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Information Visualisation, 2004. IV 2004. Proceedings. Eighth International Conference on

Date 14-16 July 2004

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Displaying Results 1 - 25 of 164
  • Real-time visualisation within the Multimod Application Framework

    Publication Year: 2004 , Page(s): 21 - 26
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB) |  | HTML iconHTML  

    This work gives an overview of real-time visualisation algorithms developed under the EC-funded project Multimod to support a novel paradigm for the virtual representation of musculo-skeletal structures. These algorithms are fully integrated into the Multimod Application Framework (MAF), an open-source freely-available software framework for the rapid development of medical visualisation applications. MAF is based on the visualisation toolkit (VTK) and other specialised toolkits, e.g. for image registration and segmentation, collision detection or numerical computation. MAF provides a range of high-level components that can be easily combined for rapid construction of visualisation applications that support synchronised views. The majority of algorithms available within the standard underlying MAF toolkits were frequently either too slow or too general for our purposes. We have thus implemented computationally efficient versions of existing algorithms, e.g. for surface and volume rendering, and more importantly, developed new techniques, e.g. for X-ray rendering and designing volume rendering transfer functions. To achieve interactive rendering we have employed a scheme for space partitioning. The emphasis is on exploiting the characteristics of medical datasets (e.g. density value homogeneity) but further utilising the hardware-accelerated capabilities of modern graphics cards. In this context, calculations are moved into hardware as appropriate while avoiding dependency on specialised features of particular manufacturers so as to ensure real code portability. View full abstract»

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  • MPLS multicasting using caterpillars and a graceful labelling scheme

    Publication Year: 2004 , Page(s): 382 - 387
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (323 KB) |  | HTML iconHTML  

    In This work we describe MPLS (multi-protocol label switching) multicasting under a specific graph (graceful) labeling with the use of the specific multicast tree topology called caterpillar. The use of a caterpillar as the multicast tree is analyzed and compared with the other tree topologies under a multicast network metric. The labeling algorithm proposed uniquely assigns link labels based on the node numbering which in turn enables to give a sharp estimate to the time-to-live parameter and assists in choosing optimal selection of rendezvous points. The graceful code for the caterpillar has revealed an efficient method (G-trace) of the reconstruction of multicast tree topology which in turn to be used for maintainability and for the other purposes in the management site. View full abstract»

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  • Multiscale hybrid MDS

    Publication Year: 2004 , Page(s): 388 - 393
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (639 KB) |  | HTML iconHTML  

    We present a multiscale MDS method extending Chalmers' pivot-based MDS algorithm (Morrison et al., 2003). Our multi-scale strategy is itself based on a 0(N log N) hybrid MDS approach. Our algorithm clearly improves over its predecessors with respect to time, while producing layouts of a comparable quality. View full abstract»

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  • Dimensionality reduction for content-based image classification

    Publication Year: 2004 , Page(s): 435 - 438
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (702 KB) |  | HTML iconHTML  

    Effective ways of organizing image descriptors is a critical design step of content-based image classification systems. Suitable descriptors are selected according to the problem domain for generating the feature space. Using several descriptors improves accuracy of representation but risen some challenges such as non linear combination, expensive computation and the curse of dimensionality. In This work an approach using a non parametric statistical test for effective dimensionality reduction is presented. The proposed method facilitates feature discrimination and keeps relevant information. View full abstract»

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  • Arc-coloring of directed hypergraphs and brick-coloring of walls

    Publication Year: 2004 , Page(s): 394 - 399
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (361 KB) |  | HTML iconHTML  

    We define an arc-coloring for a class of directed hypergraphs, in such a way that any two arcs having either intersecting tails or the same head must be colored differently. We investigate the arc-coloring of non-overlapping hypergraphs, namely hypergraphs which can be represented by 2-dimensional adjacency matrices (walls). In particular, coherent walls of degree d - corresponding to interval hypergraphs of degree d - are shown to be optimally colorable in at most 2d - 1 colors. Such property is the first step toward the chromatic classification of coherent walls of fixed degree. As the main result in that vein, we settle the above problem for the degree equal to 2, by providing an enumeration of "essentially distinct" walls in terms of necklaces and beads. View full abstract»

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  • Issues in the non-visual presentation of graph based diagrams

    Publication Year: 2004 , Page(s): 671 - 676
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    One aspect of non-visual visualisation is providing accessibility to diagrams for users with visual impairments. In this paper, we review the literature on diagrams and non-visual presentation in order to elucidate the issues involved in making graph based diagrams accessible using speech and non-speech sound. First we examine the nature, scope and uses of these diagrams. We then describe the nature of diagrams: how do diagrams differ from other representations; how do sighted readers read, understand, and extract information from diagrams; what cognitive processes do diagrams facilitate; and what factors affect how diagrams may be understood? After a comparison of visual with aural presentation we discuss the work presented by others in this field, particularly looking at their reasons for implementing how they do in light of our examination of visual comprehension. The paper concludes with a discussion of how these issues combine and conflict to influence requirements for interface design. View full abstract»

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  • Human figure control software for real-virtual application

    Publication Year: 2004 , Page(s): 858 - 862
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    We present human figure control software using vision-based human motion capturing. We have already developed core techniques for vision-based human motion tracking and motion synthesis. We have provided the first version software as an open source kit. In this work, we have developed the second version software with modified motion synthesis. Our software consists of the following software: the vision software (includes 2D blob tracking modules and stereo vision module) and the motion synthesis software (includes skeletal structure reconstruction from a limit number of 3D positions, i.e., physically simulated joint position estimator). This software can be employed for many real-virtual applications such as avatar based video conferencing, virtual human control, and 3D game consoles which need the user postures as input. Our software requires the following hardware: more than two firewire cameras for vision processing and more than one PC for vision processing, motion synthesis, and rendering. In our real-virtual system, this software is also employed for virtual object manipulation interface with augmented avatar representation. View full abstract»

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  • Fourth order PDE blends

    Publication Year: 2004 , Page(s): 1013 - 1019
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB) |  | HTML iconHTML  

    It has been reported a fourth order partial differential equation is effective in solving surface blending problems. In this paper, we present a new approximate solution to the fourth order partial differential equation and apply it to a number of surface blending tasks. The approximate solution consists of two parts: a blended part of boundary functions is used to accurately satisfy the original boundary conditions that define the blending surfaces; and a bivariate polynomial with zeroed boundary conditions, which is used to minimize the error of the fourth order partial differential equation. Using the developed method, a number of examples are investigated to demonstrate the applications of the proposed method in surface blending. View full abstract»

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  • The Multimod Application Framework

    Publication Year: 2004 , Page(s): 15 - 20
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (277 KB) |  | HTML iconHTML  

    This paper presents the Multimod Application Framework, a software framework for the rapid development of computer-aided medicine applications. This framework, distributed under an open source licence, is being developed as part of the Multimod Project, a multi-national research endeavour partially supported by the European Commission through the Fifth Framework Programme. This application framework provides an effective re-use model for visualisation and data-processing algorithms that may be incorporated into the framework with moderate overhead and then made available to the biomedical research community as part of a complete set of applications. View full abstract»

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  • Visualization of complex molecular ribbon structures at interactive rates

    Publication Year: 2004 , Page(s): 737 - 744
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1127 KB) |  | HTML iconHTML  

    The increasing size of protein data available in Internet databases demands new fast methods of visualization. This paper introduces a novel visualization technique for molecular ribbon structures. The method is based on Combined BReps - a mesh structure defining a combination of polygonal faces and Catmull/Clark surfaces. Our technique provides high frame rates when interactively moving through structures of highest complexity as well as high quality images when the viewpoint remains static. View full abstract»

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  • Interactive cluster analysis

    Publication Year: 2004 , Page(s): 471 - 476
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (345 KB) |  | HTML iconHTML  

    One of the first questions we pose when we have a new data set to explore is: are there any obvious groupings in the data? These clusters reveal the structure of the data set and make the data easier to understand. Cluster analysis is a classic problem and there are many tools for it. The problem is that these methods often give conflicting and too fine-grained results for practical use. As well, they are accompanied with the danger of over-interpreting the data. Another drawback in these techniques is that they do not usually provide an opportunity for interactive exploration. We propose a simple user interface and method to interactively explore clusters in data sets. The method is based on a rapid dynamic query and it can detect both hierarchical and partitional clusters. View full abstract»

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  • Fast simulation of deformable objects

    Publication Year: 2004 , Page(s): 422 - 427
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (363 KB) |  | HTML iconHTML  

    This work presents a new deformation algorithm for computer graphics and animation applications. The algorithm is motivated by the mass-spring systems and the ChainMail technique and possesses advantages of both methods. It uses a one-step approach to find the deformation, and therefore is very fast. Simulation parameters can easily be chosen in order to represent deformation characteristics. The algorithm is applicable to various simulation applications and produces very promising results. View full abstract»

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  • Gaze data visualization tools: opportunities and challenges

    Publication Year: 2004 , Page(s): 173 - 180
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB) |  | HTML iconHTML  

    Addressing data visualization challenges typically involves applying lessons from visualization theory to inform design and implementation approaches. This process is shaped to a large extent by the availability of tools that are aimed at enabling visualization designers to focus on visualization design rather than on low-level software engineering. Recently, such tools have become powerful enough to be used effectively. We discuss the ideation process informing our design approach and describe the use of Macromedia Flash MX 2004 for the rapid prototyping of a gaze data visualization tool. We highlight selected gaze data visualization ideas to illustrate the most innovative aspects of our design. In particular, we explain our strategy to reveal the underlying mechanisms that produce the summarizing visual constructs and why this is important. We introduce a new technique for visualizing gaze data for dynamic stimuli. The novelty of this approach is that it avoids the traditional frame-by-frame analyses typically carried out for such stimuli. View full abstract»

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  • Cooperative control with haptic visualization in shared virtual environments

    Publication Year: 2004 , Page(s): 533 - 538
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (708 KB) |  | HTML iconHTML  

    A distributed PHANToM-based system for collaborative haptic visualization of a VR crank is presented. Physical IDOF crank model providing realistic kinaesthetic sensations of inertia and viscosity is described. Theoretical and experimental kinematic trajectory patterns are compared for the case of cooperative two-arm human movements. Nonvisual visualization applications of the system are discussed. View full abstract»

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  • Estimating the "mental image" for comprehensible rendering of 3D objects

    Publication Year: 2004 , Page(s): 555 - 560
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (984 KB) |  | HTML iconHTML  

    We present a method for comprehensible nonphotorealistic rendering of 3D free-form objects. The objects are rendered using a small amount of lines such as silhouettes or hatching strokes. The lines are carefully placed to ensure the user would understand the structure of the rendered object correctly. The user's "mental image" of the object is estimated using simplified methods of computer vision, allowing 3D shape reconstruction from the rendered image. The difference between the original model and the estimated "mental image" is used as a feedback for refining the line placement. The process stops when the difference is sufficiently low, which means the users would understand the rendering sufficiently well despite its simplicity. View full abstract»

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  • A path based model for sonification

    Publication Year: 2004 , Page(s): 865 - 870
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    Recently researchers have been interested in non-visual forms of presentation. Sound, touch, smell, as well as vision can be used to depict information. One important medium is sound; it can encode information for the blind or partial sighted, used to display information when it is impossible to use a screen, and the hardware is cheap and widely available. Researchers have investigated sonifying various data sources with different data types and configurations. We present a novel path-based model that can be used to describe each of these different sonifications. In summary, the path dictates the sonification tour, the data is mapped into sound via a transfer function, and the quantity of information being sonified is determined by both the span and how the abstract path is registered to the data. View full abstract»

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  • A three-dimensional authoring/presentation system for immersive virtual environments: Poster3D

    Publication Year: 2004 , Page(s): 785 - 791
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (744 KB) |  | HTML iconHTML  

    We have proposed and developed a simple 3D authoring/presentation system for immersive virtual reality environments. Our system enables a user to create and edit presentation content both by using a 2D graphical user interface (GUI) on a PC desktop, and through direct manipulation by hand gestures in an immersive environment. The user can thus enjoy the advantages of both simple GUI operations on the desktop and efficient tuning of 3D layout by direct manipulation. The system exploits various features of 3D visualization including 3D nested structures, 3D graph structures for hyperlinks, and 3D depth for zooming or focus+context visualization. In other words, our system utilizes 3D virtual space to produce effective and interactive 3D presentations in immersive virtual environments. View full abstract»

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  • Using visual exploratory data analysis to find bias in option pricing models

    Publication Year: 2004 , Page(s): 29 - 34
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (436 KB) |  | HTML iconHTML  

    Options are amongst the most heavily transacted financial instruments in the world. This paper examines how the methods of visual exploratory tools, espoused by Cleveland (1993) can be used to analyze the residuals from conventional option pricing models (Black and Scholes, 1972; Black, 1976). Until recently, these models were believed to be unbiased (Rubinstein, 1985; Lajbcygier, 1999). With the aid of visual exploratory tools we see that options on the All Ordinaries share price index trading on the Sydney Futures exchange have persistent, systematic and significant bias. This is the first time that various statistically oriented visual exploratory tools have been used to analyze option residuals. We find that the analysis motivates the use of alternative option pricing methods. View full abstract»

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  • Integration of unsupervised clustering, interaction and parallel coordinates for the exploration of large multivariate data

    Publication Year: 2004 , Page(s): 52 - 57
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (654 KB) |  | HTML iconHTML  

    Parallel coordinates are widely used in many applications for visualization of multivariate data. Because of the nature of parallel coordinates, the visualization technique is often used for data overview. However, when the number of tuples to be visualized becomes very large, this technique makes it difficult to distinguish the overall structure. In This work we present a novel technique which uses a classification approach, the self-organizing map (an unsupervised learning algorithm), to solve this problem by creating an initial clustering of the data. By initially only visualizing the resulting representational clusters, the inherited global structure can be shown. Using linked views and allowing the user to perform drill-down and filtering on these representations reveals the single data items without loss of context. View full abstract»

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  • Supporting program development comprehension by visualising iterative design

    Publication Year: 2004 , Page(s): 717 - 722
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (562 KB) |  | HTML iconHTML  

    eL-CID (e-Learning by Communicating Iterative Design) demonstrates computer programs' iterative design using computer animation. It translates descriptions of iterative editing into an animated demonstration. An analysis of the work of expert programming trainers shows that successive versions of a program are shown statically. eL-CID attempts to visualise the changes dynamically as if code was being edited in front of the user. Several example demonstrations have been developed. To the author's knowledge, this is the first system designed to visualise the iterative process of program development. View full abstract»

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  • Landmark representation in 3-D nautical charts

    Publication Year: 2004 , Page(s): 159 - 164
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1111 KB) |  | HTML iconHTML  

    This work first presents an overview of a research project in the field of information design concerning a new 3-D decision support system for nautical navigation, a 3-D cart. The paper then discusses landmark representation in the virtual environment of the chart; particularly the representation of forested islands and coasts where the tree canopy is an important feature in the silhouette. Experiment with removing certain parts of laser scanned data, shows promising results when it comes to recreating the silhouette of islands with forests or groves of trees in the virtual environment. View full abstract»

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  • New methods for visual information seeking through video browsing

    Publication Year: 2004 , Page(s): 450 - 455
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (438 KB) |  | HTML iconHTML  

    In This work we introduce new approaches for visual information seeking in video documents. We argue that a discrete visualization of continuous media streams via static keyframes is not sufficient to fulfill all information needs and therefore additional, more interactive techniques are required. We extend the concept of elastic interfaces, which has been used successfully with discrete documents, by applying it to continuous data streams. In addition, we propose a different integration of the elastic browsing functionality called "elastic panning". A first usability test is presented in order to prove its feasibility and to highlight its main advantages, namely the ability to access any position within a file independent of its length, and the smoother visual feedback during navigation compared to a standard slider interface. View full abstract»

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  • From ethno-mathematics to generative design: metapatterns and interactive methods for the creation of decorative art

    Publication Year: 2004 , Page(s): 941 - 946
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2796 KB) |  | HTML iconHTML  

    The research discussed in This work focuses on the development of interactive methods to image and analyze the surface designs of cultural artifacts and the generation of new designs. The project is interdisciplinary and uses methodologies from aesthetic and cultural inquiry, mathematics and computer science. The results of the research are obtained by using a combination of tools, such as neural networks, pattern recognition techniques including edge detection, and pattern generating techniques such as shape grammars. The first phase of this research focuses on the analysis of Congolese Kuba cloth and Moroccan Zillij mosaics because each has a complete and complex surface pattern with very different characteristics. Our work has three main facets: the description of the geometric content of ethno-mathematical artifacts; the classification of this content; and the generation of grammatical rules for the creation of new designs based on the studied artifacts. View full abstract»

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  • Web-based collaborative 3D information visualization tool

    Publication Year: 2004 , Page(s): 925 - 929
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (699 KB) |  | HTML iconHTML  

    The amount of data that must be collected for one to decide on a course of action, nowadays and in any field, is nothing if extraordinary. The three-dimensional graphic representation of data is a powerful tool for its analysis. And the possibility for interaction and browsing throughout these data makes this analysis much more interesting and productive. Nevertheless, one doesn't usually make a decision alone, and most tools are of a single-user nature, which jeopardizes the decision-making process, especially if those involved are distant from each other, geographically speaking. With a collaborative information visualization environment, it is possible to debate over the same data and change them if necessary, in real time, diminishing time and avoiding mistakes in the decision-making process. Therefore, this paper proposes a Web-based collaborative tool for data visualization using Java, EAI (external authoring interface) and VRML (Virtual Reality Modeling Language). View full abstract»

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  • Using graphically represented ontologies for searching content on the semantic Web

    Publication Year: 2004 , Page(s): 801 - 806
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (300 KB) |  | HTML iconHTML  

    The idea behind the semantic Web is to include semantic information on each Web page, so that machine processing for retrieving relevant information is made easier (Berners-Lee et al., 1997). In order to be able to retrieve relevant information, the user still needs to be able to query the Web in an efficient way to exploit the full potential of semantic Web technology. This work describes an application design for using graphically represented ontologies for searching the (semantic) Web. One of the benefits of this approach is that these queries can be translated to different query languages such as RQL(Broekstra and Kampman, 2001; Karvounarakis, et al., 2001), OWL (Heflin, 2003), XQL (Robie et al., 1998), etc. View full abstract»

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