Abstract
A turtle shell (TS) based reversible data hiding (RDH) scheme with two-dimensional histogram shifting (HS) is proposed. The proposed scheme extends the embeddable set from a peak point in HS scheme to a two-dimensional region, so as to improve the embedding capacity (EC). Firstly, a threshold T is used to divide the pixel-pairs into three groups: left-shifting set without embedding (LSS), right-shifting set without embedding (RSS), and embeddable set (ES). Secondly, pixel-pairs in sets LSS and RSS are shifted outward to vacate room for embedding. Lastly, secret data are embedded into pixel-pairs in set ES. After that, the embedded data can be extracted accurately and the cover image can be recovered losslessly. Furthermore, various requirements of EC can be obtained by adjusting the threshold T. Experimental results verify that this paper can achieve a higher EC than the existing pairwise based schemes while maintaining an acceptable image quality.
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