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Advanced illumination techniques for GPU-based volume raycasting 09

Advanced illumination techniques for GPU-based volume raycas...

引用

ACM SIGGRAPH 2009 Courses, SIGGRAPH '09

作者： Hadwiger, Markus Ljung, Patric Salama, Christof Rezk Ropinski, Timo VRVis Research Center for Virtual Reality and Visualization Donau-City-Straße 1 A-1220 Vienna Austria Siemens Corporate Research Imaging and Visualization Department 755 College Road East Princeton NJ 08540 United States Computer Graphics Group University of Siegen Hölderlinstr. 3 57068 Siegen Germany Visualization and Computer Graphics Research Group University of Münster Einsteinstr. 62 48149 Münster Germany

ISBN: (纸本)9781450379380

Volume raycasting techniques are important for both visual arts and visualization. They allow efficient generation of visual effects and visualization of scientific data obtained by tomography or numerical simulation. Volume-rendering techniques are also effective for direct rendering of implicit surfaces used for soft-body animation and constructive solid geometry. The focus of this course is on volumetric illumination techniques that approximate physically based light transport in participating media. Such techniques include interactive implementation of soft and hard shadows, ambient occlusion, and simple Monte Carlo-based approaches to global illumination, including translucency and scattering.

关键词： visualization

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Spherical terrain rendering using the hierarchical HEALPix grid

Spherical terrain rendering using the hierarchical HEALPix g...

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International Research and Training Group 1131 Workshop on visualization of Large and Unstructured Data Sets: Applications in Geospatial Planning, Modeling and Engineering, VLUDS 2011

作者： Westerteiger, Rolf Gerndt, Andreas Hamann, Bernd Braunschweig Germany CS Department Institute for Data Analysis and Visualization University of California Davis United States Computer Graphics and HCI Group University of Kaiserslautern Germany

ISBN: (纸本)9783939897460

We present an interactive spherical terrain rendering system employing a hierarchical subdivision of the HEALPix coordinate system using quadtrees. Compared to other parameterizations, the scheme avoids singularities and allows for efficient fusion of mixed-resolution digital elevation models and imagery. A Level-of-Detail heuristic is used to guarantee both high performance and visual fidelity. Unified treatment of DEM and imagery data is achieved by performing the HEALPix projection within a GPU shader. The system is applied to the exploration of Mars, using both MOLA (NASA) and HRSC (German Aerospace Center) data sets.

关键词： NASA

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The application of GPU particle tracing to diffusion tensor field visualization

The application of GPU particle tracing to diffusion tensor ...

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IEEE Conference on visualization

作者： P. Kondratieva J. Kruger R. Westermann Computer Graphics and Visualization Group Technische Universität München Germany Computer Graphics and Visualization Group Technische Universität München

In this paper we introduce GPU particle tracing for the visualization of 3D diffusion tensor fields. For about half a million particles, reconstruction of diffusion directions from the tensor field, time integration and rendering can be done at interactive rates. Different visualization options like oriented particles of diffusion-dependent shape, stream lines or stream tubes facilitate the use of particle tracing for diffusion tensor visualization. The proposed methods provide efficient and intuitive means to show the dynamics in diffusion tensor fields, and they accommodate the exploration of the diffusion properties of biological tissue.

关键词： Tensile stress visualization Shape Application software computer graphics Biological tissues Anisotropic magnetoresistance Aerodynamics Biology computing Biomedical imaging

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Age range estimation based on facial wrinkle analysis using hessian based filter 2nd

Age range estimation based on facial wrinkle analysis using ...

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2nd International Conference on Communication and computer Engineering, ICOCOE 2015

作者： Razalli, Husniza Rahmat, Rahmita Wirza O. K. Khalid, Fatimah Sulaiman, Puteri Suhaiza Signal Processing Lab TM Research and Development Cyberjaya Selangor Malaysia Computer Graphics Vision and Visualization Research Group Universiti Putra Malaysia Serdang Selangor Malaysia

ISBN: (纸本)9783319245829

Aging is a normal process that has an effect on different parts of the human body under the influence of various biological and environmental aspects. The most prominent changes that occur on the face are the form of the skin wrinkles, which are the main objective of this research. Specific wrinkle detection is an important task in face textural analysis. Previously, some researchers have been proposed the age range estimation based on wrinkle analysis in literature, but poor localization limits the performance of the whole age estimation process. This is because, when less number of wrinkles are detected or extracted, it will consequently affect the process to estimate the correct age. Therefore, we address this issue to enhance age range estimation method using a new approach to extract correct facial wrinkles for further analysis. We propose a method to extract facial wrinkle in face image using Hessian based filter (HBF) for age estimation. In other word, this research focus on age range estimation method based on facial wrinkle analysis extracted from facial image obtained from FG-NET database using hessian based filter. The proposed filter is theoretically straightforward, however, it significantly increases the wrinkle analysis result compared to previous methods. The result shows that HBF successfully obtained higher accuracy with over 90 % estimation rate. © Springer International Publishing Switzerland 2016.

关键词： Bandpass filters

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MoireGraphs: Radial focus+context visualization and interaction for graphs with visual nodes

MoireGraphs: Radial focus+context visualization and interact...

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9th Annual IEEE Symposium on Information visualization, InfoVis 2003

作者： Jankun-Kelly, T.J. Ma, Kwan-Liu Department of Computer Science and Engineering Mississippi State University MS 39762 United States Visualization and Graphics Research Group Department of Computer Science University of California Davis CA 95616 United States

ISBN: (纸本)0780381548

Graph and tree visualization techniques enable interactive exploration of complex relations while communicating topology. However, most existing techniques have not been designed for situations where visual information such as images is also present at each node and must be displayed. This paper presents MoireGraphs to address this need. MoireGraphs combine a new focus+context radial graph layout with a suite of interaction techniques (focus strength changing, radial rotation, level highlighting, secondary foci, animated transitions and node information) to assist in the exploration of graphs with visual nodes. The method is scalable to hundreds of displayed visual nodes. © 2003 IEEE.

关键词： visualization

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Providing high-level control and expert assistance in the user interface presentation design 93

Providing high-level control and expert assistance in the us...

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Proceedings of the INTERCHI '93 Conference on Human Factors in Computing Systems

作者： Kim, Won Chul Foley, James D. Department of Electrical Engineering and Computer Science The George Washington University Washington DC Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9051991339

Current user interface builders provide only low-level assistance, because they have knowledge of neither the application, nor the principles by which interface elements are combined effectively. We have developed a framework that unites the knowledge components essential for effective user interface presentation design. The framework consists of an application model (both a data model and a control model), a design process model that supports top-down iterative development, and graphic design knowledge that is used both to place dialog box elements such that their application dependent logical relationships are visually reinforced and to control design symmetry and balance. To demonstrate the framework's viability, we have constructed a tool based on encapsulated design knowledge that establishes high-level style preferences and provides expert assistance for the dialog box presentation design and menu structuring.

关键词： UI design process

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Opacity volume based halo generation and depth-dependent halos

Opacity volume based halo generation and depth-dependent hal...

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作者： Tao, Yubo Wang, Chao Lin, Hai Dong, Feng Clapworthy, Gordon State Key Lab of CAD and CG Zhejiang University Hangzhou China University of Wollongong Wollongong Australia Centre for Computer Graphics and Visualization University of Bedfordshire Luton United Kingdom

Halos are generally used to enhance depth perception and display spatial relationships in illustrative visualization. In this paper, we present a simple and effective method to create volumetric halo illustration. At the preprocessing stage, we generate, on graphics hardware, a view-independent halo intensity volume, which contains all of the potential halos around the boundaries of features, based on the opacity volume. During halo rendering, the halo intensity volume is used to extract halos only around the contours of structures for the current viewpoint. The performance of our approach is significantly faster than previous halo illustration methods, which perform both halo generation and rendering during direct volume rendering. We further propose depth-dependent halo effects, including depth color fading and depth width fading. These halo effects adaptively modulate the visual properties of halos to provide more perceptual cues for depth interpretation. Experimental results demonstrate the efficiency of our proposed approach and the effectiveness of depth-dependent halos. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Volume rendering

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BrainCove: A tool for voxel-wise fMRI brain connectivity visualization

BrainCove: A tool for voxel-wise fMRI brain connectivity vis...

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3rd Eurographics Workshop on VisualComputing in Biology and Medicine, EG VCBM 2012

作者： Van Dixhoorn, A.F. Milles, J. Van Lew, B. Botha, C.P. Computer Graphics and Visualization Dept. of INSY Delft University of Technology Delft Netherlands LKEB Dept. of Radiology Leiden University Medical Center Leiden Netherlands

ISBN: (纸本)9783905674385

Functional brain connectivity from fMRI studies has become an important tool in studying functional interactions in the human brain as a complex network. Most recently, research has started focusing on whole brain functional networks at the voxel-level, where fMRI time-signals at each voxel are correlated with every other voxel in the brain to determine their functional connectivity. For a typical 4mm isotropic voxel resolution, this results in connectivity networks with more than twenty thousand nodes and over 400 million links. These cannot be effectively visualized or interactively explored using node-link representations, and due to their size are challenging to show as correlation matrix bitmaps. In this paper, we present a number of methods for the visualization and interactive visual analysis of this new high resolution brain network data, both in its matrix representation as well as in its anatomical context. We have implemented these methods in a GPU raycasting framework that enables real-time interaction, such as network probing and volume deformation, as well as real-time filtering. The techniques are integrated in a visual analysis application in which the different views are coupled, supporting linked interaction. Furthermore, we allow visual comparison of different brain networks with side-by-side and difference visualization. We have evaluated our approach via case studies with domain scientists at two different university medical centers. © The Eurographics Association 2012.

关键词： visualization

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The experience of developing real-time rendering systems for the simulation and training 23

The experience of developing real-time rendering systems for...

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23rd International Conference on computer graphics and Vision, GraphiCon 2013

作者： Dolgovesov, Boris S. Morozov, Boris B. Synthesizing Visualization Systems Laboratory Institute of Automation and Electrometry SB RAS Russia Software Systems for Computer Graphics Laboratory Institute of Automation and Electrometry SB RAS Russia

ISBN: (纸本)9785804414024

This paper is about implementation of the presentations system based on integrated virtual reality technology. This system provides the combining of a virtual environment and a lecturer who can interact with object's models of a virtual environment real-time. Furthermore the system can combine different multimedia data (3D objects' models, video, Microsoft PowerPoint presentations, histograms, tomography data, etc.). This option expands the potential of interactive presentation process. © 23rd International Conference on computer graphics and Vision, GraphiCon 2013 - Conference Proceedings. All rights reserved.

关键词： Virtual reality

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Compression domain volume rendering

Compression domain volume rendering

引用

IEEE Conference on visualization

作者： J. Schneider R. Westermann Computer Graphics and Visualization Group Technical University Munich Germany

A survey of graphics developers on the issue of texture mapping hardware for volume rendering would most likely find that the vast majority of them view limited texture memory as one of the most serious drawbacks of an otherwise fine technology. In this paper, we propose a compression scheme for static and time-varying volumetric data sets based on vector quantization that allows us to circumvent this limitation. We describe a hierarchical quantization scheme that is based on a multiresolution covariance analysis of the original field. This allows for the efficient encoding of large-scale data sets, yet providing a mechanism to exploit temporal coherence in non-stationary fields. We show, that decoding and rendering the compressed data stream can be done on the graphics chip using programmable hardware. In this way, data transfer between the CPU and the graphics processing unit (GPU) can be minimized thus enabling flexible and memory efficient real-time rendering options. We demonstrate the effectiveness of our approach by demonstrating interactive renditions of Gigabyte data sets at reasonable fidelity on commodity graphics hardware.

关键词： Rendering (computer graphics) computer graphics Hardware Vector quantization Data visualization Large-scale systems Decoding Central Processing Unit Shock waves Encoding

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