Optimum decoding and detection of multiplicative watermarks

Authors:
M. Barni;F. Bartolini;A. De Rosa;A. Piva
Affiliations:
Dept. of Inf. Eng., Univ. of Siena, Italy;-;-;-
Venue:
IEEE Transactions on Signal Processing
Year:
2003

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Abstract

This work addresses the problem of optimum decoding and detection of a multibit, multiplicative watermark hosted by Weibull-distributed features: a situation which is classically encountered for image watermarking in the magnitude-of-DFT domain. As such, this work can be seen as an extension of the system described in a previous paper, where the same problem is addressed for the case of 1-bit watermarking. The theoretical analysis is validated through Monte Carlo simulations. Although the structure of the optimum decoder/detector is derived in the absence of attacks, some experimental results are also presented, giving a measure of the overall robustness of the watermark when attacks are present.