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检索条件"任意字段=Proceedings of the 1st Symposium on Applied perception in graphics and visualization"

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MDMap: A system for data-driven layout and exploration of molecular dynamics simulations

MDMap: A system for data-driven layout and exploration of mo...

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1st IEEE symposium on Biological Data visualization, BioVis 2011

作者： Patro, Robert Ip, Cheuk Yiu Bista, Sujal Thirumalai, D. Cho, Samuel S. Varshney, Amitabh Department of Computer Science Institute for Advanced Computer Studies University of Maryland College Park United States Biophysics Program Institute for Physical Sciences and Technology University of Maryland College Park United States Departments of Physics and Computer Science Wake Forest University United States

ISBN: (纸本)9781467300025

Contemporary molecular dynamics simulations result in a glut of simulation data, making analysis and discovery a difficult and burdensome task. We present MDMap, a system designed to summarize long-running molecular dynamics (MD) simulations. We represent a molecular dynamics simulation as a state transition graph over a set of intermediate (stable and semi-stable) states. The transitions amongst the states together with their frequencies represent the flow of a biomolecule through the trajectory space. MDMap automatically determines potential intermediate conformations and the transitions amongst them by analyzing the conformational space explored by the MD simulation. MDMap is an automated system to visualize MD simulations as state-transition diagrams, and can replace the current tedious manual layouts of biomolecular folding landscapes with an automated tool. The layout of the representative states and the corresponding transitions among them is presented to the user as a visual synopsis of the long-running MD simulation. We compare and contrast multiple presentations of the state transition diagrams, such as conformational embedding, and spectral, hierarchical, and force-directed graph layouts. We believe this system could provide a road-map for the visualization of other stochastic time-varying simulations in a variety of different domains. © 2011 IEEE.

关键词： visualization

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The effect of stereo and context on memory and awareness states in immersive virtual environments 10

The effect of stereo and context on memory and awareness sta...

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

作者： Bennett, Adam Coxon, Matthew Mania, Katerina Dept. of Informatics University of Sussex United Kingdom Dept. of Psychology York St John University United Kingdom Dept. of Electronic and Computer Eng. Technical University of Crete Greece

ISBN: (纸本)9781450302487

Spatial awareness is crucial for human performance efficiency of any task that entails perception of space. Memory of spaces is an imperfect reflection of the cognitive activity (awareness states) that underlies performance in such environments. Furthermore, performance on these tasks may also be influenced by the context of the environment. This research investigates the effect of stereo viewing on object recognition after exposure to an immersive VE, in terms of both scene context and associated awareness states. The immersive simulation consisted of a radiosity-rendered room that was either populated by objects consistent with an office setting or by primitive objects located in similar positions. The simulation was displayed on a stereo head-tracked Head Mounted Display. Twenty-four participants across two visual conditions of varying depth cues (absence vs presence of stereo cues) were exposed to the VE and completed an object-based memory recognition task. Participants also reported one of four states of awareness following each recognition response which reflected whether visual mental imagery was induced during retrieval. Results revealed better memory of objects that were consistent with the environment context and associated with vivid memorial experiences when the space was viewed in stereo. © 2010 ACM.

关键词： Object recognition

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perception of linear and nonlinear motion properties using a FACS validated 3D facial model 10

Perception of linear and nonlinear motion properties using a...

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

作者： Cosker, Darrene Krumhuber, Eva Hilton, Adrian Department of Computer Science University of Bath United Kingdom Swiss Center for Affective Sciences University of Geneva Switzerland Centre for Vision Speech and Signal Processing University of Surrey United Kingdom

ISBN: (纸本)9781450302487

In this paper we present the first Facial Action Coding System (FACS) valid model to be based on dynamic 3D scans of human faces for use in graphics and psychological research. The model consists of FACS Action Unit (AU) based parameters and has been independently validated by FACS experts. Using this model, we explore the perceptual differences between linear facial motions - represented by a linear blend shape approach - and real facial motions that have been synthesized through the 3D facial model. Through numerical measures and visualizations, we show that this latter type of motion is geometrically nonlinear in terms of its vertices. In experiments, we explore the perceptual benefits of nonlinear motion for different AUs. Our results are insightful for designers of animation systems both in the entertainment industry and in scientific research. They reveal a significant overall benefit to using captured nonlinear geometric vertex motion over linear blend shape motion. However, our findings suggest that not all motions need to be animated nonlinearly. The advantage may depend on the type of facial action being produced and the phase of the movement. © 2010 ACM.

关键词： Animation

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step synchronization and third person speed perception in virtual environment locomotion simulators 09

Step synchronization and third person speed perception in vi...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Lehtinen, Sonja Cheung, Clara Pelah, Adar Cameron, Jonathan Lasenby, Joan University of Cambridge United Kingdom University of York United Kingdom

ISBN: (纸本)9781605587431

Human locomotion is known to be influenced by observation of another person's gait. For example, athletes often synchronize their step in long distance races. However, how interaction with a virtual runner affects the gait of a real runner has not been studied. We investigated this by creating an illusion of running behind a virtual model (VM) using a treadmill and large screen virtual environment showing a video of a VM. We looked at step synchronization between the real and virtual runner and at the role of the step frequency (SF) in the real runner's perception of VM speed. We found that subjects match VM SF when asked to match VM speed with their own (Figure 1). This indicates step synchronization may be a strategy of speed matching or speed perception. Subjects chose higher speeds when VMSF was higher (though VM was 12km/h in all videos). This effect was more pronounced when the speed estimate was rated verbally while standing still. (Figure 2). This may due to correlated physical activity affecting the perception of VM speed [Jacobs et al. 2005];or step synchronization altering the subjects' perception of self speed [Durgin et al. 2007]. Our findings indicate that third person activity in a collaborative virtual locomotive environment can have a pronounced effect on an observer's gait activity and their perceptual judgments of the activity of others: the SF of others (virtual or real) can potentially influence one's perception of self speed and lead to changes in speed and SF. A better understanding of the underlying mechanisms would support the design of more compelling virtual trainers and may be instructive for competitive athletics in the real world. © 2009 ACM.

关键词： Virtual reality

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004: Preface

Proceedings - 1st Symposium on Applied Perception in Graphic...

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Bulthoff, Heinrich Rushmeier, Holly Max Planck Inst. for Biol. Cybernet. Germany Yale University United States

No abstract available

ISBN: (纸本)1581139144

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

Proceedings - 1st Symposium on Applied Perception in Graphic...

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

ISBN: (纸本)1581139144

The proceedings contain 45 papers from the 1st symposium on applied perception in graphics and visualization, APGV 2004. The topics discussed include: recalibration of rotational locomotion in immersive virtual environments;distance perception in real and virtual environments;vision realistic rendering: simulation of the scanned foveal image from wavefront data on human subjects;enhancing perceived depth in images via artistic matting;selective rendering of task related scenes;effective color coding of menu design for movie genres;observations of visual and audio coaching methods in a virtual laparoscopic training environment;selective rendering of task related sceness and causes of depth perception errors.

关键词： Virtual reality

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Improving Search Task Performance Using Subtle Gaze Direction 08

Improving Search Task Performance Using Subtle Gaze Directio...

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symposium on applied perception in graphics and visualization

作者： McNamara, Ann Bailey, Reynold Grimm, Cindy St Louis Univ St Louis MO 63103 USA Rochester Inst Technol Rochester NY 14623 USA Washington Univ St Louis MO 63130 USA

ISBN: (纸本)9781595939814

A new experiment is presented which demonstrates the usefulness of an image space modulation technique called Subtle Gaze Direction (SGD) for guiding the user in a simple searching task. SGD uses image space modulations in the luminance channel to guide a viewer's gaze about a scene without interrupting their visual experience. The goal of SGD is to direct a viewer's gaze to certain regions of a scene without introducing noticeable changes in the image. Using a simple searching task we compared performance using no modulation, using subtle modulation and using obvious modulation. Results from the experiments show improved performance when using subtle gaze direction, without affecting the user's perception of the image. Results establish the potential of the method for a wide range of applications including gaming, perceptually based rendering, navigation in virtual environments and medical search tasks.

关键词： eye-tracking psychophysics gaze direction luminance

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Neural Modeling of Flow Rendering Effectiveness 08

Neural Modeling of Flow Rendering Effectiveness

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symposium on applied perception in graphics and visualization

作者： Pineo, Daniel Wares, Colin Univ New Hampshire Durham NH 03824 USA

ISBN: (纸本)9781595939814

It has been previously proposed that understanding the mechanisms of contour perception can provide a theory for why some flow rendering methods allow for better judgments of advection pathways than others. In the present paper we develop this theory through a numerical model of the primary visual cortex of the brain (Visual Area 1) where contour enhancement is understood to occur according to most neurological theories. We apply a two-stage model of contour perception to various visual representations of flow fields evaluated by Laidlaw et al [2001]. In the first stage, contour enhancement is modeled based on Li's [1998] cortical model. In the second stage, a model of contour integration is proposed designed to support the task of advection path tracing. The model yields insights into the relative strengths of different flow visualization methods for the task of visualizing advection pathways.

关键词： Flow visualization contour perception visual cortex visualization perceptual theory

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Evaluating the emotional content of human motions on real and virtual characters 08

Evaluating the emotional content of human motions on real an...

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symposium on applied perception in graphics and visualization

作者： McDonnell, Rachel Joerg, Sophie McHugh, Joanna Newell, Fiona O'Sullivan, Carol Trinity Coll Dublin Graph Vis & Visualisat Grp Dublin Ireland Neurosci Inst Dublin Ireland

ISBN: (纸本)9781595939814

In order to analyze the emotional content of motions portrayed by different characters, we created real and virtual replicas of an actor exhibiting six basic emotions: sadness, happiness, surprise, fear, anger and disgust. In addition to the video of the real actor, his actions were applied to five virtual body shapes: a low and high resolution virtual counterpart, a cartoon-like character, a wooden mannequin, and a zombie-like character (Figure 1). Participants were asked to rate the actions based on a list of 41 more complex emotions. We found that the perception of emotional actions is highly robust and to the most part independent of the character's body.

关键词： perception motion-capture

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Perceived Directionality of 1/f^β Noise Surfaces 08

Perceived Directionality of 1/<i>f</i><SUP>β</SUP> Noise Su...

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symposium on applied perception in graphics and visualization

作者： Shah, Pratik Padilla, stefano Green, Patrick Chantler, Mike Heriot Watt Univ Edinburgh EH14 4AS Midlothian Scotland

ISBN: (纸本)9781595939814

We are investigating the perceived characteristics of 3D surface texture by using rendered images of synthetic surfaces with precisely defined characteristics. We compute texture features directly from the height data and present observers with animated images that mimic the way in which people rotate surface textures when assessing their characteristics. This both eliminates illumination induced bias and provides observers with rich, realistic stimuli.

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