A high capacity watermarking system for digital maps

Authors:
Gerrit Schulz;Michael Voigt
Affiliations:
Institut für Nachrichtentechnik;Institut für Nachrichtentechnik
Venue:
Proceedings of the 2004 workshop on Multimedia and security
Year:
2004

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Abstract

This paper presents a way to embed watermarks into 2D vectordata. The watermarking system provides a high capacity and is robust against the following attacks: polyline simplifications like the Douglas-Peucker algorithm [1], moving and cropping of data and addition of small amounts of random noise. The system is designed for adding information to digital maps. The attacks mentioned above can happen during the daily work with these maps, so the watermark will not be destroyed by working with the data. Nevertheless it is possible to destroy it on purpose by using other attacks. The information is embedded by changing the x/y-coordinates of datapoints within the tolerance of the data. A block code is used to reconstruct missing data when not enough datapoints are available and a synchronization provides a way to detect the information even when the map is cropped.