Robust watermarking of cartographic images

Authors:
Mauro Barni;Franco Bartolini;Alessandro Piva;Filippo Salucco
Affiliations:
Department of Information Engineering, University of Siena, Siena, Italy;Department of Electronics and Telecommunications, University of Florence, Firenze, Italy;Department of Electronics and Telecommunications, University of Florence, Firenze, Italy;Department of Electronics and Telecommunications, University of Florence, Firenze, Italy
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2002

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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.