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检索条件"任意字段=Symposium on Applied Perception in Graphics and Visualization, APGV 2008"

共 134 条记录，以下是11-20 订阅

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Peripheral visual information and its effect on distance judgments in virtual and augmented environments 11

Peripheral visual information and its effect on distance jud...

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8th Annual symposium on applied perception in graphics and visualization, apgv 2011

作者： Jones, J. Adam Swan II, J. Edward Singh, Gurjot Ellis, Stephen R. Mississippi State University United States NASA Ames Research Center United States

ISBN: (纸本)9781450308892

A frequently observed problem in medium-field virtual environments is the underestimation of egocentric depth. This problem has been described numerous times and with widely varying degrees of severity, and although there has been considerable progress made in modifying observer behavior to compensate for these misperceptions, the question of why these errors exist is still an open issue. This paper presents the findings of a series of experiments, comprising 103 participants, that attempts to identify and quantify the source of a pattern of adaptation and improved depth judgment accuracy over time scales of less than one hour. Taken together, these experiments suggest that peripheral visual information is an important source of information for the calibration of movement within mediumfield virtual environments. © 2011 ACM.

关键词： Depth perception

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Evaluation of video artifact perception using event-related potentials 11

Evaluation of video artifact perception using event-related ...

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8th Annual symposium on applied perception in graphics and visualization, apgv 2011

作者： Lindemann, Lea Wenger, Stephan Magnor, Marcus Computer Graphics Lab TU Braunschweig Germany

ISBN: (纸本)9781450308892

When new computer graphics algorithms for image and video editing, rendering or compression are developed, the quality of the results has to be evaluated and compared. Since the produced media are usually to be presented to an audience it is important to predict image and video quality as it would be perceived by a human observer. This can be done by applying some image quality metric or by expensive and time consuming user studies. Typically, statistical image quality metrics do not correlate to quality perceived by a human observer. More sophisticated HVS-inspired algorithms often do not generalize to arbitrary images. A drawback of user studies is that perceived image or video quality is filtered by a decision process, which, in turn, may be influenced by the performed task and chosen quality scale. To get an objective view on (subjectively) perceived image quality, electroencephalography can be used. In this paper we show that artifacts appearing in videos elicit a measurable brain response which can be analyzed using the event-related potentials technique. Since electroencephalography itself requires an elaborate procedure, we aim to find a minimal setup to reduce time and participants needed to conduct a reliable study of image and video quality. As a first step we demonstrate that the reaction to a video with or without an artifact can be identified by an off-the-shelf support vector machine, which is trained on a set of previously recorded responses, with a reliability of up to 80% from a single recorded electroencephalogram. © 2011 ACM.

关键词： Electroencephalography

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Egocentric distance perception in real and HMD-based virtual environments: The effect of limited scanning method

Egocentric distance perception in real and HMD-based virtual...

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8th Annual symposium on applied perception in graphics and visualization, apgv 2011

作者： Lin, Qiufeng Xie, Xianshi Erdemir, Aysu Narasimham, Gayathri McNamara, Timothy P. Rieser, John Bodenheimer, Bobby Vanderbilt University United States

ISBN: (纸本)9781450308892

We conducted four experiments on egocentric depth perception using blind walking with a restricted scanning method in both the real and a virtual environment. Our viewing condition in all experiments was monocular. We varied the field of view (real), scan direction (real), blind walking method (real and virtual), and selfrepresentation (virtual) over distances of 4 meters to 7 meters. The field of view varied between 21.1° and 13.6°. The scan direction varied between near-to-far scanning and far-to-near scanning. The blind walking method varied between direct blind walking and an indirect method of blind walking that matched the geometry of our laboratory. We varied self-representation between having a selfavatar (a fully tracked, animated, and first-person perspective of the user), having a static avatar (a mannequin avatar that did not move), to having no avatar (a disembodied camera view of the virtual environment). In the real environment, we find an effect of field of view;participants performed more accurately with larger field of view. In both real and virtual environments, we find an effect of blind walking method;participants performed more accurately in direct blind walking. We do not find an effect of distance underestimation in any environment, nor do we find an effect of self-representation. © 2011 ACM.

关键词： Virtual reality

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Active control does not eliminate motion-induced illusory displacement 11

Active control does not eliminate motion-induced illusory di...

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8th Annual symposium on applied perception in graphics and visualization, apgv 2011

作者： Caniard, Franck Bülthoff, Heinrich H. Mamassian, Pascal Lee, Seong-Whan Thornton, Ian M. Max Planck Institute for Biological Cybernetics Tübingen Germany Max Planck Institute for Biological Cybernetics Department of Brain and Cognitive Engineering Korea University Korea Republic of Laboratoire Psychologie de la Perception Université Paris Descartes Paris France Department of Brain and Cognitive Engineering Korea University Seoul Korea Republic of Psychology Department Swansea University Swansea United Kingdom

ISBN: (纸本)9781450308892

When the sine-wave grating of a Gabor patch drifts to the left or right, the perceived position of the entire object is shifted in the direction of local motion. In the current paper, we explored whether active control of the physical position of the patch can overcome such motion induced illusory displacement. We created a simple computer game and asked participants to continuously guide a Gabor patch along a randomly curving path. When the grating inside the Gabor patch was stationary, participants could perform this task without error. When the grating drifted to either left or right, we observed systematic errors consistent with previous reports of motion-induced illusory displacement. Specifically, when the grating drifted to the right, participants adjusted the global position of the patch to the left of the target line, and when it drifted to the left, errors were to the right of the line. The magnitude of the errors was consistent with previously reported perceptual judgements for centrally presented items, and scaled systematically with the speed of local drift. Importantly, we found no evidence that participants could adapt or compensate for illusory displacement given active control of the target. The current findings could have important implications for interface design, suggesting that local dynamic components of a display could affect perception and action within the more global application environment. © 2011 ACM.

关键词： Systematic errors

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Proceedings - apgv 2009: symposium on applied perception in graphics and visualization

Proceedings - APGV 2009: Symposium on Applied Perception in ...

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apgv 2009: symposium on applied perception in graphics and visualization

ISBN: (纸本)9781605587431

The proceedings contain 33 papers. The topics discussed include: distance perception in virtual environments: a closer look at the horizon and the error;distance perception in NPR immersive virtual environments, revisited;display size does not affect egocentric distance perception of naturalistic stimuli;transitional environments enhance distance perception in immersive virtual reality systems;effects of scale change on distance perception in virtual environments;using immersive virtual reality to evaluate pedestrian street crossing decisions at a roundabout;the interaction between motion and form in expression recognition;screen-space perceptual rendering of human skin;video viewing preferences for HDR displays under varying ambient illumination;display considerations for night and low-illumination viewing;and evaluation of glyph-based multivariate scalar volume visualization techniques.

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Proceedings - apgv 2009: symposium on applied perception in graphics and visualization: Preface

Proceedings - APGV 2009: Symposium on Applied Perception in ...

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Proceedings - apgv 2009: symposium on applied perception in graphics and visualization 2009年 6-6页

作者： Bodenheimer, Bobby Mania, Katerina Cunningham, Douglas W. Vanderbilt University Carol O'Sullivan Trinity College Dublin Technical University of Crete Bernhard Riecke Simon Fraser University MPI for Biological Cybernetics

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Perceptual evaluation of illumination effects in virtual environments 10

Perceptual evaluation of illumination effects in virtual env...

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7th Annual symposium on applied perception in graphics and visualization, apgv 2010

作者： Raya, Laura Mata, Susana Robles, Óscar D. Universidad Rey Juan Carlos Spain

In this work, different techniques for the generation of shadows and reflections have been compared in terms of the perceived quality by the final user. Results show that, for the analyzed scenarios, users do not pres... 详细信息

ISBN: (纸本)9781450302487

关键词： perception reflections hard shadow soft shadow

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3D visualization of archaeological uncertainty 10

3D visualization of archaeological uncertainty

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7th Annual symposium on applied perception in graphics and visualization, apgv 2010

作者： Sifniotis, M. Jackson, B. Mania, K. Vlassis, N. Watten, P.L. White, M. Univ. of Sussex United Kingdom Univ. of Kingston United Kingdom Technical Univ. of Crete Greece

ISBN: (纸本)9781450302487

By uncertainty, we define an archaeological expert's level of confidence in an interpretation deriving from gathered evidence. Archaeologists and computer scientists have urged caution in the use of 3D for archaeological reconstructions because the availability of other possible hypotheses is not always being acknowledged. This poster presents a 3D visualization system of archaeological uncertainty.

关键词： visualization

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Influence of step frequency on visual speed perception during locomotion 10

Influence of step frequency on visual speed perception durin...

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7th Annual symposium on applied perception in graphics and visualization, apgv 2010

作者： Casey, Rachael Pelah, Adar Cameron, Jonathan Lasenby, Joan University of Cambridge United Kingdom University of York United Kingdom

ISBN: (纸本)9781450302487

[Thurrell et al. 1998] first observed that the perceived speed of optic flow decreases in linear proportion to the increasing physical speed of locomotion on a treadmill and proposed this as a mechanism to discount from the visual signal retinal motion due to self-motion, described as an arthrovisual effect [Thurrell and Pelah 2005]. Since human locomotion consists of a complex of articulated movement, step parameters and associated afferent, efferent and efference copy signals, questions arise as to the relative contributions of these component messages to the reduction in the perception of optic flow speed (POFS). Here we report experiments [Casey 2010] on the role of step frequency (SF) previously proposed as a reliable estimate for perception of the speed of self-motion [Durgin et al. 2007;Dong et al. 2008].

关键词： Virtual reality

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Perceptual principles for scalable sequence alignment visualization 10

Perceptual principles for scalable sequence alignment visual...

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7th Annual symposium on applied perception in graphics and visualization, apgv 2010

作者： Albers, Danielle Gleicher, Michael University of Wisconsin Madison United States

ISBN: (纸本)9781450302487

Sequence comparison is a fundamental task in the biological sciences. Scientists often need to understand the similarities and differences between genetic sequences to understand evolution, to infer common function, or identify differences. Because the sequences are too long for manual examination, scientists rely on alignment tools that automatically identify subsequences that match between the sequences being compared. Numerous approaches for displaying and exploring alignments exist, and have been incorporated into a wide variety of tools. See [Procter et al. 2010] for a survey of several existing approaches.

关键词： Biology

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