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
Tobias Isenberg, Angela Brennecke.
Computers & Graphics, Vol. 30, No. 5, pp. 754--766, October, 2006. [BibTeX]

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

Author(s): Henry Sonnet, Tobias Isenberg, Jana Dittmann, Thomas Strothotte.
Proceedings: 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] [DOI] Find this paper on Google

Abstract:
Digital watermarking is a technique for embedding information into data, such as images, 3D models, or audio files, such that some properties (i. e., security, imperceptibility, robustness) are maintained. While most of the existing watermarking techniques focus on encoding copyright information where security is one of the most important properties, we have developed algorithms for embedding Illustration Watermarks, i. e., content-related annotations for the image. Robustness against common media transformations, high capacity, and blind detection are our aspired properties while security and the usage of secure keys are less important. The medium that we are using for embedding data are 2D vector graphics. We introduce algorithms that change line attributes, introduce new vertices in certain patterns, and replace existing stroke segments by new lines in a stylistic way. Based on the modification they introduce, we categorize our techniques into whether they change the appearance of the image or not and whether the changes are perceivable by the naked eye or not. We demonstrate our techniques with silhouette lines obtained from 3D models. Such line drawings are a very common style utilized in many illustrations, in particular in the medical and technical domain.


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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