IVAPP 2012 Abstracts


Full Papers
Paper Nr: 4
Title:

SPACE-TIME VISUALIZATION OF DYNAMICS IN LAGRANGIAN COHERENT STRUCTURES OF TIME-DEPENDENT 2D VECTOR FIELDS

Authors:

Sven Bachthaler, Filip Sadlo, Carsten Dachsbacher and Daniel Weiskopf

Abstract: Lagrangian coherent structures (LCS), apparent as ridges in the finite-time Lyapunov exponent (FTLE) field, represent a time-dependent alternative to the concept of separatrices in vector field topology. Traditionally, LCS are analyzed and visualized in terms of their geometric shape only, neglecting stretching and compression in tangent directions. These effects are, however, of particular interest in mixing phenomena and turbulence. Hyperbolicity plays an important role in these processes and gives rise to hyperbolic trajectories originating at the intersections of forward and reverse LCS. Since integration of hyperbolic trajectories is difficult, we propose to visualize the corresponding space-time intersection curves of LCS instead. By stacking the traditional 2D FTLE video frames of time-dependent vector fields, a space-time FTLE field is obtained. In this field, ridge lines turn into ridge surfaces representing LCS, and their intersection forms curves that are a robust alternative to hyperbolic trajectories. Additionally, we use a space-time representation of the time-dependent vector field, leading to a steady 3D space-time vector field. In this field, the LCS become stream surfaces given that their advection property is sufficiently met. This makes visualization of the dynamics within LCS amenable to line integral convolution (LIC), conveying in particular the dynamics around hyperbolic trajectories. To avoid occlusion, the LCS can be constrained to space-time bands around the intersection curves, resembling visualization by saddle connectors. We evaluate our approach using synthetic, simulated, and measured vector fields.

Paper Nr: 6
Title:

CHANGE VISUALIZATIONS IN BUSINESS PROCESSES - Requirements Analysis

Authors:

Simone Kriglstein and Stefanie Rinderle-Ma

Abstract: Many business processes are highly dynamic, because process changes result from unplanned events and exceptions which are unforeseen (e.g., demands of customers have changed, new legislature or design errors are detected). The management of the large collections of the different process model versions which evolve over time requires visualization approaches. Visualizations of changes between different process versions are often essential, because processes in combination with change information can become very complex. In this paper we discuss visualization requirements for process changes with the focus to support users to understand changes more easily. The requirements analysis is based on insights which we gained from: (1) literature review to get an overview about different characteristics of changes in process as well as existing visualization approaches and (2) a user survey to identify users’ experiences and expectations in this field. With the proposed requirements we want to support researchers to identify directions for further work in regard to process change visualization.

Paper Nr: 10
Title:

EVALUATION OF A BUNDLING TECHNIQUE FOR PARALLEL COORDINATES

Authors:

Julian Heinrich, Yuan Luo, Arthur E. Kirkpatrick and Daniel Weiskopf

Abstract: We present a controlled user study evaluating the effectiveness of bundled curve representations in parallel coordinates plots. Replacing the traditional C0 polygonal lines by C1 continuous piecewise Bézier curves makes it easier to visually trace data points through each coordinate axis. The resulting B´ezier curves can then be bundled to visualize data with given cluster structures. Our results show that: 1) compared to polygonal lines, bundled curves are equally capable of revealing correlations between neighboring data attributes; 2) the geometric cues of bundles can be effective in displaying cluster information.

Paper Nr: 16
Title:

RADIAL EDGE SPLATTING FOR VISUALIZING DYNAMIC DIRECTED GRAPHS

Authors:

Michael Burch, Fabian Beck and Daniel Weiskopf

Abstract: We describe and discuss a novel radial version of a scalable dynamic graph visualization. The radial layout encodes dynamic directed graphs on narrow rings of a circle. The temporal evolution of the graph is mapped to rings that grow outward from the center of the circle. Graph vertices are placed equidistantly at the borderlines of each ring. Graph edges are displayed as curved lines starting from a source on the inner borderline of the ring and pointing to a target on the outer borderline. To better perceive link directions and structures of large datasets, visual clutter is reduced by exploiting an edge splatting approach that generates density fields of the displayed edges. The radial layout emphasizes newer graphs, displayed in the larger, outer parts of the circle. As a benefit, edge lengths are reduced in comparison to the non-radial visualization. Moreover, the radial layout guarantees the symmetry of the visualization under shifting of vertices. We illustrate the usefulness of the diagrams by applying them to call graph data of the open source software project Cobertura.

Paper Nr: 21
Title:

COMPARATIVE VISUALIZATION OF GEOSPATIAL-TEMPORAL DATA

Authors:

Stefan Jänicke, Christian Heine, Ralf Stockmann and Gerik Scheuermann

Abstract: The amount of online data annotated with geospatial and temporal metadata has grown rapidly in the recent years. Social networks like Flickr and Twitter are popular providers of masses of such data, but are hard to browse. Many systems exist that can show the data’s geospatial distribution in a map widget and their temporal distribution in a time widget, allowing these widgets to become dynamic-query-like filters for data. We present a web application that combines several existing approaches and supports comparison of multiple, potentially large result sets of textual queries in a geospatial and temporal context with extended interaction capabilities. We validate our approach with several case studies and our tool’s learnability in a field experiment.

Paper Nr: 22
Title:

SCAFFOLD HUNTER - Visual Analysis of Chemical Compound Databases

Authors:

Karsten Klein, Nils Kriege and Petra Mutzel

Abstract: We describe Scaffold Hunter, an interactive software tool for the exploration and analysis of chemical compound databases. Scaffold Hunter allows to explore the chemical space spanned by a compound database, fosters intuitive recognition of complex structural and bioactivity relationships, and helps to identify interesting compound classes with a desired bioactivity. Thus, the tool supports chemists during the complex and time-consuming drug discovery process to gain additional knowledge and to focus on regions of interest, facilitating the search for promising drug candidates.

Paper Nr: 25
Title:

INTERPRETATION, INTERACTION, AND SCALABILITY FOR STRUCTURAL DECOMPOSITION TREES

Authors:

René Rosenbaum, Daniel Engel, James Mouradian, Hans Hagen and Bernd Hamann

Abstract: Structural Decomposition Trees (SDTs) have been proposed as a completely novel display approach to tackling the research problem of visualizing high-dimensional data. SDTs merge the two distinct classes of relation and value visualizations into a single integrated strategy. The method is promising; however, statements regarding its meaningful application are still missing, constraining its broad adoption. This paper introduces solutions for still-existing issues in the application of SDTs with regard to interpretation, interaction, and scalability. SDTs provide a well-designed initial projection of the data to meaningfully represent its properties, but not much is known about how to interpret this projection. We are able to derive the data’s properties from their initial representation. The provided methods are valid not only for SDTs, but also for projections based on principal components analysis, addressing a frequent problem when applying this technology. We further show how interactive exploration based on SDTs can be applied to visual cluster analysis as one of its application domains. To address the urgent need to analyze vast and complex amounts of data, we also introduce means for scalable processing and representation. Given the importance and broader relevance of the discussed problem domains, this paper justifies and further motivates the usefulness and wide applicability of SDTs as a novel visualization approach for high-dimensional data.

Paper Nr: 29
Title:

INTERACTIVE VISUAL ANALYSIS OF INTENSIVE CARE UNIT DATA - Relationship between Serum Sodium Concentration, its Rate of Change and Survival Outcome

Authors:

Krešimir Matković, Heng Gan, Andreas Ammer, David Bennett, Werner Purgathofer and Marius Terblanche

Abstract: In this paper we present a case study of interactive visual analysis and exploration of a large ICU data set. The data consists of patients’ records containing scalar data representing various patients’ parameters (e.g. gender, age, weight), and time series data describing logged parameters over time (e.g. heart rate, blood pressure). Due to the size and complexity of the data, coupled with limited time and resources, such ICU data is often not utilized to its full potential, although its analysis could contribute to a better understanding of physiological, pathological and therapeutic processes, and consequently lead to an improvement of medical care. During the exploration of this data we identified several analysis tasks and adapted and improved a coordinated multiple views system accordingly. Besides a curve view which also supports time series with gaps, we introduced a summary view which allows an easy comparison of subsets of the data and a box plot view in a coordinated multiple views setup. Furthermore, we introduced an inverse brush, a secondary brush which automatically selects non-brushed items, and updates itself accordingly when the original brush is modified. The case study describes how we used the system to analyze data from 1447 patients from the ICU at Guy’s & St. Thomas’ NHS Foundation Trust in London. We were interested in the relationship between serum sodium concentration, its rate of change and their effect on ICU mortality rates. The interactive visual analysis led us to findings which were fascinating for medical experts, and which would be very difficult to discover using conventional analysis methods usually applied in the medical field. The overall feedback from domain experts (coauthors of the paper) is very positive.

Paper Nr: 37
Title:

ISOSURFACE EXTRACTION FROM HYBRID UNSTRUCTURED GRIDS CONTAINING PENTAHEDRAL ELEMENTS

Authors:

Akshay Narayan, Jaya Sreevalsan-Nair, Kelly Gaither and Bernd Hamann

Abstract: Grid-based computational simulations often use hybrid unstructured grids consisting of various types of elements. Most commonly used elements are tetrahedral, pentahedral (namely, square pyramids and right triangular prisms) and hexahedral elements. Extracting isosurfaces of scalar fields defined on such hybrid unstructured grids is often done using indirect methods, such as, (a) subdividing all non-tetrahedral cells into tetrahedra and computing the triangulated isosurfaces using the marching tetrahedra algorithm, or (b) triangulating intersection points of edges of cells and computing the isosurface using a standard triangulation algorithm. Using the basic ideas underlying the well-established marching cubes and marching tetrahedra algorithms, which are applied to hexahedral and tetrahedral elements, respectively, we generate look-up tables for extracting isosurfaces directly from pentahedral elements. By using appropriate look-up tables, it is possible to process nearly all types of hybrid unstructured grids used in practical applications without the need for indirect methods. We construct look-up tables for square pyramidal and triangular prismatic cells with accurate topological considerations.

Paper Nr: 40
Title:

GLYPH- AND TEXTURE-BASED VISUALIZATION OF SEGMENTED TENSOR FIELDS

Authors:

Cornelia Auer, Claudia Stripf, Andrea Kratz and Ingrid Hotz

Abstract: In this work we show how the variability of visualization methods like textures and glyphs can be used to enhance established methods like topology. A topology-based segmentation (Auer et al., 2011) serves as framework to map textures and place glyph exponents for two dimensional symmetric tensor fields. The textures encode physical properties of the underlying field and support the understanding of the field as a whole, whereas the glyph exponents can be used to give detailed insight at distinctive locations.

Paper Nr: 48
Title:

VISUALISING SMALL WORLD GRAPHS - Agglomerative Clustering of Small World Graphs around Nodes of Interest

Authors:

Fintan McGee and John Dingliana

Abstract: Many graphs which model real-world systems are characterised by a high edge density and the small world properties of a low diameter and a high clustering coefficient. In the ”small world” class of graphs, the connectivity of nodes follows a power-law distribution with some nodes of high degree acting as hubs. While current layout algorithms are capable of displaying two dimensional node-link visualisations of large data sets, the results for dense small world graphs can be aesthetically unpleasant and difficult to read, due to the high level of clutter caused by graph edges. We propose an agglomerative clustering which allows the user to select nodes of interest to form the basis of clusters, using a heuristic to determine which cluster each node belongs to. We have tested three heuristics, based on existing graph metrics, on small world graphs of varying size and density. Our results indicate that maximising the average cluster clustering coefficient produces clusters that score well on modularity while consisting of a set of strongly related nodes. We also provide a comparison between our clustering coefficient heuristic agglomerative approach and Newman and Girvan’s top-down Edge Betweenness Centrality clustering algorithm.

Paper Nr: 51
Title:

A LAYOUT ALGORITHM FOR THE VISUALIZATION OF MULTIPLE RELATIONS IN GRAPHS

Authors:

Géraldine Bous

Abstract: Many recent applications involve data models that rely on heterogeneous graphs (multiple node and relation types). Drawing these graphs is more difficult than drawing standard graphs, as it is desirable to take into account the heterogeneity of graphs in the form of constraints, possibly stemming from user preferences, to compute the layout. In this paper we propose a method for hierarchical graph drawing that is based on structural constraint modeling. These constraints are combined with crossing minimization algorithms to yield the desired visual effect. Three types of constraints are considered and illustrated, giving special attention to the drawing of multiple relations for interactive graph visualization.

Short Papers
Paper Nr: 11
Title:

VINCENT - Visualization of Network Centralities

Authors:

Andreas Kerren, Harald Köstinger and Björn Zimmer

Abstract: The use of network centralities in the field of network analysis plays an important role when the relative importance of nodes within the network topology should be rated. A single network can easily be represented by the use of standard graph drawing algorithms, but not only the exploration of one centrality might be important: the comparison of two or more of them is often crucial for a better understanding. When visualizing the comparison of several network centralities, we are facing new problems of how to show them in a meaningful way. For instance, we want to be able to track all the changes of centralities in the networks as well as to display the single networks as best as possible. In the life sciences, centrality measures help scientists to understand the underlying biological processes and have been successfully applied to different biological networks. The aim of this paper is to present a novel system for the interactive visualization of biochemical networks and its centralities. Researchers can focus on the exploration of the centrality values including the network structure without dealing with visual clutter or occlusions of nodes. Simultaneously, filtering based on statistical data concerning the network elements and centrality values supports this.

Paper Nr: 12
Title:

PARALLEL R-CENTIPEDES - Fast Contour Extraction for 3D Visualization

Authors:

Mehdi Nouri Shirazi and Yoshiyuki Kamakura

Abstract: In our previous article, we introduced a class of region-based deformable contour models called R-centipedes. The R-centipedes are able to operate in three modes: 1) deflationary, 2) inflationary, or 3) a mixture of both. We demonstrated that the deflationary R-centipedes could adaptively change their structures in order to extract structures of interest and their substructures from complex Electron Microscope (EM) tomography slice images. The R-centipedes have several desirable features such as 1) structural flexibility which allows them to extract multiple objects in a single slice image, 2) high accuracy, and 3) insensitivity with respect to their initial positions and configurations. In this article, we introduce two parallel versions of the R-centipedes, 1) implicit, and 2) explicit parallel R-centipedes. We present three simulation studies to demonstrate their flexibility, effectiveness and computational efficiency in extracting structures in three different complex situations.

Paper Nr: 34
Title:

PHOTOREALISTIC RENDERING OF SCIENTIFIC DATA

Authors:

Joel Ogden, Jabari Jordan, Chelsey Krol, Tanya Papazian, Hans-Peter Bischof and Reynold Bailey

Abstract: Generating photorealistic images of astrophysical simulations can enhance the experience of watching galactic visualizations for both the specialists who study the data and the average person who is simply interested in outer space. Unfortunately, the astrophysicist who is creating the simulations typically lacks the expertise required to generate photorealistic images. Likewise, a 3D artist may be unaware of the physics behind certain astrophysical events. We aim to use Spiegel, a user interface that controls the rendering of astrophysical data and Maya, a high end 3D animation program, to allow a non-artist to easily create renders of photorealistic images. Spiegel provides a user-friendly interface for controlling the creation of potentially complex rendering applications by individuals with little experience in computer programming. Since Spiegel’s basic visualization capabilities are limited to simple primitives like points and lines, it was necessary to develop an additional program for Spiegel to interface with Maya’s 3D rendering capabilities. This software interface is called Miegel. Using Miegel, the astrophysicist now has access to Maya’s 3D rendering capabilities allowing them to create stunning visualizations of astrophysical phenomena. In addition, new artistic effects can be created with Maya in the form of presets, which can be integrated into the user’s visualization with minimal knowledge of computer programming.

Paper Nr: 41
Title:

A COMPUTATIONAL FRAMEWORK FOR NEXT-GENERATION BRIDGE IMAGING AND INSPECTION

Authors:

David Lattanzi and Greg Miller

Abstract: A modern framework for bridge monitoring is proposed. It is intended to, in effect, bring bridges virtually into engineers’ offices, enabling computer-assisted inspection using visual/spatial navigation and interaction, augmented with computer vision recognition and analysis techniques developed for flaw and damage detection. The technical challenges to be addressed include developing a robotic front-end image capture approach for optimum compatibility with the bridge inspection process, building scalable back-end visualization algorithms, implementing a computer vision system capable of robust field inspection, and leveraging the contextualized image data to improve decision making tools for bridge maintenance.

Paper Nr: 43
Title:

CONSTRUCTING VISUALIZATIONS WITH INFOVIS TOOLS - An Evaluation from a User Perspective

Authors:

Kostas Pantazos and Soren Lauesen

Abstract: Several information visualization toolkits and tools have been developed to facilitate users work. However, evaluation studies for these toolkits and tools from a user perspective have been overlooked. In this paper, we evaluate 13 information visualization toolkits and tools developed in the last 10 years from a user perspective. For each user type (novice, savvy and expert), we investigated the toolkits and tools using 5 dimensions. This study shows that tools for savvy users—users with basic programming skills and domain knowledge—are lacking, and these users should be supported with more tools to construct advanced visualizations. We outline our approach to how savvy users can be engaged more in the development process and construct advanced visualizations. Information visualization community should focus more on moving the boundary of constructing advanced visualizations from expert users towards savvy users.

Paper Nr: 44
Title:

EVALUATING COMPONENT ARCHITECTURE VISUALIZATION TOOLS - Criteria and Case Study

Authors:

Lukas Holy, Jaroslav Snajberk and Premek Brada

Abstract: There are many software architecture modeling tools and their use is very common in practice. But a closer look reveals that in the ever more important area of component-based architectures, system architects or component assemblers are constrained by the lack of good model representations. On one hand, a generic representation like UML provides insufficient support for component-specific needs, on the other hand, tools focused on component development sometimes force the user to learn new visual syntax specific for the component model. Advanced features offered by the tools on top of basic architecture visualization are often limited. In this paper we propose a set of criteria for the evaluation of tools for component architecture visualization, considering the needs of both architectural modeling and analytical tasks. These criteria are thoroughly discussed and their use is shown on a case study which evaluates a current state of the art tool.

Paper Nr: 59
Title:

VELOCITY VECTOR FIELD VISUALIZATION OF FLOW IN LIQUID ACQUISITION DEVICE CHANNEL

Authors:

John B. McQuillen, David F. Chao, Nancy R. Hall and Nengli Zhang

Abstract: A capillary flow liquid acquisition device (LAD) for cryogenic propellants has been developed and tested in NASA Glenn Research Center to meet the requirements of transferring cryogenic liquid propellants from storage tanks to an engine in reduced gravity environments. The prototypical mesh screen channel LAD was fabricated with a mesh screen, covering a rectangular flow channel with a cylindrical outlet tube, and was tested with liquid oxygen (LOX). In order to better understand the performance in various gravity environments and orientations at different liquid submersion depths of the screen channel LAD, a series of computational fluid dynamics (CFD) simulations of LOX flow through the LAD screen channel was undertaken. The resulting velocity vector field visualization for the flow in the channel has been used to reveal the gravity effects on the flow in the screen channel.

Posters
Paper Nr: 9
Title:

ISO-SURFACE RENDERING BASED UNCERTAINTY VISUALIZATION FOR MULTI-RESOLUTION VOLUME DATA WITH REGULAR GRIDS

Authors:

Ji Ma, David Murphy, Cian O’Mathuna, Michael Hayes and Gregory Provan

Abstract: Visualization and analysis of large data sets remains a significant challenge to the visualization community. Various data reduction techniques to deal with large data sets have been proposed over past years. As one of the more popular solutions, multi-resolution (MR) data model is used to reduce the size of original data sets into different resolution levels. However, one side effect of using such a technique is that the integrity of original data is adversely affected leading to the introduction of errors. In this paper, we address this issue by introducing two new uncertainty visualization techniques, which represent both MR approximations of original data and the uncertainty information associated with each approximation to enable users to preserve the integrity of the original data. Our techniques are applied to an example of volume data with regular grids from medical domain to demonstrate their effect and usability.

Paper Nr: 14
Title:

COMAV - A COMPONENT APPLICATION VISUALIZATION TOOL - Use of Reverse Engineering and Interactivity in Visualization for Component Software Comprehension

Authors:

Jaroslav Šnajberk and Přemek Brada

Abstract: Visualization of software applications plays an important part in the process of comprehending new software systems and is even more important due to its increasing complexity. Component-based development works with complex structure of black-box units and paradoxically there is not much choice in terms of both notation and tooling when one needs to visualize structure of these component-based applications. Reverse engineering is available for only a few component models and the state of the practice in visualization is the simple and static component diagram introduced in UML 2.0. In this paper we present a tool that is generic and it is therefore usable for any component-based application. This tool works with an advanced meta-model (ENT) as an intermediate data model to store all the reverse-engineered information about these applications. This information is then available for further visualization. A new notation based on this meta-model is also suggested in this paper which uses several interactive techniques to enhance the comprehension process.

Paper Nr: 28
Title:

HARDWARE-ACCELERATED WEB VISUALIZATION OF VECTOR FIELDS - Case Study in Oceanic Currents

Authors:

Mauricio Aristizabal, John Congote, Alvaro Segura, Aitor Moreno, Harbil Arregui and Oscar Ruiz

Abstract: Visualization of vector fields plays an important role in research activities nowadays. Increasing web applications allow a fast, multi-platform and multi-device access to data. As a result, web applications must be optimized in order to be performed heterogeneously as well as on high-performance as on low capacity devices. This paper presents a hardware-accelerated scheme for integration-based flow visualization techniques, based on a hierarchical integration procedure which reduces the computational effort of the algorithm from linear to logarithmic, compared to serial integration methodologies. The contribution relies on the fact that the optimization is only implemented using the graphics application programming interface (API), instead of requiring additional APIs or plug-ins. This is achieved by using images as data storing elements instead of graphical information matrices. A case study in oceanic currents is implemented.

Paper Nr: 45
Title:

FULLY-DISTRIBUTED DEBUGGING AND VISUALIZATION OF DISTRIBUTED SYSTEMS IN ANONYMOUS NETWORKS

Authors:

Cédric Aguerre, Thomas Morsellino and Mohamed Mosbah

Abstract: The debugging of distributed algorithms is a major challenge which greatly benefits from the help of an interactive and informative human-computer interface. In this paper we present ViSiDiA, a platform for the visualization, simulation and debugging of distributed algorithms. Our approach respects real-life constraints such as process anonymity and privacy, network synchronicity. We propose a new fully-distributed method for the debugging and monitoring of distributed systems, based on the computation of global states and global predicates from local information in anonymous and asynchronous networks. We show how the debug information can be visualized concurrently with the algorithm execution.

Paper Nr: 47
Title:

CUSTOMIZABLE VISUALIZATIONS WITH FORMULA-LINKED BUILDING BLOCKS

Authors:

Mohammad A. Kuhail and Soren Lauesen

Abstract: One approach to visualization construction is to use complex blocks (widgets) that are tailored for specific visualizations, and customize the visualizations by setting the properties of the widgets. This approach allows fast and easy visualization construction but falls short if the user wants different appearance or behaviour than what the widgets support. Another approach is to combine primitive graphical elements using traditional programming or visualization toolkits. Traditional programming allows high customizability, but it is time consuming and hard to develop advanced visualizations. Visualization toolkits allow easier visualization creation in some cases, but customization and interaction are tedious. As an alternative, we developed uVis visualization tool that uses spreadsheet-like formulas to connect building blocks. uVis formulas can refer to building blocks and database tables. We created several advanced visualizations, and compared our approach against others. Evaluation shows that our approach improved customizability.

Paper Nr: 52
Title:

VISUALIZATION OF MEASURED AND ESTIMATED NETWORK CHARACTERISTICS OF THE INTERNET

Authors:

Masahito Shiba

Abstract: Information provided by research on the measurement and estimation of network characteristics of the Internet is vast; therefore, it is difficult to understand and analyze it. We developed a system that includes tools to analyze and visualize both measured and estimated network characteristics of the Internet in order to obtain useful information from these characteristics. Our tools can process large amount of data on network characteristics that were preliminarily measured and estimated. The tools use geographic information for analysis and visualization; users can add codes and extend the functions of analysis and visualization. Moreover, users can easily analyze and visualize the network characteristics of the Internet for various purposes. This paper describes the visualization of network characteristics of the Internet by the tools.

Paper Nr: 53
Title:

VISUAL INTERFACE FOR THE CONCEPT DISTRIBUTION ANALYSIS IN VIDEO SEARCH RESULTS - Multi-Concept Relevance Map (MCRM)

Authors:

Alain Simac-Lejeune

Abstract: Video media are now emerging with the democratization of broadband, capture tools and content delivery services. Despite the current performance of the 'traditional' search engines, the video search engines are challenged by the semantic difference between requests made verbatim and the data as video. Thus, most engines are not based on content but on the tags associated with documents. The approach presented in this paper is based on extraction of high-level semantics information and offers a visualization of the results based on the content, representativeness, temporal location and redundancy, which ensures the users a high level of relevance of their research results.

Paper Nr: 58
Title:

FOR 3D DISPLAYS, LENS ACCOMMODATION IS VARIABLE AND IT IS CONSISTENT WITH CONVERGENCE

Authors:

Tomoki Shiomi, Masaru Miyao, Hiroki Hori, Keita Uemoto, Akira Hasegawa, Masako Omori, Satoshi Hasegawa, Hiromu Ishio and Hiroki Takada

Abstract: Recently, 3D technology has been developing. It is generally explained to the public that, “During stereoscopic vision, accommodation and convergence are mismatched and this is the main reason for the visual fatigue caused by 3D”. The aim was to compare fixation distances between accommodation and convergence in young subjects while they viewed 2D and 3D video clips. Measurements were made using an original machine, and 2D and 3D video clips were presented using a liquid crystal shutter system. As results, subjects’ accommodation and convergence were found to change the diopter value periodically when viewing 3D images. These findings suggest that the ocular functions when viewing 3D images are very similar to those during natural viewing. When subjects are young, accommodative power while viewing 3D images is similar to the distance of convergence, and the two values of focusing distance are synchronized with each other.

Paper Nr: 60
Title:

NEW RAILWAY TRANSFER SEARCH PROPOSAL - The Development of the Interactive Design Tool using the Graph Visualization of Railway Transfer Process

Authors:

Takeshi Sato and Michiaki Yasumura

Abstract: While individual needs are diversified, the information which railway users search for is also diversified. But if we cannot offer the information which the users want, there is a possibility that the opportunity loss of "transfer" and "consumption". Train transfer search engine web services let us know only information of transfer route consisted by departure stations and arrival stations. It is difficult to satisfy user’s demands. On this paper, we discuss the way of the railway promotion with visualization of train transfer process using railway diagram.

Paper Nr: 61
Title:

STEP NAVI - A Navigation Support System by Visualization of Walking Speed

Authors:

Kazuya Fujisawa and Michiaki Yasumura

Abstract: In recent years, users of walking navigation services is increasing with the spread of smart phones, such as iPhone and Android. Walking navigation utilizes GPS function in a smart phone to find out current position of a user. When using route navigation, users would like to arrive at their destination correctly. However, in many cases, this is not the only purpose that they would like to accomplish. They also would like to arrive at the destination in time. In this research, we propose a system called “StepNavi” that allows a user to know current walking speed is over paced or under paced.

Paper Nr: 62
Title:

FLIPCLOAK - The Window Manager System for Overlapping Windows with Vacuum Metaphor of Visualizations

Authors:

Ryutaro Motora, Toshiyuki Masui and Michiaki Yasumura

Abstract: Overlapping windows prevent us from finding the target window immediately. They reduce the operability and the visibility so that it is important issue how to visualize and manage the windows on a desktop. In this research we propose the new window management method that uses combinational operation with a personal computer and a smartphone. Then we prototype the application called the FlipCloak. The FlipCloak is the system that controls transfer of windows on the desktop between devices with simple gestural interaction. Using the FlipCloak we can manage windows on a desktop efficiently by putting the low-priority window in the other device temporarily as putting one’s stuff in the cloakroom.

Paper Nr: 63
Title:

CQ SUBMARINE - The Interface for Searching and Visualizing Videos based on Feelings of Distance and Direction

Authors:

Takeru Yoshihara and Michiaki Yasumura

Abstract: In consequence of the progress of globalization in information technology, all information have been uniformized without any attention to the place the contents were made. For example, we search for videos and watch them in the same way on PC, even if some of them were made in our home cities, while others were made abroad. Therefore, users can not feel the background of the contents, and they can not realize essence of contents. In this research, we developed CQ Submarine which is the system for searching videos based on feelings of distance and direction. In this system, users set the distance and direction from themselves, then they can watch the videos which were made in the area where users set. This searching process allow users to have imagination, aspiration, amazement, and discovery about that area. We also made a demo of CQ Submarine at an exhibition on travel applications that was held in Tokyo in 2011, and got a lot of feed backs from initial users.

Paper Nr: 64
Title:

VIS4AUI: VISUAL ANALYSIS OF BANKING ACTIVITY NETWORKS

Authors:

Walter Didimo, Giuseppe Liotta and Fabrizio Montecchiani

Abstract: We present the system VIS4AUI, aimed at supporting the analyst to discover financial crimes related to money laundering. An anti-money laundering archive collects financial information with regard to ongoing bank relationships and high value transactions. VIS4AUI is able to import and analyze the Italian anti-money laundering archive (AUI) in order to visualize the banking activity networks arising from it. In the demonstration, the user will be given an evidence of a possible suspicious person or company; starting from such a seed entity, the task will be that of exploring and analyzing her network of transactions through the tools provided by the system. In order to immerse the user in a fully interactive experience, VIS4AUI is a touch-optimized application, only requiring a touchscreen as interface.

Paper Nr: 65
Title:

A NEW VISUALIZATION METAPHOR FOR ASSOCIATION RULES

Authors:

Zohra Ben Said, Fabrice Guillet, Paul Richard, Julien Blanchard and Fabien Picarougne

Abstract: In order to discover knowledge from large amount of results generated by the association rules extraction algorithms, visual representations of association rules can be very beneficial to the user. Those representations support the user in finding and validating interesting knowledge. All techniques proposed for association rule visualization have been developed to represent association rule as a hole without paying attention to the relations between attributes and the contribution of each one. In this article, we propose a new visualization metaphor for association rules. This new metaphor represents attributes which make up the antecedent and the consequent, the contribution of each one to the rule, and the correlations between each pair of antecedent and consequent.

Paper Nr: 66
Title:

A STEREO LINE SENSOR SYSTEM TO HIGH SPEED CAPTURING OF SURFACES IN COLOR AND 3D SHAPE

Authors:

Trendafil Ilchev, Erik Lilienblum, Bernd Joedicke, Bernd Michaelis and Markus Schnitzlein

Abstract: Line scan cameras offer very high spatial resolution, allowing even multispectral color acquisition and are therefore often used for quality control at the conveyor belt. A logical extension is to complement the broad spectrum of the missing channel depth data. For industrial use, the technology combines the advantages of customized cameras with proven 3D evaluation methods which are known from 3D-matrix camera systems. The present system allows the rapid and simultaneous detection of color and 3D depth with small random errors, preferably relatively flat (not fissured) surfaces. Standard deviation of 10 microns could already be realized in practice. Color and 3D data are from the same measurement system and are in exactly the same coordinate system. This can be a significant advantage in quality assurance, such as testing manufactured goods to a good match of form and texture. The use of massively parallel hardware (GPUs) currently allow performance of approximately 100 million disparity values per second.