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The effect of comparison cueing and exchange motion on comprehension of program visualizations 06

The effect of comparison cueing and exchange motion on compr...

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SOFTVIS 06: acm symposium on Software visualization

作者： Reed, Bina Rhodes, Philippa Kraemer, Eileen Hamilton-Taylor, Ashley Davis, Elizabeth Thorpe Hailston, Kenneth Computer Science Dept. University of Georgia School of Psychology Georgia Institute of Technology

ISBN: (纸本)1595934642

We describe an experiment that evaluates the effect of two attributes of an algorithm animation: presence of cueing (flashing) to indicate to the viewer that two data elements have been compared, and type of animation (arcing move or grow/shrink) to indicate that two data elements have exchanged values. We evaluate the impact of these attributes both on perception of the animated changes and on viewer comprehension of the depicted algorithm, as measured by the number of correctly answered questions in two question sets: "traditional" (comprehension) questions and "popup" (perception) questions. No significant effect on comprehension was observed for either flash cueing or exchange motion, though we note that comparison and exchange behaviors were redundantly cued in the animation studied. Signficant effects were found for flash cueing and "move" versus "grow" in the perceptual questions displayed in popup windows. © 2006 by the Association for Computing Machinery, Inc.

关键词： Data visualization

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3D contour perception for flow visualization 06

3D contour perception for flow visualization

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Ware, Colin University of New Hampshire

ISBN: (纸本)1595934294

One of the most challenging problems in data visualization is the perception of 3D flow fields because judging the orientation of 3D paths is perceptually difficult. It is hypothesized that perception of the orientations of streamlines in space can greatly benefit from stereoscopic depth cues and motion parallax. In addition, because stereoscopic depth perception is a super-acuity and relies on such factors as small-scale stereoscopic disparity gradient based on texture, stereoscopic depth judgments will be exceptionally sensitive to display quality. In conventional displays, the aliasing of pixels gives completely spurious texture information to the mechanisms of stereoscopic depth perception. We carried out a study to evaluate the importance of 3D cues in perceiving the orientation of curved contours. The result showed that stereo and motion cues are essential to perceiving the orientation of 3D lines. If, however, the contours are rendered as shaded tubes, good orientation information is available even without stereo or motion depth cues. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Flow visualization

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3D visualization technologies for teleguided robots

3D visualization technologies for teleguided robots

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13th acm symposium Virtual Reality Software and Technology, VRST'06

作者： Livatino, Salvatore Privitera, Filippo Medialogy Studies Aalborg University Copenhagen Denmark Scuola Superiore di Catania Catania Italy

ISBN: (纸本)1595933212

The use of 3D stereoscopic visualization may provide a user with higher comprehension of remote environments in teleoperation when compared to 2D viewing. Works in the literature have demonstrated how stereo vision contributes to improve perception of some depth cues often for abstract tasks, while little can be found about the advantages of stereoscopic visualization in mobile robot teleguide applications. This work investigates stereoscopic robot teleguide under different conditions, including typical navigation scenarios and the use of synthetic and real images. This work also inves-tigates how user performance may vary when employing different display technologies. Results from a set of test trials ran on five vir-tual reality systems emphasized few aspects which represent a base for further investigation as well as a guide when designing specific systems for telepresence. Copyright 2006 acm.

关键词： Robots

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Stevens dot patterns for 2D flow visualization 06

Stevens dot patterns for 2D flow visualization

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Tateosian, Laura G. Dennis, Brent M. Healey, Christopher G. Computer Science Department North Carolina State University

ISBN: (纸本)1595934294

This paper describes a new technique to visualize 2D flow fields with a sparse collection of dots. A cognitive model proposed by Kent Stevens describes how spatially local configurations of dots are processed in parallel by the low-level visual system to perceive orientations throughout the image. We integrate this model into a visualization algorithm that converts a sparse grid of dots into patterns that capture flow orientations in an underlying flow field. We describe how our algorithm supports large flow fields that exceed the capabilities of a display device, and demonstrate how to include properties like direction and velocity in our visualizations. We conclude by applying our technique to 2D slices from a simulated supernova collapse. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Flow visualization

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Optical flow, geometric field of view, and requested vehicle velocity 06

Optical flow, geometric field of view, and requested vehicle...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Mourant, Ronald R. Ahmad, Najla Adetiloye, Charles Jaeger, Beverly K. Virtual Environments Laboratory Northeastern University

ISBN: (纸本)1595934294

In a simulated driving scenario, we investigated the production of vehicle velocity at 30 and 60 mph while varying the amount of optical flow (roadside trees versus no trees) and the geometric field of view (25, 55, and 85 horizontal degrees). Participant drivers were significantly less accurate in producing vehicle velocities of 30 mph as contrasted with those of the 60 mph target set. On average, the produced velocities were overestimated by 20 mph for the 30 mph target set. This may be due to an inability of driving simulators to produce authentic optical flows when traversing at 30 mph or lower velocities. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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Enhancing interactive particle visualization with advanced shading models 06

Enhancing interactive particle visualization with advanced s...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Gribble, Christiaan P. Parker, Steven G. Scientific Computing and Imaging Institute School of Computing University of Utah

ISBN: (纸本)1595934294

Particle-based simulation methods are used to model a wide range of complex phenomena and to solve time-dependent problems of various scales. Effective visualization of the resulting state should communicate subtle changes in the three-dimensional structure, spatial organization, and qualitative trends within a simulation as it evolves. We take steps toward understanding and using advanced shading models in the context of interactive particle visualization. Specifically, the impact of ambient occlusion and physically based diffuse interreflection is investigated using a formal user study. We find that these shading models provide additional visual cues that enable viewers to better understand subtle features within particle datasets. We also describe a visualization process that enables interactive navigation and exploration of large particle datasets, rendered with illumination effects from advanced shading models. Informal feedback from application scientists indicates that the results of this process enhance the data analysis tasks necessary for understanding complex particle datasets. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Enhanced recovery

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The impact of immersive virtual reality displays on the understanding of data visualization

The impact of immersive virtual reality displays on the unde...

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13th acm symposium Virtual Reality Software and Technology, VRST'06

作者： Bayyari, Ahmed Tudoreanu, M. Eduard Department of Applied Science University of Arkansas at Little Rock Little Rock AR 72204 United States Department of Information Science University of Arkansas at Little Rock Little Rock AR 72204 United States

ISBN: (纸本)1595933212

This paper presents evidence that situational awareness in a visualization of data benefits from immersive, virtual reality display technology because such displays appear to support better understanding of the visual information. Our study was designed to de-emphasize perceptual and interaction characteristics of the dis-plays and found that the task of counting targets is strongly influenced by the type of system used to render the visualization. Immersive-type displays outperformed traditional monitors. The target objects in the study have distinguishing features that cannotmbe identified from a distance to alleviate the effect of perceptual differences among displays. Counting was chosen because it entails basic understanding of the relationship among the data values in order to recognize previously counted items. The display choices consisted of a traditional monitor and three configurations of an immersive, projection environment, obtained by selectively turning off one or two projectors of a three-wall CAVE. Copyright 2006 acm.

关键词： Virtual reality

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A reprocessing tool for quantitative data analysis in a virtual environment

A reprocessing tool for quantitative data analysis in a virt...

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13th acm symposium Virtual Reality Software and Technology, VRST'06

作者： Griffith, E.J. Koutek, M. Post, F.H. Heus, T. Jonker, H.J.J. Data Visualization Group Delft University of Technology Netherlands Department of Multi-Scale Physics Faculty of Applied Sciences Delft University of Technology Netherlands

ISBN: (纸本)1595933212

This paper presents an approach to help speed up and unify the exploration and analysis of time-dependent, volumetric data sets by easily incorporating new qualitative and quantitative information into an exploratory virtual environment (VE). The new information is incorporated through one or more expedited offline "reprocessing" steps, which compute properties of objects extracted from the data. These objects and their properties are displayed in the exploratory VE. A case study involving atmospheric data is presented to demonstrate the utility of the method. Copyright 2006 acm.

关键词： Virtual reality

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Color perception of 3D objects: Constancy with respect to variation of surface gloss 06

Color perception of 3D objects: Constancy with respect to va...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Xiao, Bei Brainard, David H. University of Pennsylvania

ISBN: (纸本)1595934294

What determines the color appearance of real objects viewed under natural conditions'? The light reflected from different locations on a single object can vary enormously. This variation is enhanced when the material properties of the object are changed from matte to glossy. Yet humans have no trouble assigning a color name to most things. We studied how people perceive the color of spheres in complex scenes. Observers viewed graphics simulations of a three-dimensional scene containing two spheres, test and match. The observer's task was to adjust the match sphere until its color appearance was the same as that of the test sphere. The match sphere was always matte, and observers varied its color by changing the simulated spectral reflectance function. The surface gloss of the test spheres was varied across conditions. The data show that for fixed test sphere body reflectance, color appearance depends on surface gloss. This effect is small, however, compared to the variation that would be expected if observers simply matched the average of the light reflected from the test. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Three dimensional computer graphics

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Keyframe control of complex particle systems using the adjoint method 5

Keyframe control of complex particle systems using the adjoi...

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5th acm siggraph / Eurographics symposium on Computer Animation, SCA 2006

作者： Wojtan, Chris Mucha, Peter J. Turk, Greg Graphics Visualization and Usability Laboratory Georgia Institute of Technology Atlanta30332 United States Department of Mathematics Institute for Advanced Materials University of North Carolina Chapel Hill27599 United States

ISBN: (纸本)3905673347

Control of physical simulation has become a popular topic in the field of computer graphics. Keyframe control has been applied to simulations of rigid bodies, smoke, liquid, flocks, and finite element-based elastic bodies. In this paper, we create a framework for controlling systems of interacting particles-paying special attention to simulations of cloth and flocking behavior. We introduce a novel integrator-swapping approximation in order to apply the adjoint method to linearized implicit schemes appropriate for cloth simulation. This allows the control of cloth while avoiding computationally infeasible derivative calculations. Meanwhile, flocking control using the adjoint method is significantly more efficient than currently-used methods for constraining group behaviors, allowing the controlled simulation of greater numbers of agents in fewer optimization iterations. © 2016 The Eurographics Association.

关键词： Smoke

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