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检索条件"任意字段=Conference on Visual Data Exploration and Analysis IV"

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Recursive pattern: a technique for visualizing very large amounts of data

Recursive pattern: a technique for visualizing very large am...

引用

IEEE conference on visualization

作者： D.A. Keim H.-P. Kriegel M. Ankerst Institute for Computer Science University of Munich (LMU) Munich Germany

An important goal of visualization technology is to support the exploration and analysis of very large amounts of data. In this paper, we propose a new visualization technique called a 'recursive pattern', which has been developed for visualizing large amounts of multidimensional data. The technique is based on a generic recursive scheme which generalizes a wide range of pixel-oriented arrangements for displaying large data sets. By instantiating the technique with adequate data- and application-dependent parameters, the user may greatly influence the structure of the resulting visualizations. Since the technique uses one pixel for presenting each data value, the amount of data which can be displayed is only limited by the resolution of current display technology and by the limitations of human perceptibility. Beside describing the basic idea of the 'recursive pattern' technique, we provide several examples of useful parameter settings for the various recursion levels. We further show that our 'recursive pattern' technique is particularly advantageous for the large class of data sets which have a natural order according to one dimension (e.g. time series data). We demonstrate the usefulness of our technique by using a stock market application.

关键词： data visualization Humans Multidimensional systems Computer science Pattern analysis Displays Stock markets visual databases Decision making Automation

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Interactive delineation of brain sulci and their merging into functional PET images

Interactive delineation of brain sulci and their merging int...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： C. Michel M. Sibomana J.M. Bodart C. Grandin A. Coppens A. Bol A. De Volder V. Warscotte J.-P. Thiran B. Macq Positron Tomography Laboratory Université Catholique de Louvain Louvain-la-Neuve Belgium Telecommunication Laboratory Université Catholique de Louvain Louvain-la-Neuve Belgium

A set of software tools has been developed to assist the neuro(physio)logist in the analysis of a series of cerebral images from single subjects by fusing sulci manually delineated on MRI brain surface into PET functional data. The procedure requires coregistered datasets and involves 4 steps: (i) segmentation of anatomical MRI data in order to extract the brain surface, (ii) generate the brain surface views by parallel ray casting, (iii) manual delineation of the relevant sulci from the surface views and (iv) fusion of the landmarks into any coregistered dataset from the same subject. The brain surface is segmented automatically from 3D MRI data using a new "Directional Watershed Transform" algorithm. From the segmented brain surface, 8 orthogonal surface views are calculated as visual support for interactive stereo definition of the major brain sulci. Each sulcus is built as a 3D trace line using a few vertices which are manually defined on one or several surface views. This technique allows one to follow the brain surface curvature rather independently of the number and the position of the vertices. The sulci are saved in an individual file for further use. The brain surface viewer is linked (via the 3D cursor position) to an independent volume viewer containing a coregistered (anatomical or functional) volume. Sulcal landmarks are finally projected onto this volume allowing further volume of interest definition. The use of the tool set is illustrated by a single subject brain activation study after /sup 15/O water injection.

关键词： Merging Brain Magnetic resonance imaging Software tools Image analysis Positron emission tomography Image segmentation data mining Fusion power generation Casting

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EFFECTivE visualIZATION TOOLS FOR LARGE data SETS

EFFECTIVE VISUALIZATION TOOLS FOR LARGE DATA SETS

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conference on visual data exploration and analysis

作者： OBORN, SM GARLICK, DS UTAH STATE UNIV DIV COMPUTAT SCISPACE DYNAM LABLOGANUT 84321

ISBN: (纸本)0819414735

This paper explores the visualization techniques, design objectives, implementation trade-offs, and results of creating visualization tools for evaluating data from a space based sensor which is estimated to produce 8 Gigabytes of data a day for approximately 20 months. Effectiveness of visualization tools is evaluated in terms of data accessibility and user control over visual information. visual presentation is also evaluated as a contributing factor to the perceived effectiveness and success of these tools.

关键词： visualization data processing Radiometry Sensors Human-machine interfaces visual analytics Calibration data visualization Inspection Image processing

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CONFIGURABLE data-analysis AND visualIZATION SYSTEM

CONFIGURABLE DATA-ANALYSIS AND VISUALIZATION SYSTEM

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conference on visual data exploration and analysis

作者： EDWARDS, DP BRIDENSTINE, D LITTLEDIKE, L UTAH STATE UNIV DIV COMPUTAT SCISPACE DYNAM LABLOGANUT 84321

ISBN: (纸本)0819414735

data analysis software can be built using two differing philosophies: 1) Develop custom applications to meet each need as it arises, or 2) Develop a general toolbox to interactively build a wide variety of applications. In support of SPIRIT III performance assessment1, we have developed a package using the latter philosophy. A database and an analysis toolbox are paired to provide a high degree of flexibility in data retrieval, analysis and visualization. This system is integrated into SGI Explorer, which allows scientists to interactively construct analysis networks. These networks perform database queries, then apply user-selected analysis and visualization tools to the query results. The Reporter package allows interactive design of reports with multiple plots, tables and text annotations per page. The core analysis module is the Mapper, which allows the interactive transformation of 2 or 3-dimensional data into N-dimensions. Mapper allows a rich variety of conelations and relationships in the data to be examined. Finally, custom analysis networks may be saved and distributed within the user community. This package has proven an effective support for the rapidly-changing needs of SPiRIT III analysis. Due to its general nature, it also has promise for broader uses.

关键词： visualization databases data modeling data analysis Radiometry visual analytics Toxic industrial chemicals Raster graphics Software development Network security

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SAR data QUALITY analysis ON AN OPEN IMAGE-PROCESSING SYSTEM

SAR DATA QUALITY ANALYSIS ON AN OPEN IMAGE-PROCESSING SYSTEM

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conference on visual data exploration and analysis

作者： SEVERONI, S RIAZANOFF, S STEFANUTTI, M TELESPAZIO SPA COMUN SPAZIALI REMOTE SENSING SOFTWARE LABROMEITALY

ISBN: (纸本)0819414735

This paper addresses an example of Synthetic Aperture Radar (SAR) data management and processing using standard open systems. The SAR data Quality analysis application, subject of this paper, has been created by TELESPAZIO through the skill matured in the framework of the developing of ground stations devoted to the acquisition, processing and archiving of ERS-1 SAR satellite data. The SAR data Quality analysis application includes SAR data decoding, visualization of whole image with the related characteristics, visualization of a zoomed portion of the image, Impulse Response Function analysis of any pixel of the image and quality analysis report generation and printing. The SAR data Quality analysis application is built on an image processing library, called TELIMAGO, resulted from a research and development program, that provides to the application developers of a set of standard tools (including user-friendly interface objects, data input/output management, display management and data conversion tools), written in ANSI C language using OSF/Motif as graphical user interface, X Window System as graphic environment and UNIX as operating system. The SAR data Quality analysis application is essentially dedicated to SAR data users and investigators who want to decode ERS-1 data products, obtaining both image data and relevant ancillary data to be analyzed according to the SAR Quality Requirement Parameters, defined by European Space Agency. © 1994 SPIE. All rights reserved.

关键词： Synthetic aperture radar

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data QUALITY ISSUES IN visualIZATION

DATA QUALITY ISSUES IN VISUALIZATION

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conference on visual data exploration and analysis

作者： PANG, A FURMAN, J NUSS, W UNIV CALIF SANTA CRUZ SANTA CRUZCA 95064

ISBN: (纸本)0819414735

Recent efforts in visualization have concentrated on high volume data sets from numerical simulations and medical imaging. There is another large class of data, characterized by their spatial sparsity with noisy and possibly missing data points, that also need to be visualized. Two places where these type of data sets can be found are in oceanographic and atmospheric science studies. In such cases, it is not uncommon to have on the order on one percent of sampled data available within a space volume. Techniques that attempt to deal with the problem of filling in the holes range in complexity from simple linear interpolation to more sophisticated multiquadric and optimal interpolation techniques. These techniques will generally produce results that do not fully agree with each other. To avoid misleading the users, it is important to highlight these differences and make sure the users are aware of the idiosyncrasies of the different methods. This paper compares some of these interpolation techniques on sparse data sets and also discusses how other parameters such as confidence levels and drop-off rates may be incorporated into the visual display.

关键词： visualization Sensors Transparency data modeling Environmental sensing Medical imaging Meteorology Numerical simulations Wind measurement Atmospheric sciences

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USING STEREOSCOPIC IMAGING FOR visualIZATION APPLICATIONS

USING STEREOSCOPIC IMAGING FOR VISUALIZATION APPLICATIONS

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conference on visual data exploration and analysis

作者： ADELSON, SJ LOS ALAMOS NATL LAB LOS ALAMOSNM 87544

ISBN: (纸本)0819414735

The purpose of scientific visualization is to simplify the analysis of numerical data by rendering the information as an image. Even when the image is familiar, as in the case of terrain data, preconceptions about what the image should look like and deceptive image artifacts can create misconceptions about what information is actually contained in the scene. One way of aiding the development of unambiguous visualizations is to add stereoscopic depth to the image. Despite the recent proliferation of affordable stereoscopic viewing equipment, few researchers are at this time taking advantage of stereo in their visualizations. It is generally perceived that the rendering time will have to be doubled in order to generate the pair, and so stereoscopic viewing is sacrificed in the name of expedient rendering. We show that this perception is often invalid. The second half of a stereoscopic image can be generated from the first half for a fraction of the computational cost of complete rendering, usually no more than 50 percent of the cost and in many cases as little as 5 percent. Using the techniques presented here, the benefits of stereoscopy can be added to existing visualization systems for only a small cost over current single-frame rendering methods.

关键词： Stereoscopy visualization Scientific visualization Image visualization data modeling Volume rendering Eye 3D modeling Image enhancement Translucency

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OCT-TREE REPRESENTATION OF data SETS TO IDENTIFY RELATIONAL ATTRIBUTES SUBJECTED TO WELL-DEFINED CONSTRAINTS

OCT-TREE REPRESENTATION OF DATA SETS TO IDENTIFY RELATIONAL ...

引用

conference on visual data exploration and analysis

作者： BARKER, JM LIBURDY, KA LIBURDY, JA CLEMSON UNIV COLL ENGNCLEMSONSC 29634

ISBN: (纸本)0819414735

The physical interpretation of turbulent flow characteristics continues to be a major obstacle in the understanding and modelling of turbulence effects in the field of fluid mechanics. Turbulence modeling plays a major role in the predictive capabilities in engineering applications. Development of new and improved models require better understanding of the mechanism associated with turbulence. Some of the requirements of improved data interpretation include a systematic approach to establishing the relationship among various turbulence quantities at many different scales of interaction. In this paper is discussed some avenues that are thought to be appropriate methods of examining high Reynolds number turbulence in a manner that allows illustration and interpretation of both large and small scale phenomena. The general principle is the requirement to examine data at different levels of abstraction based on the functional relationships that vary through a designated hyper-space. Illustration is made of the enstrophy distribution which is concentrated in regions of high wave numbers. Results are shown for a three dimensional turbulent channel flow.

关键词： Turbulence visualization Spatial resolution Image segmentation Modeling Numerical simulations data processing Information visualization Mechanics Statistical analysis

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TEST data visualIZATION FOR OPEN SYSTEM STANDARDS

TEST DATA VISUALIZATION FOR OPEN SYSTEM STANDARDS

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conference on visual data exploration and analysis

作者： CRANE, D LEATHRUM, JF LIBURDY, KA CLEMSON UNIV SOFTWARE STAND & TECHNOL LABCLEMSONSC 29634

ISBN: (纸本)0819414735

This paper describes a data visualization tool developed to support prototype development and testing of software standard interfaces in the open systems environment. The visualization capability is an extension of the Clemson Automated Testing System (CATS). CATS is a research facility which has proven valuable in exposing and addressing critical issues in emerging areas such as the IEEE POSIX real-time extensions. Preliminary investigations with CATS involving real-time interfaces and statistical reasoning about large scenarios of tests has motivated the need for a data visualization capability. Current approaches to testing open systems interfaces include very limited visualization aids, such as 2D bar charts to represent statistical information about the test results. The visualization tool developed in this work extends these capabilities by introducing realism and abstraction via raytracing and hierarchical data representations. These capabilities support a more meaningful analysis of system behavior in that a new, more descriptive set of questions is possible. Experimental results achieved with CATS and the visualization of system behavior with respect to deadlines for real-time systems are presented. Future applications for the data visualization tool in the open systems standards arena are proposed.

关键词： visualization Computed tomography Standards development data visualization Human-machine interfaces Operating systems Interfaces Optical spheres Software development Statistical analysis

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COMPUTER-ASSISTED INDivIDUAL OSTEOTOMY DESIGN FOR MANDIBULAR RECONSTRUCTION

COMPUTER-ASSISTED INDIVIDUAL OSTEOTOMY DESIGN FOR MANDIBULAR...

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conference on visual data exploration and analysis

作者： ZEILHOFER, HF SADER, R HORCH, HH WUNDERLICH, AP KIRSTEN, R GERHARDT, P TECH UNIV MUNICH KLINIKUM MUND KIEFER GESICHTSCHIRURG KLIN & POLIKLINMUNICHGERMANY

ISBN: (纸本)0819414735

The complex structure and functional capacity of the mandible places high demands on the design for mandibular reconstructions for graft or transplant purposes. When using the crista iliac as a basis for grafts to bridge large defects, the graft is empirically shaped by the operator according to this experience, whereby it is often necessary to dissect and reconstruct it numerous times. A 3-D computer tomogram of the lower jaw and ilium is carried out on patients undergoing a planned mandible reconstruction. The 3-D CT data are processed in a workstation using a medical image analysis system. The ala of the ilium is superimposed over the region of the lower jaw which is to be replaced. This enables a coincidence of the structure of the lower jaw and the structure of the ilium crest to be formed to within an accuracy of one voxel - despite the complex three dimensional structure and distortions in all three spatial planes. In accordance with the computer simulation, the applicably shaped ilium crest is placed on the individually calculated donor site and transplanted in the resected section of the lower jaw. An exact reconstruction of the lower jaw bone is made possible using computer assisted individual osteotomy design, resulting in complete restoration regarding shape and functionality.

关键词： Bone Surgery Computed tomography data processing Tumors 3D image processing Computer simulations Image processing Medical imaging Bridges

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