@misc{RosanwoPetzProhaskaetal.2008, author = {Rosanwo, Olufemi and Petz, Christoph and Prohaska, Steffen and Hotz, Ingrid and Hege, Hans-Christian}, title = {Dual Streamline Seeding - Method and Implementation}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-11032}, number = {08-49}, year = {2008}, abstract = {This work introduces a novel streamline seeding technique based on dual streamlines that are orthogonal to the vector field, instead of tangential. The greedy algorithm presented here produces a net of orthogonal streamlines that is iteratively refined resulting in good domain coverage and a high degree of continuity and uniformity. The algorithm is easy to implement and efficient, and it naturally extends to curved surfaces.}, language = {en} } @misc{KlindtBaumProhaskaetal.2013, author = {Klindt, Marco and Baum, Daniel and Prohaska, Steffen and Hege, Hans-Christian}, title = {iCon.text - a customizable iPad app for kiosk applications in museum exhibitions}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-17731}, year = {2013}, abstract = {We present iCon.text, a kiosk platform for the iPad centered around artefacts, whose content and layout can be tailored without programming skills for specific museum exhibitions. The central metaphor to access information is a virtual postcard with one front and a customizable number of back sides that provide details about exhibits to museum visitors in textual and image form. Back sides can link to others cards. Access to these postcards is possible through one or more navigation views that can be navigated to from a navigation bar. The entry point to the application is designed as a multitouch interactive pile of cards in a playful manner that allows visitors of any age an easy approach to the presentation and interaction metaphor. To directly access a certain postcard, a mosaic view can be uitilized to provide an overview about all available exhibits. A category view groups postcards into themes. Locating artefacts on a zoomable map or exhibition floor plan allows for conveying information about spatial contexts between different objects and their location. Furthermore, contexts can be illustrated with a two stage view comprising an overview and corresponding detail views to provide further insights into the spatial, temporal, and thematic contexts of artefacts. The application scaffolding allows the design of bilingual presentations to support exhibitions with an international audience. The logo of the presenting institution or exhibition can be incorporated to display the the kiosk's corporate design branding and to access an imprint or further informations. Usage is logged into files to provide a basis for extracting statistical information about the usage. The details about the exhibits are presented as images and as such impose no limit to the design choices made by the content provider or exhibition designer. The application (enhanced with a panoramic view) has been integrated successfully into a large special exhibition about the ancient city of Pergamon 2011/2012 at the Pergamon Museum Berlin within the interdisciplinary project "Berlin Sculpture Network".}, language = {en} } @book{HegeEds1998, author = {Hege, Hans-Christian and (Eds.), Konrad}, title = {Mathematical Visualization - Algorithms, Applications, and Numerics}, publisher = {Springer}, address = {Heidelberg}, isbn = {ISBN 3-540-63991-8}, year = {1998}, language = {en} } @book{HegePolthier1998, author = {Hege, Hans-Christian and Polthier, Konrad}, title = {VideoMath - Festival at ICM 98}, journal = {Springer VideoMath}, isbn = {978-3-540-21385-7}, year = {1998}, language = {en} } @book{HegeEds1997, author = {Hege, Hans-Christian and (Eds.), Konrad}, title = {Visualization and Mathematics - Experiments, Simulations and Environments}, publisher = {Springer-Verlag, Berlin/Heidelberg}, isbn = {ISBN 3-540-61269-6}, year = {1997}, language = {en} } @misc{EhlkeRammLameckeretal.2013, author = {Ehlke, Moritz and Ramm, Heiko and Lamecker, Hans and Hege, Hans-Christian and Zachow, Stefan}, title = {Fast Generation of Virtual X-ray Images from Deformable Tetrahedral Meshes}, issn = {1438-0064}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-41896}, year = {2013}, abstract = {We propose a novel GPU-based approach to render virtual X-ray projections of deformable tetrahedral meshes. These meshes represent the shape and the internal density distribution of a particular anatomical structure and are derived from statistical shape and intensity models (SSIMs). We apply our method to improve the geometric reconstruction of 3D anatomy (e.g.\ pelvic bone) from 2D X-ray images. For that purpose, shape and density of a tetrahedral mesh are varied and virtual X-ray projections are generated within an optimization process until the similarity between the computed virtual X-ray and the respective anatomy depicted in a given clinical X-ray is maximized. The OpenGL implementation presented in this work deforms and projects tetrahedral meshes of high resolution (200.000+ tetrahedra) at interactive rates. It generates virtual X-rays that accurately depict the density distribution of an anatomy of interest. Compared to existing methods that accumulate X-ray attenuation in deformable meshes, our novel approach significantly boosts the deformation/projection performance. The proposed projection algorithm scales better with respect to mesh resolution and complexity of the density distribution, and the combined deformation and projection on the GPU scales better with respect to the number of deformation parameters. The gain in performance allows for a larger number of cycles in the optimization process. Consequently, it reduces the risk of being stuck in a local optimum. We believe that our approach contributes in orthopedic surgery, where 3D anatomy information needs to be extracted from 2D X-rays to support surgeons in better planning joint replacements.}, language = {en} } @inproceedings{AllenBengerGoodaleetal.2000, author = {Allen, Gabrielle and Benger, Werner and Goodale, Tom and Hege, Hans-Christian and Lanfermann, Gerd and Merzky, Andr{\´e} and Radke, Thomas and Seidel, Edward and Shalf, John}, title = {The Cactus Code: A Problem Solving Environment for the Grid}, booktitle = {High Performance Distributed Computing (HPDC-2000)}, doi = {10.1109/HPDC.2000.868657}, pages = {253 -- 260}, year = {2000}, language = {en} } @misc{Hege2000, author = {Hege, Hans-Christian}, title = {Virtuelle Experimente Sieben H{\"u}gel - Bilder und Zeichen des 21. Jahrhunderts}, year = {2000}, language = {en} } @article{AllenBengerDramlitschetal.2001, author = {Allen, Gabrielle and Benger, Werner and Dramlitsch, Thomas and Goodale, Tom and Hege, Hans-Christian and Lanfermann, Gerd and Merzky, Andr{\´e} and Radtke, Thomas and Seidel, Edward and Shalf, John}, title = {Cactus Tools for Grid Applications}, volume = {4}, journal = {Cluster Computing}, number = {3}, doi = {10.1023/A:1011491422534}, pages = {179 -- 188}, year = {2001}, language = {en} } @inproceedings{AllenBengerDramlitschetal.2001, author = {Allen, Gabrielle and Benger, Werner and Dramlitsch, Thomas and Goodale, Tom and Hege, Hans-Christian and Lanfermann, Gerd and Merzky, Andr{\´e} and Radke, Thomas and Seidel, Edward}, title = {Cactus Grid Computing: Review of Current Devlopment}, volume = {2150}, booktitle = {Proceedings of Euro-Par 2001: 7th International Euro-Par Conference on Parallel Processing}, editor = {Sakellariou, Rizos and Keane, Jon and Gurd, John and Freeman, Len}, publisher = {Springer Verlag, Berlin Heidelberg 2001}, doi = {10.1007/3-540-44681-8_115}, pages = {817 -- 824}, year = {2001}, language = {en} }