Full text available: Publisher SitePublisher Site
ABySS-Explorer: Visualizing Genome Sequence Assemblies
Cydney B. Nielsen, Shaun D. Jackman, Inanç Birol, Steven J. M. Jones
Pages: 881-888
doi>10.1109/TVCG.2009.116
Full text available: Publisher SitePublisher Site

One bottleneck in large-scale genome sequencing projects is reconstructing the full genome sequence from the short subsequences produced by current technologies. The final stages of the genome assembly process inevitably require manual inspection of ...
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Constructing Overview + Detail Dendrogram-Matrix Views
Jin Chen, Alan M. MacEachren, Donna J. Peuquet
Pages: 889-896
doi>10.1109/TVCG.2009.130
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A dendrogram that visualizes a clustering hierarchy is often integrated with a re-orderable matrix for pattern identification. The method is widely used in many research fields including biology, geography, statistics, and data mining. However, most ...
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MizBee: A Multiscale Synteny Browser
Miriah Meyer, Tamara Munzner, Hanspeter Pfister
Pages: 897-904
doi>10.1109/TVCG.2009.167
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In the field of comparative genomics, scientists seek to answerquestions about evolution and genomic function by comparing thegenomes of species to find regions of shared sequences. Conservedsyntenic blocks are an important biological data abstraction ...
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GeneShelf: A Web-based Visual Interface for Large Gene Expression Time-Series Data Repositories
Bohyoung Kim, Bongshin Lee, Susan Knoblach, Eric Hoffman, Jinwook Seo
Pages: 905-912
doi>10.1109/TVCG.2009.146
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A widespread use of high-throughput gene expression analysis techniques enabled the biomedical research community to share a huge body of gene expression datasets in many public databases on the web. However, current gene expression data repositories ...
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Spatiotemporal Analysis of Sensor Logs using Growth Ring Maps
Peter Bak, Florian Mansmann, Halldor Janetzko, Daniel Keim
Pages: 913-920
doi>10.1109/TVCG.2009.182
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Abstract—Spatiotemporal analysis of sensor logs is a challenging research field due to three facts: a) traditional two-dimensional maps do not support multiple events to occur at the same spatial location, b) three-dimensional solutions introduce ...
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A Nested Model for Visualization Design and Validation
Tamara Munzner
Pages: 921-928
doi>10.1109/TVCG.2009.111
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We present a nested model for the visualization design process withfour layers: characterize the problem domain, abstract into operationson data types, design visual encoding and interaction techniques, andcreate algorithms to execute techniques efficiently. ...
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Conjunctive Visual Forms
Chris Weaver
Pages: 929-936
doi>10.1109/TVCG.2009.129
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Visual exploration of multidimensional data is a process of isolating and extracting relationships within and between dimensions. Coordinated multiple view approaches are particularly effective for visual exploration because they support precise expression ...
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Interaction Techniques for Selecting and Manipulating Subgraphs in Network Visualizations
Michael J. McGuffin, Igor Jurisica
Pages: 937-944
doi>10.1109/TVCG.2009.151
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We present a novel and extensible set of interaction techniques for manipulating visualizations of networks by selecting subgraphs and then applying various commands to modify their layout or graphical properties.Our techniques integrate traditional ...
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ActiviTree: Interactive Visual Exploration of Sequences in Event-Based Data Using Graph Similarity
Katerina Vrotsou, Jimmy Johansson, Matthew Cooper
Pages: 945-952
doi>10.1109/TVCG.2009.117
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The identification of significant sequences in large and complex event-based temporal data is a challenging problem with applications in many areas of today's information intensive society. Pure visual representations can be used for the analysis, but ...
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“Search, Show Context, Expand on Demand”: Supporting Large Graph Exploration with Degree-of-Interest
Frank van Ham, Adam Perer
Pages: 953-960
doi>10.1109/TVCG.2009.108
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A common goal in graph visualization research is the design of novel techniques for displaying an overview of an entire graph. However, there are many situations where such an overview is not relevant or practical for users, as analyzing the global structure ...
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A Comparison of User-Generated and Automatic Graph Layouts
Tim Dwyer, Bongshin Lee, Danyel Fisher, Kori Inkpen Quinn, Petra Isenberg, George Robertson, Chris North
Pages: 961-968
doi>10.1109/TVCG.2009.109
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The research presented in this paper compares user-generated and automatic graph layouts. Following the methods suggested by van Ham et al. (2008), a group of users generated graph layouts using both multi-touch interaction on a tabletop display and ...
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Smooth Graphs for Visual Exploration of Higher-Order State Transitions
Jorik Blaas, Charl Botha, Edward Grundy, Mark Jones, Robert Laramee, Frits Post
Pages: 969-976
doi>10.1109/TVCG.2009.181
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In this paper, we present a new visual way of exploring state sequencesin large observational time-series. A key advantage of our method is that it can directly visualizehigher-order state transitions.A standard first order state transitionis a sequence ...
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Configuring Hierarchical Layouts to Address Research Questions
Aidan Slingsby, Jason Dykes, Jo Wood
Pages: 977-984
doi>10.1109/TVCG.2009.128
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We explore the effects of selecting alternative layouts in hierarchical displays that show multiple aspects of large multivariate datasets, including spatial and temporal characteristics. Hierarchical displays of this type condition a dataset by multiple ...
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Visualizing Social Photos on a Hasse Diagram for Eliciting Relations and Indexing New Photos
Michel Crampes, Jeremy de Oliveira-Kumar, Sylvie Ranwez, Jean Villerd
Pages: 985-992
doi>10.1109/TVCG.2009.201
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Social photos, which are taken during family events or parties, represent individuals or groups of people. We show in this paper how a Hasse diagram is an efficient visualization strategy for eliciting different groups and navigating through them. However, ...
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Interactive Dimensionality Reduction Through User-defined Combinations of Quality Metrics
Sara Johansson, Jimmy Johansson
Pages: 993-1000
doi>10.1109/TVCG.2009.153
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Multivariate data sets including hundreds of variables are increasingly common in many application areas. Most multivariate visualization techniques are unable to display such data effectively, and a common approach is to employ dimensionality reduction ...
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Scattering Points in Parallel Coordinates
Xiaoru Yuan, Peihong Guo, He Xiao, Hong Zhou, Huamin Qu
Pages: 1001-1008
doi>10.1109/TVCG.2009.179
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In this paper, we present a novel parallel coordinates design integrated with points (Scattering Points in Parallel Coordinates, SPPC), by taking advantage of both parallel coordinates and scatterplots. Different from most multiple views visualization ...
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Bubble Sets: Revealing Set Relations with Isocontours over Existing Visualizations
Christopher Collins, Gerald Penn, Sheelagh Carpendale
Pages: 1009-1016
doi>10.1109/TVCG.2009.122
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While many data sets contain multiple relationships, depicting more than one data relationship within a single visualization is challenging. We introduce Bubble Sets as a visualization technique for data that has both a primary data relation with a semantically ...
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FromDaDy: Spreading Aircraft Trajectories Across Views to Support Iterative Queries
Christophe Hurter, Benjamin Tissoires, Stéphane Conversy
Pages: 1017-1024
doi>10.1109/TVCG.2009.145
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When displaying thousands of aircraft trajectories on a screen, the visualization is spoiled by a tangle of trails. The visual analysis is therefore difficult, especially if a specific class of trajectories in an erroneous dataset has to be studied. ...
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SellTrend: Inter-Attribute Visual Analysis of Temporal Transaction Data
Zhicheng Liu, John Stasko, Timothy Sullivan
Pages: 1025-1032
doi>10.1109/TVCG.2009.180
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We present a case study of our experience designing SellTrend, a visualization system for analyzing airline travel purchase requests. The relevant transaction data can be characterized as multi-variate temporal and categorical event sequences, and the ...
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Comparing Dot and Landscape Spatializations for Visual Memory Differences
Melanie Tory, Colin Swindells, Rebecca Dreezer
Pages: 1033-1040
doi>10.1109/TVCG.2009.127
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Spatialization displays use a geographic metaphor to arrange non-spatial data. For example, spatializations arecommonly applied to document collections so that document themes appear as geographic features such as hills. Many common spatialization interfaces ...
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Flow Mapping and Multivariate Visualization of Large Spatial Interaction Data
Diansheng Guo
Pages: 1041-1048
doi>10.1109/TVCG.2009.143
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Spatial interactions (or flows), such as population migration and disease spread, naturally form a weighted location-to-location network (graph). Such geographically embedded networks (graphs) are usually very large. For example, the county-to-county ...
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Temporal Summaries: Supporting Temporal Categorical Searching, Aggregation and Comparison
Taowei David Wang, Catherine Plaisant, Ben Shneiderman, Neil Spring, David Roseman, Greg Marchand, Vikramjit Mukherjee, Mark Smith
Pages: 1049-1056
doi>10.1109/TVCG.2009.187
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When analyzing thousands of event histories, analysts often want to see the events as an aggregate to detect insights and generate new hypotheses about the data.An analysis tool must emphasize both the prevalence and the temporal ordering of these events. ...
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ResultMaps: Visualization for Search Interfaces
Edward Clarkson, Krishna Desai, James Foley
Pages: 1057-1064
doi>10.1109/TVCG.2009.176
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Hierarchical representations are common in digital repositories, yet are not always fully leveraged in their onlinesearch interfaces. This work describes ResultMaps, which use hierarchical treemap representations with query string-driven digital library ...
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Lark: Coordinating Co-located Collaboration with Information Visualization
Matthew Tobiasz, Petra Isenberg, Sheelagh Carpendale
Pages: 1065-1072
doi>10.1109/TVCG.2009.162
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Large multi-touch displays are expanding the possibilities of multiple-coordinated views by allowing multiple people to interact with data in concert or independently. We present Lark, a system that facilitates the coordination of interactions with information ...
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The Benefits of Synchronous Collaborative Information Visualization: Evidence from an Experimental Evaluation
Sabrina Bresciani, Martin J. Eppler
Pages: 1073-1080
doi>10.1109/TVCG.2009.188
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A great corpus of studies reports empirical evidence of how information visualization supports comprehension and analysis of data. The benefits of visualization for synchronous group knowledge work, however, have not been addressed extensively.Anecdotal ...
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Harnessing the Information Ecosystem with Wiki-based Visualization Dashboards
Matt McKeon
Pages: 1081-1088
doi>10.1109/TVCG.2009.148
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We describe the design and deployment of Dashiki, a public website where users may collaboratively build visualization dashboards through a combination of a wiki-like syntax and interactive editors. Our goals are to extend existing research on social ...
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SpicyNodes: Radial Layout Authoring for the General Public
Michael Douma, Grzegorz Ligierko, Ovidiu Ancuta, Pavel Gritsai, Sean Liu
Pages: 1089-1096
doi>10.1109/TVCG.2009.183
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Trees and graphs are relevant to many online tasks such as visualizing social networks, product catalogs, educational portals, digital libraries, the semantic web, concept maps and personalized information management. SpicyNodes is an information-visualization ...
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code_swarm: A Design Study in Organic Software Visualization
Michael Ogawa, Kwan-Liu Ma
Pages: 1097-1104
doi>10.1109/TVCG.2009.123
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In May of 2008, we published online a series of software visualization videos using a method called code_swarm. Shortly thereafter, we made the code open source and its popularity took off. This paper is a study of our code swarm application, comprising ...
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Towards Utilizing GPUs in Information Visualization: A Model and Implementation of Image-Space Operations
Bryan McDonnel, Niklas Elmqvist
Pages: 1105-1112
doi>10.1109/TVCG.2009.191
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Modern programmable GPUs represent a vast potential in terms of performance and visual flexibility for information visualization research, but surprisingly few applications even begin to utilize this potential. In this paper, we conjecture that this ...
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A Multi-Threading Architecture to Support Interactive Visual Exploration
Harald Piringer, Christian Tominski, Philipp Muigg, Wolfgang Berger
Pages: 1113-1120
doi>10.1109/TVCG.2009.110
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During continuous user interaction, it is hard to provide rich visual feedback at interactive rates for datasets containing millions of entries. The contribution of this paper is a generic architecture that ensures responsiveness of the application even ...
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Protovis: A Graphical Toolkit for Visualization
Michael Bostock, Jeffrey Heer
Pages: 1121-1128
doi>10.1109/TVCG.2009.174
Full text available: Publisher SitePublisher Site

Despite myriad tools for visualizing data, there remains a gap between the notational efficiency of high-level visualization systems and the expressiveness and accessibility of low-level graphical systems. Powerful visualization systems may be inflexible ...
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Visual Analysis of Inter-Process Communication for Large-Scale Parallel Computing
Chris Muelder, Francois Gygi, Kwan-Liu Ma
Pages: 1129-1136
doi>10.1109/TVCG.2009.196
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In serial computation, program profiling is often helpful for optimization of key sections of code. When moving to parallel computation, not only does the code execution need to be considered but also communication between the different processes which ...
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Participatory Visualization with Wordle
Fernanda B. Viegas, Martin Wattenberg, Jonathan Feinberg
Pages: 1137-1144
doi>10.1109/TVCG.2009.171
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We discuss the design and usage of “Wordle,” a web-based tool for visualizing text. Wordle creates tag-cloud-like displays that give careful attention to typography, color, and composition. We describe the algorithms used to balance various ...
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Document Cards: A Top Trumps Visualization for Documents
Hendrik Strobelt, Daniela Oelke, Christian Rohrdantz, Andreas Stoffel, Daniel A. Keim, Oliver Deussen
Pages: 1145-1152
doi>10.1109/TVCG.2009.139
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Finding suitable, less space consuming views for a document’s main content is crucial to provide convenient access to large document collections on display devices of different size. We present a novel compact visualization which represents the ...
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Visualizing the Intellectual Structure with Paper-Reference Matrices
Jian Zhang, Chaomei Chen, Jiexun Li
Pages: 1153-1160
doi>10.1109/TVCG.2009.202
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Visualizing the intellectual structure of scientific domains using co-cited units such as references or authors has become a routine for domain analysis. In previous studies, paper-reference matrices are usually transformed into reference-reference matrices ...
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Exemplar-based Visualization of Large Document Corpus (InfoVis2009-1115)
Yanhua Chen, Lijun Wang, Ming Dong, Jing Hua
Pages: 1161-1168
doi>10.1109/TVCG.2009.140
Full text available: Publisher SitePublisher Site

With the rapid growth of the World Wide Web and electronic information services,text corpus is becoming available on-line at an incredible rate.By displaying text data in a logical layout (e.g., color graphs),text visualization presents a direct way ...
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Mapping Text with Phrase Nets
Frank van Ham, Martin Wattenberg, Fernanda B. Viegas
Pages: 1169-1176
doi>10.1109/TVCG.2009.165
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We present a new technique, the phrase net, for generating visual overviews of unstructured text. A phrase net displays a graph whose nodes are words and whose edges indicate that two words are linked by a user-specified relation. These relations may ...
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Loop surgery for volumetric meshes: Reeb graphs reduced to contour trees
Julien Tierny, Attila Gyulassy, Eddie Simon, Valerio Pascucci
Pages: 1177-1184
doi>10.1109/TVCG.2009.163
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This paper introduces an efficient algorithm for computing the Reeb graph of a scalar function f defined on a volumetric mesh M in R^3. We introduce a procedure called "loop surgery" that transforms M into a mesh M' by a sequence of cuts and guarantees ...
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Applying Manifold Learning to Plotting Approximate Contour Trees
Shigeo Takahashi, Issei Fujishiro, Masato Okada
Pages: 1185-1192
doi>10.1109/TVCG.2009.119
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A contour tree is a powerful tool for delineating the topological evolution of isosurfaces of a single-valued function, and thus has been frequently used as a means of extracting features from volumes and their time-varying behaviors.Several sophisticated ...
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Intrinsic Geometric Scale Space by Shape Diffusion
Guangyu Zou, Jing Hua, Zhaoqiang Lai, Xianfeng Gu, Ming Dong
Pages: 1193-1200
doi>10.1109/TVCG.2009.159
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This paper formalizes a novel, intrinsic geometric scale space (IGSS) of 3D surface shapes. The intrinsic geometry of a surface is diffused by means of the Ricci flow for the generation of a geometric scale space. We rigorously prove that this multiscale ...
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Multi-Scale Surface Descriptors
Gregory Cipriano, George N. Phillips Jr., Michael Gleicher
Pages: 1201-1208
doi>10.1109/TVCG.2009.168
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Local shape descriptors compactly characterize regions of a surface, and have been applied to tasks in visualization, shape matching, and analysis. Classically, curvature has be used as a shape descriptor; however, this differential property characterizes ...
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A User Study to Compare Four Uncertainty Visualization Methods for 1D and 2D Datasets
Jibonananda Sanyal, Song Zhang, Gargi Bhattacharya, Phil Amburn, Robert Moorhead
Pages: 1209-1218
doi>10.1109/TVCG.2009.114
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Many techniques have been proposed to show uncertainty in data visualizations.However, very little is known about their effectiveness in conveying meaningful information. In this paper, we present a user study that evaluates the perception of uncertainty ...
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Comparing 3D Vector Field Visualization Methods: A User Study
Andrew Forsberg, Jian Chen, David Laidlaw
Pages: 1219-1226
doi>10.1109/TVCG.2009.126
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In a user study comparing four visualization methods for three-dimensional vector data, participants used visualizations from each method to perform five simple but representative tasks: 1) determining whether a given point was a critical point, 2) determining ...
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Verifiable Visualization for Isosurface Extraction
Tiago Etiene, Carlos Scheidegger, Luis Gustavo Nonato, Robert Mike Kirby, Cláudio Silva
Pages: 1227-1234
doi>10.1109/TVCG.2009.194
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Visual representations of isosurfaces are ubiquitous in the scientific and engineering literature. In this paper, we present techniques to assess the behavior of isosurface extraction codes. Where applicable, these techniques allow us to distinguish ...
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Curve-Centric Volume Reformation for Comparative Visualization
Ove Daae Lampe, Carlos Correa, Kwan-Liu Ma, Helwig Hauser
Pages: 1235-1242
doi>10.1109/TVCG.2009.136
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We present two visualization techniques for curve-centric volume reformation with the aim to create compelling comparative visualizations. A curve-centric volume reformation deforms a volume, with regards to a curve in space, to create a new space in ...
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Predictor-Corrector Schemes for Visualization ofSmoothed Particle Hydrodynamics Data
Benjamin Schindler, Raphael Fuchs, John Biddiscombe, Ronald Peikert
Pages: 1243-1250
doi>10.1109/TVCG.2009.173
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In this paper we present a method for vortex core line extraction which operates directly on the smoothed particle hydrodynamics (SPH) representation and, by this, generates smoother and more (spatially and temporally) coherent results in an efficient ...
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Exploring the Millennium Run - Scalable Rendering of Large-Scale Cosmological Datasets
Roland Fraedrich, Jens Schneider, Rüdiger Westermann
Pages: 1251-1258
doi>10.1109/TVCG.2009.142
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In this paper we investigate scalability limitations in the visualization of large-scale particle-based cosmological simulations, and we present methods to reduce these limitations on current PC architectures. To minimize the amount of data to be streamed ...
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Interactive Streak Surface Visualization on the GPU
Kai Buerger, Florian Ferstl, Holger Theisel, Rüdiger Westermann
Pages: 1259-1266
doi>10.1109/TVCG.2009.154
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In this paper we present techniques for the visualization of unsteady flows using streak surfaces, which allow for the first time an adaptive integration and rendering of such surfaces in real-time. The techniques consist of two main components, which ...
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Time and Streak Surfaces for Flow Visualization in Large Time-Varying Data Sets
Hari Krishnan, Christoph Garth, Kenneth Joy
Pages: 1267-1274
doi>10.1109/TVCG.2009.190
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Time and streak surfaces are ideal tools to illustrate time-varying vector fields since they directly appeal to the intuition about coherently moving particles. However, efficient generation of high-quality time and streak surfaces for complex, large ...
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Hue-Preserving Color Blending
Johnson Chuang, Daniel Weiskopf, Torsten Moller
Pages: 1275-1282
doi>10.1109/TVCG.2009.150
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We propose a new perception-guided compositing operator for color blending. The operator maintains the same rules for achromatic compositing as standard operators (such as the over operator), but it modifies the computation of the chromatic channels. ...
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Perception-Based Transparency Optimization for Direct Volume Rendering
Ming-Yuen Chan, Yingcai Wu, Wai-Ho Mak, Wei Chen, Huamin Qu
Pages: 1283-1290
doi>10.1109/TVCG.2009.172
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The semi-transparent nature of direct volume rendered images is useful to depict layered structures in a volume. However, obtaining a semi-transparent result with the layers clearly revealed is difficult and may involve tedious adjustment on opacity ...
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A Physiologically-based Model for Simulation of Color Vision Deficiency
Gustavo M. Machado, Manuel M. Oliveira, Leandro A. F. Fernandes
Pages: 1291-1298
doi>10.1109/TVCG.2009.113
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Color vision deficiency (CVD) affects approximately 200 million people worldwide, compromising the ability of these individuals to effectively perform color and visualization-related tasks. This has a significant impact on their private and professional ...
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Depth-Dependent Halos: Illustrative Rendering of Dense Line Data
Maarten H. Everts, Henk Bekker, Jos B. T. M. Roerdink, Tobias Isenberg
Pages: 1299-1306
doi>10.1109/TVCG.2009.138
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We present a technique for the illustrative rendering of 3D line data at interactive frame rates. We create depth-dependent halos around lines to emphasize tight line bundles while less structured lines are de-emphasized. Moreover, the depth-dependent ...
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Markerless View-Independent Registration of Multiple Distorted Projectors on Extruded Surfaces Using an Uncalibrated Camera
Behzad Sajadi, Aditi Majumder
Pages: 1307-1316
doi>10.1109/TVCG.2009.166
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In this paper, we present the first algorithm to geometrically register multiple projectors in a view-independent manner (i.e. wallpapered) on a common type of curved surface, vertically extruded surface, using an uncalibrated camera without attaching ...
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Color Seamlessness in Multi-Projector Displays Using Constrained Gamut Morphing
Behzad Sajadi, Maxim Lazarov, M. Gopi, Aditi Majumder
Pages: 1317-1326
doi>10.1109/TVCG.2009.124
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Multi-projector displays show significant spatial variation in 3D color gamut due to variation in the chromaticity gamuts across the projectors, vignetting effect of each projector and also overlap across adjacent projectors. In this paper we present ...
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Visual Human+Machine Learning
Raphael Fuchs, Jürgen Waser, Meister Eduard Groller
Pages: 1327-1334
doi>10.1109/TVCG.2009.199
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In this paper we describe a novel method to integrate interactive visual analysis and machine learning to support the insight generation of the user. The suggested approach combines the vast search and processing power of the computer with the superior ...
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Interactive Visual Optimization and Analysis for RFID Benchmarking
Yingcai Wu, Ka-Kei Chung, Huamin Qu, Xiaoru Yuan, S. C. Cheung
Pages: 1335-1342
doi>10.1109/TVCG.2009.156
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Radio frequency identification (RFID) is a powerful automatic remote identification technique that has wide applications. To facilitate RFID deployment, an RFID benchmarking instrument called aGate has been invented to identify the strengths and weaknesses ...
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A Visual Approach to Efficient Analysis and Quantification of Ductile Iron and Reinforced Sprayed Concrete
Laura Fritz, Markus Hadwiger, Georg Geier, Gerhard Pittino, M. Eduard Groller
Pages: 1343-1350
doi>10.1109/TVCG.2009.115
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This paper describes advanced volume visualization and quantification for applications in non-destructive testing (NDT), which results in novel and highly effective interactive workflows for NDT practitioners. We employ a visual approach to explore and ...
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Interactive Visual Analysis of Complex Scientific Data as Families of Data Surfaces
Kresimir Matkovic, Denis Gracanin, Borislav Klarin, Helwig Hauser
Pages: 1351-1358
doi>10.1109/TVCG.2009.155
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The widespread use of computational simulation in science and engineering provides challenging research opportunities. Multiple independent variables are considered and large and complex data are computed, especially in the case of multi-run simulation. ...
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Visualization and Exploration of Temporal Trend Relationships in Multivariate Time-Varying Data
Teng-Yok Lee, Han-Wei Shen
Pages: 1359-1366
doi>10.1109/TVCG.2009.200
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We present a new algorithm to explore and visualize multivariate time-varying data sets. We identify important trend relationships among the variables based on how the values of the variables change over time and how those changes are related to each ...
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Isosurface Extraction and View-Dependent Filtering from Time-Varying Fields Using Persistent Time-Octree (PTOT)
Cong Wang, Yi-Jen Chiang
Pages: 1367-1374
doi>10.1109/TVCG.2009.160
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We develop a new algorithm for isosurface extraction andview-dependent filtering from large time-varying fields, by using anovel Persistent Time-Octree (PTOT) indexingstructure. Previously, the Persistent Octree (POT) was proposed toperform isosurface ...
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Visual Exploration of Climate Variability Changes Using Wavelet Analysis
Heike Janicke, Michael Bottinger, Uwe Mikolajewicz, Gerik Scheuermann
Pages: 1375-1382
doi>10.1109/TVCG.2009.197
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Due to its nonlinear nature, the climate system shows quite high natural variability on different time scales, including multiyear oscillations such as the El Ni˜no Southern Oscillation phenomenon. Beside a shift of the mean states and of extreme ...
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Interactive Coordinated Multiple-View Visualization of Biomechanical Motion Data
Daniel Keefe, Marcus Ewert, William Ribarsky, Remco Chang
Pages: 1383-1390
doi>10.1109/TVCG.2009.152
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We present an interactive framework for exploring space-time and form-function relationships in experimentally collected high-resolution biomechanical data sets. These data describe complex 3D motions (e.g. chewing, walking, flying) performed by animals ...
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Interactive Visualization of Molecular Surface Dynamics
Michael Krone, Katrin Bidmon, Thomas Ertl
Pages: 1391-1398
doi>10.1109/TVCG.2009.157
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Molecular dynamics simulations of proteins play a growing role in various fields such as pharmaceutical, biochemical and medical research. Accordingly, the need for high quality visualization of these protein systems raises. Highly interactive visualization ...
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Stress Tensor Field Visualization for Implant Planning in Orthopedics
Christian Dick, Joachim Georgii, Rainer Burgkart, Rüdiger Westermann
Pages: 1399-1406
doi>10.1109/TVCG.2009.184
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We demonstrate the application of advanced 3D visualization techniques to determine the optimal implant design and position in hip joint replacement planning. Our methods take as input the physiological stress distribution inside a patient's bone under ...
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Visual Exploration of Nasal Airflow
Stefan Zachow, Philipp Muigg, Thomas Hildebrandt, Helmut Doleisch, Hans-Christian Hege
Pages: 1407-1414
doi>10.1109/TVCG.2009.198
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Rhinologists are often faced with the challenge of assessing nasal breathing from a functional point of view to derive effective therapeutic interventions. While the complex nasal anatomy can be revealed by visual inspection and medical imaging, only ...
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Sampling and Visualizing Creases with Scale-Space Particles
Gordon L. Kindlmann, Raúl San José Estepar, Stephen M. Smith, Carl-Fredrik Westin
Pages: 1415-1424
doi>10.1109/TVCG.2009.177
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Particle systems have gained importance as a methodology for sampling implicit surfaces and segmented objects to improve mesh generation and shape analysis. We propose that particle systems have a significantly more general role in sampling structure ...
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Volume Illustration of Muscle from Diffusion Tensor Images
Wei Chen, Zhicheng Yan, Song Zhang, John Allen Crow, David S. Ebert, Ronald M. McLaughlin, Katie B. Mullins, Robert Cooper, Zi'ang Ding, Jun Liao
Pages: 1425-1432
doi>10.1109/TVCG.2009.203
Full text available: Publisher SitePublisher Site

Medical illustration has demonstrated its effectiveness to depict salient anatomical features while hiding the irrelevant details. Current solutions are ineffective for visualizing fibrous structures such as muscle, because typical datasets (CT or MRI) ...
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A Novel Interface for Interactive Exploration of DTI Fibers
Wei Chen, Zi'ang Ding, Song Zhang, Anna MacKay-Brandt, Stephen Correia, Huamin Qu, John Allen Crow, David F. Tate, Zhicheng Yan, Qunsheng Peng
Pages: 1433-1440
doi>10.1109/TVCG.2009.112
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Visual exploration is essential to the visualization and analysis of densely sampled 3D DTI fibers in biological speciments, due to the high geometric, spatial, and anatomical complexity of fiber tracts. Previous methods for DTI fiber visualization use ...
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Parameter Sensitivity Visualization for DTI Fiber Tracking
Ralph Brecheisen, Anna Vilanova, Bram Platel, Bart ter Haar Romeny
Pages: 1441-1448
doi>10.1109/TVCG.2009.170
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Fiber tracking of Diffusion Tensor Imaging (DTI) data offers a unique insight into the three-dimensional organisation of white matter structures in the living brain. However, fiber tracking algorithms require a number of user-defined input parameters ...
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Exploring 3D DTI Fiber Tracts with Linked 2D Representations
Radu Jianu, Cagatay Demiralp, David Laidlaw
Pages: 1449-1456
doi>10.1109/TVCG.2009.141
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We present a visual exploration paradigm that facilitates navigation through complex fiber tracts by combining traditional 3D model viewing with lower dimensional representations. To this end, we create standard streamtube models along with two twodimensional ...
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Coloring 3D Line Fields Using Boy’s Real Projective Plane Immersion
Çağatay Demiralp, John F. Hughes, David H. Laidlaw
Pages: 1457-1464
doi>10.1109/TVCG.2009.125
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We introduce a new method for coloring 3D line fields and show results from its application in visualizing orientation in DTI brain data sets. The method uses Boy’s surface, an immersion of RP2 in 3D. This coloring method is smooth and one-to-one ...
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The Occlusion Spectrum for Volume Classification and Visualization
Carlos Correa, Kwan-Liu Ma
Pages: 1465-1472
doi>10.1109/TVCG.2009.189
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Despite the ever-growing improvements on graphics processing units and computational power, classifying 3D volume data remains a challenge.In this paper, we present a new method for classifying volume data based on the ambient occlusion of voxels. This ...
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Structuring Feature Space: A Non-Parametric Method for Volumetric Transfer Function Generation
Ross Maciejewski, Insoo Woo, Wei Chen, David Ebert
Pages: 1473-1480
doi>10.1109/TVCG.2009.185
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The use of multi-dimensional transfer functions for direct volume rendering has been shown to be an effective means of extracting materials and their boundaries for both scalar and multivariate data. The most common multi-dimensional transfer function ...
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Automatic Transfer Function Generation Using Contour Tree Controlled Residue Flow Model and Color Harmonics
Jianlong Zhou, Masahiro Takatsuka
Pages: 1481-1488
doi>10.1109/TVCG.2009.120
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Transfer functions facilitate the volumetric data visualization by assigning optical properties to various data features and scalar values. Automation of transfer function specifications still remains a challenge in volume rendering. This paper presents ...
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An interactive visualization tool for multi-channel confocal microscopy data in neurobiology research
Yong Wan, Hideo Otsuna, Chi-Bin Chien, Charles Hansen
Pages: 1489-1496
doi>10.1109/TVCG.2009.118
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Confocal microscopy is widely used in neurobiology for studying the three-dimensional structure of the nervous system. Confocal image data are often multi-channel, with each channel resulting from a different fluorescent dye or fluorescent protein; one ...
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BrainGazer - Visual Queries for Neurobiology Research
Stefan Bruckner, Veronika Šolteszova, Eduard Groller, Jiří Hladůvka, Katja Buhler, Jai Y. Yu, Barry J. Dickson
Pages: 1497-1504
doi>10.1109/TVCG.2009.121
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Neurobiology investigates how anatomical and physiological relationships in the nervous system mediate behavior. Molecular genetic techniques, applied to species such as the common fruit fly Drosophila melanogaster, have proven to be an important tool ...
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Scalable and Interactive Segmentation and Visualization of Neural Processes in EM Datasets
Won-Ki Jeong, Johanna Beyer, Markus Hadwiger, Amelio Vazquez, Hanspeter Pfister, Ross T. Whitaker
Pages: 1505-1514
doi>10.1109/TVCG.2009.178
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Recent advances in scanning technology provide high resolution EM (Electron Microscopy) datasets that allow neuro-scientists to reconstruct complex neural connections in a nervous system. However, due to the enormous size and complexity of the resulting ...
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Multimodal Vessel Visualization of Mouse Aorta PET/CT Scans
Timo Ropinski, Sven Hermann, Rainer Reich, Michael Schafers, Klaus Hinrichs
Pages: 1515-1522
doi>10.1109/TVCG.2009.169
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In this paper, we present a visualization system for the visual analysis of PET/CT scans of aor tic arches of mice. The system has been designed in close collaboration between researchers from the areas of visualization and molecular imaging with the ...
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Quantitative Texton Sequences for Legible Bivariate Maps
Colin Ware
Pages: 1523-1530
doi>10.1109/TVCG.2009.175
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Representing bivariate scalar maps is a common but difficult visualization problem.One solution has been to use two dimensional color schemes, but the results are often hard to interpret and inaccurately read.An alternative is to use a color sequence ...
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Continuous Parallel Coordinates
Julian Heinrich, Daniel Weiskopf
Pages: 1531-1538
doi>10.1109/TVCG.2009.131
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Typical scientific data is represented on a grid with appropriate interpolation or approximation schemes,defined on a continuous domain. The visualization of such data in parallel coordinates may reveal patterns latently contained in the data and thus ...
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VisMashup: Streamlining the Creation of Custom Visualization Applications
Emanuele Santos, Lauro Lins, James Ahrens, Juliana Freire, Claudio Silva
Pages: 1539-1546
doi>10.1109/TVCG.2009.195
Full text available: Publisher SitePublisher Site

Visualization is essential for understanding the increasing volumes of digital data. However, the process required to create insightful visualizations is involved and time consuming. Although several visualization tools are available, including tools ...
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Focus+Context Route Zooming and Information Overlay in 3D Urban Environments
Huamin Qu, Haomian Wang, Weiwei Cui, Yingcai Wu, Ming-Yuen Chan
Pages: 1547-1554
doi>10.1109/TVCG.2009.144
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In this paper we present a novel focus+context zooming technique, which allows users to zoom into a route and its associated landmarks in a 3D urban environment from a 45-degree bird’s-eye view. Through the creative utilization of the empty space ...
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Kd-Jump: a Path-Preserving Stackless Traversal for Faster Isosurface Raytracing on GPUs
David M. Hughes, Ik Soo Lim
Pages: 1555-1562
doi>10.1109/TVCG.2009.161
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Stackless traversal techniques are often used to circumvent memory bottlenecks by avoiding a stack and replacing return traversal with extra computation. This paper addresses whether the stackless traversal approaches are useful on newer hardware and ...
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Mapping High-Fidelity Volume Rendering for Medical Imaging to CPU, GPU and Many-Core Architectures
Mikhail Smelyanskiy, David Holmes, Jatin Chhugani, Alan Larson, Douglas M. Carmean, Dennis Hanson, Pradeep Dubey, Kurt Augustine, Daehyun Kim, Alan Kyker, Victor W. Lee, Anthony D. Nguyen, Larry Seiler, Richard Robb
Pages: 1563-1570
doi>10.1109/TVCG.2009.164
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Medical volumetric imaging requires high fidelity, high performance rendering algorithms. We motivate and analyze new volumetric rendering algorithms that are suited to modern parallel processing architectures. First, we describe the three major categories ...
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Volume Ray Casting with Peak Finding and Differential Sampling
Aaron Knoll, Younis Hijazi, Rolf Westerteiger, Mathias Schott, Charles Hansen, Hans Hagen
Pages: 1571-1578
doi>10.1109/TVCG.2009.204
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Direct volume rendering and isosurfacing are ubiquitous rendering techniques in scientific visualization, commonly employed in imaging 3D data from simulation and scan sources. Conventionally, these methods have been treated as separate modalities, necessitating ...
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Interactive Volume Rendering of Functional Representations in Quantum Chemistry
Yun Jang, Ugo Varetto
Pages: 1579-5186
doi>10.1109/TVCG.2009.158
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Simulation and computation in chemistry studies have been improved as computational power has increased over decades. Many types of chemistry simulation results are available, from atomic level bonding to volumetric representations of electron density. ...
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GL4D: A GPU-based Architecture for Interactive 4D Visualization
Alan Chu, Chi-Wing Fu, Andrew Hanson, Pheng-Ann Heng
Pages: 1587-1594
doi>10.1109/TVCG.2009.147
Full text available: Publisher SitePublisher Site

This paper describes GL4D, an interactive system for visualizing 2-manifolds and 3-manifolds embedded in four Euclidean dimensions and illuminated by 4D light sources.It is a tetrahedron-based rendering pipeline that projects geometry into volume images, ...
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Decoupling Illumination from Isosurface Generation Using 4D Light Transport
David C. Banks, Kevin Beason
Pages: 1595-1602
doi>10.1109/TVCG.2009.137
Full text available: Publisher SitePublisher Site

One way to provide global illumination for the scientist who performs an interactive sweep through a 3D scalar dataset is to pre-compute global illumination, resample the radiance onto a 3D grid, then use it as a 3D texture. The basic approach of repeatedly ...
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Supercubes: A High-Level Primitive for Diamond Hierarchies
Kenneth Weiss, Leila De Floriani
Pages: 1603-1610
doi>10.1109/TVCG.2009.186
Full text available: Publisher SitePublisher Site

Volumetric datasets are often modeled using a multiresolution approach based on a nested decomposition of the domain into a polyhedral mesh.Nested tetrahedral meshes generated through the longest edge bisection rule are commonly used to decompose regular ...
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High-Quality, Semi-Analytical Volume Rendering for AMR Data
Pages: 1611-1618
doi>10.1109/TVCG.2009.149
Full text available: Publisher SitePublisher Site

This paper presents a pipeline for high quality volume rendering of adaptive mesh refinement (AMR) datasets. We introduce a new method allowing high quality visualization of hexahedral cells in this context; this method avoids artifacts like discontinuities ...
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TVCG Vis/InfoVis 2009 Author Index
Pages: xxviv-xxvv
doi>10.1109/TVCG.2009.192
Full text available: Publisher SitePublisher Site

TVCG Vis/InfoVis 2009 Author Index
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