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检索条件"任意字段=Proceedings of the ACM SIGGRAPH Symposium on Applied Perception in Graphics and Visualization"

共 174 条记录，以下是21-30 订阅

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Investigating spatial understanding in multi-component displays 13

Investigating spatial understanding in multi-component displ...

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2013 acm symposium on applied perception, SAP 2013

作者： McNamara, Ann M. Parke, Frederic I. Sanford, Mat Broussard, Garrett Kebedoux, Kourtney Department of Visualization Texas A and M University United States

ISBN: (纸本)9781450322621

This poster describes an experiment designed to evaluate the effectiveness of a seven screen tiled display. Results show that there are no statistically significant differences in performance on a simple spatial task across display technology. This work can assist researchers of panoramic display systems in evaluating the optimal spatial placement of screen hardware and limits for bezel separation. © 2013 Authors.

关键词： Human computer interaction

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Evaluating the effect of emotion on gender recognition in virtual humans 13

Evaluating the effect of emotion on gender recognition in vi...

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2013 acm symposium on applied perception, SAP 2013

作者： Zibrek, Katja Hoyet, Ludovic Ruhland, Kerstin McDonnell, Rachel Graphics Vision and Visualisation Group Trinity College Dublin Ireland

ISBN: (纸本)9781450322621

In this paper, we investigate the ability of humans to determine the gender of conversing characters, based on facial and body cues for emotion. We used a corpus of simultaneously captured facial and body motions from four male and four female actors. In our Gender Rating task, participants were asked to rate how male or female they considered the motions to be, under different emotional states. In our Emotion Recognition task, participants were asked to classify the emotions, in order to determine how accurately perceived those emotions were. We found that gender perception was affected by emotion, where certain emotions facilitated gender determination while others masked it. We also found that there was no correlation between how accurate an emotion was portrayed and how much gender information was present in that motion. Finally, we found that the model used to display the motion did not affect gender perception of motion but did alter emotion recognition. © 2013 acm.

关键词： Emotion Recognition

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Spatial user interface for experiencing mogao caves 13

Spatial user interface for experiencing mogao caves

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1st acm symposium on Spatial User Interaction, SUI 2013

作者： Chan, Leith Kin Yip Shaw, Jeffrey Kenderdine, Sarah Department of Industrial and Manufacturing Systems Engineering University of Hong Kong Hong Kong School of Creative Media City University of Hong Kong Hong Kong Applied Laboratory of Interactive Visualization and Embodiment City University of Hong Kong Hong Kong

ISBN: (纸本)9781450321419

In this paper, we describe the design and implementation of the Pure Land AR which is an installation that employs spatial user interface and allows users to virtually visit the UNESCO world heritage - Mogao Caves by using handheld devices. The installation was shown to the public at different museums and galleries. The result of the work and the user responses is discussed. Copyright © acm 2013.

关键词： Virtual reality

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How does lighting direction affect shape perception of glossy and matte surfaces? 13

How does lighting direction affect shape perception of gloss...

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2013 acm symposium on applied perception, SAP 2013

作者： Faisman, Arthur Langer, Michael S. School of Computer Science McGill University Montreal QC Canada

ISBN: (纸本)9781450322621

To visualize the shape of 2D surface data, one often renders it using a simple model with matte or glossy reflectance and a light source at infinity. The parameter choices for this model are typically ad hoc, however, and previous studies have provided varying evidence on what this choice should be so that the shape is perceived as accurately as possible. Here we present an experiment that examines local qualitative shape perception on matte and glossy surfaces where we vary both the overall slant of the surface with respect to the viewer and the slant of the distant light source. We find that increasing the slant of the light source to twice that of the surface slant angle improves subjects' perception of qualitative shape of glossy surfaces. Additionally, at these high slant angles the glossy surface percepts are better than those of matte surfaces. We argue that these improvements are due to the positioning of the highlights at the peaks and valleys of the terrain, where they demarcate the surface maxima. We also find that increasing the light slant produces better and/or more consistent shape percepts than the default lighting in commercial visualization software such as Matlab and Mathematica. © 2013 acm.

关键词： Light sources

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Stereoscopic static depth perception of enclosed 3D objects 13

Stereoscopic static depth perception of enclosed 3D objects

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2013 acm symposium on applied perception, SAP 2013

作者： Marreiros, Filipe M. M. Smedby, Örjan Linköping University Sweden Linköping University Sweden Linköping University Sweden

ISBN: (纸本)9781450322621

Depth perception of semi-transparent virtual objects and the visualization of their spatial layout are crucial in many applications, in particular medical applications. Depth cues for opaque objects have been extensively studied, but this is not the case for stereoscopic semi-transparent objects, in particular in the case when one 3D object is enclosed within a larger exterior object. In this work we explored different stereoscopic rendering methods to analyze their impact on depth perception accuracy of an enclosed 3D object. Two experiments were performed: the first tested the hypotheses that depth perception is dependent on the color blending of objects (opacity - alpha) for each rendering method and that one of two rendering methods used is superior. The second experiment was performed to corroborate the results of the first experiment and to test an extra hypothesis: is depth perception improved if an auxiliary object that provides a relationship between the enclosed object and the exterior is used? The first rendering method used is simple alpha blending with Blinn-Phong shading model, where a segmented brain (exterior object) and a synthetic tumor (enclosed object) were blended. The second rendering method also uses Blinn-Phong, but the shading was modified to preserve silhouettes and to provide an illustrative rendering. Comparing both rendering methods, the brighter regions of the first rendering method will become more transparent in the second rendering method, thus preserving silhouette areas. The results show that depth perception accuracy of an enclosed object rendered with a stereoscopic system is dependent on opacity for some rendering methods (simple alpha blending), but this effect is less pronounced than the dependence on object position in relation to the exterior object. The illustrative rendering method is less dependent on opacity. The different rendering methods also perform slightly differently;an illustrative rendering method was superior a

关键词： Stereo image processing

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proceedings - I3D 2012: acm siggraph symposium on Interactive 3D graphics and Games

Proceedings - I3D 2012: ACM SIGGRAPH Symposium on Interactiv...

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2012 16th acm siggraph symposium on Interactive 3D graphics and Games, I3D 2012

ISBN: (纸本)9781450311946

The proceedings contain 39 papers. The topics discussed include: tabletop ensemble: touch-enabled virtual percussion instruments;way portals: efficient multi-agent navigation with line-segment goals;dynamic eye convergence for head-mounted displays improves user performance in virtual environments;constant-time all-pairs geodesic distance query on triangle meshes;computing 2D constrained delaunay triangulation using the GPU;lossless compression of variable-precision floating-point buffers on GPUs;interactive simulation of dynamic crowd behaviors using general adaptation syndrome theory;a lightweight, procedural, vector watercolor painting engine;ray tracing visualization toolkit;sleight of hand: perception of finger motion from reduced marker sets;using natural vibrations to guide control for locomotion;and an example-based motion synthesis technique for locomotion and object manipulation.

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proceedings, SAP 2012 - acm symposium on applied perception

Proceedings, SAP 2012 - ACM Symposium on Applied Perception

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2012 acm symposium on applied perception, SAP 2012

ISBN: (纸本)9781450314312

The proceedings contain 29 papers. The topics discussed include: stepping over and ducking under: the influence of an avatar on locomotion in an HMD-based immersive virtual environment;improvements in visually directed walking in virtual environments cannot be explained by changes in gait alone;which facial profile do humans expect after seeing a front view ? - a comparison with a linear face model;online simulation of emotional interactive behaviors with hierarchical Gaussian process dynamical models;how responsiveness affects players' perception in digital games;wavelet based single trial classification of typical image based rendering artifacts;dynamic range compression by differential zone mapping based on psychophysical experiments;playing with puffball: simple scale-invariant inflation for use in vision and graphics;and minification affects verbal and action-based distance judgments differently in head-mounted displays.

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Computational Aesthetics 2012 - International symposium on Computational Aesthetics in graphics, visualization, and Imaging

Computational Aesthetics 2012 - International Symposium on C...

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8th Annual symposium on Computational Aesthetics in graphics, visualization, and Imaging, CAe 2012

ISBN: (纸本)9783905674439

The proceedings contain 14 papers. The topics discussed include: SAMBA: steadied choreographies;integrarte: DigitalArt using body interaction;sketches by Paul the robot;feedback-guided stroke placement for a painting machine;the aMotion toolkit: painting with affective motion textures;a technique for art direction of physically based fire simulation;evaluating visual aesthetics in photographic portraiture;determining an aesthetic inscribed curve;developing a system of screen-less animation for experiments in perception of movement;random discrete colour sampling;exploring the effect of color palette in painterly rendered character sequences;duotone surfaces;surface covering curves;and accurate and discernible photocollages.

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Evaluating observers' sensitivity to errors in human and physical throws 12

Evaluating observers' sensitivity to errors in human and phy...

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2012 acm symposium on applied perception, SAP 2012

作者： Vicovaro, Michele Hoyet, Ludovic Burigana, Luigi O'Sullivan, Carol Department of General Psychology University of Padua Italy Graphics Vision and Visualisation Group Trinity College Dublin Ireland

ISBN: (纸本)9781450314312

Understanding whether observers are sensitive to physical distortions in dynamic events is important in order to develop plausible simulations while saving time on details that observers cannot perceive [Barzel et al. 1996]. In this experiment, we evaluated observers' sensitivity to physical distortions in virtual throwing animations. As previous results showed a greater sensitivity to physical distortions on virtual human characters rather than on simple objects [Reitsma et al. 2008], we studied the effect of using both a biological human throw and a simple physical simulation (free fall of a ball on a ramp). The results show that observers' sensitivity to errors depends on the animacy of the thrower.

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Playing with Puffball: Simple scale-invariant inflation for use in vision and graphics 12

Playing with Puffball: Simple scale-invariant inflation for ...

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2012 acm symposium on applied perception, SAP 2012

作者： Twarog, Nathaniel R. Tappen, Marshall F. Adelson, Edward H. MIT United States University of Central Florida United States

ISBN: (纸本)9781450314312

We describe how inflation, the act of mapping a 2D silhouette to a 3D region, can be applied in two disparate problems to offer insight and improvement: silhouette part segmentation and image-based material transfer. To demonstrate this, we introduce Puffball, a novel inflation technique, which achieves similar results to existing inflation approaches - including smoothness, robustness, and scale and shift-invariance - through an exceedingly simple and accessible formulation. The part segmentation algorithm avoids many of the pitfalls of previous approaches by finding part boundaries on a canonical 3-D shape rather than in the contour of the 2-D shape;the algorithm gives reliable and intuitive boundaries, even in cases where traditional approaches based on the 2D Minima Rule are misled. To demonstrate its effectiveness, we present data in which subjects prefer Puffball's segmentations to more traditional Minima Rule-based segmentations across several categories of silhouettes. The texture transfer algorithm utilizes Puffball's estimated shape information to produce visually pleasing and realistically synthesized surface textures with no explicit knowledge of either underlying shape. © 2012 acm.

关键词： Object recognition

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