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In recent years, invisible digital watermarks have been proposed as a method for protecting copyrighted materials such as digital images. Due to its characteristics, one of the problems in digital image watermarking is to decide which technique should be used to hide in an image as many bits of information as possible while ensuring that the embedded watermark can be correctly extracted at the detecting...
For many kings of watermarking in digital image, geometric attackers are their weakness. In this paper, we present a new digital watermarking algorithm based on special area invariability of image, the experimental result show that the algorithm is transparent, and it not only can well resist such geometrical attacks as translation and rotation, but also has strong robust to the common image processing,...
In most data-hiding schemes, the area of interest in the cover image cannot be protected from being modified. In this paper, we propose a data-hiding scheme in which the changeable and unchangeable pixels can be specified by the data-hider. To reduce the size of extra information, the location map used to depict the location information of changeable and unchangeable pixels is compressed by Run Length...
This paper proposes a watermarking embedding and extracting methods in the frequency domain based on a selection of a high frequency range containing large amount of information. The selected high-frequency range contributes to the imperceptibility of the watermark while the robustness against compression is achieved because the selected frequency range contains large amount of information. The entropy-based...
A major concern in wireless sensor networks is to maximize network lifetime while maintaining a high quality of service at each round, which includes target coverage and network connectivity. There are two competing objectives presented to determine where to place the sensor nodes, the coverage rate and the number of working nodes. And then a novel algorithm for selecting the optimal coverage set...
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