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共 101 条记录，以下是81-90 订阅

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Example-based color stylization based on categorical perception

Example-based color stylization based on categorical percept...

引用

proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Chang, Youngha Uchikawa, Keiji Saito, Suguru Nakajima, Masayuki Dept. of Computer Science Grad. Sch. of Info. Sci. and Eng. Tokyo Institute of Technology Dept. of Information Processing Interdisc. Grad. Sch. Sci. and Eng. Tokyo Institute of Technology

ISBN: (纸本)1581139144

We describe a new computational approach to stylize the colors of an image by using a reference image. During processing, we take characteristics of human color perception into account to generate more appealing results. Our system starts by classifying each pixel value into one of a set of the basic color categories, derived from our psycho-physiological experiments. The basic color categories are perceptual categories that are universal to everyone, regardless of nationality or cultural background. These categories provide restrictions on the color transformations to avoid generating unnatural results. Our system then renders a new image by transferring colors from a reference image to the input image, based on this categorizations. To avoid artifacts due to the explicit clustering, our system defines fuzzy categorization when pseudo-contours appear in the resulting image. We present a variety of results and show that our color transformation performs a large, yet natural color transformation without any sense of incongruity, and that the resulting images automatically capture the characteristics of the color use of the reference image.

关键词： Color image processing

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Workspace calibration via perceptual judgments 04

Workspace calibration via perceptual judgments

引用

proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Sundareswara, Rashmi Schrater, Paul University of Minnesota United States

ISBN: (纸本)1581139144

3D graphic scenes are only correctly rendered for one viewpoint. Without laborious calibration, however, observers seldom view the monitor from this viewpoint. Even in visual experiments using headrests, inter-subject variability in head-size and eye position result in many subjects viewing the display "off-axis", producing well known distortions in perceptual judgments. The goal is to correctly render graphic displays for the application/experiment based on a simple set of perceptual judgments made by the user. We have two approaches. Our first approach uses point matches between points on a transparency and 3D haptic points that the user makes with the Phantom device. We use well-known calibration techniques from Computer Vision to estimate the transformation matrix between the mirror and the monitor and also the position of the eye. This method requires the presence of a 3D calibrated object (Phantom, in our case). Our second method uses the same transparency and user-adjustable points on the monitor to derive a transformation matrix between mirror and monitor, as well as the position of the eye. This method does not require the presence of a calibrated object and hence is more generally applicable.

关键词： Three dimensional computer graphics

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Distance perception in real and virtual environments 04

Distance perception in real and virtual environments

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Plumert, Jodie M. Kearney, Joseph K. Cremer, James F. Department of Psychology University of Iowa United States Computer Science Department University of Iowa United States

ISBN: (纸本)1581139144

Two experiments were conducted to compare distance perception in real and virtual environments. In Experiment 1, adults estimated how long it would take to walk to targets in real and virtual environments by starting and stopping a stopwatch while looking at a target person standing between 20 and 120 ft away. The real environment was a large grassy lawn in front of a university building. We replicated this scene in our virtual environment using a nonstereoscopic, large screen immersive display system. We found that people underestimated time to walk in both environments for distances of 40-60 ft and beyond. However, time-to-walk estimates were virtually identical across the two environments. In Experiment 2, 10- and 12-year-old children and adults estimated time to walk in real and virtual environments both with and without vision. Adults again underestimated time to walk in both environments for distances of 60 ft and beyond. Again, their estimates were virtually identical in the real and virtual environment both with and without vision. Children's time-to-walk estimates were also very similar across the two environments under both viewing conditions. We conclude that distance perception may be better in virtual environments involving large screen immersive displays than those involving head mounted displays (HMDs).

关键词： Virtual reality

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Frames of reference in virtual object rotation 04

Frames of reference in virtual object rotation

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Ware, Colin Arsenault, Roland Data Visualization Research Lab. Center for Coastal and Ocean Mapping University of New Hampshire United States

ISBN: (纸本)1581139144

It is difficult with most current computer interfaces to rotate a virtual object so that it matches the orientation of another virtual object. Times to perform this simple task can exceed 20 seconds whereas the same kind of rotation can be accomplished with real objects and with some VR interfaces in less than two seconds. In many advanced 3D user interfaces, the hand manipulating a virtual object is not in the same place as the object being manipulated. The available evidence suggests that this is not usually a significant problem for manipulations requiring translations of virtual objects, but it is when rotations are required. We hypothesize that the problems may be caused by frame of reference effects - mismatches between the visual frame of reference and the haptic frame of reference. Here we report two experiments designed to study interactions between visual and haptic reference frames space. In our first study we investigated the effect of rotating the frame of the controller with respect to the frame of the object being rotated. We measured a broad U-shaped relationship. Subjects could tolerate quite large mismatches, but when the orientation mismatch approached 90 degrees performance deteriorated rapidly by up to a factor of 5. In our second experiment we manipulated both rotational and translational correspondence between visual and haptic frames of reference. We predicted that the haptic reference frame might rotate in egocentric coordinates when the input device was in a different location than the virtual object. The experimental results showed a change in the direction predicted;they are consistent with a rotation of the haptic frame of reference, although only by about half the magnitude predicted. Implications for the design of control devices are discussed.

关键词： Object recognition

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A feasibility test for perceptually adaptive level of detail rendering on desktop systems 04

A feasibility test for perceptually adaptive level of detail...

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proceedings - 1st symposium on applied perception in graphics and visualization, APGV 2004

作者： Parkhurst, Derrick Niebur, Ernst Zanvyl Krieger Mind/Brain Institute Johns Hopkins University Baltimore MD United States

ISBN: (纸本)1581139144

Level of detail (LOD) rendering techniques reduce the geometric complexity of 3D models, sacrificing visual rendering quality in order to increase frame rendering rates. Perceptually adaptive LOD rendering techniques take into account the characteristics of the human visual system to minimize visible artifacts attributable to the reduced LOD. While these techniques have been previously examined in the context of high-performance rendering systems, it is not clear whether the benefits will necessarily overcome the behavioral costs associated with a reduced LOD on ordinary desktop systems. To answer this question, two perceptually adaptive rendering techniques, one velocity-dependent and one gaze-contingent, were implemented in the Unreal™ rendering engine on a standard desktop computer and monitor. These techniques were evaluated in separate experiments where participants were required to perform a virtual search for a target object among distractor objects in a perceptually rendered virtual home interior using a mouse to rotate the viewport. In the first experiment, objects moving across the observer's field of view were rendered in less detail than stationary objects, taking advantage of the fact that visual sensitivity to the details of moving objects is substantially reduced. Reaction times to detect the target remained constant with decreasing detail, whereas reaction times to localize a target decreased. In a second experiment, an eye tracker was used to render objects at the point of gaze in more detail than objects in the periphery, taking advantage of the fact that visual sensitivity is greatest at that location. Reaction times to detect the target increased with decreasing detail, whereas reaction times to localize a target decreased. The results from these experiments suggest that a reduced LOD can impede target identification, however, the resultant increase in frame rates facilitates virtual interaction. Overall, the behavioral costs associated with perc

关键词： Sensory perception

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Example-based color stylization based on categorical perception 04

Example-based color stylization based on categorical percept...

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proceedings of the 1st symposium on applied perception in graphics and visualization

作者： Youngha Chang Keiji Uchikawa Suguru Saito Tokyo Institute of Technology

ISBN: (纸本)9781581139143

关键词： basic color category color transfer example-based

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A toolkit for visualizing biomedical data sets 03

A toolkit for visualizing biomedical data sets

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1st International Conference on Computer graphics and Interactive Techniques in Australasia and South East Asia, GRAPHITE '03

作者： Wünsche, Burkhard C. Graphics Group Dept. of Computer Science University of Auckland Auckland New Zealand

ISBN: (纸本)1581135785

Medical data sets now comprise a diverse range of measurements such as tissue densities, sensitivity to magnetization, blood flow velocity, and material strain. The size and complexity of medical data sets makes it increasingly difficult to understand, compare, analyze and communicate the data. visualization is an attempt to simplify these tasks according to the motto "An image says more than a thousand words". Representing complex material properties, such as strain, as a single image improves the perception of features and pattern in the data, enables the recognition of relationship between different measures and facilitates the navigation through and interaction with complex and disparate sets of *** paper introduces a toolkit developed for exploring complex biomedical data sets. The contributions of this paper are threefold: we suggest a modular design which facilitates the comparison and exploration of multiple data sets and visualization. We introduce a novel field data structure which allows interactive creation of new fields and we present boolean filters as a universal visualization tool. Copyright © 2003 by the Association for Computing Machinery, Inc.

关键词： User interfaces

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f3d - A file format an tools for storage an manipulation of volumetric data sets 1

f3d - A file format an tools for storage an manipulation of ...

引用

1st International symposium on 3D Data Processing visualization and Transmission, 3DPVT 2002

作者： Šrámek, M. Dimitrov, L.I. Commission for Scientific Visualization Austrian Academy of Sciences Donau-City-Str. 1 ViennaA-1220 Austria

ISBN: (纸本)0769515215

Different file formats for storage and manipulation of volumetric data exist today, but none of them has been accepted as a standard by the volume visualization and volume graphics communities until now. This paper tries to change this situation by proposing a new, freely available file format f3d, which, as we believe, fulfills the demands of research and educational environments. We hope that this new format will be accepted by the above mentioned communities and thus will provide a basis for improved communication between different groups and applications. © 2002 IEEE.

关键词： Data visualization

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Function-based 3D web visualization 1

Function-based 3D web visualization

引用

1st International symposium on Cyber Worlds, CW 2002

作者： Min, Lai Feng Sourin, A. Levinski, K. Creative Technology Ltd. Singapore Singapore Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769518621

This paper describes how the web-based visualization can be greatly improved using the function-based shape modeling technique. The improvement is possible because the proposed function-defined VRML shape node allows the content creators to describe any complex models with relatively small functions compared to the large-size polygonal mesh based VRML nodes. These function-defined shapes can be used together with the common VRML shapes. The proposed node has a few implementations capable of visualizing geometric shapes defined with HyperFun language as well as in any proprietary function-defined data formal. For fast visualization of the function-defined shapes, we have developed an improved continuation polygonization algorithm specifically designed for VRML visualization. The design, the implementation details, and the application examples of the proposed node are discussed. © 2002 IEEE.

关键词： Three dimensional computer graphics

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Advanced three-dimensional television system technologies 1

Advanced three-dimensional television system technologies

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1st International symposium on 3D Data Processing visualization and Transmission, 3DPVT 2002

作者： Redert, A. De Beeck, M.O. Fehn, C. IJsselsteijn, W. Pollefeys, M. Van Gool, L. Ofek, E. Sexton, I. Surman, P. Philips Research Laboratories Prof. Holstlaan 4 Eindhoven5656 AA Netherlands Heinrich-Hertz Institute Einsteinufer 37 BerlinD-10587 Germany Eindhoven University of Technology Den Dolech 2 Eindhoven5600 MB Netherlands Katholieke Universiteit Leuven Kasteelpark Arenberg 10 Heverlee3001 Belgium 3DV Systems Industrial Park Building 7 Yokneam20692 Israel De Montfort University The Gateway LeicesterLE1 9BH United Kingdom

ISBN: (纸本)0769515215

We describe the goals of the ATTEst project, which started in March 2002 as part of the Information Society Technologies (Ist) programme, sponsored by the European Commission. In the 2-year project, several industrial and academic partners cooperate towards a flexible, 2D-compatible and commercially feasible 3D-TV system-for broadcast environments. An entire 3D-video chain will be developed. We discuss the goals for content creation, coding, transmission, display and the central role that human 3D perception research will play in optimizing the entire chain. The goals include the development of a new 3D camera, algorithms to convert existing 2D-video material into 3D, a 2D-compatible coding and transmission scheme for 3D video using MPEG-2/4/7, and two new autostereoscopic displays. With the combination of industrial and academic partners and the technological progress obtained from earlier 3D projects, we expect to achieve the ATTEst goal of developing the first commercially feasible European 3D-TV broadcast system. © 2002 IEEE.

关键词： Cameras

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