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1992 IEEE Workshop on Visual Languages, VL 1992

作者： Stasko, J.T. Patterson, C. Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology AtlantaGA30332-0280 United States

ISBN: (纸本)0818630906

The general term software visualization refers to graphical views or illustrations of the entities and characteristics of computer programs and algorithms. This term along with many others including data structure display, program animation, algorithm animation, etc., have been used inconsistently in the literature, which has led to confusion in describing systems providing these capabilities. This paper presents a scaled characterization of software visualization terms along aspect, abstractness, animation, and automation dimensions. Rather than placing existing systems into hard-and-fast categories, it focuses on unique and differentiating aspects across all systems. © 1992 IEEE.

关键词： Animation

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Double exponential smoothing: An alternative to Kalman filter-based predictive tracking

Double exponential smoothing: An alternative to Kalman filte...

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9th EUROGRAPHICS Workshop on Virtual Environments, EGVE 2003

作者： LaViola Jr., Joseph J. Brown University Technology Center for Advanced Scientific Computing and Visualization PO Box 1910 Providence RI 02912 United States

ISBN: (纸本)1581136862

We present novel algorithms for predictive tracking of user position and orientation based on double exponential smoothing. These algorithms, when compared against Kalman and extended Kalman filter-based predictors with derivative free measurement models, run approximately 135 times faster with equivalent prediction performance and simpler implementations. This paper describes these algorithms in detail along with the Kalman and extended Kalman Filter predictors tested against. In addition, we describe the details of a predictor experiment and present empirical results supporting the validity of our claims that these predictors are faster, easier to implement, and perform equivalently to the Kalman and extended Kalman filtering predictors. © 2003 The Eurographics Association.

关键词： Extended Kalman filters

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Automatic chunk detection in human-computer interaction 94

Automatic chunk detection in human-computer interaction

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Workshop on Advanced Visual Interfaces, AVI 1994

作者： Santos, Paulo J. Badre, Albert N. Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA 30332-0280 United States

ISBN: (纸本)0897917332

This paper describes an algorithm to detect user's mental chunks by analysis of pause lengths in goal-directed human-computer interaction. Identifying and characterizing users' chunks can help in gauging the users' level of expertise. The algorithm described in this paper works with information collected by an automatic logging mechanism. Therefore, it is applicable to situations in which no human intervention is required to perform the analysis, such as adaptive interfaces. An empirical study was conducted to validate the algorithm, showing that mental chunks and their characteristics can indeed be inferred from an analysis of human-computer interaction logs. Users performing a variety of goal-directed tasks were monitored. Using an automated logging tool, every command invoked, every operation performed with the input devices, as well as all system responses were recorded. Analysis of the interaction logs was performed by a program that implements a chunk detection algorithm that looks at command sequences and timings. The results support the hypothesis that a significant number of user mental chunks can be detected by our algorithm. © 1994 ACM.

关键词： Human computer interaction

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A testbed for studying and choosing predictive tracking algorithms in virtual environments

A testbed for studying and choosing predictive tracking algo...

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9th EUROGRAPHICS Workshop on Virtual Environments, EGVE 2003

作者： LaViola Jr., Joseph J. Brown University Technology Center for Advanced Scientific Computing and Visualization PO Box 1910 Providence RI 02912 United States

ISBN: (纸本)1581136862

We present a testbed for comparing predictive tracking algorithms that allows virtual environment system developers to make better choices about which predictors to use in their environments and aids researchers in determining how predictors work across various virtual environment configurations. Our testbed saves the virtual environment developer and researcher both time and effort with the important task of reducing dynamic tracking error and masking latency. The testbed consists of three components: a prediction algorithm library, a motion data repository, and a graphical testing application which provides users with the ability to test different predictive tracking algorithms across a variety of user motion sequences. The testbed provides enough generality for testing across different algorithmic and system parameters such as sampling rate, prediction time, and noise variance. The paper describes the contents of the predictor library and how to extend it, the types of motion data sets collected thus far, the motion data preparation methodology, and the graphical testing application's functionality and architecture. A simple testing scenario showing output from the testbed is also presented. © 2003 The Eurographics Association.

关键词： Testbeds

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Co-opting everyday objects 00

Co-opting everyday objects

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2000 Conference on Designing Augmented Reality Environments, DARE 2000

作者： Mynatt, Elizabeth D. Everyday Computing Lab Graphics Visualization and Usability Center Georgia Institute of Technology AtlantaGA30332-0280 United States

No abstract available.

ISBN: (纸本)9781450373265

No abstract available.

关键词： augmented reality visualization ubiquitous computing audio ligh-weight interaction awareness

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Animating user interfaces using animation servers 93

Animating user interfaces using animation servers

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6th Annual ACM Symposium on User Interface Software and Technology, UIST 1993

作者： Bharat, Krishna Sukaviriya, Piyawadee Noi Graphics Visualization and Usability Center College of Computing Atlantic Drive Georgia Institute of Technology AtlantaGA30332 United States

ISBN: (纸本)089791628X

Our approach to user interface animation involves simulating the interaction of a user with the interface by synthetically generating the input events that drive the session. The interaction is made explicit by displaying the behavior of input devices audio-visually. Such "animation" is both educational and functional, and has the potential to become a powerful new medium in the graphical user interface domain. We describe the construction of a general purpose tool for animating user interfaces - the animation server. Clients drive the server with textual scripts that describe the interaction. These may contain constructs for obtaining application context information at runtime and synchronizing with other media servers. We present a few potential applications for animation servers, including a groupware package for loosely coupled collaboration.

关键词： Animation

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A Methodology for Integrating Population Health Surveys Using Spatial Statistics and visualizations for Cross-Sectional Analysis

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SN Computer Science 2023年第3期4卷 224页

作者： Ravindra, Harshitha Sreevalsan-Nair, Jaya Graphics-Visualization-Computing Lab E-Health Research Center IIIT Bangalore 26/C Electronics City Hosur Road Karnataka Bangalore 560100 India

Large-scale population surveys are beneficial in gathering information on the performance indicators of public well-being, including health and socio-economic standing. However, conducting national population surveys for low and middle-income countries (LMIC) with high population density comes at a high economic cost. To conduct surveys at low-cost and efficiently, multiple surveys with different, but focused, goals are implemented through various organizations in a decentralized manner. Some of the surveys tend to overlap in outcomes with spatial, temporal or both scopes. Mining data jointly from surveys with significant overlap gives new insights while preserving their autonomy. We propose a three-step workflow for integrating surveys using spatial analytic workflow supported by visualizations. We implement the workflow on a case study using two recent population health surveys in India to study malnutrition in children under-five. Our case study focuses on finding hotspots and coldspots for malnutrition, specifically undernutrition, by integrating the outcomes of both surveys. Malnutrition in children under-five is a pertinent global public health problem that is widely prevalent in India. Our work shows that such an integrated analysis is beneficial alongside independent analyses of such existing national surveys to find new insights into national health indicators. © 2023, The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd.

关键词： Anemia Hellinger distance Large-scale surveys Micronutrient deficiency Multi-source data fusion Spatial analysis Spatial autocorrelation Stunting Underweight visualization Wasting

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End-to-end data reduction and hardware accelerated rendering techniques for visualizing time-varying non-uniform grid volume data

End-to-end data reduction and hardware accelerated rendering...

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Fourth International Workshop on Volume Graphics 2005

作者： Akiba, Hiroshi Ma, Kwan-Liu Clyne, John Institute for Data Analysis and Visualization University of California Davis United States Scientific Computing Devision National Center for Atmospheric Research CO United States

ISBN: (纸本)3905673266

We present a systematic approach for direct volume rendering terascale-sized data that are time-varying, and possibly non-uniformly sampled, using only a single commodity graphics PC. Our method employs a data reduction scheme that combines lossless, wavelet-based progressive data access with a user-directed, hardware-accelerated data packing technique. Data packing is achieved by discarding data blocks with values outside the data interval of interest and encoding the remaining data in a structure that can be efficiently decoded in the GPU. The compressed data can be transferred between disk, main memory, and video memory more efficiently, leading to more effective data exploration in both spatial and temporal domains. Furthermore, our texture-map based volume rendering system is capable of correctly displaying data that are sampled on a stretched, Cartesian grid. To study the effectiveness of our technique we used data sets generated from a large solar convection simulation, computed on a non-uniform, 504×504×2048 grid. © The Eurographics Association 2005.

关键词： Data reduction

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Time Critical Isosurface Refinement and Smoothing

Time Critical Isosurface Refinement and Smoothing

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IEEE Symposium on Volume visualization, VV 2000

作者： Bajaj, C.L. Pascucci, V. Center for Applied Scientific Computing Lawrence Livermore National Laboratory United States Center for Computational Visualization CS and TICAM University of Texas AustinTX United States

ISBN: (纸本)1581133081

Multi-resolution data-structures and algorithms are key in visualization to achieve real-time interaction with large data-sets. Research has been primarily focused on the off-line construction of such representations mostly using decimation schemes. Drawbacks of this class of approaches include: (i) the inability to maintain interactivity when the displayed surface changes frequently, (ii) inability to control the global geometry of the embedding (no self-intersections) of any approximated level of detail of the output surface. In this paper we introduce a technique for on-line construction and smoothing of progressive isosurfaces (see Figure 1). Our hybrid approach combines the flexibility of a progressive multi-resolution representation with the advantages of a recursive subdivision scheme. Our main contributions are: (i) a progressive algorithm that builds a multi-resolution surface by successive refinements so that a coarse representation of the output is generated as soon as a coarse representation of the input is provided, (ii) application of the same scheme to smooth the surface by means of a 3D recursive subdivision rule, (iii) a multi-resolution representation where any adaptively selected level of detail surface is guaranteed to be free of self-intersections. © 2000 IEEE.

关键词： Data structures

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Navigational view builder: A tool for building navigational views of information spaces 94

Navigational view builder: A tool for building navigational ...

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Conference on Human Factors in computing Systems, CHI 1994

作者： Mukherjea, Sougata Foley, James D. Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

ISBN: (纸本)0897916514

Overview node and link diagrams are one of the best tools for context and orientation in hypermedia systems. To be really effective these need to show not only the node and link topology but more information about the underlying information space. The Navigational View Builder allows the designer or the user to control the dynamic binding between the visual properties of the overview diagrams and the underlying information. Dynamic binding can also be used for forming fish-eye views. Finally, by combining this method with force-based graph-drawing algorithms, visual clusters of related nodes based on various similarity metrics can be formed. © 1994 ACM.

关键词： Hypermedia systems

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