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Jiawen Chen
A number of useful image and video processing techniques, ranging from low level operations such as denoising and detail enhancement to higher level methods such as object manipulation and special effects, rely on piecewise-smooth functions computed from the input data. In this thesis, we present two computationally efficient data structures for representing piecewise-smooth visual information […]
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Yi Sun, Shuling Dai, Cheng Ren, Na Chen
In a multi-projector display system, geometric calibration is usually time-consuming and tedious. In this paper, we propose a multi-projector tiled display method with geometry parameters estimation. The method is used for analytic curved surface, such as cylindrical or spherical shaped display. The calibration process is automatic by using computer vision techniques; and in order to […]
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Simon Stegmaier, Magnus Strengert, Thomas Klein, Thomas Ertl
In this work we present a flexible framework for GPU-based volume rendering. The framework is based on a single pass volume raycasting approach and is easily extensible in terms of new shader functionality. We demonstrate the flexibility of our system by means of a number of high-quality standard and nonstandard volume rendering techniques. Our implementation […]
Ofri Sadowsky, Jonathan D. Cohen, Russell H. Taylor
This paper presents a novel method for volume rendering of unstructured grids. Previously, we introduced an algorithm for perspective-correct interpolation of barycentric coordinates and computing polynomial attenuation integrals for a projected tetrahedron using graphics hardware. In this paper, we enhance the algorithm by providing a simple and efficient method to compute the projected shape (silhouette) […]
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Ralf P. Botchen, Daniel Weiskopf, Thomas Ertl
In this paper, we present two novel texture-based techniques to visualize uncertainty in time-dependent 2D flow fields. Both methods use semi-Lagrangian texture advection to show flow direction by streaklines and convey uncertainty by blurring these streaklines. The first approach applies a cross advection perpendicular to the flow direction. The second method employs isotropic diffusion that […]
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Manfred Weiler, Ralf P. Botchen, Jingshu Huang, Yun Jang, Simon Stegmaier, Kelly P. Gaither, David S. Ebert, Thomas Ertl
We take a new approach to interactive visualization and feature detection of large scalar, vector, and multifield computational fluid dynamics data sets that is also well suited for meshless CFD methods. Radial basis functions (RBFs) are used to procedurally encode both scattered and irregular gridded scalar data sets. The RBF encoding creates a complete, unified, […]
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Urmas Rosenberg
Development of Central Processing Unit (CPU) is approaching its physical limits, struggling at the same time with problems like high temperature and increasing need of extra power. There are mainly two alternatives to relieve those problems – Grid computing and Multi Core processors. Both of those approaches are able to give us more computing power […]
John Hable, Jarek Rossignac
To eliminate the need to evaluate the intersection curves in explicit representations of surface cutouts or of trimmed faces in BReps of CSG solids, we advocate using constructive solid trimming (CST). A CST face is the intersection of a surface with a Blist representation of a trimming CSG volume. We propose a new GPU-based CSG […]
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Jay L. T. Cornwall
This paper presents an evaluation of the state of the art in Graphics Processing Unit (GPU) algorithmic techniques. Fast, portable methods for maintaining state between independent passes of an algorithm are compared and contrasted with similar techniques from the previous generation, which are still in widespread use in the graphical and non-graphical fields today. The […]
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Roman Durikovic, Ryou Kimura
Spectrum-based rendering uses spectral distributions instead of just three RGB colors for representation of light sources and surface properties in rendering equation. Since, spectrum has a value at every visible wavelength, the spectrum-based rendering gives much accurate color computation compared to RGB-based rendering and it give us opportunity to simulate wavelength dependent phenomena and effects […]
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Specifications GPU NV40 Stream Processing Units 6 Core Clock 350 MHz Memory Clock 1000 MHz Effective Memory Clock 2000 MHz Memory Type GDDR3 Amount of memory 256, (512 PCI-e only) MB Memory Bandwidth 32 GB/sec Buswidth 256 bit Tech process 130 nm Interface PCIe x16/AGP 8X PS/VS version 3.0/3.0 DirectX compliance 9.0c Retail Cards Based […]
Feng Cao, Anthony Tung, Aoying Zhou
We present new algorithms for scalable clustering using graphics processors. Our basic approach is based on k-means. By changing the order of determining object labels, and exploiting the high computational power and pipeline of graphics processing units (GPUs) for distance computing and comparison, we speed up the k-means algorithm substantially. We introduce two strategies for […]
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