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Documents authored by Hering-Bertram, Martin


Document
Simulation and Visualization of Medical Application to the Inner Ear of the Guinea Pig to Reduce Animal Experiments

Authors: Martin Hering-Bertram, Norbert Siedow, Oliver Tse, Stefan K. Plontke, and Ruth Gill

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
We present a novel approach to simulate drug application to the inner ear of the guinea pig with the goal to reduce animal experiments and to increase the accuracy of measurements. The framework is based on a tetrahedral grid representing the individual compartments of the cochlea, associated with a finite element model used to simulate medical diffusion and clearance. In a first simulation scenario, we were able to compute transfer coefficients between the inner compartments of the ear, validating experiments from the literature, and to prove the existence of clearance at the inner scala tympani. In a second scenario, the cochlea was unwound to obtain a one-dimensional model for efficient simulation-based transfer coefficient identification. These coefficients are useful to predict the impact of novel medication application systems.

Cite as

Martin Hering-Bertram, Norbert Siedow, Oliver Tse, Stefan K. Plontke, and Ruth Gill. Simulation and Visualization of Medical Application to the Inner Ear of the Guinea Pig to Reduce Animal Experiments. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 103-117, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{heringbertram_et_al:DFU.Vol2.SciViz.2011.103,
  author =	{Hering-Bertram, Martin and Siedow, Norbert and Tse, Oliver and Plontke, Stefan K. and Gill, Ruth},
  title =	{{Simulation and Visualization of Medical Application to the Inner Ear of the Guinea Pig to Reduce Animal Experiments}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{103--117},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.103},
  URN =		{urn:nbn:de:0030-drops-32895},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.103},
  annote =	{Keywords: Cochlea, Perilymph, Spiral Ligament, Round Window Application, Modiolar Communication Routes, Numerical Simulation, Parameter Identification}
}
Document
Construction of Implicit Surfaces from Point Clouds Using a Feature-based Approach

Authors: Patric Keller, Oliver Kreylos, Eric S. Cowgill, Louise H. Kellogg, and Martin Hering-Bertram

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
We present a novel feature-based approach to surface generation from point clouds in three-dimensional space obtained by terrestrial and airborne laser scanning. In a first step, we apply a multiscale clustering and classification of local point set neighborhoods by considering their geometric shape. Corresponding feature values quantify the similarity to curve-like, surface-like, and solid-like shapes. For selecting and extracting surface features, we build a hierarchical trivariate B-spline representation of this surface feature function. Surfaces are extracted with a variant of marching cubes (MC), providing an inner and outer shell that are merged into a single non-manifold surface component at the field’s ridges. By adapting the isovalue of the feature function the user may control surface topology and thus adapt the extracted features to the noise level of the underlying point cloud. User control and adaptive approximation make our method robust for noisy and complex point data.

Cite as

Patric Keller, Oliver Kreylos, Eric S. Cowgill, Louise H. Kellogg, and Martin Hering-Bertram. Construction of Implicit Surfaces from Point Clouds Using a Feature-based Approach. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 129-143, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{keller_et_al:DFU.Vol2.SciViz.2011.129,
  author =	{Keller, Patric and Kreylos, Oliver and Cowgill, Eric S. and Kellogg, Louise H. and Hering-Bertram, Martin},
  title =	{{Construction of Implicit Surfaces from Point Clouds Using a Feature-based Approach}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{129--143},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.129},
  URN =		{urn:nbn:de:0030-drops-33032},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.129},
  annote =	{Keywords: 3D Point Clouds, Surface Reconstruction, Implicit Surfaces}
}
Document
Generation of Adaptive Streak Surfaces Using Moving Least Squares

Authors: Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 2, Scientific Visualization: Interactions, Features, Metaphors (2011)


Abstract
We introduce a novel method for the generation of fully adaptive streak surfaces in time-varying flow fields based on particle advection and adaptive mesh refinement. Moving least squares approximation plays an important role in multiple stages of the proposed algorithm, which adaptively refines the surface based on curvature approximation and circumradius properties of the underlying Delaunay mesh. We utilize the grid-less Moving Least Squares approximation method for both curvature and surface estimation as well as vector field evaluation during particle advection. Delaunay properties of the surface triangulation are guaranteed by edge flipping operations on the progressive surface mesh. The results of this work illustrate the benefit of adaptivity techniques to streak surface generation and provide the means for a qualitative analysis of the presented approach.

Cite as

Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen. Generation of Adaptive Streak Surfaces Using Moving Least Squares. In Scientific Visualization: Interactions, Features, Metaphors. Dagstuhl Follow-Ups, Volume 2, pp. 260-275, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InCollection{obermaier_et_al:DFU.Vol2.SciViz.2011.260,
  author =	{Obermaier, Harald and Hering-Bertram, Martin and Kuhnert, J\"{o}rg and Hagen, Hans},
  title =	{{Generation of Adaptive Streak Surfaces Using Moving Least Squares}},
  booktitle =	{Scientific Visualization: Interactions, Features, Metaphors},
  pages =	{260--275},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-26-2},
  ISSN =	{1868-8977},
  year =	{2011},
  volume =	{2},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.Vol2.SciViz.2011.260},
  URN =		{urn:nbn:de:0030-drops-32982},
  doi =		{10.4230/DFU.Vol2.SciViz.2011.260},
  annote =	{Keywords: scattered, flow, streak surface, adaptivity, moving least squares}
}
Document
On Moving Least Squares Based Flow Visualization

Authors: Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen

Published in: OASIcs, Volume 19, Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop) (2011)


Abstract
Modern simulation and measurement methods tend to produce meshfree data sets if modeling of processes or objects with free surfaces or boundaries is desired. In Computational Fluid Dynamics (CFD), such data sets are described by particle-based vector fields. This paper presents a summary of a selection of methods for the extraction of geometric features of such point-based vector fields while pointing out its challenges, limitations, and applications.

Cite as

Harald Obermaier, Martin Hering-Bertram, Jörg Kuhnert, and Hans Hagen. On Moving Least Squares Based Flow Visualization. In Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop). Open Access Series in Informatics (OASIcs), Volume 19, pp. 55-63, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2011)


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@InProceedings{obermaier_et_al:OASIcs.VLUDS.2010.55,
  author =	{Obermaier, Harald and Hering-Bertram, Martin and Kuhnert, J\"{o}rg and Hagen, Hans},
  title =	{{On Moving Least Squares Based Flow  Visualization}},
  booktitle =	{Visualization of Large and Unstructured Data Sets - Applications in Geospatial Planning, Modeling and Engineering (IRTG 1131 Workshop)},
  pages =	{55--63},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-29-3},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{19},
  editor =	{Middel, Ariane and Scheler, Inga and Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.VLUDS.2010.55},
  URN =		{urn:nbn:de:0030-drops-30979},
  doi =		{10.4230/OASIcs.VLUDS.2010.55},
  annote =	{Keywords: Moving Least Squares, Approximation, Flow, Scientific Visualization}
}
Document
Audio-visual Virtual Reality System for Room Acoustics

Authors: Eduard Deines, Martin Hering-Bertram, Jan Mohring, Jevgenijs Jegorovs, and Hans Hagen

Published in: Dagstuhl Follow-Ups, Volume 1, Scientific Visualization: Advanced Concepts (2010)


Abstract
We present an audio-visual Virtual Reality display system for simulated sound fields. In addition to the room acoustic simulation by means of phonon tracing and finite element method this system includes the stereoscopic visualization of simulation results using a 3D back projection system as well as auralization by use of a professional sound equipment. For auralization purposes we develop a sound field synthesis approach for accurate control of the loudspeaker system.

Cite as

Eduard Deines, Martin Hering-Bertram, Jan Mohring, Jevgenijs Jegorovs, and Hans Hagen. Audio-visual Virtual Reality System for Room Acoustics. In Scientific Visualization: Advanced Concepts. Dagstuhl Follow-Ups, Volume 1, pp. 303-320, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2010)


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@InCollection{deines_et_al:DFU.SciViz.2010.303,
  author =	{Deines, Eduard and Hering-Bertram, Martin and Mohring, Jan and Jegorovs, Jevgenijs and Hagen, Hans},
  title =	{{Audio-visual Virtual Reality System for Room Acoustics}},
  booktitle =	{Scientific Visualization: Advanced Concepts},
  pages =	{303--320},
  series =	{Dagstuhl Follow-Ups},
  ISBN =	{978-3-939897-19-4},
  ISSN =	{1868-8977},
  year =	{2010},
  volume =	{1},
  editor =	{Hagen, Hans},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DFU.SciViz.2010.303},
  URN =		{urn:nbn:de:0030-drops-27128},
  doi =		{10.4230/DFU.SciViz.2010.303},
  annote =	{Keywords: Special Relativity, Minkowski, Spacetime, Virtual Camera}
}
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