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Improved image watermarking scheme using fast Hadamard and discrete wavelet transforms

[+] Author Affiliations
Emad E. Abdallah

Concordia Institute for Information Systems Engineering, Concordia University, Montréal, Québec, Canada

A. Ben Hamza

Concordia Institute for Information Systems Engineering, Concordia University, Montréal, Québec, Canada

Prabir Bhattacharya

Concordia Institute for Information Systems Engineering, Concordia University, Montréal, Québec, Canada

J. Electron. Imaging. 16(3), 033020 (August 03, 2007). doi:10.1117/1.2764466
History: Received November 22, 2006; Revised March 26, 2007; Accepted March 26, 2007; Published August 03, 2007
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We propose a robust image watermarking scheme by applying the fast Hadamard transform (FHT) to small blocks computed from the four discrete wavelet transform (DWT) subbands. Different transforms have different properties that can effectively match various aspects of the signal’s frequencies. Our approach consists of four main steps: (1) we decomposed the original image into four subbands, (2) the four subbands are divided into blocks; (3) FHT is applied to each block; and (4) the singular-value decomposition (SVD) is applied to the watermark image prior to distributing the singular values over the DC components of the transformed blocks. The proposed technique improves the data embedding system effectively, the watermark imperceptibility, and its resistance to a wide range of intentional attacks. The experimental results demonstrate the improved performance of the proposed method in comparison with existing techniques in terms of the watermark imperceptibility and the robustness against attacks.

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Citation

Emad E. Abdallah ; A. Ben Hamza and Prabir Bhattacharya
"Improved image watermarking scheme using fast Hadamard and discrete wavelet transforms", J. Electron. Imaging. 16(3), 033020 (August 03, 2007). ; http://dx.doi.org/10.1117/1.2764466


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