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Steganography has various useful applications. In this paper, a steganographic algorithm with high payload and low change rate is proposed. Three pixels are processed as a unit, the exclusive-or result of the second least significant bits (SLSBs) of the pixels in that unit is regarded as the flag. According to the value of the flag, as well as the Hamming distance between the least significant bits...
Due to its inherent limitations, the conventional quantisation index modulation (QIM) cannot be applied to reversible watermarking directly. An improvement is done in this work to QIM to make it suitable for reversible watermarking. Based on the improved QIM (IQIM), a reversible watermarking scheme for 2D engineering graphics is proposed. The relative amplitudes and relative phases of entity vertices...
A reversible (also called lossless, distortion-free, or invertible) visible watermarking scheme is proposed to satisfy the applications, in which 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 the host image through adaptively adjusting...
In this work, we propose a steganographic scheme based on an expandable progressive exponential clustering (EPEC) algorithm for embedding secret message in colour images, which aims to achieve high embedding capacity while keeping distortion low. The EPEC algorithm partitions the colour table into clusters of size equal to a power of 2 so that embeddable pixels can be used efficiently. Our experiments...
In this work, we propose a steganographic scheme for embedding secret message in VQ-compressed images, which aims to achieve high embedding capacity while keeping distortion low. To achieve these objectives, we develop a progressive exponential clustering (PEC) algorithm for partitioning the VQ codebook into a set of clusters. To embed the secret message based on the clustering, we substitute the...
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