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Proceedings Paper

Watermarking geographic vector-data using a variable strip-size scheme
Author(s): Michael Voigt
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Paper Abstract

A blind watermarking system for geographic vector-data is proposed which is robust against the following attacks: polyline simplifications, cropping and shifting of data-points as well as small perturbations caused by random noise. The watermark information is embedded by changing the x/y-coordinates of the data-points within the tolerance range of the data. For that purpose the map is divided into horizontal and vertical stripes whose widths depend on a secret key. Each strip possesses a 0-line and a 1-line. Depending on the watermark information all points within a stripe are shifted on either one of the two lines. As a consequence of the variable strip-size structure no extra bits for synchronization are necessary. The application of the proposed scheme is not restricted to the case of vector geo-data, other kinds of vector-graphics data can be treated in the same way.

Paper Details

Date Published: 27 February 2007
PDF: 9 pages
Proc. SPIE 6505, Security, Steganography, and Watermarking of Multimedia Contents IX, 65051V (27 February 2007); doi: 10.1117/12.704557
Show Author Affiliations
Michael Voigt, Technical Univ. Darmstadt (Germany)


Published in SPIE Proceedings Vol. 6505:
Security, Steganography, and Watermarking of Multimedia Contents IX
Edward J. Delp; Ping Wah Wong, Editor(s)

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