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Type: Journal article
Title: The application of saturating detectors to a DCT-domain watermarking scheme
Author: Duan, F.
Abbott, D.
Chapeau-Blondeau, F.
Citation: Fluctuation and Noise Letters, 2008; 8(1):L65-L79
Publisher: World Scientific Publishing Co. Pty. Ltd.
Issue Date: 2008
ISSN: 0219-4775
Statement of
Fabing Duan, Derek Abbott and Francois Chapeau-Blondeau
Abstract: The present paper proposes a discrete cosine transform (DCT) domain watermarking scheme by exploiting nonlinear dynamical saturating detectors in the design of a watermark detection process. A binary copyright character, i.e. watermark to be hidden into an image, is firstly reordered into a binary zig-zag sequence, and then mapped onto the pulse amplitude modulated signal. A certain desynchronization time delay can be deliberately placed into one code of the modulated signal, and is tolerated due to the superior robustness of nonlinear detectors over matched filters. A selected set of DCT coefficients of a host image in a mid frequency range is shuffled by the Arnold transform, which makes it look more like background noise with respect to the watermark signal. Then, the watermark signal is embedded in the set of shuffled DCT coefficients. The copyright character can be extracted by a nonlinear saturating detector without prior knowledge of the original image and watermark, i.e. blind watermark detection. Interestingly, a higher match between the original watermark character and the extracted one can be further achieved by a parallel array of nonlinear detectors via the mechanism of array stochastic resonance. Robustness of the proposed watermarking scheme is shown in the presence of noise, filtering, cropping, and compression.
Keywords: saturating detector; watermark detection; Arnold transform; array stochastic resonance
Description: Copyright © 2008 World Scientific Publishing Co. All rights reserved.
RMID: 0020080498
DOI: 10.1142/S0219477508004271
Appears in Collections:Electrical and Electronic Engineering publications

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