Illustration Watermarks for Vector Graphics
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.
|Henry Sonnet, Tobias Isenberg, Jana Dittmann, and Thomas Strothotte (2003) Illustration Watermarks for Vector Graphics. In Jon Rokne, Reinhard Klein, and Wenping Wang, eds., Proceedings of the 11th Pacific Conference on Computer Graphics and Applications, Pacific Graphics (PG, October 8–10, Canmore, Alberta, Canada). Los Alamitos, CA. IEEE, pages 73–82, 2003. Also see the technical report on illustration watermarks.|
|Henry Sonnet, Andrea Unger, Lothar Schlesier, Thomas Vogel, Tobias Isenberg, and Thomas Strothotte (2006) Interactive Images using Illustration Watermarks: Techniques, Study, and Applications. Technical Report, FIN Preprint Series 7/2006, Department of Computer Science, Otto-von-Guericke University of Magdeburg, June 2006. Also see the paper at Pacific Graphics 2003 on illustration watermarks for vector graphics.|