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A reversible (also called lossless, distortion-free, or invertible) visible watermarking scheme is proposed to satisfy the applications, where the visible watermark is expected to combat copyright piracy, but can be removed to losslessly recover the original image. We transparently reveal the watermark image by overlapping it on a user-specified region of(More)
Many existing steganographic methods hide more secret data into edged areas than smooth areas in the host image, which does not differentiate textures from edges and causes serious degradation in actual edge areas. To avoid abrupt changes in image edge areas, as well as to achieve better quality of the stego-image, a novel image data hiding technique by(More)
Since the data of wireless sensor networks play an important role in the communication, many strategies have been devised to protect the security of sensor networks. Due to the importance of copyright protection for valuable sensor data, we present a robust watermark algorithm as the solution in this paper. We make use of the numerical characteristic of(More)
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract—Due to the increasing popularity of cloud computing, more and more data owners are motivated to outsource their data to cloud servers for great convenience and reduced cost in data(More)
This paper models the messages embedded by spatial least significant bit (LSB) matching as independent noises to the cover image, and reveals that the histogram of the differences between pixel gray values is smoothed by the stego bits despite a large distance between the pixels. Using the characteristic function of difference histogram (DHCF), we prove(More)