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共 342 条记录，以下是271-280 订阅

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The magic volume lens: An interactive focus+context technique for volume rendering

The magic volume lens: An interactive focus+context techniqu...

引用

VIS 05: IEEE visualization 2005, Proceedings

作者： Wang, Lujin Zhao, Ye Mueller, Klaus Kaufman, Arie Center for Visual Computing Computer Science Stony Brook University

ISBN: (纸本)0780394623

The size and resolution of volume datasets in science and medicine are increasing at a rate much greater than the resolution of the screens used to view them. This limits the amount of data that can be viewed simultaneously, potentially leading to a loss of overall context of the data when the user views or zooms into a particular area of interest. We propose a focus+context framework that uses various standard and advanced magnification lens rendering techniques to magnify the features of interest, while compressing the remaining volume regions without clipping them away completely. Some of these lenses can be interactively configured by the user to specify the desired magnification patterns, while others are feature-adaptive. All our lenses are accelerated on the GPU. They allow the user to interactively manage the available screen area, dedicating more area to the more resolution-important features. © 2005 IEEE.

关键词： Lenses

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Spline-based gradient filters for high-quality refraction computations in discrete datasets

Spline-based gradient filters for high-quality refraction co...

引用

7th Joint Eurographics - IEEE VGTC Symposium on visualization, VisSym 2005

作者： Li, Shengying Mueller, Klaus Department of Computer Science Center for Visual Computing Stony Brook University

ISBN: (纸本)3905673193

Based on the finding that refraction imposes significantly higher demands onto gradient filters than illumination and shading, we evaluate the family of spline filters as a good alternative to the cubic filters, which so far have served as the gold standard of efficient yet high-quality interpolation filters in present visualization applications. Using a regular background texture to visualize the refractive properties of the volumetric object, we also describe an efficient scheme to achieve the effects of supersampling without incurring any extra raycasting overhead. Our results indicate that splines can be superior to the Catmull-Rom filter, with potentially less computational overhead, also offering a convenient means to adjust the extent of lowpassing and smoothing. © The Eurographics Association 2005.

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visual simulation of chemical gardens

Visual simulation of chemical gardens

引用

computer Graphics International Conference (CGI 2005)

作者： Wei, XM Qiu, F Li, W Yoakum-Stover, S Kaufman, A Computer Science Department Iona College United States Center for Visual Computing Department of Computer Science Stony Brook University United States Siemens Corporate Research United States

ISBN: (纸本)0780393309

We present a visualization and modeling system for the creation of chemical gardens. A chemical garden is a collection of plant-like structures formed when placing a soluble metal salt in an aqueous solution of sodium silicate. An accurate simulation of the chemical reaction of the metal salt and the physical behavior of the surrounding sodium silicate solution flow are complicated and time-consuming. Instead, in our system we use and propose a simplified 3D cellular automata (CA) approach to model the growing process of a chemical garden and its interaction with the solution flow. The input of our system is the shape and types of various soluble metal salts. Our program supports the visualization of the growth and formation of the chemical garden. The interactive rendering result on a texture mapping hardware also helps the user in observing and creating a desirable chemical garden.

关键词： cellular automata natural phenomena Modeling growing rules volume rendering

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Surface reconstruction using oriented charges

Surface reconstruction using oriented charges

引用

computer Graphics International 2005, CGI 2005

作者： Wang, Jianning Oliveira, Manuel M. Xie, Hui Kaufman, Arie E. Center of Visual Computing Computer Science Stony Brook University United States Instituto de Informática UFRGS Brazil

ISBN: (纸本)0780393309

We introduce the notion of oriented charges to compute distance fields from unorganized point clouds. Unlike traditional implicit function methods that usually require normal information, our approach only uses information about the position of the samples. Our approach is adaptive, using an octree to reorganize the input points, thus avoiding difficulties often associated with the use of local distance fields. The resulting representation is simple, efficient and general in the sense that it handles complex models of arbitrary topology, is robust in the presence of noise and fills holes automatically. © 2005 IEEE.

关键词： Image reconstruction

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GPU accelerated image aligned splatting 05

GPU accelerated image aligned splatting

引用

International Workshop on Volume Graphics, VG

作者： N. Neophytou K. Mueller Center for Visual Computing Computer Science Stony Brook University USA

ISBN: (纸本)9783905673265

Splatting is a popular technique for volume rendering, where voxels are represented by Gaussian kernels, whose pre-integrated footprints are accumulated to form the image. Splatting has been mainly used to render pre-shaded volumes, which can result in significant blurring in zoomed views. This can be avoided in the image-aligned splatting scheme, where one accumulates kernel slices into equi-distant, parallel sheet buffers, followed by classification, shading, and compositing. In this work, we attempt to evolve this algorithm to the next level: GPU (graphics processing unit) based acceleration. First we describe the challenges that the highly parallel "Gather" architecture of modern GPUs poses to the "Scatter" based nature of a splatting algorithm. We then describe a number of strategies that exploit newly introduced features of the latest-generation hardware to address these limitations. Two crucial operations to boost the performance in image-aligned splatting are the early elimination of hidden splats and the skipping of empty buffer-space. We describe mechanisms which take advantage of the early z-culling hardware facilities to accomplish both of these operations efficiently in hardware.

关键词： Acceleration Hardware Rendering (computer graphics) Kernel computer graphics Casting computer architecture visualization Pixel computer science

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The magic volume lens: an interactive focus+context technique for volume rendering

The magic volume lens: an interactive focus+context techniqu...

引用

IEEE Conference on visualization

作者： L. Wang Y. Zhao K. Mueller A. Kaufman Center for Visual Computing Computer Science Stony Brook University USA

关键词： Lenses Focusing computer graphics Humans Image generation computer displays Large screen displays Rendering (computer graphics) Retina Navigation

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Accelerated, high-quality refraction computations for volume graphics 05

Accelerated, high-quality refraction computations for volume...

引用

International Workshop on Volume Graphics, VG

作者： Shengying Li K. Mueller Department of Computer Science Center for Visual Computing Stony Brook University USA

ISBN: (纸本)3905673266

We present an efficient framework for the high-quality rendering of discretely sampled surface-based objects with refractive effects. This requires an accurate estimation of the refraction coefficients, paired with efficient and accurate surface detection, space traversal, and backdrop image sampling. Our framework achieves these goals, by employing a high-quality spline-based filter in conjunction with a novel filtered octree space decomposition with pre-classified cells that is carefully matched to the filter and voxel neighborhood characteristics. Here, we benefit greatly from the non-negativity of the B-spline kernel. Finally, we describe an innovative scheme that achieves the high quality of pixel super-sampling on a flat backdrop plane without the overhead of tracing the actual rays across the refractive object.

关键词： Acceleration computer graphics Rendering (computer graphics) Spline Matched filters Interpolation computer science Image sampling Kernel Carbon capture and storage

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Front spreading on 3D surfaces

Front spreading on 3D surfaces

引用

computer Graphics International

作者： Y. Zhao A. Kaufman Center for Visual Computing and Department of Computer Science Stony Brook University Stony Brook NY USA

We present a method for simulating front propagation over 3D surfaces with arbitrary topology. Our approach, which can handle the simultaneous spreading of multiple fronts, is implemented by applying a level set method on the surface. A special data structure, called the surrounding grid, assists in advancing the fronts without triangulation or parameterization of the surface. The surrounding grid consists of discretized grid points in the vicinity of the surface. An enhanced distance field provides the bridge between the surrounding grid and the surfaces on which the fronts travel. By manipulating speed functions in the level set method, the front propagation dynamics can be conveniently controlled. We illustrate the applicability and flexibility of our method with three example applications: texture generation, water flooding, and fire propagation.

关键词： Fires Level set Computational modeling Floods computer graphics Topology Bridges Geometry Merging computer science

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Distributed volume rendering on a visualization cluster

Distributed volume rendering on a visualization cluster

引用

IEEE International Conference on computer-Aided Design and computer Graphics

作者： S. Frank A. Kaufman Center For Visual Computing and Department of Computer Science Stony Brook University Stony Brook NY USA

We describe the rendering of massive volumes on a volume visualization cluster. We present our data distribution scheme and introduce an algorithm which reduces the memory requirement with no loss of accuracy. The volume is automatically cropped and partitioned into small volume blocks. The bounding boxes of these volume blocks are used at run-time for flexible partitioning of the volume across the network. We present results of rendering the full visible male color dataset, seismic data, and several large micro-CT scanned fossil and teeth datasets.

关键词： Clustering algorithms Slabs Data visualization Rendering (computer graphics) Costs Memory management computer science Partitioning algorithms Runtime Teeth

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Rational spherical splines for genus zero shape modeling

Rational spherical splines for genus zero shape modeling

引用

International Conference on Shape Modeling and Applications

作者： Y. He X. Gu H. Qin Center for Visual Computing (CVC) and Department of Computer Science Stony Brook University Stony Brook NY USA

Traditional approaches for modeling a closed manifold surface with either regular tensor-product or triangular splines (defined over an open planar domain) require decomposing the acquired geometric data into a group of charts, mapping each chart to a planar parametric domain, fitting an open surface patch of certain degree to each chart, and finally, trimming the patches (if necessary) and stitching all of them together to form a closed manifold. In this paper, we develop a novel modeling method which does not need any cutting or patching operations for genus zero surfaces. Our new approach is founded upon the concept of spherical splines proposed by Pfeifle and Seidel. Our work is strongly inspired by the fact that, for genus zero surfaces, it is both intuitive and necessary to employ spheres as their natural domains. Using this framework, we can convert genus zero mesh to a single rational spherical spline whose maximal error deviated from the original data is less than a user-specified tolerance. With the rational spherical splines, we can model sharp features and edit both the global shape and the local details with ease. Furthermore, we can accurately compute the differential quantities without resorting to any numerical approximations. We conduct several experiments in order to demonstrate the efficacy of our approach for reverse engineering, shape modeling, and interactive graphics.

关键词： Surface fitting Spline Size control Shape control Solid modeling Surface topography Surface reconstruction Helium computer science Reverse engineering

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