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To address the technical problem that hinders the practical application of digital watermarks, an implementation method of digital watermarking against the geometric attacks with the lifting wavelet transform (LWT) is proposed. Based on the characteristics of the wavelet transform sub-bands, one of the wavelet sub-bands of the carrier image is divided into four blocks. This method is combined with...
A method to hide information into pictures in certificate that achieve robustness against printing and scanning is proposed. Aiming at three main distortions during the process of certificate manufacture, use and verification, the prediction error filter used in spatial watermarking. A kind of naturally robust watermark pattern is applied to resisting the local and small nonlinear distortion. The...
In this paper, a simple and robust watermarking algorithm using balanced multiwavelet transform is proposed. The latter transform we use achieves simultaneous orthogonality and symmetry without requiring any input prefiltering or border extending. This reduction in computational complexity makes the transform a good candidate for real-time watermarking implementations. Novelty of the system lies in...
In this paper, a simple while robust watermarking algorithm is proposed which can confirm the copyright without original image. The novelty of the system is that the watermarks are generated during the embedding procedure but not predetermined. The original image is transformed using Hear wavelet and flags are created with the secret key. Then the extracted flags using the secret key are compared...
One of the methods for detecting watermarks after geometrical distortions is correcting distorted watermarked image before detecting. In this paper, a definition of weight Hausdorff distance is defined. It is applied to evaluation the similarity between original and geometric distorted watermarking image. A fast divide and conquer strategy in six dimension is used to search the transformation parameters...
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