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This paper presents a reversible data hiding scheme. The proposed scheme is based on the pixel difference histogram shifting to spare space for data hiding. Pixel differences are generated between a center pixel and its neighbors in a pre-assigned block. A large number of pixel differences with equal values can be obtained which means more data can be embedded into the cover image than previous works based on histogram shifting. In addition, multi-layer embedding with various turns is used to increase the hiding capacity, and in each turn, the authors can offer high embedding capacity and keep low distortion by choosing the optimized block size and the best threshold.
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