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检索条件"机构=Cornell University Program of Computer Graphics"

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A framework for realistic image synthesis 97

A framework for realistic image synthesis

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24th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1997

作者： Greenberg, Donald P. Torrance, Kenneth E. Shirley, Peter Arvo, James Lafortune, Eric Ferwerda, James A. Walter, Bruce Trumbore, Ben Pattanaik, Sumanta Foo, Sing-Choong Program of Computer Graphics Cornell University 580 Frank H.T. Rhodes Hall Ithaca United States Department of Computer Science University of Utah United States Department of Computer Science California Institute of Technology United States Blue Sky Studios Harrison NY United States

ISBN: (纸本)0897918967

Our goal is to develop physically based lighting models and perceptually based rendering procedures for computer graphics that will produce synthetic images that are visually and measurably indistinguishable from real-world images. Fidelity of the physical simulation is of primary concern. Our research framework is subdivided into three sub-sections: the local light reflection model, the energy transport simulation, and the visual display algorithms. The first two subsections are physically based, and the last is perceptually based. We emphasize the comparisons between simulations and actual measurements, the difficulties encountered, and the need to utilize the vast amount of psychophysical research already conducted. Future research directions are enumerated. We hope that results of this research will help establish a more fundamental, scientific approach for future rendering algorithms. This presentation describes a chronology of past research in global illumination and how parts of our new system are currently being developed.

关键词： Light reflection

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Dynamic simulation of non-penetrating flexible bodies 92

Dynamic simulation of non-penetrating flexible bodies

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Proceedings of the 19th annual conference on computer graphics and interactive techniques

作者： David Baraff Andrew Witkin Program of Computer Graphics Cornell University Ithaca NY School of Computer Science Carnegie Mellon University Pittsburgh PA

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Functional difference predictors (FDPs): measuring meaningful image differences

Functional difference predictors (FDPs): measuring meaningfu...

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Asilomar Conference on Signals, Systems & computers

作者： J.A. Ferwerda F. Pellacini Program of Computer Graphics Cornell University Pixar Animation Studios Emeryville Emeryville CA USA

In this paper we introduce functional difference predictors (FDPs), a new class of perceptually-based image difference metrics that predict how image errors affect the ability to perform visual tasks using the images. To define the properties of FDPs, we conduct a psychophysical experiment that focuses on two visual tasks: spatial layout and material estimation. In the experiment we introduce errors in the positions and contrasts of objects reflected in glossy surfaces and ask subjects to make layout and material judgments. The results indicate that layout estimation depends only on positional errors in the reflections and material estimation depends only on contrast errors. These results suggest that in many task contexts, large visible image errors may be tolerated without loss in task performance, and that FDPs may be better predictors of the relationship between errors and performance than current visible difference predictors (VDPs).

关键词： Reflection Rendering (computer graphics) computer graphics computer errors Pixel Performance evaluation Conducting materials Performance loss Layout Animation

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Real-time robot motion planning using rasterizing computer graphics hardware 90

Real-time robot motion planning using rasterizing computer g...

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Proceedings of the 17th annual conference on computer graphics and interactive techniques

作者： Jed Lengyel Mark Reichert Bruce R. Donald Donald P. Greenberg Graduate Student Program of Computer Graphics Cornell University Ithaca N.Y. Assistant Professor and Director Computer Science Robotics Laboratory Department of Computer Science 4130 Upson HalI Cornell University Ithaca N.Y. Director Program of Computer Graphics Jacob Gould Shurman Professor of Computer Graphics Cornell University Ithaca N.Y.

ISBN: (纸本)9780897913447

We present a real-time robot motion planner that is fast and complete to a resolution. The technique is guaranteed to find a path if one exists at the resolution, and all paths returned are safe. The planner can handle any polyhedral geometry of robot and obstacles, including disjoint and highly concave unions of *** planner uses standard graphics hardware to rasterize configuration space obstacles into a series of bitmap slices, and then uses dynamic programming to create a navigation function (a discrete vector-valued function) and to calculate paths in this rasterized space. The motion paths which the planner produces are minimal with respect to an L1 (Manhattan) distance metric that includes rotation as well as *** examples are shown illustrating the competence of the planner at generating planar rotational and translational plans for complex two and three dimensional robots. Dynamic motion sequences, including complicated and non-obvious backtracking solutions, can be executed in real time.

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The zonal method for calculating light intensities in the presence of a participating medium 87

The zonal method for calculating light intensities in the pr...

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14th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1987

作者： Rushmeier, Holly E. Torrance, Kenneth E. Program of Computer Graphics Rand Hall IthacaNY14853 United States Sibley School of Mechanical and Aerospace Engineering Upson Hall IthacaNY14853 United States Cornell University IthacaNY14853 United States

ISBN: (纸本)0897912276

The zonal method for calculating radiative transfer in the presence of a participating medium is applied to the generation of realistic synthetic images. The method generalizes the radiosity method and allows for emission, scattering, and absorption by a participating medium. The zonal method accounts for volume/surface interactions which have not been previously included, as well as volume/volume and surface/surface interactions. In addition, new algorithms, based on the hemi-cube formulation, are introduced for calculating the geometric factors required by the zonal method.

关键词： Light scattering

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Visual navigation of large environments using textured clusters 95

Visual navigation of large environments using textured clust...

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Proceedings of the 1995 symposium on Interactive 3D graphics

作者： Paulo W. C. Maciel Peter Shirley Department of Computer Science Lindley Hall Indiana University Bloomington Indiana Program of Computer Graphics Cornell University Ithaca New York

ISBN: (纸本)9780897917360

A visual navigation system is described which uses texture mapped primitives to represent clusters of objects to maintain high and approximately constant frame rates. In cases where there are more unoccluded primitives inside the viewing frustum than can be drawn in real-time on the workstation, this system ensures that each visible object, or a cluster that includes it, is drawn in each frame. The system supports the use of traditional “level-of-detail” representations for individual objects, and supports the automatic generation of a certain type of level-of-detail for objects and clusters of objects. The concept of choosing a representation from among those associated with an object that accounts for the direction from which the object is viewed is also supported. The level-of-detail concept is extended to the whole model and the entire scene is stored as a hierarchy of levels-of-detail that is traversed top-down to find a good representation for a given viewpoint. This system does not assume that visibility information can be extracted from the model and is thus especially suited for outdoor environments.

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A practitioners' assessment of light reflection models

A practitioners' assessment of light reflection models

引用

Pacific Conference on computer graphics and Applications

作者： P. Shirley B. Smits H. Hu E. Lafortune Computer Science Department University of Utah Salt Lake UT USA Program of Computer Graphics Cornell University Ithaca NY USA

We discuss the theory and practical issues behind creating reflection models to show the difficulty of the problem. We survey the current approaches towards reflection models for computer graphics to show that even for simple surfaces, the important issues are far from settled. We briefly discuss future directions for research. Finally, we present a case study of a particular type of light reflection that captures some important aspects of appearance for a limited class of materials with subsurface reflection.

关键词： Optical reflection Optical polarization Rough surfaces Surface roughness computer science Cities and towns Image generation Layout computer graphics Optical scattering

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The challenge of CAD/CAM education 82

The challenge of CAD/CAM education

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Proceedings of the 9th annual conference on computer graphics and interactive techniques

作者： Michel A. Melkanoff Frank Puhl Victor Langer Donald P. Greenberg Mark S. Shepard Herb Voelcker UCLA President CADAM Inc. Computer Graphics Project Director Milwaukee Area Technical College Director Program of Computer Graphics Cornell University Rensselaer Polytechnic Institute Production Automation Project University of Rochester

ISBN: (纸本)9780897910767

Colleges and universities are not meeting industry needs for graduates trained in the use or implementation of computer-aided design and manufacturing systems since few schools have experience in teaching CAD/CAM. Furthermore, many Bachelor's-level graduates are going directly into industry, rather than pursuing graduate degrees, thereby compounding this problem. Members of this panel represent both schools and industry and together attempt to outline approaches to developing more extensive CAD/CAM emphasis in education, including- the role colleges and universities can or should play in addressing industry needs in this area- user- and implementor-oriented CAD/CAM education- CAD/CAM education as an integral part of university engineering curricula- problems encountered in organizing and implementing CAD/CAM curriculum- universities' relationships with *** is our hope that panelists' experiences will help guide schools in structuring CAD/CAM programs to best insure that the United States remain at the forefront of technology and compete industrially *** PuhlVictor LangerDonald P. GreenbergMark S. ShepardHerb VoelckerUniversities' Relationships With IndustryFrank PuhlAmerican industry needs engineers who have been brought up with the realization that computers are intimately involved in all aspects of design, analysis, and manufacturing. Industry, of course, needs engineers who are already trained in fundamental CAD/CAM principles and in solving real world problems using computers, as well as those who have been taught to be productivity- and *** help meet these needs, we must now provide answers to several significant questions:What part should industry play in encouraging and sponsoring research and education in CAD/CAM?How can we resolve conflicts between industries' “trade secrets” and universities' “open research”?How can industry and educational institutions work together to increase U.S. productivity so as to regain our compe

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Improving interaction with radiosity-based lighting simulation programs 90

Improving interaction with radiosity-based lighting simulati...

引用

1990 Symposium on Interactive 3D graphics, I3D 1990

作者： Puech, Claude Sillion, François Vedel, Christophe Laboratoire d'Informatique Ecole Normale Supérieure 45 rue d'Ulm Paris75005 France Program of Computer Graphics Cornell University 120 Rand Hall IthacaNY14853 United States LIBNS URA 1327 CNRS France LIENS France

ISBN: (纸本)0897913515

We describe the main algorithms used in an interactive lighting simulation program based on a twopass extension of the radiosity method. The system allows interactive walk-through as other systems based on radiosity calculations. Moreover, it offers increased realism in the lighting effects by use of extended form factors which accounts for "specular reflection of diffuse light", fast production and display of progressively refined images by distribution of the calculations, good quality of the images in the early stages of the refinement by the use of "hardware light sources", "cheap" rendering of some of the specular highlights at any time by use of the built-in specular shading model, lighting modification (color, intensity of the light sources) by use of "negative light", fast simulation of mirror effects and interactive tools for controling the quality of the final image. © 1990 ACM.

关键词： Light sources

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Let's get emotional: Emotion research in human computer interaction

Let's get emotional: Emotion research in human computer inte...

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25th SIGCHI Conference on Human Factors in Computing Systems 2007, CHI 2007

作者： Crane, Elizabeth A. Shami, N. Sadat Peter, Christian University of Michigan Division of Kinesiology 401 Washtenaw Ave. Ann Arbor MI 48109-2214 United States Information Science Program Cornell University Ithaca NY 14850 United States Fraunhofer Institute for Computer Graphics Joachim Jungius Str. 11 18059 Rostock Germany

ISBN: (纸本)1595936424

Emotion is a topic of growing interest in the HCI community. Studying emotion within the HCI discipline is an exciting interdisciplinary task. This can be facilitated by the exchange of thoughts and ideas with others working on related projects. The aim of this SIG is to bring together an interdisciplinary group of researchers and practitioners actively working on projects where emotion is an essential component. The goals of the SIG are to identify current themes related to emotion specific HCI work and discuss strategies for moving forward.

关键词： Human computer interaction

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