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Combined surface and volumetric occlusion shading
Found in: Visualization Symposium, IEEE Pacific
By Mathias Schott,Tobias Martin,A.V. Pascal Grosset,Carson Brownlee,Thomas Hollt,Benjamin P. Brown,Sean T. Smith,Charles D. Hansen
Issue Date:March 2012
pp. 169-176
In this paper, a method for interactive direct volume rendering is proposed that computes ambient occlusion effects for visualizations that combine both volumetric and geometric primitives, specifically tube shaped geometric objects representing streamline...
 
Ridge Extraction from Isosurfaces of Volumetric Data Using Implicit B-Splines
Found in: Shape Modeling and Applications, International Conference on
By Suraj Musuvathy, Tobias Martin, Elaine Cohen
Issue Date:June 2010
pp. 163-174
Ridges are extremal curves of principal curvatures on a surface that indicate salient intrinsic features of its shape. This paper presents a novel approach for extracting ridges of improved quality from isosurfaces of volumetric scalar-valued grids by conv...
 
Volumetric parameterization and trivariate b-spline fitting using harmonic functions
Found in: Proceedings of the 2008 ACM symposium on Solid and physical modeling (SPM '08)
By Elaine Cohen, Mike Kirby, Tobias Martin
Issue Date:June 2008
pp. 13-14
We present a methodology based on discrete volumetric harmonic functions to parameterize a volumetric model in a way that it can be used to fit a single trivariate B-spline to data so that simulation attributes can also be modeled. The resulting model repr...
     
From pay-tv to pay-streaming: similarities and differences
Found in: Proceedings of the 2001 workshop on Multimedia and security: new challenges (MM&Sec '01)
By Erik Neumann, Jorg Schwenk, Tobias Martin
Issue Date:October 2001
pp. 40-43
In this paper, we want to point out similarities and differences between digital Pay-TV, which uses MPEG-2 transport streams, and its future analogue for IP based services, which we call Pay-Streaming. After an introduction to encryption, re-keying and key...
     
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