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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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Proceedings - apgv 2005: 2nd symposium on applied perception in graphics and visualization: Preface

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

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Proceedings - apgv 2005: 2nd symposium on applied perception in graphics and visualization 2005年 7-7页

作者： Bulthoff, Heinrich H. Troscianko, Tom Max-Planck Institute for Biological Cybernetics Tübingen Germany University of Bristol United Kingdom

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ISBN: (纸本)1595931392

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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

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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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Depth-of-field-based alpha-matte extraction 05

Depth-of-field-based alpha-matte extraction

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

作者： Reinhard, Erik Khan, Erum Arif University of Central Florida School of Computer Science University of Central Florida CSB Orlando FL 32816

ISBN: (纸本)1595931392

In compositing applications, objects depicted in images frequently have to be separated from their background, so that they can be placed in a new environment. Alpha mattes are important tools aiding the selection of objects, but cannot normally be created in a fully automatic way. We present an algorithm that requires as input two images - one where the object is in focus, and one where the background is in focus - and then automatically produces an alpha matte indicating which pixels belong to the object. This algorithm is inspired by human visual processing and involves nonlinear response compression, center-surround mechanisms as well as a filling-in stage. The output can then be refined with standard computer vision techniques. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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Exploitation of human shadow perception for fast shadow rendering 05

Exploitation of human shadow perception for fast shadow rend...

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

作者： Sattler, Mirko Sarlette, Ralf Mücken, Thomas Klein, Reinhard University of Bonn Institute for Computer Science II Bonn Germany

ISBN: (纸本)1595931392

In this paper we describe an experiment to obtain information about the perceptual potential of the human visual system regarding shadow perception. Shadows play an important part for communicating spatial structures of objects to the observer. They are also essential for the overall realism of the rendered image. Unfortunately, most algorithms in computer graphics which are capable of producing realistic shadows are computationally expensive. The main idea behind the experiment is to use a simplified version of the shadow caster to generate hard and soft shadows, which would rapidly increase performance and to evaluate up to which degree a simplification is possible, without producing noticeable errors. Therefore, an experiment is performed, in which the test persons should mark the point of the just noticeable difference. First results show, that a mesh simplified to only 1% of its original complexity is capable to cast soft shadows that satisfy 90% of the test persons. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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Perceptually optimizing textures for layered surfaces 05

Perceptually optimizing textures for layered surfaces

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

作者： Bair, Alethea House, Donald Ware, Colin Texas A and M University University of New Hampshire

ISBN: (纸本)1595931392

In this paper, we take a new look at the problem of texturing surfaces so that they can be displayed layered over each other but remain clearly visible. Finding optimal textures that solve this problem is complex because of the perceptual interactions between the visual effects of parameters controlling texture generation. Instead of using controlled experiments to investigate this problem, we use a genetic algorithm based human-in-the-loop parameter space search to build a large database of human-rated textures. This database is then analyzed with a variety of data-mining techniques, including clustering, principle component analysis, neural networks, and histogram analysis. We detail this analysis, concluding with a set of guidelines for building strong layered surface textures, and a display of a number of example textures. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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A perceptual framework for contrast processing of high dynamic range images 05

A perceptual framework for contrast processing of high dynam...

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

作者： Mantiuk, Rafal Myszkowski, Karol Seidel, Hans-Peter MPI Informatik

ISBN: (纸本)1595931392

In this work we propose a framework for image processing in a visual response space, in which contrast values directly correlate with their visibility in an image. Our framework involves a transformation of an image from luminance space to a pyramid of low-pass contrast images and then to the visual response space. After modifying response values, the transformation can be reversed to produce the resulting image. To predict the visibility of suprathreshold contrast, we derive a transducer function for the full range of contrast levels that can be found in High Dynamic Range images. We show that a complex contrast compression operation, which preserves textures of small contrast, is reduced to a linear scaling in the proposed visual response space. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Sensory perception

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What you don't look at is what you get: Anti-saccades can reduce the Midas Touch-problem 05

What you don't look at is what you get: Anti-saccades can re...

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

作者： Huckauf, Anke Goettel, Timo Urbina, Mario Heinbockel, Malte Bauhaus-University Weimar

ISBN: (纸本)1595931392

Controlling computers by eyes can provide a fast and efficient alternative to the computer mouse. However, in gaze controlled systems object selection is still suboptimal: Dwell times on a certain object typically used to elicit the selection of this object can cause unintended selections;a problem known as Midas Touch. For our suggested alternative approach using anti-saccades for selection, highlighted objects are copied to one side of the object. The object is selected when fixating to the side opposed to that copy requiring to inhibit an automatic response towards new objects. A user study revealed shorter task completion times, but more errors when selecting objects by anti-saccades relative to selection by individually and task-specifically adapted dwell times. With certain improvements, anti-saccades can become a serious alternative to dwell times. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Computer graphics

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