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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 2010: symposium on applied perception in graphics and visualization

Proceedings - APGV 2010: Symposium on Applied Perception in ...

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

ISBN: (纸本)9781450302487

The proceedings contain 33 papers. The topics discussed include: statistical regularities in low and high dynamic range images;a reassessment of the simultaneous dynamic range of the human visual system;measuring the perception of light inconsistencies;evaluating effectiveness of illustrative visualization of schematic diagrams for maintenance tasks;analysis of disparity distortions in omnistereoscopic displays;how does presentation method and measurement protocol affect distance estimation in real and virtual environments?;egocentric distance judgments in a large screen display immersive virtual environment;can i pass?: using affordances to measure perceived size in virtual environments;a system for exploring large virtual environments that combines scaled translational gain and interventions;saliency for animated meshes with material properties;and perception of linear and nonlinear motion properties using a FACS validated 3D facial model.

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ReVision: Automated classification, analysis and redesign of chart images 11

ReVision: Automated classification, analysis and redesign of...

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24th Annual acm symposium on User Interface Software and Technology, UIST'11

作者： Savva, Manolis Kong, Nicholas Chhajta, Arti Li, Fei-Fei Agrawala, Maneesh Heer, Jeffrey Stanford University United States University of California Berkeley United States

ISBN: (纸本)9781450307161

Poorly designed charts are prevalent in reports, magazines, books and on the Web. Most of these charts are only available as bitmap images;without access to the underlying data it is prohibitively difficult for viewers to create more effective visual representations. In response we present ReVision, a system that automatically redesigns visualizations to improve graphical perception. Given a bitmap image of a chart as input, ReVision applies computer vision and machine learning techniques to identify the chart type (e.g., pie chart, bar chart, scatterplot, etc.). It then extracts the graphical marks and infers the underlying data. Using a corpus of images drawn from the web, ReVision achieves an image classification accuracy of 96% across ten chart categories. It also accurately extracts marks from 79% of bar charts and 62% of pie charts, and from these charts it successfully extracts the data from 71% of bar charts and 64% of pie charts. ReVision then applies perceptually-based design principles to populate an interactive gallery of redesigned charts. With this interface, users can view alternative chart designs and retarget content to different visual styles. © 2011 acm.

关键词： visualization

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Egocentric distance perception in real and HMD-based virtual environments: the effect of limited scanning method 11

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

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proceedings of the acm siggraph symposium on applied perception in graphics and visualization

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

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 self-representation (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 self-avatar (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.

关键词： virtual reality (VR) virtual environments distance estimation head-mounted displays egocentric depth perception

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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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Perceptually-motivated graphics, visualization and 3D displays 10

Perceptually-motivated graphics, visualization and 3D displa...

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acm siggraph 2010 Courses, siggraph '10

作者： McNamara, Ann Mania, Katerina Banks, Marty Healey, Christopher Department of Visualization Texas A and M University 3137 TAMU College Station TX 77843-3137 United States Department of Electronic and Computer Engineering Technical University of Crete University Campus Kounoupidiana Chania Crete Greece Visual Space Perception Laboratory University of California Berkeley United States Department of Computer Science North Carolina State University 890 Oval Drive #8206 United States Marty Banks' Lab. University of California Berkeley Vision Science Berkeley CA 94720-2020 United States

ISBN: (纸本)9781450303958

This course presents timely, relevant examples on how researchers have leveraged perceptual information for optimization of rendering algorithms, to better guide design and presentation in (3D stereoscopic) display media, and for improved visualization of complex or large data sets. Each presentation will provide references and short overviews of cutting-edge current research pertaining to that area. We will ensure that the most up-to-date research examples are presented by sourcing information from recent perception and graphics conferences and journals such as acm Transactions on perception, paying particular attention work presented at the 2010 symposium on applied perception in graphics and visualization.

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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Measuring the perception of light inconsistencies 10

Measuring the perception of light inconsistencies

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

作者： Lopez-Moreno, Jorge Sundstedt, Veronica Sangorrin, Francisco Gutierrez, Diego Universidad de Zaragoza Spain Trinity College Dublin Ireland

ISBN: (纸本)9781450302487

In this paper we explore the ability of the human visual system to detect inconsistencies in the illumination of objects in images. We specifically focus on objects being lit from different angles as the rest of the image. We present the results of three different tests, two with synthetic objects and a third one with digitally manipulated real images. Our results seem to agree with previous publications exploring the topic, but we extend them by providing quantifiable data which in turn suggest approximate perceptual thresholds. Given that light detection in single images is an ill-posed problem, these thresholds can provide valid error limits to related algorithms in different contexts, such as compositing or augmented reality. © 2010 acm.

关键词： Augmented reality

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