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Proceedings Paper

Soft decoding algorithm for watermarks subject to a jitter attack
Author(s): Severine Baudry; Philippe Nguyen; Henri Maitre
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Paper Abstract

Watermarking can be modeled as a transmission through a steganographic channel. Most of the channels studied up to now in the literature were additive or substitutive channels where the noise modifies the data value. But other modifications may occur, as geometric distortions: images may be cropped, scaled, non-linearly distorted etc. We model such transformations by a geometric channel, where the noise modifies the geometry of the image rather than the data values. We study the jitter channel which copies and deletes randomly some lines of the image. We use a Markov chain to model the channel, and propose an algorithm to enhance the detection of a watermark embedded by a spread-spectrum technique subject to a jitter attack.

Paper Details

Date Published: 7 December 2001
PDF: 11 pages
Proc. SPIE 4472, Applications of Digital Image Processing XXIV, (7 December 2001); doi: 10.1117/12.449750
Show Author Affiliations
Severine Baudry, Thales Communications and Ecole Nationale Superieure des Telecommunications (France)
Philippe Nguyen, Thales Communications (France)
Henri Maitre, Ecole Nationale Superieure des Telecommunications (France)


Published in SPIE Proceedings Vol. 4472:
Applications of Digital Image Processing XXIV
Andrew G. Tescher, Editor(s)

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