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检索条件"任意字段=Symposium on Applied Perception in Graphics and Visualization"

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Proceedings - APGV 2006: symposium on applied perception in graphics and visualization

Proceedings - APGV 2006: Symposium on Applied Perception in ...

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

ISBN: (纸本)1595934294

The proceedings contain 28 papers. The topics discussed include: Stevens dot patterns for 2D flow visualization;minification influences spatial judgments in virtual environments;updating orientation in large virtual environments using scaled translational gain;discrimination and estimation of time-to-contact for approaching traffic using a desktop environment;categorization of natural scenes: local vs. global information;evaluation of supra-threshold perceptual metrics for 3D models;perception of image motion during head movement;a comparison of immersive HMD, fish tank VR and fish tank with haptics displays for volume visualization;large displays enhance spatial knowledge of a virtual environment;color perception of 3D objects: constancy with respect to variation of surface gloss;contrast enhancement of images using human contrast sensitivity;semantic 3D motion retargeting for facial animation;and the evaluation of stylized facial expressions.

关键词： visualization

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Interactive volumetric lighting simulating scattering and shadowing

Interactive volumetric lighting simulating scattering and sh...

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Pacific (formerly Asia-Pacific APVIS) visualization symposium

作者： Timo Ropinski Christian Döring Christof Rezk-Salama University of Münster Germany European Institue of Molecular Imaging (EIMI) Germany Mediadesign University of Applied Sciences Dusseldorf Germany

ISBN: (纸本)9781424466856;9781424466849

In this paper we present a volumetric lighting model, which simulates scattering as well as shadowing in order to generate high quality volume renderings. By approximating light transport in inhomogeneous participating media, we are able to come up with an efficient GPU implementation, in order to achieve the desired effects at interactive frame rates. Moreover, in many cases the frame rates are even higher as those achieved with conventional gradient-based shading. To evaluate the impact of the proposed illumination model on the spatial comprehension of volumetric objects, we have conducted a user study, in which the participants had to perform depth perception tasks. The results of this study show, that depth perception is significantly improved when comparing our illumination model to conventional gradient-based volume shading. Additionally, since our volumetric illumination model is not based on gradient calculation, it is also less sensitive to noise and therefore also applicable to imaging modalities incorporating a higher degree of noise, as for instance magnet resonance tomography or 3D ultrasound.

关键词： Light scattering Shadow mapping Lighting Resonance light scattering Computed tomography Ultrasonic imaging Computer graphics Mice visualization Magnetic separation

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A psychophysical study of dominant texture detection 09

A psychophysical study of dominant texture detection

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Lu, Jianye Garr-Schultz, Alexandra Dorsey, Julie Rushmeier, Holly Computer Graphics Group Yale University United States

ISBN: (纸本)9781605587431

Images of everyday scenes are frequently used as input for texturing 3D models in computer graphics. Such images include both the texture desired and other extraneous information. In our previous work [Lu et al. 2009], we defined dominant texture as a large homogeneous region in an input sample image and proposed an automatic method to detect dominant textures based on diffusion distance manifolds. In this work, we explore the identification of cases where diffusion distance manifolds fail, and consider the best alternative method for such cases. © 2009 ACM.

关键词： Image texture

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Quality assessment of fractalized NPR textures: A perceptual objective metric 09

Quality assessment of fractalized NPR textures: A perceptual...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Bénard, Pierre Thollot, Joëlle Sillion, François Grenoble Universities and CNRS - LJK INRIA Laboratoire Jean Kuntzmann France

ISBN: (纸本)9781605587431

Texture fractalization is used in many existing approaches to ensure the temporal coherence of a stylized animation. This paper presents the results of a psychological user-study evaluating the relative distortion induced by a fractalization process of typical medium textures. We perform a ranking experiment, assess the agreement among the participant and study the criteria they used. Finally we show that the average co-occurrence error is an efficient quality predictor in this context. © 2009 ACM.

关键词： Rendering (computer graphics)

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Evaluation of glyph-based multivariate scalar volume visualization techniques 09

Evaluation of glyph-based multivariate scalar volume visuali...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Feng, David Lee, Yueh Kwock, Lester Taylor II, Russell M. UNC Computer Science United States UNC Radiology United States

ISBN: (纸本)9781605587431

We present a user study quantifying the effectiveness of Scaled Data-Driven Spheres (SDDS), a multivariate three-dimensional data set visualization technique. The user study compares SDDS, which uses separate sets of colored sphere glyphs to depict variable values, to superquadric glyphs, an alternative technique that maps all variable values to a single glyph. User study participants performed tasks designed to measure their ability to estimate values of particular variables and identify relationships among variables. Results from the study show that users were significantly more accurate and faster for both tasks under the SDDS condition. © 2009 ACM.

关键词： Data visualization

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Investigating the effect of real-time stylisation techniques on user task performance 09

Investigating the effect of real-time stylisation techniques...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Redmond, Niall Dingliana, John Graphics Vision and Visualization Group Trinity College Dublin Ireland

ISBN: (纸本)9781605587431

In this paper, we present a perceptual experiment whose results aid the creation of non-photorealistic rendering (NPR) styles which can positively affect user task performance in real-time scenes. In a visual search task designed to test people's perception of abstracted scenes, different types of stylisation are used to investigate how reaction times can be affected. We show how NPR techniques compare against non-stylised renderings, compare the effectiveness of different styles, determine how varying each style can affect performance and investigate how these styles perform with objects of varying complexity. The results show that NPR can be a useful tool for increasing the saliency of target objects while reducing the visual impact of the rest of the scene. However, it is also shown that the success of each style depends largely on the scene context and also on the level of stylisation used. We believe the results from this study can help in the creation of effective NPR styles in the future. Supplementary material can be found at http://***/skrbal/ redmond/. © 2009 ACM.

关键词： Rendering (computer graphics)

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Human perception of quadruped motion 09

Human perception of quadruped motion

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Skrba, Ljiljana O'Sullivan, Carol

ISBN: (纸本)9781605587431

In our research we are interested in human sensitivity to differences in animal gaits. We use point light walkers as stimuli, and follow up with a study using a realistic 3D model. Previously it has been shown that humans can regonise human motion, gender and the identity of an actor from a set of moving points [1973;1977]. McDonnell et al. [2008] show that both shape and motion influence sex perception of virtual human characters. Mather and West [1993] have shown that people can recognise animals from pointlight displays. In order to find out whether we can tell the difference between animals using motion cues, we captured the motion of farm animals. © 2009 ACM.

关键词： Animals

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Optic flow and physical effort as cues for the perception of the rate of selfproduced motion in VE 09

Optic flow and physical effort as cues for the perception of...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Chihak, Benjamin Pick Jr., Herbert Plumert, Jodie Ziemer, Christine Babu, Sabarish Cremer, James Kearney, Joseph Departments of Psychology and Computer Science University of Iowa United States Institute of Child Development University of Minnesota United States

ISBN: (纸本)9781605587431

Understanding how humans perceive their rate of translational locomotion through the world is important for designing virtual environments. People have access to two primary classes of cues that can provide information about their movement through the environment: Visual and auditory cues (e.g. optic flow, optical expansion, Doppler shift) and somatosensory cues (e.g. effort, proprioceptive feedback.) An important research question is the relative weighting of these cues for perceiving the rate of translational movement in a virtual environment. © 2009 ACM.

关键词： Virtual reality

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visualization of Signal Transduction Processes in the Crowded Environment of the Cell

Visualization of Signal Transduction Processes in the Crowde...

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IEEE Pacific visualization symposium

作者： Falk, Martin Klann, Michael Reuss, Matthias Ertl, Thomas Univ Stuttgart VISUS Visualizat Res Ctr D-7000 Stuttgart Germany Univ Stuttgart Ctr Syst Biol Inst Biochem Engn D-7000 Stuttgart Germany

ISBN: (纸本)9781424444045

In this paper, we propose a stochastic simulation to model and analyze cellular signal transduction. The high number of objects in a simulation requires advanced visualization techniques: first to handle the large data sets, second to Support the human perception in the crowded environment, and third to provide an interactive exploration tool. To adjust the state of the cell to ail external signal, a specific set of signaling molecules transports the information to the nucleus deep inside the cell. There, key molecules regulate gene expression. Ill contrast to continuous ODE models we model all signaling molecules individually in a more realistic crowded and disordered environment. Beyond spatiotemporal concentration profiles our data describes the process on a mesoscopic, molecular level, allowing a detailed view of intracellular events. In Our proposed schematic visualization individual molecules, their tracks, or reactions can be selected and brought into focus to highlight the signal transduction pathway. Segmentation, depth cues and depth of field are applied to reduce the visual complexity. We also provide a virtual microscope to display images for comparison with wet lab experiments. The method is applied to distinguish different transport modes of MAPK (mitogen-activated protein kinase) signaling molecules in a cell. In addition, we simulate the diffusion of drug molecules through the extracellular space of a solid tumor and visualize the challenges in cancer related therapeutic drug delivery.

关键词： 1.3.3 [Computer graphics]: Picture/Image Generation 1.3.7 [Computer graphics]: Three-Dimensional graphics and Realism 1.3.8 [Computer graphics]: Applications 1.6.8 [Simulation and Modeling]: Types of Simulation-Discrete Event J.3 [Life and Medical Sciences]: Biology and Genetics

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The effects of continued exposure to medium field augmented and virtual reality on the perception of egocentric depth 09

The effects of continued exposure to medium field augmented ...

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APGV 2009: symposium on applied perception in graphics and visualization

作者： Jones, J. Adam Swan II, J. Edward Singh, Gurjot Franck, Josh Ellis, Stephen R. Mississippi State University Mississippi MS United States NASA Ames Research Center United States

ISBN: (纸本)9781605587431

Research in the perception of depth in augmented and virtual reality has reported a consistent underestimation of egocentric depth with regard to stationary objects located along the ground plane. However, there has been a rather large disparity in the degree of underestimation reported from study to study with some studies reporting as much as a 68% underestimation of egocentric depth while others report as little as 6% [Jones et al. 2008]. The current study investigates the judgment of egocentric distance in real, augmented, and virtual environments and finds that subjects' judgments improve in accuracy as exposure continues in the absence of explicit feedback. © 2009 ACM.

关键词： Virtual reality

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