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1 July 2007 Improved image watermarking scheme using fast Hadamard and discrete wavelet transforms
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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.
©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)
Emad Eddien Abdallah, Abdessamad Ben Hamza, and Prabir Bhattacharya "Improved image watermarking scheme using fast Hadamard and discrete wavelet transforms," Journal of Electronic Imaging 16(3), 033020 (1 July 2007).
Published: 1 July 2007

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