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Displaying 1-38 out of 38 total
Parallel lumigraph reconstruction
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By Charles Hansen, Peter-Pike Sloan
Issue Date:October 1999
pp. 7-14
This paper presents three techniques for reconstructing Lumigraphs/Lightfields on commercial ccNUMA parallel distributed shared memory computers. The first method is a parallel extension of the software-based method proposed in the Lightfield paper. This e...
 
An interactive visualization tool for multi-channel confocal microscopy data in neurobiology research
Found in: IEEE Transactions on Visualization and Computer Graphics
By Yong Wan, Hideo Otsuna, Chi-Bin Chien, Charles Hansen
Issue Date:November 2009
pp. 1489-1496
Confocal microscopy is widely used in neurobiology for studying the three-dimensional structure of the nervous system. Confocal image data are often multi-channel, with each channel resulting from a different fluorescent dye or fluorescent protein; one cha...
 
Volume Ray Casting with Peak Finding and Differential Sampling
Found in: IEEE Transactions on Visualization and Computer Graphics
By Aaron Knoll, Younis Hijazi, Rolf Westerteiger, Mathias Schott, Charles Hansen, Hans Hagen
Issue Date:November 2009
pp. 1571-1578
Direct volume rendering and isosurfacing are ubiquitous rendering techniques in scientific visualization, commonly employed in imaging 3D data from simulation and scan sources. Conventionally, these methods have been treated as separate modalities, necessi...
 
Interactive Ray Tracing of Arbitrary Implicits with SIMD Interval Arithmetic
Found in: Symposium on Interactive Ray Tracing
By Aaron Knoll, Younis Hijazi, Charles Hansen, Ingo Wald, Hans Hagen
Issue Date:September 2007
pp. 11-18
We present a practical and efficient algorithm for interactively ray tracing arbitrary implicit surfaces. We use interval arithmetic (IA) both for robust root computation and guaranteed detection of topological features. In conjunction with ray tracing, th...
 
Scout: A Hardware-Accelerated System for Quantitatively Driven Visualization and Analysis
Found in: Visualization Conference, IEEE
By Patrick S. McCormick, Jeff Inman, James P. Ahrens, Charles Hansen, Greg Roth
Issue Date:October 2004
pp. 171-178
Quantitative techniques for visualization are critical to the successful analysis of both acquired and simulated scientific data. Many visualization techniques rely on indirect mappings, such as transfer functions, to produce the final imagery. In many sit...
 
Guest Editors' Introduction: Graphics Applications for Grid Computing
Found in: IEEE Computer Graphics and Applications
By Charles Hansen, Chris Johnson
Issue Date:March 2003
pp. 20-21
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A Practical Workflow for Making Anatomical Atlases for Biological Research
Found in: IEEE Computer Graphics and Applications
By Yong Wan,A. Kelsey Lewis,Mary Colasanto,Mark van Langeveld,Gabrielle Kardon,Charles Hansen
Issue Date:September 2012
pp. 70-80
The anatomical atlas has been at the intersection of science and art for centuries. These atlases are essential to biological research, but high-quality atlases are often scarce. Recent advances in imaging technology have made high-quality 3D atlases possi...
 
FluoRender: An application of 2D image space methods for 3D and 4D confocal microscopy data visualization in neurobiology research
Found in: Visualization Symposium, IEEE Pacific
By Yong Wan,Hideo Otsuna,Chi-Bin Chien,Charles Hansen
Issue Date:March 2012
pp. 201-208
2D image space methods are processing methods applied after the volumetric data are projected and rendered into the 2D image space, such as 2D filtering, tone mapping and compositing. In the application domain of volume visualization, most 2D image space m...
 
Interactive Display of Isosurfaces with Global Illumination
Found in: IEEE Transactions on Visualization and Computer Graphics
By Chris Wyman, Steven Parker, Peter Shirley, Charles Hansen
Issue Date:March 2006
pp. 186-196
<p><b>Abstract</b>—In many applications, volumetric data sets are examined by displaying <it>isosurfaces</it>, surfaces where the data, or some function of the data, takes on a given value. Interactive applications typically u...
 
Statistically Quantitative Volume Visualization
Found in: Visualization Conference, IEEE
By Joe M. Kniss, Robert Van Uitert, Abraham Stephens, Guo-Shi Li, Tolga Tasdizen, Charles Hansen
Issue Date:October 2005
pp. 37
Visualization users are increasingly in need of techniques for assessing quantitative uncertainty and error in the images produced. Statistical segmentation algorithms compute these quantitative results, yet volume rendering tools typically produce only qu...
 
Reconstruction and Visualization of Planetary Nebulae
Found in: IEEE Transactions on Visualization and Computer Graphics
By Marcus Magnor, Gordon Kindlmann, Charles Hansen, Neb Duric
Issue Date:September 2005
pp. 485-496
From our terrestrially confined viewpoint, the actual three-dimensional shape of distant astronomical objects is, in general, very challenging to determine. For one class of astronomical objects, however, spatial structure can be recovered from conventiona...
 
Visualization of Intricate Flow Structures for Vortex Breakdown Analysis
Found in: Visualization Conference, IEEE
By Xavier Tricoche, Christoph Garth, Gordon Kindlmann, Eduard Deines, Gerik Scheuermann, Markus Ruetten, Charles Hansen
Issue Date:October 2004
pp. 187-194
Vortex breakdowns and flow recirculation are essential phenomena in aeronautics where they appear as a limiting factor in the design of modern aircrafts. Because of the inherent intricacy of these features, standard flow visualization techniques typically ...
 
Constrained Inverse Volume Rendering for Planetary Nebulae
Found in: Visualization Conference, IEEE
By Marcus Magnor, Gordon Kindlmann, Charles Hansen
Issue Date:October 2004
pp. 83-90
Determining the three-dimensional structure of distant astronomical objects is a challenging task, given that terrestrial observations provide only one viewpoint. For this task, bipolar planetary nebulae are interesting objects of study because of their pr...
 
Interactive Caustics Using Local Precomputed Irradiance
Found in: Computer Graphics and Applications, Pacific Conference on
By Chris Wyman, Charles Hansen, Peter Shirley
Issue Date:October 2004
pp. 143-151
Bright patterns of light focused via reflective or refractive objects onto matte surfaces are called
 
Visually Accurate Multi-Field Weather Visualization
Found in: Visualization Conference, IEEE
By Kirk Riley, David Ebert, Charles Hansen, Jason Levit
Issue Date:October 2003
pp. 37
Weather visualization is a difficult problem because it comprises volumetric multi-field data and traditional surface-based approaches obscure details of the complex three-dimensional structure of cloud dynamics. Therefore, visually accurate volumetric mul...
 
Gaussian Transfer Functions for Multi-Field Volume Visualization
Found in: Visualization Conference, IEEE
By Joe Kniss, Simon Premoze, Milan Ikits, Aaron Lefohn, Charles Hansen, Emil Praun
Issue Date:October 2003
pp. 65
Volume rendering is a flexible technique for visualizing dense 3D volumetric datasets. A central element of volume rendering is the conversion between data values and observable quantities such as color and opacity. This process is usually realized through...
 
Distributed Interactive Ray Tracing for Large Volume Visualization
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By David E DeMarle, Steven Parker, Mark Hartner, Christiaan Gribble, Charles Hansen
Issue Date:October 2003
pp. 12
We have constructed a distributed parallel ray tracing system that interactively produces isosurface renderings from large data sets on a cluster of commodity PCs. The program was derived from the SCI Institute's interactive ray tracer (*-Ray), which utili...
 
A Model for Volume Lighting and Modeling
Found in: IEEE Transactions on Visualization and Computer Graphics
By Joe Kniss, Simon Premoze, Charles Hansen, Peter Shirley, Allen McPherson
Issue Date:April 2003
pp. 150-162
<p><b>Abstract</b>—Direct volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volumetric da...
 
Illustrative Interactive Stipple Rendering
Found in: IEEE Transactions on Visualization and Computer Graphics
By Aidong Lu, Christopher J. Morris, Joe Taylor, David S. Ebert, Charles Hansen, Penny Rheingans, Mark Hartner
Issue Date:April 2003
pp. 127-138
<p><b>Abstract</b>—Simulating hand-drawn illustration can succinctly express information in a manner that is communicative and informative. We present a framework for an interactive direct stipple rendering of volume and surface-based obj...
 
Non-Photorealistic Volume Rendering Using Stippling Techniques
Found in: Visualization Conference, IEEE
By Aidong Lu, Christopher J. Morris, David Ebert, Penny Rheingans, Charles Hansen
Issue Date:November 2002
pp. N/A
Simulating hand-drawn illustration techniques can succinctly express information in a manner that is communicative and informative. We present a framework for an interactive direct volume illustration system that simulates traditional stipple drawing. By c...
 
Semotus Visum: A Flexible Remote Visualization Framework
Found in: Visualization Conference, IEEE
By Eric Luke, Charles Hansen
Issue Date:November 2002
pp. N/A
By offering more detail and precision, large data sets can provide greater insights to researchers than small data sets. However, these data sets require greater computing resources to view and manage. Remote visualization techniques allow the use of compu...
 
Interactive Translucent Volume Rendering and Procedural Modeling
Found in: Visualization Conference, IEEE
By Joe Kniss, Simon Premoze, Charles Hansen, David Ebert
Issue Date:November 2002
pp. N/A
Direct volume rendering is a commonly used technique in visualization applications. Many of these applications require sophisticated shading models to capture subtle lighting effects and characteristics of volumetric data and materials. Many common objects...
 
Multidimensional Transfer Functions for Interactive Volume Rendering
Found in: IEEE Transactions on Visualization and Computer Graphics
By Joe Kniss, Gordon Kindlmann, Charles Hansen
Issue Date:July 2002
pp. 270-285
<p>Most direct volume renderings produced today employ one-dimensional transfer functions which assign color and opacity to the volume based solely on the single scalar quantity which comprises the data set. Though they have not received widespread a...
 
Parallel Point Reprojection
Found in: Parallel and Large-Data Visualization and Graphics, IEEE Symposium on
By Erik Reinhard, Peter Shirley, Charles Hansen
Issue Date:October 2001
pp. 29-35
Improvements in hardware have recently made interactive ray tracing practical for some applications. However, when the scene complexity or rendering algorithm cost is high, the frame rate is too low in practice. Researchers have attempted to solve this pro...
 
Interactive Volume Rendering Using Multi-Dimensional Transfer Functions and Direct Manipulation Widgets
Found in: Visualization Conference, IEEE
By Joe Kniss, Gordon Kindlmann, Charles Hansen
Issue Date:October 2001
pp. N/A
Most direct volume renderings produced today employ one-dimensional transfer functions, which assign color and opacity to the volume based solely on the single scalar quantity which comprises the dataset. Though they have not received widespread attention,...
 
Interactive Texture-Based Volume Rendering for Large Data Sets
Found in: IEEE Computer Graphics and Applications
By Joe Kniss, Patrick McCormick, Allen McPherson, James Ahrens, Jamie Painter, Alan Keahey, Charles Hansen
Issue Date:July 2001
pp. 52-61
The authors present Trex, a scalable system that takes advantage of parallel graphics hardware, software based compositing, and high performance I/O. The goals of the application are to provide near interactive display rates for time-varying, terabyte size...
 
Interactive Simulation and Visualization
Found in: Computer
By Christopher Johnson, Steven G. Parker, Charles Hansen, Gordon L. Kindlmann, Yarden Livnat
Issue Date:December 1999
pp. 59-65
<p>Most researchers who perform data analysis and visualization do so only after everything else is finished, which often means that they don't discover errors invalidating the results of their simulation until postprocessing. A better approach would...
 
Interactive Ray Tracing for Volume Visualization
Found in: IEEE Transactions on Visualization and Computer Graphics
By Steven Parker, Michael Parker, Yarden Livnat, Peter-Pike Sloan, Charles Hansen, Peter Shirley
Issue Date:July 1999
pp. 238-250
<p><b>Abstract</b>—We present a brute-force ray tracing system for interactive volume visualization. The system runs on a conventional (distributed) shared-memory multiprocessor machine. For each pixel we trace a ray through a volume to c...
 
Interactive Ray Tracing for Isosurface Rendering
Found in: Visualization Conference, IEEE
By Steven Parker, Peter Shirley, Yarden Livnat, Charles Hansen, Peter-Pike Sloan
Issue Date:October 1998
pp. 233
We show that it is feasible to perform interactive isosurfacing of very large rectilinear datasets with brute-force ray tracing on a conventional (distributed) shared-memory multiprocessor machine. Rather than generate geometry representing the isosurface ...
 
View Dependent Isosurface Extraction
Found in: Visualization Conference, IEEE
By Yarden Livnat, Charles Hansen
Issue Date:October 1998
pp. 175
<p>We propose a new approach to polygonal isosurface extraction that is based on extracting only the visible portion of the isosurface. The visibility tests are done in two phases. First, coarse visibility tests are performed in software to determine...
 
Parallel Rendering Techniques for Massively Parallel Visualization
Found in: Parallel Algorithms / Architecture Synthesis, AIZU International Symposium on
By Charles Hansen, Michael Krogh, James Painter
Issue Date:March 1997
pp. 276
As the resolution of simulation models increases, scientific visualization algorithms which take advantage of the large memory and parallelism of Massively Parallel Processors (MPPs) are becoming increasingly important. For large applications rendering on ...
 
Boundary Aware Reconstruction of Scalar Fields
Found in: IEEE Transactions on Visualization and Computer Graphics
By Stefan Lindholm,Daniel Jonsson,Charles Hansen,Anders Ynnerman
Issue Date:February 2015
pp. 1
In visualization, the combined role of data reconstruction and its classification plays a crucial role. In this paper we propose a novel approach that improves classification of different materials and their boundaries by combining information from the cla...
 
Dynamic particle system for mesh extraction on the GPU
Found in: Proceedings of the 5th Annual Workshop on General Purpose Processing with Graphics Processing Units (GPGPU-5)
By Guoning Chen, Charles Hansen, Mark Kim
Issue Date:March 2012
pp. 38-46
Extracting isosurfaces represented as high quality meshes from three-dimensional scalar fields is needed for many important applications, particularly visualization and numerical simulations. One recent advance for extracting high quality meshes for isosur...
     
Stellar magnetism
Found in: Proceedings of the 2011 companion on High Performance Computing Networking, Storage and Analysis Companion (SC '11 Companion)
By Benjamin Brown, Chems Touati, John Clyne, Kelly Gaither, Carson Brownlee, Charles Hansen
Issue Date:November 2011
pp. 151-152
A Sun-like star undergoes magnetic cyclic reversal shown by field lines colored by the longitudinal magnetic field. Shifts in positive and negative polarity demonstrate large-scale polarity changes in the star. One such cycle is shown, and at the end of th...
     
Interactive ray tracing for volume visualization
Found in: ACM SIGGRAPH 2005 Courses (SIGGRAPH '05)
By Charles Hansen, Michael Parker, Peter Shirley, Peter-Pike Sloan, Steven Parker, Yarden Livnat
Issue Date:July 2005
pp. 15-es
We present a brute-force ray tracing system for interactive volume visualization. The system runs on a conventional (distributed) shared-memory multiprocessor machine. For each pixel we trace a ray through a volume to compute the color for that pixel. Alth...
     
Interactive ray tracing
Found in: ACM SIGGRAPH 2005 Courses (SIGGRAPH '05)
By Brian Smits, Charles Hansen, Peter Shirley, Peter-Pike J. Sloan, Steven Parker, William Martin
Issue Date:July 2005
pp. 12-es
We examine a rendering system that interactively ray traces an image on a conventional multiprocessor. The implementation is "brute force" in that it explicitly traces rays through every screen pixel, yet pays careful attention to system resources for acce...
     
Parallel lumigraph reconstruction
Found in: Proceedings of the 1999 IEEE symposium on Parallel visualization and graphics (PVGS '99)
By Charles Hansen, Peter-Pike Sloan
Issue Date:October 1999
pp. 7-14
This paper presents three techniques for reconstructing Lumigraphs/Lightfields on commercial ccNUMA parallel distributed shared memory computers. The first method is a parallel extension of the software-based method proposed in the Lightfield paper. This e...
     
Interactive ray tracing
Found in: Proceedings of the 1999 symposium on Interactive 3D graphics (SI3D '99)
By Brian Smits, Charles Hansen, Peter Shirley, Peter-Pike J. Sloan, Steven Parker, William Martin
Issue Date:April 1999
pp. 119-126
we present an exact and interactive collision detection system, I-COLLIDE, for large-scale environments. Such environments are characterized by the number of objects undergoing rigid motion and the complexity of the models. The algorithm does not assume th...
     
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