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检索条件"任意字段=APGV 2009: Symposium on Applied Perception in Graphics and Visualization"

共 139 条记录，以下是11-20 订阅

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Realistic simulation of human contrast perception after headlight glares in driving simulations 11

Realistic simulation of human contrast perception after head...

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

作者： Meyer, B. Gonter, M. Grunert, C. Thomschke, S. Vollrath, M. Magnor, M. Computer Graphics Lab. TU Braunschweig Mühlenpfordtstr. 23 38106 Braunschweig Germany Volkswagen AG Konzernforschung Hermann-Münch-Str. 1 38440 Wolfsburg Germany Volkswagen AG Research and Development Lighting and Vision Letterbox 011/15820 38436 Wolfsburg Germany Cognitive Psychology TU Braunschweig Gaussstr. 23 38106 Braunschweig Germany

ISBN: (纸本)9781450308892

The aim of this work is to enable the simulation of the experience of short-time glare effects in a driving simulator by adjusting the display contrast according to human perception. The simulation is displayed on a standard LDR-monitor under of- fice conditions and the prevailing illumination is incorporated. As contrast perception is highly subjective, a psychophysical experi- ment was performed under realistic night driving conditions, in- cluding background illumination as well as a representative driving situation to permit realistic driving behavior.

关键词： Glare

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perception of simplification artifacts for animated characters 11

Perception of simplification artifacts for animated characte...

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

作者： Larkin, Michéal O'Sullivan, Carol Trinity College Dublin Ireland

ISBN: (纸本)9781450308892

For real-time animation of characters, Level of Detail (LOD) techniques are usually deployed to achieve optimal efficiency and realism. Tools that can aid an application designer or developer to deploy simplification methods and LOD representations under different circumstances are therefore needed. In this paper we explore the perception of texture, silhouette and lighting artifacts on simplified character models, including the effect animation intensity has on the perceptibility of these artifacts. We propose novel methods to simulate each artifact separately, and test their effects in isolation and cumulatively. Our results provide useful insights and guidelines, including the importance of silhouette preservation. An adaptation of PerceptualDiff for predicting simplification detection has been developed, which can be used to guide automatic model placement and LOD selection in realtime character applications. © 2011 ACM.

关键词： Animation

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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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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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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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Display formats for the evaluation of automotive dashboards physical dimensions 10

Display formats for the evaluation of automotive dashboards ...

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

作者： Mestre, Daniel R. Blumenthal, David Boivin, Ludivine Pergandi, Jean-Marie Institute of Movement Sciences Mediterranean Virtual Reality Center Marseilles France Perception and Sensory Science Group Renault Guyancourt France

ISBN: (纸本)9781450302487

Virtual Reality prototyping can be used early in a design process, in order to question observers about the aesthetics of future vehicles, without the need for physical mock-ups. However, it is suspected that numerical display formats and solutions are not all equivalent, concerning the physical dimensions an observer is able to appreciate. This question is particularly acute, if one considers the transferability of conclusions reached using virtual prototyping to the real outcome of the design process.

关键词： Automotive engineering

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