Non-Photorealistic Computer Graphics Library

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Found 22 item(s) authored by "Tobias Isenberg" .
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Article G-strokes: A concept for simplifying line stylization

Author(s): Tobias Isenberg, Angela Brennecke.
Article: Computers & Graphics, Vol. 30, No. 5, pp. 754--766, October, 2006.
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Abstract:
In most previous NPR line rendering systems, geometric properties have been directly used to extract and stylize certain edges. However, this approach is bound to a tight stylization of strokes as the focus lies on the edge extraction. Styles are applied to the currently extracted edges, making it necessary to re-do certain computations whenever several different styles are to appear concurrently in the same rendition. Consequently, the generation of renditions is often constrained to one or two styles to keep computational cost low. To broaden the possibilities of generating highly expressive line drawings we introduce the concept of G-strokes. In contrast to the above-mentioned approach, we propose to keep all edges and to extract the geometric properties instead. According to these properties, one style could be applied to a particular set of edges and another style could be applied to another set of edges without having to extract the designated edges anew. This makes it easy to enrich the set of line stylization means, allowing more freedom and creativity for generating varied line drawings. We show a number of possible G-strokes using both simple and complex examples to demonstrate the power of our approach.

Article High Quality Hatching
Johannes Zander, Tobias Isenberg, Stefan Schlechtweg, Thomas Strothotte.
Computer Graphics Forum (EG'04), Vol. 23, No. 3, pp. 421--430, September, 2004. [BibTeX]

In Collection Hybrid Medical Visualizations: Creation and Evaluation
Tobias Isenberg.
Course Notes of the 60th Annual AMI Conference 2005, The Association of Medical Illustrators, Mario Costa Sousa, Non-Photorealistic Rendering (NPR)---Applied Research for the Medical Illustrator, Thousand Oaks, California, USA, July 28--August 1, 2005. [BibTeX]

Proceedings Illustration Watermarks for Vector Graphics
Henry Sonnet, Tobias Isenberg, Jana Dittmann, Thomas Strothotte.
11th Pacific Conference on Computer Graphics and Applications (PG'03), Jon Rokne, Reinhard Klein, and Wenping Wang, pp. 73--82, Los Alamitos, CA, 2003. [BibTeX]

Technical Report Non-Photorealistic Rendering in Context: An Observational Study
Tobias Isenberg, Petra Neumann, M. Sheelagh T. Carpendale, Mario Costa Sousa, Joaquim A. Jorge.
Department of Computer Science, University of Calgary, No. Technical Report 2005-805-36, Canada, December, 2005. [BibTeX]

Proceedings Non-Photorealistic Rendering in Context: An Observational Study
Tobias Isenberg, Petra Neumann, M. Sheelagh T. Carpendale, Mario Costa Sousa, Joaquim A. Jorge.
NPAR '06: Proceedings of the 4th international symposium on Non-photorealistic animation and rendering, pp. 115--126, New York, NY, USA, June, ACM Press, 2006. [BibTeX]

Proceedings OPENNPAR: A System for Developing, Programming, and Designing Non-Photorealistic Animation and Rendering
Nick Halper, Tobias Isenberg, Felix Ritter, Bert Freudenberg, Oscar E. Meruvia Pastor, Stefan Schlechtweg, Thomas Strothotte.
11th Pacific Conference on Computer Graphics and Applications (PG'03), pp. 424, Canmore, Canada, 2003. [BibTeX]

Technical Report Seeing Between the Strokes
Tobias Isenberg, Roland Jesse, Oscar E. Meruvia Pastor, Thomas Strothotte.
Department of Computer Science, Otto-von-Guericke University of Magdeburg, No. Technical Report 11/2004, Germany, 2004. [BibTeX]

Article Stylizing Silhouettes at Interactive Rates: From Silhouette Edges to Silhouette Strokes
Tobias Isenberg, Nick Halper, Thomas Strothotte.
Computer Graphics Forum, 2002. [BibTeX]

Proceedings Use of Hybrid Rendering Styles for Presentation
Roland Jesse, Tobias Isenberg.
11th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG), 2003. [BibTeX]

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