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Final program and Proceedings of the 6th IS and T/SID Color Imaging Conference: Color Science, Systems and Applications

作者： Pattanaik, Sumanta N. Fairchild, Mark D. Ferwerda, James A. Greenberg, Donald P. Program of Computer Graphics Cornell University Ithaca NY 14853 United States Center for Imaging Science RIT Rochester NY 14623-5604 United States

A study was performed on multiscale model of adaptation, spatial vision and color appearance. The aim of the model is to predict various visual phenomena which simple tristimulus colorimetry can not adequately describe. The model simulates luminance, pattern and color processing of the human visual system to accurately predict the color appearance attributes of spectral stimuli in complex surroundings under a wide range of illumination and viewing conditions.

关键词： Color vision

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Validation of global illumination simulations through CCD camera measurements

Validation of global illumination simulations through CCD ca...

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Final program and Proceedings of the 5th IS and T/SID Color Imaging Conference: Color Science, Systems and Applications

作者： Pattanaik, Sumanta N. Ferwerda, James A. Torrance, Kenneth E. Greenberg, Donald Program of Computer Graphics Cornell University Ithaca NY 14853 United States

A technique for calibrating a charge coupled devices (CCD) camera for direct colorimetric comparison between the captured images of the real environment and synthetic images of the simulated environments is presented. The comparison is used to validate lighting algorithms used for computing synthetic images. The calibration model relating the pixel signal to various physical factors is tested using the CCD camera and an integrating sphere uniform light source.

关键词： Lighting

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A model of visual masking for computer graphics 97

A model of visual masking for computer graphics

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

作者： Ferwerda, James A. Shirley, Peter Pattanaik, Sumanta N. Greenberg, Donald P. Program of Computer Graphics Cornell University 580 Rhodes Hall Ithaca United States University of Utah United States

ISBN: (纸本)0897918967

In this paper we develop a computational model of visual masking based on psychophysical data. The model predicts how the presence of one visual pattern aects the detectability of another. The model allows us to choose texture patterns for computer graphics images that hide the eects of faceting, banding, aliasing, noise and other visual artifacts produced by sources of error in graphics algorithms. We demonstrate the utility of the model by choosing a texture pattern to mask faceting artifacts caused by polygonal tesselation of a flat-shaded curved surface. The model predicts how changes in the contrast, spatial frequency, and orientation of the texture pattern, or changes in the tesselation of the surface will alter the masking eect. The model is general and has uses in geometric modeling, realistic image synthesis, scientic visualization, image compression, and image-based rendering. Copyright © 1997 by the Association for Computing Machinery, Inc.

关键词： Image compression

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Act: an easy-to-use and dynamically extensible 3D graphics library

Act: an easy-to-use and dynamically extensible 3D graphics l...

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Brazilian Symposium on computer graphics and Image Processing (SIBGRAPI)

作者： W. Celes J. Corson-Rikert Program of Computer Graphics Cornell University USA

The paper presents Act, an object oriented library for projects from specialized 3D graphics applications to simple interactive educational programs. Act meets the needs of both occasional and expert graphics programmers, offering a high level access to the OpenGL library and additional features including object creation, manipulation, and interaction. An interpreted language allows the Act library to be extended easily and dynamically.

关键词： programming profession computer graphics Layout Software libraries Graphical user interfaces Application software Educational programs Dynamic programming Rendering (computer graphics) Object oriented programming

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Use of computer graphic simulation to explain color histogram structure

Use of computer graphic simulation to explain color histogra...

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Final program and Proceedings of the 5th IS and T/SID Color Imaging Conference: Color Science, Systems and Applications

作者： Peng, Liang Lafortune, Eric P.F. Greenberg, Donald P. Sobel, Irwin Cornell University Program of Computer Graphics Ithaca NY United States Printing Technology Department Hewlett Packard Laboratories Palo Alto CA United States

In this paper, we discuss the use of computer graphics techniques to model and explain the structures commonly observed in color histograms of images. This includes an accurate simulation of the physical reflection and transport behavior of light energy within 3D environments, the precise modeling of an image capturing system, and an interactive visualization module to display color histograms. Based on the fundamental rendering equation that describes light reflection and transport in the 3D world, we classify the color histogram structures of color images, and relate them to various physical components in image formation, including scene illumination, material reflectance properties, and the surface geometry of objects. We further show how these histogram structures can be effected by the artifacts caused by the limitation of image capturing systems. Our results demonstrate that the use of accurate simulation procedures under a precisely controlled computer graphic environment can clearly illustrate the causes of the structures observed, and can provide unique insights and explanations of image formation.

关键词： Color

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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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A practitioners' assessment of light reflection models

A practitioners' assessment of light reflection models

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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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Fast, Minimum Storage Ray-Triangle Intersection

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Journal of graphics Tools 1997年第1期2卷 21-28页

作者： Tomas M?ller[a] Ben Trumbore[b] [a]Prosolvia Clarus AB Chalmers University of Technology Gardaviigen S-41250 Gothenberg Sweden E-mail: [b]Program of Computer Graphics Cornell University Ithaca NY 14853 E-mail:

We present a clean algorithm for determining whether a ray intersects a triangle. The algorithm translates the origin of the ray and then changes the base to yield a vector (t u v)T, wheretis the distance to the plane in which the triangle lies and (u,v) represents the coordinates inside the *** advantage of this method is that the plane equation need not be computed on the fly nor be stored, which can amount to significant memory savings for triangle meshes. As we found our method to be comparable in speed to previous methods, we believe it is the fastest ray-triangle intersection routine for triangles that do not have precomputed plane equations.

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Computation of higher order illumination with a non-deterministic approach

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computer graphics FORUM 1996年第3期15卷 C327-&页

作者： Bouatouch, K Pattanaik, SN Zeghers, E IRISA Campus de Beaulieu 35042 Rennes Cedex France Program of computer graphics Cornell university

In spite of the number of efforts made by the computer graphics researchers, till today the computation of view-independent global illumination in an environment containing non-diffusely reflecting objects is a non-resolved problem. In general non-deterministic techniques seem to be capable of solving this problem. In this article we propose one such non-deterministic method which will permit such calculation by using a combined technique of higher order function approximation and particle tracing. We have used multi-wavelets as basis functions and have calculated the illumination function approximation coefficients;by exploiting the adjointness between the radiance equation and the potential equation.

关键词： radiance equation potential equation adjointness Monte Carlo quadrature random walk particle tracing weighted function approximation multiwavelet push/pull operation

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The symbiotic relationship between computer graphics and colour imaging

The symbiotic relationship between computer graphics and col...

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Final program and Proceedings of the 4th IS and T/SID Color Imaging Conference: Color Science, Systems and Applications

作者： Greenberg, Donald P. Program of Computer Graphics Cornell University Ithaca NY United States

Our goal is to develop physically based lighting models and perceptually based rendering procedures for computer graphics that will allow synthetic images to be generated that are visually and measurably indistinct from real-world images. The research implies the symbiotic relationship which could exist between computer graphics and digital imaging. This presentation describes how work at cornell's program of computer graphics is attempting to achieve this goal.

关键词： Color image processing

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