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Extended Exploiting-Modification-Direction Data Hiding with High Capacity

Data hiding is referred as a famous and effective technique for delivering secret message securely, in which the secret message is concealed in a cover medium during transmission. At present, reference matrix is extensively applied to data hiding, but the embedding capacity of existing reference matrix based data hiding schemes is limited. In this paper, we propose an extended exploiting-modification-direction (EMD) data hiding scheme to enhance the embedding capacity. An extended EMD reference matrix is established to guide the hiding procedure such that the embedding capacity can achieve as large as 2.5 bpp. Experimental results reveal that the proposed scheme maintains better embedding capacity than some state-of-the-art schemes while keeping great image quality.