Line‐division‐based digital watermarking system for facilitating fair use of small‐size vector map content
Takaaki Yamada, Yasuhiro Fujii, Satoru Tezuka, Norihisa Komoda · Electronics and Communications in Japan · 2008
Abstract As many people use digital maps in the ubiquitous network, facilitating fair use has become a great issue for vector map content. Watermarks are a promising way to trace content and report contact information to end users. We clarify the technical requirement for a small‐size map including several hundred vectors. A line‐division‐based digital watermarking system based on inserting new points that divide a line segment, where the internal division ratio indicates the embedding information, is proposed. The ability of the method to survive daily user operations and trace content is evaluated. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 91(9): 11– 19, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecj.10010