Abstract
Reversible data hiding in encrypted image (RDHEI) is a technique that can provide the security and invisibility of their own information during the acquisition and sharing of them among multi-users. Among which, parametric binary tree labelling (PBTL) is a novel technique designed to serve for high-capacity RDHEI. However, considering the local smoothness of the image, its potential redundancy room has not been fully explored. In this paper, we propose an improved PBTL-RDHEI scheme (IPBTL-RDHEI in short). In IPBTL-RDHEI, an adjusting pixel modulation strategy is considered to reduce the probability of the overflow of pixels, making more embeddable pixels usage to carry secret data. Moreover, a blockwise rearrangement and compression (BRC) mechanism is introduced to decrease the length of the required auxiliary information. Experimental results confirm that the proposed scheme is able to achieve an average embedding rate as large as 1.827 bpp when the block size is set to 3×3.
Highlights
Reversible data hiding (RDH) is a technique that has been designed to work on embedding secret data by slightly modifying the contents of the image, and it is able to recover the original image losslessly after the removal of those secret data
We propose an effective Reversible data hiding in encrypted image (RDHEI) scheme in this paper based on parametric binary tree labelling (PBTL)
EXPERIMENTAL RESULTS In order to demonstrate the effectiveness of our approach, experiments and comparisons are performed for PBTLRDHEI, IPBTL-RDHEI and the other schemes [19], [20], [23]
Summary
Reversible data hiding (RDH) is a technique that has been designed to work on embedding secret data by slightly modifying the contents of the image, and it is able to recover the original image losslessly after the removal of those secret data. In 2019, Chen and Chang [25] proposed a VRSE based RDHEI scheme Before image encryption, they vacated spare room from MSB planes of the original image using the joint technique, which combines the run-length encoding and the block-wise MSB plane rearrangement method. An improved sparse matrix encoding for different types of binary block within LSB of encrypted image was designed to vacate spare room to carry secret data. Their scheme allows the recipient to extract the secret data and recover the original image from the marked encrypted image.
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