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In this paper, a robust image watermarking algorithm in multiwavelet domain is proposed. Multiwavelet transform provides good energy compaction and trade off between imperceptibility and watermark robustness properly. In the proposed algorithm, after performing a three-level multiwavelet decomposition, a parent-child relationship is defined between coefficients in different subbands. To increase the...
In this paper,we introduce a robust image watermarking method based on Hilbert-Huang Transform against geometric distortion. This watermarking is detected by a linear frequency change. The Hilbert-Huang transformation is used to detect the watermark. The chirp signals are used as watermarks and this type of signals is resistant to all stationary filtering methods and exhibits geometrical symmetry...
An image watermarking scheme resistant to rotation scale translation (RST) attacks is proposed based on scale invariant feature transform (SIFT). Suitable feature points are selected to form a convex hull, which is then optimally triangulated by dynamic programming. The triangle chords inside the hull are then sampled equispacedly with secrect key K to obtain smaller triangles. The watermark is then...
This paper introduces a novel approach of watermarking for copyright protection applications using the singular value decomposition (SVD) in the dual tree complex wavelet transform (DT-CWT) domain. After applying the 2-level DT-CWT to the cover grayscale image, we apply the SVD to each high-pass subband obtained. The singular values in each subband are then modified by the singular values of the DT-CWT-transformed...
The human visual system exhibits reduced sensitivity to distortions in the regions of an image where the rate of change is significant. This entails that a watermark with significant value can be robust and if it resides near around edges and textured areas of an image, it would be imperceptible as well. The present work exploits this characteristic of the human visual system to embed a robust and...
In this paper we present a blind low frequency watermarking scheme on gray level images, which is based on DCT transform and spread spectrum communications technique. We compute the DCT of non overlapping 8times8 blocks of the hostimage, then using the DC coefficients of each block we construct a low-resolution approximation image. We apply block based DCT on this approximation image, then a pseudo...
This paper presents two quantization based image watermarking schemes in dual tree complex wavelet transform (DTCWT) domain. The energy map of the original image is first computed from the six high-frequency sub-bands of DTCWT, and the watermark is embedded into the high-energy pixels. The proposed two schemes embed the watermark by quantizing the high-frequency and low-frequency DTCWT coefficients,...
Watermarking techniques are used as a solution to copyright protection of digital media files. In this work, a new and robust watermarking method that is based on spatio-frequency (SF) representations is presented. We use the discrete evolutionary transform calculated by the Gabor expansion to represent an image in the SF domain. A watermark is embedded onto selected cells in the joint SF domain....
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