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The perception of finger motions 10

The perception of finger motions

引用

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

作者： Jörg, Sophie Hodginsy, Jessica O'Sullivanz, Carol Trinity College Dublin Ireland Carnegie Mellon University Disney Research Pittsburgh United States

ISBN: (纸本)9781450302487

In this paper, we explore the perception of finger motions of virtual characters. In three experiments, designed to investigate finger animations, we asked the following questions: When are errors in finger motion noticeable? What are the consequences of these errors? What animation method should we recommend? We found that synchronization errors of as little as 0.1s can be detected, but that the perceptibility of errors is highly dependent on the type of motion. Errors in finger animations can change the interpretation of a scene even without altering its perceived quality. Finally, out of the four conditions tested - original motion capture, no motions, keyframed animation and randomly selected motions - the original motion captured movements were rated as having the highest quality. © 2010 acm.

关键词： Errors

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Movements and voices affect perceived sex of virtual conversers 10

Movements and voices affect perceived sex of virtual convers...

引用

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

作者： McDonnell, Rachel O'Sullivan, Carol Graphics Vision and Visualisation Group Trinity College Dublin Ireland

ISBN: (纸本)9781450302487

In this paper, we investigate the ability of humans to determine the sex of conversing characters, based on audio and visual cues. We used a corpus of motions and sounds captured from three male and three female actors conversing about a range of topics. In our Unisensory Experiments, visual and auditory stimuli were presented separately to participants who rated how male or female they found them to be. In our Multisensory Experiments, audio and visual information were integrated to determine how they interacted. We found that audio was much easier to classify than motion, and that audio affected but did not saturate ratings when motion and audio were integrated. Finally, even when informative appearance cues were present, this did not help to disambiguate incongruent motion and audio. © 2010 acm.

关键词： virtual humans perception motion capture

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What your design looks like to peripheral vision 10

What your design looks like to peripheral vision

引用

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

作者： Raj, Alvin Rosenholtz, Ruth M.I.T. Cambridge MA United States

ISBN: (纸本)9781450302487

At any given instant, much of a display appears in a user's peripheral vision. Based on the information available in a glance, the user moves their eyes, scanning the display for items of interest, and piecing together a coherent view of the display. Much of this processing happens unconsciously. Understanding the information available in the periphery can help design better information visualizations and user interfaces, by enabling designers to make displays that effectively guide eye movements and make important information available in a glance. However, it is difficult to attend to our peripheral vision to gain insights about the information available there. In this paper, we discuss a means of visualizing the information available in peripheral vision, given an image of a display and the current fixation. We show results of our model on several information visualizations. © 2010 acm.

关键词： visualization

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A framework for enhancing depth perception in computer graphics 10

A framework for enhancing depth perception in computer graph...

引用

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

作者： Cipiloglu, Zeynep Bulbul, Abdullah Capin, Tolga Bilkent University Turkey

ISBN: (纸本)9781450302487

This paper introduces a solution for enhancing depth perception in a given 3D computer-generated scene. For this purpose, we propose a framework that decides on the suitable depth cues for a given scene and the rendering methods which provide these cues. First, the system calculates the importance of each depth cue using a fuzzy logic based algorithm which considers the target tasks in the application and the spatial layout of the scene. Then, a knapsack model is constructed to keep the balance between the rendering costs of the graphical methods that provide these cues and their contibution to depth perception. This cost-profit analysis step selects the proper rendering methods. In this work, we also present several objective and subjective experiments which show that our automated depth enhancement system is statistically (p

关键词： Fuzzy logic

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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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Temporal thresholds for feature detection in flow visualization 10

Temporal thresholds for feature detection in flow visualizat...

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

作者： Haroz, Steve Whitney, David Computer Science Department University of California Davis United States Psychology Department University of California Berkeley United States

ISBN: (纸本)9781450302487

Optic flow is the coherent motion of a region in the visual field, and the visual system is astoundingly effective at perceiving this large-scale and complex percept. Whenever you rotate your head or move through a scene, nearly every part of your visual field moves at a different speed and velocity. For example, as you walk through a forest, the trees in the horizon appear to slowly expand, and the trees on your sides appear to rapidly move to the extremities of your vision visual field and disappear. In spite of such a myriad of local motions, all of this information is concisely summarized as moving forward. Such summary encoding of a large variety of elements makes this percept a potentially useful tool to exploit for visualization. For that reason, our goal in this study is to test the visual system's ability to use optic flow for a basic visualization task, feature detection.

关键词： Vision

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Does culture affect the perception of emotion in virtual faces? 10

Does culture affect the perception of emotion in virtual fac...

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

作者： Khooshabeh, Peter Gratch, Jonathan Haung, Lixing Tao, Jianhua Institute for Creative Technologies University of Southern California United States National Laboratory of Pattern Recognition Chinese Academy of Sciences China

ISBN: (纸本)9781450302487

Previous research, which has used images of real human faces and mostly from the same facial expression database [Matsumoto and Ekman 1988], has shown that individuals perceive emotions universally across cultures. We conducted an experiment to determine whether culture affects the perception of emotions rendered on virtual faces. Specifically, we test the holistic perception hypothesis that individuals from collectivist cultures, such as East Asians, visually sample information from central regions of the face (near the top of the nose by the eyes), as opposed to sampling from specific features of the face. If the holistic perception hypothesis is true, then individuals will confuse emotional facial expressions that are different in terms of the shape of the mouth facial feature. Our stimuli were computer generated using a face graphical rendering tool, which affords a high level of experimental control for perception researchers.

关键词： Behavioral research

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Estimation of virtual interpupillary distances for immersive head-mounted displays 10

Estimation of virtual interpupillary distances for immersive...

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

作者： Bruder, Gerd Steinickey, Frank Hinrichsz, Klaus Visualization and Computer Graphics Research Group University of Münster Germany

ISBN: (纸本)9781450302487

Head-mounted displays (HMDs) allow users to observe virtual environments (VEs) from an egocentric perspective. In order to present a realistic stereoscopic view, the rendering system has to be adjusted to the characteristics of the HMD, e. g., the display's field of view (FOV), as well as to characteristics that are unique for each user, in particular her interpupillary distance (IPD). Typically, the user's IPD is measured, and then applied to the virtual IPD used for rendering, assuming that the HMD's display units are correctly adjusted in front of the user's eyes. A discrepancy between the user's IPD and the virtual IPD may distort the perception of the VE. In this poster we analyze the user's perception of a VE in a HMD environment, which is displayed stereoscopically with different IPDs. We conducted an experiment to identify virtual IPDs that are identified as natural by subjects for different FOVs. In our experiment, subjects had to adjust the IPD for a rendered virtual replica of our real laboratory until perception of the virtual replica matched perception of the real laboratory. We found that the virtual IPDs subjects estimate as most natural are often not identical to their IPDs, and that the estimations were affected by the FOV of the HMD and the virtual FOV used for rendering.

关键词： Virtual reality

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Evaluating the effectiveness of visualization techniques for schematic diagrams in maintenance tasks 10

Evaluating the effectiveness of visualization techniques for...

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

作者： Kim, Sungye Woo, Insoo Maciejewski, Ross Ebert, David S. Ropp, Timothy D. Thomas, Krystal Rendering and Perceptualization Laboratory Purdue University United States Aviation Technology Purdue University United States Air Force Research Laboratory United States

ISBN: (纸本)9781450302487

In order to perform daily maintenance and repair tasks in complex electrical and mechanical systems, technicians commonly utilize a large number of diagrams and documents detailing system properties in both electronic and print formats. In electronic document views, users typically are only provided with traditional pan and zoom features;however, recent advances in information visualization and illustrative rendering styles should allow users to analyze documents in a more timely and accurate fashion. In this paper, we evaluate the effectiveness of rendering techniques focusing on methods of document/diagram highlighting, distortion, and navigation while preserving contextual information between related diagrams. We utilize our previously developed interactive visualization system (SDViz) for technical diagrams for a series of quantitative studies and an in-field evaluation of the system in terms of usability and usefulness. In the quantitative studies, subjects perform small tasks that are similar to actual maintenance work while using tools provided by our system. First, the effects of highlighting within a diagram and between multiple diagrams are evaluated. Second, we analyze the value of preserving highlighting as well as spatial information when switching between related diagrams, and then we present the effectiveness of distortion within a diagram. Finally, we discuss a field study of the system and report the results of our findings. © 2010 acm.

关键词： visualization

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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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