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ACM SIGGRAPH 2005 International Conference on computer graphics and Interactive Techniques, SIGGRAPH 2005

作者： Möller, Tomas Trumbore, Ben Prosolvia Claxus AB Chalmers University of Technology Sweden Program of Computer Graphics Cornell University United States

ISBN: (纸本)9781450378338

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 of that vector which yields a vector (t u v)T, where t is the distance to the plane in which the triangle lies and (u, v) represents the coordinates inside the triangle. One 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 which do not have precomputed plane equations.

关键词： Ray tracing

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A Hybrid Monte Carlo Method for Accurate and Efficient Subsurface Scattering

A Hybrid Monte Carlo Method for Accurate and Efficient Subsu...

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16th Eurographics Symposium on Rendering Techniques, EGSR 2005

作者： Li, Hongsong Pellacini, Fabio Torrance, Kenneth Program of Computer Graphics Rhodes Hall Cornell University IthacaNY14853 United States

ISBN: (纸本)3905673231

Subsurface scattering is a fundamental aspect of surface appearance responsible for the characteristic look of many materials. Monte Carlo path tracing techniques can be employed with high accuracy to simulate the scattering of light inside a translucent object, albeit at the cost of long computation times. In a seminal work, Jensen et al. [JMLH01] presented a more efficient technique to simulate subsurface scattering that, while producing accurate results for translucent, optically-thick, materials, exhibits artifacts for semi-transparent, optically-thin, ones, especially in regions of high-curvature. This paper presents a hybrid Monte Carlo technique capable of simulating a wide range of materials exhibiting subsurface scattering, from translucent to semi-transparent ones, with an accuracy comparable to Monte Carlo techniques but at a much lower computational cost. Our approach utilizes a Monte Carlo path tracing approach for the first several scattering events, in order to estimate the directional-diffuse component of subsurface scattering, and switches to a dipole diffusion approximation only when the path penetrates deeply enough into the surface. By combining the accuracy of Monte Carlo integration with the efficiency of the dipole diffusion approximation, our hybrid method produces results as accurate as full Monte Carlo simulations at a speed comparable to the Jensen et al. approximation, thus extending its usefulness to a much wider range of materials. © The Eurographics Association 2005.

关键词： Monte Carlo methods

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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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computer graphics for acoustic simulation and visualization

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The Journal of the Acoustical Society of America 2005年第S1期85卷 S77-S77页

作者： Adam Stettner Program of Computer Graphics Cornell University Ithaca NY 14853

computer simulation can be used to generate the spatial and temporal data describing acoustical behavior. By using computer graphics to display the multidimensional data, substantially greater amounts of information than conveyed by standard techniques can be communicated to the designer. A methodology is presented for evaluating an acoustical environment using a two phase approach. The first phase entails simulating the time varying spatial distribution of sound energy, using techniques similar to those used in computer graphics to model illumination. These techniques, specifically probabilistic geometric ray tracing and reflection modeling, have been highly refined. By modifying these methods to account for a few basic differences between light and sound, they can be well suited to the simulation of sound propagation. The second phase entails an investigation of techniques of displaying multidimensional data that are useful to the user. These techniques, which include the use of three‐dimensional color image generation, animation, and icon representation, are used to visualize acoustical measurements derived from the simulation data. Using these criteria, three variations in the design of a performance hall are evaluated and compared. [Work supported by NSF.]

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Effects of rendering on shape perception in automobile design 04

Effects of rendering on shape perception in automobile desig...

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Proceedings - 1st Symposium on Applied Perception in graphics and Visualization, APGV 2004

作者： Ferwerda, James A. Westin, Stephen H. Smith, Randall C. Pawlicki, Richard Program of Computer Graphics Cornell University United States General Motors R and D

ISBN: (纸本)1581139144

The goal of this project was to determine if advanced rendering methods such as global illumination allow more accurate discrimination of shape differences than standard rendering methods such as OpenGL. To address these questions, we conducted two psychophysical experiments to measure observers' sensitivity to shape differences between a physical model and rendered images of the model. Two results stand out: The rendering method used has a significant effect on the ability to discriminate shape. In particular, under the conditions tested, global illumination rendering improves sensitivity to shape differences. Further, viewpoint appears to have an effect on the ability to discriminate shape. In most of the cases studied, sensitivity to small shape variations was poorer when the rendering and model viewpoints were different. The results of this work have important implications for our understanding of human shape perception and for the development of rendering tools for computer-aided design.

关键词： Sensory perception

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Perceptual illumination components: A new approach to efficient, high quality global illumination rendering 04

Perceptual illumination components: A new approach to effici...

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ACM SIGGRAPH 2004

作者： Stokes, William A. Ferwerda, James A. Walter, Bruce Greenberg, Donald P. Program of Computer Graphics Cornell University 580 Rhodes Hall Ithaca NY 14853

ISBN: (纸本)9781450378239

In this paper we introduce a new perceptual metric for efficient, high quality, global illumination rendering. The metric is based on a rendering-by-components framework in which the direct, and indirect diffuse, glossy, and specular light transport paths are separately computed and then composited to produce an image. The metric predicts the perceptual importances of the computationally expensive indirect illumination components with respect to image quality. To develop the metric we conducted a series of psychophysical experiments in which we measured and modeled the perceptual importances of the components. An important property of this new metric is that it predicts component importances from inexpensive estimates of the reflectance properties of a scene, and therefore adds negligible overhead to the rendering process. This perceptual metric should enable the development of an important new class of efficient global-illumination rendering systems that can intelligently allocate limited computational resources, to provide high quality images at interactive rates. © 2004 ACM.

关键词： Image analysis

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3D scattered data approximation with adaptive compactly supported radial basis functions

3D scattered data approximation with adaptive compactly supp...

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6th International Conference on Shape Modeling and Applications

作者： Ohtake, Y Belyaev, A Seidel, HP Computer Graphics Group Max-Planck-Inst. für Informatik Germany Intgd. V-CAD System Research Program RIKEN Japan

ISBN: (纸本)0769520758

In this paper we develop an adaptive RBF fitting procedure for a high quality approximation of a set of points scattered over a piecewise smooth surface. We use compactly supported RBFs whose centers are randomly chosen from the points. The randomness is controlled by the point density and surface geometry. For each RBF its support size is chosen adaptively according to surface geometry at a vicinity of the RBF center All these lead to a noise-robust high quality approximation of the set. We also adapt our basic technique for shape reconstruction from registered range scans by taking into account measurement confidences. Finally, an interesting link between our RBF fitting procedure and partition of unity approximations is established and discussed.

关键词： adaptive RBF surface reconstruction from scattered data

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Feature-Based Textures

Feature-Based Textures

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15th Eurographics Workshop on Rendering Techniques, EGSR 2004

作者： Ramanarayanan, G. Bala, K. Walter, B. Department of Computer Science Cornell University IthacaNY United States Program of Computer Graphics Cornell University IthacaNY United States

ISBN: (纸本)3905673126

This paper introduces feature-based textures, a new image representation that combines features and samples for high-quality texture mapping. Features identify boundaries within an image where samples change discontinuously. They can be extracted from vector graphics representations, or explicitly added to raster images to improve sharpness. Texture lookups are then interpolated from samples while respecting these boundaries. We present results from a software implementation of this technique demonstrating quality, efficiency and low memory overhead. © The Eurographics Association 2004.

关键词： Image enhancement

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3D scattered data approximation with adaptive compactly supported radial basis functions

3D scattered data approximation with adaptive compactly supp...

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International Conference on Shape Modeling and Applications

作者： Y. Ohtake A. Belyaev H.-P. Seidel Integrated V-CAD System Research Program RIKEN Japan Computer Graphics Group Max Planck Institut für Informatik Germany

We develop an adaptive RBF fitting procedure for a high quality approximation of a set of points scattered over a piecewise smooth surface. We use compactly supported RBFs whose centers are randomly chosen from the points. The randomness is controlled by the point density and surface geometry. For each RBF, its support size is chosen adoptively according to surface geometry at a vicinity of the RBF center. All these lead to a noise-robust high quality approximation of the set. We also adapt our basic technique for shape reconstruction from registered range scans by taking into account measurement confidences. Finally, an interesting link between our RBF fitting procedure and partition of unity approximations is established and discussed.

关键词： Scattering Surface fitting Chromium Noise shaping Surface reconstruction Geometry Shape measurement Gold computer graphics Electronic mail

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Performance evaluation metrics for motion detection and tracking

Performance evaluation metrics for motion detection and trac...

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International Conference on Pattern Recognition

作者： T. Schlogl C. Beleznai M. Winter H. Bischof Advanced Computer Vision GmbH-ACV Vienna Austria Program and System Engineering Siemens AG Österreich Graz Austria Institute of Computer Graphics and Vision University of Technology Graz Austria

This work introduces a methodology for evaluating the operational range of a video surveillance system in terms of robustness and reliability. We propose the generation of semi and full-synthetic video sequences under controlled variation of selected parameters. This data provides the necessary ground truth information for evaluating the motion detection and tracking systems. In addition, we propose several error metrics for quantitative evaluation.

关键词： Motion detection computer vision Video sequences Video surveillance computer errors Target tracking Motion segmentation Reliability engineering Systems engineering and theory computer graphics

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