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 fromthe 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 systemexhibits an excellent robustness.

Robust Watermarking of Cartographic Images / M. Barni; F. Bartolini; A. Piva; F. Salucco. - In: EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING. - ISSN 1110-8657. - STAMPA. - 2002:(2002), pp. 197-208. [10.1155/S1110865702000549]

Robust Watermarking of Cartographic Images

PIVA, ALESSANDRO;
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 fromthe 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 systemexhibits an excellent robustness.
2002
197
208
M. Barni; F. Bartolini; A. Piva; F. Salucco
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/361413
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