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检索条件"任意字段=Symposium on Applied Perception in Graphics and Visualization"

共 152 条记录，以下是71-80 订阅

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perception-motivated Interpolation of Image Sequences 08

Perception-motivated Interpolation of Image Sequences

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symposium on applied perception in graphics and visualization

作者： Stich, Timo Linz, Christian Wallraven, Christian Cunningham, Douglas Magnor, Marcus TU Braunschweig Braunschweig Germany

ISBN: (纸本)9781595939814

We present a method for image interpolation which is able to create high-quality, perceptually convincing transitions between recorded images. By implementing concepts derived from human vision, the problem of a physically correct image interpolation is relaxed to an image interpolation that is perceived as physically correct by human observers. We find that it suffices to focus on exact edge correspondences, homogeneous regions and coherent motion to compute such solutions. In our user study we confirm the visual quality of the proposed image interpolation approach. We show how each aspect of our approach increases the perceived quality of the interpolation results, compare the results obtained by other methods and investigate the achieved quality for different types of scenes.

关键词： perception morphing image interpolation

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Quantifying Usability in Secure graphics: Assessing the User Costs of Protecting 3D Content 08

Quantifying Usability in Secure Graphics: Assessing the User...

引用

symposium on applied perception in graphics and visualization

作者： Zhu, Jiajun Bakdash, Jonathan Z. Koller, David Banton, Thomas Proffitt, Dennis R. Humphreys, Greg Univ Virginia Dept Comp Sci Charlottesville VA 22903 USA Univ Virginia Dept Psychol Charlottesville VA 22903 USA

ISBN: (纸本)9781595939814

There is an increasing need for methods for secure dissemination of interactive 3D graphics content, providing protection for valuable 3D models while still allowing them to be widely shared. Existing systems for protected sharing of 3D models may introduce perturbations into the rendered images of the content, in order to defend against potential malicious reconstruction attacks that could otherwise recover the 3D model shape. However, the particular nature and magnitude of these perturbation defenses has not been based upon any rigorous analysis or measurement of their perceptual effect on non-malicious users of the protected graphics system. In this paper, we take the first steps toward such an analysis, conducting a series of user studies that evaluate the impact (as measured by user reaction time) of varying amounts of noise applied to user interactions in a real-time 3D rendering system. We are thus able to experimentally determine the most appropriate tradeoffs between noise perturbation defenses and the security of the 3D content against typical reconstruction attacks.

关键词： secure graphics perception usability 3D reconstruction

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Comprehending Boolean Queries 08

Comprehending Boolean Queries

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symposium on applied perception in graphics and visualization

作者： Huo, Jiwen Cowan, Win Univ Waterloo David R Cheriton Sch Comp Sci Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781595939814

Data selection is an integral part of information visualization. It almost universally incorporates Boolean logic in some way, despite the known difficulties of Boolean concepts for users. As a result many different visual interfaces have been proposed for specifying or displaying Boolean queries. In general they are tested experimentally, and though the results are usually promising, they normally show only that one interface is better or worse than another, but not why this is so. This paper describes a new experimental methodology for evaluating query interfaces, which uses stimulus onset asynchrony to separate different aspects of query comprehension. We used it to evaluate a new visual query interface based on Karnaugh maps and discovered that there are two qualitatively different approaches to comprehension, deductive and inductive. The Karnaugh map representation scales extremely well with query complexity, and the experiments show that its good scaling properties occur because it strongly facilitates inductive comprehension.

关键词： visualization stimulus onset asynchrony Boolean query evaluation visual query

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HMD calibration and its effects on distance judgments 08

HMD calibration and its effects on distance judgments

引用

symposium on applied perception in graphics and visualization

作者： Kuhl, Scott A. Thompson, William B. Creem-Regehr, Sarah H. Univ Utah Salt Lake City UT 84112 USA

ISBN: (纸本)9781595939814

Most head-mounted displays (HMDs) suffer from substantial optical distortion, and vendor-supplied specifications for field-of-view often are at variance with reality. Such displays do not present perspective-related visual cues in a geometrically correct manner, which has the potential to affect applications of HMDs which depend on precise spatial perception. This paper provides empirical evidence for the degree to which these resulting distortions affect one type of spatial judgment in virtual environments. We show that minification in the HMD that would occur from an overstated HMD field of view results in a significant change in distance judgments. Incorrectly calibrated pitch and pincushion distortion, however, did not cause statistically significant changes in distance judgments for the degree of distortions examined. While the means for determining the optical distortion of display systems are well known, they are often not used in non-see-through HMDs due to problems in measuring and correcting for distortion. As a result, we also provide practical guidelines for creating geometrically calibrated systems.

关键词： immersive virtual environment perception minification field of view pincushion distortion pitch

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Effect of Scenario on Perceptual Sensitivity to Errors in Animation 08

Effect of Scenario on Perceptual Sensitivity to Errors in An...

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symposium on applied perception in graphics and visualization

作者： Reitsma, Paul S. A. O'Sullivan, Carol Trinity Coll Dublin Dublin Ireland

ISBN: (纸本)9781595939814

A deeper understanding of what makes animation perceptually plausible would benefit a number of applications, such as approximate collision detection and goal-directed animation. In a series of psychophysical experiments, we examine how measurements of perceptual sensitivity in realistic physical simulations compare to similar measurements done in more abstract settings. We find that participant tolerance for certain types of errors is significantly higher in a realistic snooker scenario than in the abstract test settings previously used to examine those errors. By contrast, we find there is no difference in tolerance vs. the abstract setting when those errors are displayed in a realistic but more neutral environment. Additionally, we examine the interaction of auditory and visual cues in determining participant sensitivity to spatiotemporal errors in rigid body collisions. We find that participants are predominantly affected by visual cues. Finally, we find that tolerance for spatial gaps during collision events is constant for a wide range of viewing angles if the effect of foreshortening and occlusion caused by the viewing angle is taken into account.

关键词： psychophysics animation perception

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A full-body avatar improves egocentric distance judgments in an immersive virtual environment 08

A full-body avatar improves egocentric distance judgments in...

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symposium on applied perception in graphics and visualization

作者： Mohler, Betty J. Buelthoff, Heinrich H. Thompson, William B. Creem-Regehr, Sarah H. Max Planck Inst Biol Cybernet D-72076 Tubingen Germany

ISBN: (纸本)9781595939814

A number of investigators have reported that distance judgments in virtual environments (VEs) are systematically smaller than distance judgments made in comparably-sized real environments. Many variables that may contribute to this difference have been investigated but none of them fully explain the distance compression. In this paper we asked whether seeing a fully-articulated visual representation of oneself (avatar) within a virtual environment would lead to more accurate estimations of distance. We found that participants who explored near space without the visual avatar underestimated egocentric distance judgments compared to those who similarly explored near space while viewing a fully-articulated avatar. These results are discussed with respect to the perceptual and cognitive mechanisms that may be involved in the observed effects as well as the benefits of visual feedback in the form of an avatar for VE applications.

关键词： virtual environments spatial perception avatars

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The perceptual influences on gait transition of step parameters and optic flow in virtual environment locomotion simulators 08

The perceptual influences on gait transition of step paramet...

引用

symposium on applied perception in graphics and visualization

作者： Dong, Huan Pelah, Adar Cameron, Jonathan Lasenby, Joan Univ Cambridge Cambridge CB2 1TN England

ISBN: (纸本)9781595939814

Simulation of natural locomotion in virtual environments requires an understanding of self-motion perception derived from both gait and sensory parameters. The walk-run transition (WRT) is a clearly-defined physical gait descriptor that emerges largely from a user's assessment of their own speed. The WRT depends not only on the biomechanics, kinetics and energetics of gait, but also on perceptual and cognitive factors, such as optic flow [Mohler et al. 2004;2007], attention [Pelah et al 2006] and step frequency [Durgin et al 2007]. To further investigate gait transitions and the mechanisms for perception of self motion speed, 15 subjects were required to advance at prescribed step frequencies with increasing speeds on a treadmill, with or without optic flow, in a large-screen virtual environment. WRT speed reached its highest value at approximately 145 steps/min (0.61 Fr) for all conditions, decreasing at higher step frequencies. Above this frequency, optic flow reduced WRT speeds as step frequency increased, suggesting an enhancement of visuomotor interactions in locomotion simulators due to step frequency being forced beyond the natural step frequency range.

关键词： Locomotion gait step frequency perception optic flow walk-run transition virtual environments

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The Assumed Light Direction for Perceiving Shape from Shading 08

The Assumed Light Direction for Perceiving Shape from Shadin...

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symposium on applied perception in graphics and visualization

作者： O'Shea, James P. Banks, Martin S. Agrawala, Maneesh Univ Calif Berkeley Berkeley CA 94720 USA

ISBN: (纸本)9781595939814

Recovering 3D shape from shading is an ill-posed problem that the visual system can solve only by making use of additional information such as the position of the light source. Previous research has shown that people tend to assume light is above and slightly to the left of the object [Sun and Perona 1998]. We present a study to investigate whether the visual system also assumes the angle between the light direction and the viewing direction. We conducted a shape perception experiment in which subjects estimated surface orientation on smooth, virtual 3D shapes displayed monocularly using local Lambertian shading without cast shadows. We varied the angle between the viewing direction and the light direction within a range +/- 66 deg (above/below), and subjects indicated local surface orientation by rotating a gauge figure to appear normal to the surface [Koenderink et al. 1992]. Observer settings were more accurate and precise when the light was positioned above rather than below the viewpoint. Additionally, errors were minimized when the angle between the light direction and the viewing direction was 20-30 deg. Measurements of surface slant and tilt error support this result. These findings confirm the light-from-above prior and provide evidence that the angle between the viewing direction and the light direction is assumed to be 20-30 deg above the viewpoint.

关键词： Shape-from-shading light-from-above shape perception Lambertian shading

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Ensemble-space visualization improves perception of 3D state of molecular dynamics simulation 08

Ensemble-space visualization improves perception of 3D state...

引用

symposium on applied perception in graphics and visualization, APGV 2008

作者： Huff, Israel Weigle, Chris Banks, David C. University of Tennessee Knoxville United States UT/ORNL Joint Institute for Computational Sciences University of Tennessee Knoxville United States

ISBN: (纸本)9781595939814

Large-scale molecular dynamics (MD) simulations are some of the primary applications running on today's supercomputers. These simulations frequently compute the interactions of millions of atoms over millions of time steps, and petascale simulations will target billion atom simulations in the near future. Visualizing the state of such large-scale simulations poses a significant challenge for both data reduction and perception. Standard tools for 3D visualization of MD simulations - such as direct visualization ofthe molecules in their simulated physical arrangement - eventually grow so dense (with more atoms than screen pixels) that only thevolumetric shape of the simulation domain is apparent, rather than its detailed content. In this paper, we describe a method for visualizing simulations of a compound in bulk which we refer to as the ensemble display. An ensemble display is produced by superimposing molecular neighborhoods onto fixed reference molecules. This results in a 3D visualization which preserves inter-molecular distances andangles between pairs of molecules while greatly reducing the visual complexity. We performed human-subjects experiments to test the hypothesis that subjects could deduce a bulk physical property of the simulation (temperature) from the ensemble display more accurately than from other common visualizations of MD simulation. Our results show that temperature estimates under the ensemble display had the least error of the tested visualization techniques. © 2008 ACM.

关键词： Molecular dynamics

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Distance perception in Virtual Environments 08

Distance Perception in Virtual Environments

引用

symposium on applied perception in graphics and visualization

作者： Williams, Betsy Johnson, Derek Shores, Lucy Narasimham, Gayathri Rhodes Coll Memphis TN 38112 USA Vanderbilt Univ Nashville TN 37235 USA

ISBN: (纸本)9781595939814

Virtual environments provide people with the opportunity to experience places and situations remote from their actual physical surroundings. However, we cannot expect spatial representation in virtual environments to be as accurate as spatial representation in physical environments. One reason for this is that perceived distance is systematically underestimated in virtual environments. The precise reasons for this are unknown. This work uses the bisection method shown in Bodenheimer et al. [2007] to study the perceived distance in virtual environments. In the virtual environment, distance bisection involves subjects adjusting an avatar using a joystick until they feel that the avatar bisects the distance between themselves and a target avatar. Bodenheimer et al. [2007] examine errors resulting from judging the bisection at 15m and 30m. We examine errors resulting from judging the bisection from five different distances: 3m, 7.5m, 15m, 22.5m, and 30m. We observe a linear relationship between the amount of foreshortening in judging the midpoint and distance. Additionally, perceiving a virtual representation of one's self in the virtual environment makes subjects significantly more accurate at judging the midpoint at 3m. However, for distances greater than 7.5m we find that asking people to use their virtual representation to judge the bisection leads to a significant increase in the amount of foreshortening.

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