High capacity reversible data hiding in encrypted image based on image encoding and POB

Abstract

Reversible data-hiding in encrypted image (RDH-EI) can be used for protection of original image by image owner; data hider can embed secret data in the encrypted image without necessity of knowing the original image content. In order to enhance the capacity of embedding in encrypted image, a novel RDH-EI framework based on JPEG-LS and permutation ordered binary (POB) number system is proposed. In the proposed scheme, the original image is first encoded by JPEG-LS, and then the encoded image is encrypted by bit planes. In the phase of data hiding, the encrypted image is first shuffled, and then non-encoded encrypted pixels are totally replaced by the secret data. Lastly, the above generated image is divided into some non-overlapping 2 × 2 blocks, the block feature of 3-bits which is calculated from the pixels within the block and 5-bits secret data are embedded into the every pixel of the block, and then the pixels with 10-bits data in the block are transformed into the POB value. Experimental results show that the proposed scheme obtains the higher embedding rate compared with some of the state-of-the-art schemes, the weak robustness and performance of verification for tampered parts in the marked image are also achieved for the proposed scheme.