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Design Automation Conference

作者： M. Schiler D.P. Greenberg Program of computer Graphics Cornell University Ithaca NY USA

The calculation of building thermal loads using the computer has been an accepted practice for several years. A substantial amount of research and theoretical investigation has been expended in attempts to accurately quantify a building's thermal behavior. A number of existing simulation packages acceptably model this behavior.1,2,3,4,5,6The advantages of simulation are obvious, not only for the predictive information with respect to operating costs or fuel consumption, but as a potential aid for preliminary design. The influence and tradeoffs of a large number of design variables such as siting, orientation, window area, thermal resistivity, surface/volume ratios, and cost can all be examined at an early stage in the design process.

关键词： computer simulation computer graphics Information analysis Computational modeling Packaging Costs Analytical models Tree graphs Thermal loading Predictive models

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An interactive graphics environment for architectural energy simulation 82

An interactive graphics environment for architectural energy...

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

作者： Jon H. Pittman Donald P. Greenberg Program of Computer Graphics Cornell University Ithaca New York

ISBN: (纸本)9780897910767

An interactive computer graphics system has been developed for the architecture profession which provides a “design environment” for the evaluation of building energy consumption. The system includes an integrated set of graphic input tools which generate the geometric and attribute data necessary for the determination of thermal load in buildings. In addition, a comprehensive set of graphical output routines has been created to allow the designer to visually interpret the results of alternative design strategies.

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Path specification and path coherence 82

Path specification and path coherence

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

作者： Kim L. Shelley Donald P. Greenberg Program of Computer Graphics Cornell University Ithaca New York

ISBN: (纸本)9780897910767

This paper presents an interactive method for specifying a path in space and time through a three-dimensional environment. A sequence is generated by showing the series of views along the path. The sequence is previewed on a vector scope, and after it is interactively refined, each frame is rendered on a raster device. The path is represented by a B-spline to provide smooth, continuous motion. The timing along the path is also defined by a B-spline so that changes in velocity are smooth. The use of “path coherence” is introduced. The utilization of the available data from the a priori temporal and spatial path definition holds great promise for frame to frame coherence. The path coherence can be used to reduce the number of polygons which need to be considered in a viewed environment. This reduction makes the previewing of complex environments appear less cluttered. Furthermore, the computational expense of the culling and sorting operations in the visible line/surface determination is reduced. One sample usage of this is a tree-structured partitioned environment where the priority ordering of the environment must be changed only when the path crosses a partition boundary.

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Three-dimensional reconstruction and volume rendering of intravascular ultrasound slices imaged on a curved arterial path 1st

Three-dimensional reconstruction and volume rendering of int...

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1st International Conference on computer Vision, Virtual Reality, and Robotics in Medicine, CVRMed 1995

作者： Lengyel, Jed Greenberg, Donald P. Yeung, Alan Alderman, Edwin Popp, Richard Program of Computer Graphics Cornell University IthacaNY14853 United States Cardiovascular Medicine Division Stanford University School of Medicine StanfordCA94305 United States

ISBN: (纸本)9783540591207

Past techniques for three-dimensional reconstruction of intravascular ultrasound have assumed that the ultrasound slices are parallel and that the vessel being imaged is straight. These assumptions result in distortions of vessel and lesion geometry. To properly reconstruct the volume data for a curved artery, the position and orientation of the transducer must be known or calculated. We use angiography to recover the geometry of the artery centerline, which is then used as a coordinate system to position the ultrasound slices. To estimate the registration of the slices, several landmark sites are selected by the physician and imaged over a complete heart cycle. Continuous pullbacks are then used to sample between the landmark sites, yielding a three-dimensional volume data set. Standard volume rendering techniques require data on a regular grid. We present new sampling and rendering techniques that handle the oriented ultrasound slices positioned along the curved artery. © Springer-Verlag Berlin Heidelberg 1995.

关键词： Ultrasonics

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Using perceptual texture masking for efficient image synthesis

Using perceptual texture masking for efficient image synthes...

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23rd Annual Conference (EUROgraphics 2002)

作者： Walter, Bruce Pattanaik, Sumanta N. Greenberg, Donald P. Program of Computer Graphics 580 Rhodes Hall Cornell University Ithaca NY 14853 United States University of Central Florida SEECS Department of Computer Science Orlando FL 32816-2362 United States

Texture mapping has become indispensable in image synthesis as an inexpensive source of rich visual detail. Less obvious, but just as useful, is its ability to mask image errors due to inaccuracies in geometry or lighting. This ability can be used to substantially accelerate rendering by eliminating computations when the resulting errors will be perceptually insignificant. Our new method precomputes the masking ability of textures using aspects of the JPEG image compression standard. This extra information is stored as threshold elevation factors in the texture's mip-map and interpolated at image generation time as part of the normal texture lookup process. Any algorithm which uses error tolerances or visibility thresholds can then take advantage of texture masking. Applications to adaptive shadow testing, irradiance caching, and path tracing are demonstrated. Unlike prior methods, our approach does not require that initial images be computed before masking can be exploited and incurs only negligible runtime computational overhead. Thus, it is much easier to integrate with existing rendering systems for both static and dynamic scenes and yields computational savings even when only small amounts of texture masking are present.

关键词： Image compression

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Edit propagation via edge-aware filtering

Edit propagation via edge-aware filtering

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作者： Hu, Wei Dong, Zhao Yuan, Guo-Dong Department of Computer Science and Technology Beijing University of Chemical Technology Beijing 100028 China Program of Computer Graphics Cornell University Ithaca 14853 United States Department of Computer Science and Technology Tsinghua University Beijing 100084 China

This paper presents a novel framework for efficiently propagating the stroke-based user edits to the regions with similar colors and locations in high resolution images and videos. Our framework is based on the key observation that the edit propagation intrinsically can also be achieved by utilizing recently proposed edge-preserving filters. Therefore, instead of adopting the traditional global optimization which may involve a time-consuming solution, our algorithm propagates edits with the aid of the edge-preserve filters. Such a propagation scheme has low computational complexity and supports multiple kinds of strokes for more flexible user interactions. Further, our method can be easily and efficiently implemented in GPU. The experimental results demonstrate the efficiency and user-friendliness of our approach. © 2012 Springer Science+Business Media, LLC & Science Press. China.

关键词： Global optimization

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Visual equivalence: An object-based approach to image quality

Visual equivalence: An object-based approach to image qualit...

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16th Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications

作者： Ferwerda, James A. Ramanarayanan, Ganesh Walter, Bruce Bala, Kavita Munsell Color Science Laboratory Center for Imaging Science Rochester Institute of Technology Rochester NY United States Department of Computer Science Cornell University Ithaca NY United States Program of Computer Graphics Cornell University Ithaca NY United States

ISBN: (纸本)9780892082810

In this paper we introduce a new approach to characterizing image quality: visual equivalence, Images are visually equivalent if they convey the same information about object appearance even if they are visibly different. In a series of psychophysical experiments we explore how object geometry, material, and illumination interact to produce images that are visually equivalent, and we identify how two kinds of transformations on illumination fields (blurring and warping) influence observers' judgments of equivalence. We use the results of the experiments to derive metrics that can serve as visual equivalence predictors (VEPs) and we generalize these metrics so they can be applied to novel objects and scenes. Finally we validate the predictors in a confirmatory study, and show that they reliably predict observer's judgments of equivalence. Visual equivalence is a significant new approach to measuring image quality that goes beyond existing visible difference metrics by leveraging the fact that some kinds of image differences do not matter to human observers. By taking advantage of higher order aspects of visual object coding, visual equivalence metrics should enable the development of powerful new classes of image capture, compression, rendering, and display algorithms.

关键词： Image quality

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VR - A reality check?

VR - A reality check?

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IEEE Virtual Reality 2005

作者： Smith, Randall C. Sandin, Dan Fisher, Brian D. Westin, Stephen H. General Motors R and D Electronic Visualization Lab. U. Illinois Chicago School of Interactive Arts and Technology Simon Fraser University Program of Computer Graphics Cornell University

Within the large spectrum of possible VR application areas, automotive applications were among the first to appear, and are among the most demanding. Technology has not been sufficiently sophisticated for many tasks. The troubling thought is that we are happy to push the technology envelope, but don't really know how useful this technology is, or can be. Could I do my job even if I had a real-time, ortho-stereoscopic, head-tracked, multi-viewer, wide-field-of-view, high-dynamic-range display with eye-limiting acuity?

关键词： Virtual reality

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A fast and accurate light reflection model 92

A fast and accurate light reflection model

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

作者： Xiao D. He Patrick O. Heynen Richard L. Phillips Kenneth E. Torrance David H. Salesin Donald P. Greenberg Program of Computer Graphics Cornell University Ithaca New York Program of Computer Graphics Cornell University Ithaca New York Los Alamos National Laboratory Los Alamos New Mexico

No abstract available.

ISBN: (纸本)9780897914796

No abstract available.

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A NUMERICAL PROCEDURE FOR SIMULATION OF HYDRAULICALLY-DRIVEN FRACTURE PROPAGATION IN POROELASTIC MEDIA

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INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS 1990年第1期14卷 27-+页

作者： BOONE, TJ INGRAFFEA, AR Program of Computer Graphics and School of Civil and Environmental Engineering Cornell University Ithaca NY 14853-3501 U.S.A.

A procedure for numerical approximation to two-dimensional, hydraulically-driven fracture propagation in a poroelastic material is described. The method uses a partitioned solution procedurè to solve a finite element approximation to problems described by the theory of poroelasticity, in conjunction with a finite difference approximation for modelling fluid flow along the fracture. An equilibrium fracture model based on a generalized, Dugdale–Barenblatt concept is used to determine the fracture dimensions. An important feature is that the fracture length is a natural product of the solution algorithm. Two example problems verify the accuracy of the numerical procedure and a third example illustrates a fully-coupled simulation of fracture propagation. Photographs taken from a high-performance engineering workstation provide insight into the nature of the coupling among the physical phenomena.

关键词： Porous Materials

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