Open Access

Robust Watermarking of Cartographic Images

  • Mauro Barni1Email author,
  • Franco Bartolini2,
  • Alessandro Piva2 and
  • Filippo Salucco2
EURASIP Journal on Advances in Signal Processing20022002:458037

https://doi.org/10.1155/S1110865702000549

Received: 30 April 2001

Published: 14 February 2002

Abstract

We present a method (Text-Based Geometric Normalization—TBGN) which, by exploiting the particular content of cartographic images, namely text content, permits to cope with global geometric transformations. First, text is extracted from the to-be-marked map, then text orientation and size are exploited to normalize the image geometry prior to watermark insertion. Watermarking is performed by means of any of the existing algorithms ensuring good robustness against image processing tools. At the decoder side, text is extracted again from the map and used to normalize image geometry. Owing to the robustness of text features with respect to common image manipulations, and to the likely spreading of text all across the digital map, the proposed system exhibits an excellent robustness.

Keywords

digital watermarking map watermarking robust watermarking geometric normalization

Authors’ Affiliations

(1)
Department of Information Engineering, University of Siena
(2)
Department of Electronics and Telecommunications, University of Florence

Copyright

© Barni et al. 2002