An interactive data visualization system

GRAFANA is an interactive program, which allows the user to produce drawings based on data stored on a disk file. The major advantage and originality of the system is that the user can interactively determine the visual effect of a drawing and immediately see it on the screen. Moreover, any drawing produced by GRAFANA can still be edited by a generalpurpose graphics editor. This system allows the user to obtain precisely the right drawing for any book, paper or report. GRAFANA has been implemented in MIRA-2D, a graphical Pascal extension. It is available for different machines and kinds of graphical devices.     

GlyphLink: An interactive visualization approach for semantic graphs

Graph analysis by data visualization involves achieving a series of topology-based tasks. When the graph data belongs to a data domain that contains multiple node and link types, as in the case of semantic graphs, topology-based tasks become more challenging. To reduce visual complexity in semantic graphs, we propose an approach which is based on applying relational operations such as selecting and joining nodes of different types. We use node aggregation to reflect the relational operations to the graph. We introduce glyphs for representing aggregated nodes. Using glyphs lets us encode connectivity information of multiple nodes with a single glyph. We also use visual parameters of the glyph to encode node attributes or type specific information. Rather than doing the operations in the data abstraction layer and presenting the user with the resulting visualization, we propose an interactive approach where the user can iteratively apply the relational operations directly on the visualization. We present the efficiency of our method by the results of a usability study that includes a case study on a subset of the International Movie Database. The results of the controlled experiment in our usability study indicate a statistically significant contribution in reducing the completion time of the evaluation tasks.     

An interactive procedure for shape preserving cubic spline interpolation

An interactive system is presented which allows flexible shape preserving cubic spline interpolation. The corresponding parameter-depending minimization problem is considered, but similar results are then obtained by means of an interactive adjustment procedure for which the total amount in arithmetic operation is only 0(n).     

An interactive FORTRAN program for three-dimensional molecular visualization

An interactive FORTRAN program executable in the VAX/VMS computer environment has been developed for three-dimensional molecular visualization on the Evans & Sutherland Picture System 390. The essential features of this program are described and the FORTRAN source code is available upon request.     

Smoke surfaces: an interactive flow visualization technique inspired by real-world flow experiments

Smoke rendering is a standard technique for flow visualization. Most approaches are based on a volumetric, particle based, or image based representation of the smoke. This paper introduces an alternative representation of smoke structures: as semi-transparent streak surfaces. In order to make streak surface integration fast enough for interactive applications, we avoid expensive adaptive retriangulations by coupling the opacity of the triangles to their shapes. This way, the surface shows a smoke-like look even in rather turbulent areas. Furthermore, we show modifications of the approach to mimic smoke nozzles, wool tufts, and time surfaces. The technique is applied to a number of test data sets.     

VideoMap: An interactive and scalable visualization for exploring video content

Computational Visual Media - Large-scale dynamic relational data visualization has attracted considerable research attention recently. We introduce dynamic data visualization into the multimedia...     

Highly interactive distributed visualization

We report on our iGrid2005 demonstration, called the “Dead Cat Demo”; an example of a highly interactive augmented reality application consisting of software services distributed over a wide-area, high-speed network. We describe our design decisions, analyse the implications of the design on application performance and show performance measurements.     

FEMvrml: An interactive virtual environment for visualization of finite element simulation results

Finite element simulations produce information that is proportional to the size of the numerical model. For large models, the data produced is voluminous and can therefore be challenging to deal with and interpret. This paper discusses the use of virtual reality to manage this information and presents FEMvrml, an interactive virtual environment within which users can interact with and explore the simulation results. The structure and methodology behind FEMvrml and the algorithms employed are described along with application examples that show the effectiveness and capabilities of the system.     

基于Web的PSE-Bio交互式可视化

PSE-Bio是一个基于Web服务面向生物信息学的问题求解平台。为了方便用户仅使用浏览器就能分析调用服务返回的结果,采用SVG技术实现基于WEB的可视化,设计了面向对象的统一可视化数据对象以封装调用不同Web服务返回的消息;设计了面向对象的可视化图形对象以利于交互可视化的实现;并用SVG脚本语言实现了用户与图形的交互以及可视化结果与服务的交互。实验结果表明,基于SVG的可视化方案能够满足生物信息数据的Web可视化需求。     

Advanced interactive visualization for CFD

New ideas are presented for the visualization of computational fluid dynamics data. These include both unsteady two-dimensional and steady three-dimensional data on either structured or unstructured grids. In addition to presenting some specific algorithm advances, considerable attention is devoted to innovative interactive probes and the appropriate choice of program architecture and internal data structure.     

OpinionSeer: interactive visualization of hotel customer feedback

The rapid development of Web technology has resulted in an increasing number of hotel customers sharing their opinions on the hotel services. Effective visual analysis of online customer opinions is needed, as it has a significant impact on building a successful business. In this paper, we present OpinionSeer, an interactive visualization system that could visually analyze a large collection of online hotel customer reviews. The system is built on a new visualization-centric opinion mining technique that considers uncertainty for faithfully modeling and analyzing customer opinions. A new visual representation is developed to convey customer opinions by augmenting well-established scatterplots and radial visualization. To provide multiple-level exploration, we introduce subjective logic to handle and organize subjective opinions with degrees of uncertainty. Several case studies illustrate the effectiveness and usefulness of OpinionSeer on analyzing relationships among multiple data dimensions and comparing opinions of different groups. Aside from data on hotel customer feedback, OpinionSeer could also be applied to visually analyze customer opinions on other products or services.     

An interactive tool for the visualization of cathode-ray tube monitor gamuts

The aim of this work was the development of an interactive tool for the visualization and the comparison of cathode-ray tube monitor gamuts.     

MOLVIE: an interactive visualization environment for molecular structures

A Molecular visualization interactive environment (MOLVIE), is designed to display three-dimensional (3D) structures of molecules and support the structural analysis and research on proteins. The paper presents the features, design considerations and applications of MOLVIE, especially the new functions used to compare the structures of two molecules and view the partial fragment of a molecule. Being developed in JAVA, MOLVIE is platform-independent. Moreover, it may run on a webpage as an applet for remote users. MOLVIE is available at http://www.cs.ucsb.edu/~mli/Bioinf/software/index.html.     

Web-based dynamic and interactive environmental visualization

The development of novel interactive visualizations can substantially contribute to environmental modeling and understanding of complex environmental processes. To allow the Web Map Service (WMS) to support this, this paper explores a generic framework in which a dynamic environmental modeling process can be interactively visualized, controlled and tuned on the Internet by using Java 3D-based hybrid Internet computation through the simulation steering technique. A hydrological model, TOPMODEL, is employed to illustrate the simulation of a rainfall-run off process within a computational and steering environment. This environment allows users to visually interact and experiment with model computation, thereby facilitating the exploration of process-based environmental applications.     

Declarative language design for interactive visualization

We investigate the design of declarative, domain-specific languages for constructing interactive visualizations. By separating specification from execution, declarative languages can simplify development, enable unobtrusive optimization, and support retargeting across platforms. We describe the design of the Protovis specification language and its implementation within an object-oriented, statically-typed programming language (Java). We demonstrate how to support rich visualizations without requiring a toolkit-specific data model and extend Protovis to enable declarative specification of animated transitions. To support cross-platform deployment, we introduce rendering and event-handling infrastructures decoupled from the runtime platform, letting designers retarget visualization specifications (e.g., from desktop to mobile phone) with reduced effort. We also explore optimizations such as runtime compilation of visualization specifications, parallelized execution, and hardware-accelerated rendering. We present benchmark studies measuring the performance gains provided by these optimizations and compare performance to existing Java-based visualization tools, demonstrating scalability improvements exceeding an order of magnitude.     

Ambiguity-free edge-bundling for interactive graph visualization

Graph visualization has been widely used to understand and present both global structural and local adjacency information in relational data sets (e.g., transportation networks, citation networks, or social networks). Graphs with dense edges, however, are difficult to visualize because fast layout and good clarity are not always easily achieved. When the number of edges is large, edge bundling can be used to improve the clarity, but in many cases, the edges could be still too cluttered to permit correct interpretation of the relations between nodes. In this paper, we present an ambiguity-free edge-bundling method especially for improving local detailed view of a complex graph. Our method makes more efficient use of display space and supports detail-on-demand viewing through an interactive interface. We demonstrate the effectiveness of our method with public coauthorship network data.     

3D stereo interactive medical visualization

Our interactive, 3D stereo display helps guide clinicians during endovascular procedures, such as intraoperative needle insertion and stent placement relative to the target organs. We describe a new method of guiding endovascular procedures using interactive 3D stereo visualizations. We use as an example the transjugular intrahepatic portosystemic shunt (TIPS) procedure. Our goal is to increase the speed and safety of endovascular procedures by providing the interventionalist with 3D information as the operation proceeds. Our goal is to provide 3D image guidance of the TIPS procedure so that the interventionalist can readily adjust the needle position and trajectory to reach the target on the first pass. We propose a 3D stereo display of the interventionalist's needle and target vessels. We also add interactivity via head tracking so that the interventionalist gains a better 3D sense of the relationship between the target vessels and the needle during needle advancement.     

Pursuing interactive visualization of irregular grids

Many branches of the sciences produce sample data not arranged on rectilinear grids, and visualization of such data is generally more complex than visualizing more regular data. While isosurface algorithms such as marching cubes can be adapted with relatively little performance penalty, direct volume rendering presents more difficulties. This paper explores these issues, concentrating on algorithms for a particular kind of irregular grid known as a curvilinear grid, composed of six-sided cells that may be considered a result of the deformation of a regular rectilinear grid.     

An interactive 3D medical visualization system based on a light field display

We present a prototype medical data visualization system exploiting a light field display and custom direct volume rendering techniques to enhance understanding of massive volumetric data, such as CT, MRI, and PET scans. The system can be integrated with standard medical image archives and extends the capabilities of current radiology workstations by supporting real-time rendering of volumes of potentially unlimited size on light field displays generating dynamic observer-independent light fields. The system allows multiple untracked naked-eye users in a sufficiently large interaction area to coherently perceive rendered volumes as real objects, with stereo and motion parallax cues. In this way, an effective collaborative analysis of volumetric data can be achieved. Evaluation tests demonstrate the usefulness of the generated depth cues and the improved performance in understanding complex spatial structures with respect to standard techniques.