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

Depth-of-field-based alpha-matte extraction

引用

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

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

引用

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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Perceptually optimizing textures for layered surfaces 05

Perceptually optimizing textures for layered surfaces

引用

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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Exploitation of human shadow perception for fast shadow rendering 05

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

引用

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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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...

引用

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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Layered motion field visualization: Perceptual issues 05

Layered motion field visualization: Perceptual issues

引用

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

作者： Langer, M.S. Rekhi, D. Pereira, J. Bhatia, A. McGill University Montreal Canada

ISBN: (纸本)1595931392

Layered motion fields arise in natural vision in many situations, including self-motion in a cluttered scene, motion of a fluid, and transparency. Layered motion fields have the property that there are multiple velocities present near each 2D spatial location. As such, standard 2D motion visualization methods do not apply, since they allow for only a single velocity vector at each image position. This paper examines perceptual issues that arise in visualizing layered motion fields. A key issue is that the human visual system is severely limited in how well it can process such fields. We give a thorough review of the relevant psychophysical literature, and focus on experiments that test how well the human visual system can detect spatial discontinuities and discrete layers in motion fields. We then present a specific layered motion visualization method. We demonstrate the limitations of the human visual system in perceiving the layered motions produced by this method. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： visualization

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A multiresolution color model for visual difference prediction 05

A multiresolution color model for visual difference predicti...

引用

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

作者： Tolhurst, David J. Ripamonti, Caterina Párraga, C. Alejandro Lovell, P. George Troscianko, Tom Department of Physiology University of Cambridge Department of Experimental Psychology University of Bristol

ISBN: (纸本)1595931392

How different are two images when viewed by a human observer? Such knowledge is needed in many situations including when one has to judge the degree to which a graphics representation may be similar to a high-quality photograph of the original scene. There is a class of computational models which attempt to predict such perceived differences. These are derived from theoretical considerations of human vision and are mostly validated from experiments on stimuli such as sinusoidal gratings. We are developing a model of visual difference prediction based on multi-scale analysis of local contrast, to be tested with psychophysical discrimination experiments on natural-scene stimuli. Here, we extend our model to account for differences in the chromatic domain. We describe the model, how it has been derived and how we attempt to validate it psychophysically for monochrome and chromatic images. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Computer graphics

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A comparison of material and illumination discrimination performance for real rough, real smooth and computer generated smooth spheres 05

A comparison of material and illumination discrimination per...

引用

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

作者： Te Pas, Susan F. Pont, Sylvia C. Social Sciences Helmholtz Institute Utrecht University Physics and Astronomy Helmholtz Institute Utrecht University

ISBN: (纸本)1595931392

The appearance of objects in natural scenes is determined by their reflectance, their 3D texture, their shape and by the nature of the illumination. Results of previous experiments using computer generated images of spheres with different reflectance modes and under different canonical illuminations suggested that perception of reflectance mode and illumination are basically confounded. In the present study we investigate whether the conclusions from the experiments with simplified rendered spheres can be extended to ecologically valid images. We use two sets of photographs of real spheres, the first set is taken from the Dror Database [Dror et al. 2001], with simple reflectance modes but complex natural illumination (e.g. desklamp, lab, foodcourt). The second set is taken from the Utrecht Oranges Database [Pont and Koenderink 2003], with simple canonical illumination but material consisting of both reflectance and 3D texture differences (e.g. orange, golf ball, christmas decoration). We find that, although to a lesser extent, even in images of complex objects, perception of material and illumination are basically confounded. Overall, illumination and material are confounded most when we present rendered spheres that differ only in reflectance mode under simple canonical illumination conditions. Interestingly, adding complex natural illumination containing higher order angular frequencies helps to disambiguate this confound in material judgments, but not in illumination judgments. Most helpful was the addition of 3D texture. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Computer graphics

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Reevaluating stereo and motion cues for visualizing graphs in three dimensions 05

Reevaluating stereo and motion cues for visualizing graphs i...

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

作者： Ware, Colin Mitchell, Peter Data Visualization Research Lab. CCOM University of New Hampshire

ISBN: (纸本)1595931392

It has been known for some time that larger graphs can be interpreted if viewed in 3D than in 2D. Both kinetic depth cues and stereoscopic depth cues increase the size of the structure that can be interpreted, However, prior studies were carried out using displays that provided a level of detail far short of what the human visual system is capable of resolving. This is especially problematic because human stereoscopic vision is known to be a super-acuity, it operates best under conditions where fine details are present. Therefore we undertook a graph comprehension study using a very high resolution stereoscopic display. We examined the effect of stereo, kinetic depth and using 3D tubes versus lines to display the links, The results showed a much greater benefit for 3D viewing than previous studies. For example, with both motion and depth cues, unskilled observers could see paths between nodes in 333 node graphs with a better than 10% error rate. Skilled observers could see up to a 1000 node graph with less than a 10% error rate. This represented an order of magnitude increase over 2D display. These findings are discussed in terms of their implications for information display. Copyright © 2005 by the Association for Computing Machinery, Inc.

关键词： Graphic methods

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Modeling volume textures

Modeling volume textures

引用

Fourth International Workshop on Volume graphics 2005

作者： Rushmeier, Holly Department of Computer Science Yale University ACM Publications Board IEEE Computer Graphics and Applications Computer Graphics Forum ACM Transactions on Applied Perception

ISBN: (纸本)3905673266

Since their introduction in seminal papers by Peachey and Perlin in 1985, volume textures have been a popular modeling tool. Not only are they useful for creating complex and consistent textures, they are needed for rendering weathering effects on various materials such as stone, as demonstrated by Dorsey et al. in 1999. While it is possible to generate volume textures purely procedurally, recent interest in 2D texture synthesis from example has spurred interest in synthesizing volumetric textures from physical example. I will present applications where volume textures from samples are of interest, some approaches to estimating them, and some early work on evaluating whether the synthesized volumes are correct.

关键词： Computer aided software engineering

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