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visualization with smooth oriented textures and flows: Insights from perception 06

Visualization with smooth oriented textures and flows: Insig...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Ben-Shahar, Ohad Department of Computer Science Ben-Gurion University Israel

ISBN: (纸本)1595934294

Oriented textures and smooth flows are common texture patterns in visualization, non-photorealistic rendering, and graphical depictions of 3D objects. While these patterns have been partially studied in terms of their contribution to the inference of 3D shape, early visual aspects of their perception, and in particular, their segregation and perceptual organization into coherent parts, have been largely ignored. Here we explore the perception of such smoothly varying oriented textures and flow patterns in order to provide several insights and formal constraints to their constructive use in graphics and visualization. First, we challenge the view that salient perceptual singularities between perceptually coherent regions in orientation-defined textures (ODTs) are tightly dependent upon outstanding contrasts (a.k.a. gradients, or discontinuities) in their local orientation. Unfortunately, this widely accepted view has emerged from two decades of psychophysical research into orientation-based texture segregation (OBTS) which focused mostly on piecewise constant ODTs. A more general inquiry, however, into ODTs of smoothly varying orientation, reveals new perceptual phenomena. In particular, as we show here, completely smooth oriented patterns exhibit striking perceptual singularities that often are mistaken for discontinuities, and are neither predictable from orientation contrasts nor are they detectable by popular segmentation algorithms (Fig. 1). In contrast to existing perceptual models, we then show that our previous (differential) geometric analysis of oriented patterns [BenShahar and Zucker 2003] can be extended into a new theory that fully predicts the observed perceptual singularities using a novel computational "perceptual singularities measure" (PSM): PSM(x,y)= ∏κT2+κN2>τ(Ridges[κN(x,y) 2/κT(x,y)2 + κN(x,y) 2]) (1) where κT(x,y) and κN(x,y) are the tangential and normal curvatures of the pattern, Ridges() returns the set of ridge points of its argument functi

关键词： visualization

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Verification of rendering quality from measured BTFs 06

Verification of rendering quality from measured BTFs

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Meseth, Jan Müller, Gero Klein, Reinhard Röder, Florian Arnold, Michael Institute for Computer Science II Universität Bonn Germany IC:IDO GmbH Stuttgart Germany DaimlerChrysler AG Sindelfingen Germany

ISBN: (纸本)1595934294

One of the most important, still unsolved problems in computer graphics is the generation of predictive imagery, i.e., images that represent perfect renditions of reality. Such perfect images are required in application areas like Virtual Prototyping for making reliable decisions in the costly design development of novel products like cars and airplanes. Recently, measured material properties received significant attention since they enable generation of highly accurate images that appear to be predictive at a first glance. In this work we investigate the degree of realism that can be achieved using measured bidirectional texture functions (BTFs) by comparing photographs and rendered images at two scales. To analyze the realism of rendered images at a coarse scale, we compare the light distribution resulting from standard materials to the one from measured BTFs by automatic procedures. At a fine scale, accurate reproduction of material structures is checked by a psychophysical study. Our results show that measured BTFs lead to much more accurate results than standard materials at both scales. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Computer graphics

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perception of Image Motion during Head Movement 06

Perception of Image Motion during Head Movement

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Li, Li Adelstein, Bernard D. Ellis, Stephen R. Human Systems Integration Division NASA Ames Research Center Moffett Field CA 94035 San Jose State University Foundation San Jose CA 9517 Department of Psychology University of Hong Kong Pokfulam Road Hong Kong Hong Kong

ISBN: (纸本)1595934294

Previous studies have shown that self-motion has an inhibiting effect on concurrent 3D motion perception. To investigate whether self-motion similarly impairs concurrent image motion perception, we examined human perception of head-referenced horizontal image motion during head movement. The displayed stimulus was composed of a checkerboard image in a head mounted display oscillating from side to side at four frequencies (0.25, 0.5, 1 and 2 Hz) with half peak-to-peak amplitudes ranging from 0° to 5.64. Eight observers rated the magnitude of the checkerboard motion while either rotating their head about a vertical axis (yaw), about a horizontal axis (pitch), or holding it still. For all image oscillation frequencies, perceptual sensitivity to image motion amplitude was reduced during both horizontal and vertical head movements (mean reduction: 0.44 and 0.17, respectively). In contrast, perceptual bias was affected only at 2 Hz (mean shift: -9.9% and -12.2% of the full image motion amplitude for horizontal and vertical head movements, respectively). The results indicate that head movement causes gain reductions in motion magnitude estimation at image oscillation frequencies &le1 Hz. At an oscillation frequency of 2 Hz, head movement produces both a gain reduction and a bias shift. Virtual environment developers could take advantage of such effects by relaxing requirements for image stability as well as motion fidelity during head movement. Copyright © 2006 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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Presence, rather than prior exposure, is the more strongly indicated factor in the accurate perception of egocentric distances in real world co-located immersive virtual environments 06

Presence, rather than prior exposure, is the more strongly i...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Ries, Brian Interrante, Victoria Anderson, Lee Lindquist, Jason Department of Computer Science University of Minnesota Department of Architecture University of Minnesota

ISBN: (纸本)1595934294

In recent work [4,2], we have discovered that people are able to make surprisingly accurate judgments about egocentric distances in an immersive virtual environment (IVE) in the special case that the IVE represents a high fidelity model of the same physical space that the user is actually occupying, and the user has been able to unambiguously verify this by viewing the real space prior to donning the display upon which the corresponding virtual environment is presented. Through followup experiments in multiple locales, we have verified that the key factor enabling this distance perception accuracy is fact of co-location, rather than any particular characteristics of the physical environment [1]. One possible interpretation of these intriguing results is that observers are better enabled to make accurate judgments of egocentric distance in an IVE when they are when they are cognitively 'immersed' or 'present' in the IVE - i.e. when they readily accept the virtual environment as being 'equivalent' to the real world and are therefore prepared to act in the virtual world in the same way that they act in the real world [3]. However, another interpretation is also possible: it could be that people are able to make accurate judgments of egocentric distances in a virtual environment when they know that it exactly corresponds to a recently viewed real environment because they are able to form a metrically accurate mental model of the spatial structure of the real environment from their brief exposure to it, so that when they are subsequently presented with the virtual environment they simply calibrate their mental model of distances in the IVE to be consistent with their remembered model of the corresponding real environment. In order to disambiguate between the 'presence' hypothesis and the 'spatial memory' hypothesis, we conducted the following study. Using a between-subjects design, we asked observers to make judgments of egocentric distance via blind walking in a real ro

关键词： Sensory perception

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A comparison of immersive HMD, fish tank VR and fish tank with haptics displays for volume visualization 06

A comparison of immersive HMD, fish tank VR and fish tank wi...

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3rd symposium on applied perception in graphics and visualization, APGV 2006

作者： Qi, Wen Taylor Ii, Russell M. Healey, Christopher G. Martens, Jean-Bernard Eindhoven University of Technology UNC Chapel Hill North Carolina State University

ISBN: (纸本)1595934294

Although a wide range of virtual reality (VR) systems are in use, there are few guidelines to help system and application developers select the components most appropriate for the domain problem they are investigating. Using the results of an empirical study, we developed such guidelines for the choice of display environment for four specific, but common, volume visualization problems: identification and judgment of the size, shape, density, and connectivity of objects present in a volume. These tasks are derived from questions being asked by collaborators studying Cystic Fibrosis (CF). We compared user performance in three different stereo VR systems: (1) head-mounted display (HMD);(2) fish tank VR (fish tank);and (3) fish tank VR augmented with a haptic device (haptic). HMD participants were placed "inside" the volume and walked within it to explore its structure. Fish tank and haptic participants saw the entire volume on-screen and rotated it to view it from different perspectives. Response time and accuracy were used to measure performance. Results showed that the fish tank and haptic groups were significantly more accurate at judging the shape, density, and connectivity of objects and completed the tasks significantly faster than the HMD group. Although the fish tank group was itself significantly faster than the haptic group, there were no statistical differences in accuracy between the two. Participants classified the HMD system as an "inside-out" display (looking outwards from inside the volume), and the fish tank and haptic systems as "outside-in" displays (looking inwards from outside the volume). Including haptics added an inside-out capability to the fish tank system through the use of touch. We recommend an outside-in system because it offers both overview and context, two visual properties that are important for the volume visualization tasks we studied. In addition, based on the haptic group's opinion (80% positive) that haptic feedback aided comprehe

关键词： Virtual reality

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Accelerating network traffic analytics using query-driven visualization

Accelerating network traffic analytics using query-driven vi...

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IEEE symposium on Visual Analytics Science and Technology 2006, VAST 2006

作者： Wes Bethel, E. Campbell, Scott Dart, Eli Stockinger, Kurt Wu, Kesheng Computational Research Division Lawrence Berkeley National Laboratory University of California Berkeley CA 94720 National Energy Research Scientific Computing Center Division Lawrence Berkeley National Laboratory University of California Berkeley CA 94720 Energy Sciences Network Lawrence Berkeley National Laboratory University of California Berkeley CA 94720

ISBN: (纸本)1424405912

Realizing operational analytics solutions where large and complex data must be analyzed in a time-critical fashion entails integrating many different types of technology. This paper focuses on an interdisciplinary combination of scientific data management and visualization/analysis technologies targeted at reducing the time required for data filtering, querying, hypothesis testing and knowledge discovery in the domain of network connection data analysis. We show that use of compressed bitmap indexing can quickly answer queries in an interactive visual data analysis application, and compare its performance with two alternatives for serial and parallel filtering/querying on 2.5 billion records' worth of network connection data collected over a period of 42 weeks. Our approach to visual network connection data exploration centers on two primary factors: interactive ad-hoc and multiresolution query formulation and execution over n dimensions and visual display of the n-dimensional histogram results. This combination is applied in a case study to detect a distributed network scan and to then identify the set of remote hosts participating in the attack. Our approach is sufficiently general to be applied to a diverse set of data understanding problems as well as used in conjunction with a diverse set of analysis and visualization tools. © 2006 IEEE.

关键词： Telecommunication traffic

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proceedings - APGV 2005: 2nd symposium on applied perception in graphics and visualization

Proceedings - APGV 2005: 2nd Symposium on Applied Perception...

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APGV 2005: 2nd symposium on applied perception in graphics and visualization

ISBN: (纸本)1595931392

The proceedings contain 30 papers. The topics discussed include: visibility of temporal blur on a gaze-contingent display;layered motion field visualization: perceptual issues;perceptually optimizing textures for layered surfaces;measuring vection in a large screen virtual environment;exploring perceptual equivalence between real and simulated imagery;auxiliary object knowledge influences visually-guided interception behavior;seamless perceptual morphing using continuous hybrids, recognizing novel deforming objects;de-emphasis of distracting image regions using texture power maps;virtual and real visual depth;a closer look at texture metrics;and usability issues in transfer function specification for volume rendering.

关键词： Computer graphics

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An experimental design for determining the effects of illumination models in particle visualization 05

An experimental design for determining the effects of illumi...

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APGV 2005: 2nd symposium on applied perception in graphics and visualization

作者： Gribble, Christiaan P. Parker, Steven G. Scientific Computing and Imaging Institute School of Computing University of Utah United States

No abstract available

ISBN: (纸本)1595931392

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Sketch-based perception model for evaluating color segmentations 05

Sketch-based perception model for evaluating color segmentat...

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APGV 2005: 2nd symposium on applied perception in graphics and visualization

作者： Gavilan, David Takahashi, Hiroki Saito, Suguru Nakajima, Masayuki Graduate School of Information Science and Engineering Tokyo Institute of Technology 2-12-1 W8-64 Ookayama Meguro-ku 152-8552 Japan

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ISBN: (纸本)1595931392

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The roles of perception for volume visualization and designing volume visualization methods based on perceptual factors 05

The roles of perception for volume visualization and designi...

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APGV 2005: 2nd symposium on applied perception in graphics and visualization

作者： Zhou, Jianlong Institute for Simulation and Graphics University of Magdeburg Germany

ISBN: (纸本)1595931392

In the context of medical volume visualization, it is useful to study how effectively the visualization depicts anatomical structures and how well features of anatomical structures can be discerned in order to make decisions. So it is important to know what factors affect the understanding of rendered images and further to design more effective rendering algorithms under considering these factors. However, they are not fully evaluated. These are important for users to get better understanding of a 3D data set, and to help to develop effective visualization methods. Because visualization renditions are perceived through human visual perception, visual perception has important effects on mental models. This paper aims to analyze the roles of perception for volume visualization and use the perceptual analysis results to design volume visualization methods.

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