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Protecting images against illegal duplications is an important fact and recently many watermarking algorithms have been published. In this paper an enhanced SVD-based watermarking algorithm is proposed. In the proposed method U component is explored for embedding the watermark. Experimental results show that imperceptibility and robustness of the algorithm is good.
This paper addresses a new robust watermarking scheme based on Nonsubsampled Contourlet Transform (NSCT) for digital images. The watermark is embedded in the selected important sub-blocks in the low frequency sub-band in the nonsubsampled contourlet domain using the tree structure and the texture feature of the NSCT coefficients. Experimental results show that this algorithm gives better robustness...
In this paper we evaluate degradation of an image due to the implementation of a watermark in the frequency domain of the image. As a metric Peak Signal to Noise Ratio (PSNR) is used. The degradation is calculated for three different cases, the strength of the watermark implementation, the frequencies that are modified by the watermark implementation, and the length of the watermark. The watermark...
In this paper a new complete technique using one dimensional Walsh coding to improve the robustness of watermarking in digital images is presented. The proposed technique inserts bits of binary handwritten signatures in the DCT blocks of a digital image. In the proposed method, the 1-D Walsh functions are used to encode the signature before being embedded in the cover image. The 1-D Walsh coding can...
Day to day growth of multimedia technology draws great attention for security. Digital images can be easily altered with software. This problems demand copyright protection and ownership verification. Digital watermarking is proposed as one of the ways to accomplish this, in which Digital watermarks are generally embedded into digital images in a manner that make the watermark invisible to a human...
Digital watermarking is an effective and popular technique for discouraging illegal copying and distribution of copyrighted digital image information. One of the important features of the watermarking technique is the robustness of the watermarked image, which will preserve the quality of the retrieved watermark. There are two parts about robust oblivious watermarking scheme based on the frequency...
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