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Interactive Global Light Propagation in Direct Volume Rendering using Local Piecewise Integration
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0002-9288-5322
Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.ORCID iD: 0000-0002-9466-9826
2008 (English)In: Volume and Point-Based Graphics 2008, Eurographics / IEEE VGTC Symposium Proceedings Seventh International Symposium on Volume Graphics, Eurographics Association , 2008, 105-112 p.Conference paper, Published paper (Refereed)
Abstract [en]

A novel technique for efficient computation of global light propagation in interactive DVR is presented in this paper. The approach is based on a combination of local shadows from the vicinity of each voxel with global shadows calculated at high resolution but stored in a sparser grid. The resulting intensities are then used as the initial illumination for an additional pass that computes first order scattering effects. The method captures global shadowing effects with enhanced shadows of near structures. A GPU framework is used to evaluate the illumination updates at interactive frame rates, using incremental refinements of the in-scattered light. 

Place, publisher, year, edition, pages
Eurographics Association , 2008. 105-112 p.
Keyword [en]
Volume Visualization
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-43971DOI: 10.2312/VG/VG-PBG08/105-112Local ID: 75259OAI: oai:DiVA.org:liu-43971DiVA: diva2:264832
Conference
Volume and Point-Based Graphics 2008, Eurographics / IEEE VGTC Symposium Proceedings Seventh International Symposium on Volume Graphics Fifth Symposium on Point-Based Graphics, Los Angeles, California, USA August 10 – 11
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-09-22Bibliographically approved
In thesis
1. Efficient Methods for Volumetric Illumination
Open this publication in new window or tab >>Efficient Methods for Volumetric Illumination
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Modern imaging modalities can generate three-dimensional datasets with a very high detail level. To transfer all the information to the user in an efficient way there is a need for three-dimensional visualization. In order to enhance the diagnostic capabilities the utilized methods must supply the user with fast renderings that are easy to interpret correctly.

It can thus be a challenge to visualize a three-dimensional dataset in a way that allows the user to perceive depth and shapes. A number of stereoscopic solutions are available on the market but it is in many situations more practical and less expensive to use ordinary two-dimensional displays. Incorporation of advanced illumination can, however, improve the perception of depth in a rendering of a volume. Cast shadows provide the user with clues of distances and object hierarchy. Simulating realistic light conditions is, however, complex and it can be difficult to reach interactive frame rates. Approximations and clever implementations are consequently required.

This thesis presents efficient methods for calculation of illumination with the objective of providing the user with high spatial and shape perception. Two main types of light conditions, a single point light source and omni-directional illumination, are considered. Global transport of light is efficiently estimated using local piecewise integration which allows a graceful speed up compared to brute force techniques. Ambient light conditions are calculated by integrating the incident light along rays within a local neighborhood around each point in the volume.

Furthermore, an approach that allows the user to highlight different tissues, using luminous materials, is also available in this thesis. A multiresolution data structure is employed in all the presented methods in order to support evaluation of illumination for large scale data at interactive frame rates.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 59 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1406
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-71460 (URN)978-91-7393-041-3 (ISBN)
Public defence
2011-11-25, Wrannesalen, Center for Medical Image Science and Visualization, Campus US, Linköpings universitet, Linköping, 13:00 (English)
Opponent
Supervisors
Available from: 2011-10-19 Created: 2011-10-19 Last updated: 2015-09-22Bibliographically approved

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Publisher's full texthttp://www.eg.org/EG/DL/WS/VG/VG-PBG08/105-112.pdf

Authority records BETA

Hernell, FridaLjung, PatricYnnerman, Anders

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