S. Panyapolsakul and T. Amornraksa (Thailand)
Digital image processing, Wavelet packet transform,Zerotrees, Digital watermarking
Digital watermarking is a technique that many people use for protecting their own work when they reveal their original work to the public. This paper proposes a digital watermarking technique by using the zerotrees derived from a pre-defined threshold value of the wavelet packet coefficients in order to embed the watermark signal into the original image. To extract the embedded signal from the watermarked image the same steps as used in the embedding process are performed in reverse, without requiring the original copy. The experimental results show the effectiveness of the proposed technique against various attacks such as brightness/contrast enhancement, high-pass filtering, Gaussian noise adding and JPEG compression standard.
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