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Suppose the cover JPEG image X consists of four DCT coefficients blocks, a simple example of the proposed scheme is shown in Fig. 3.The initial cost value C of the cover image can be computed, and the cover image is divided into four sub-images S 1, S 2, S 3, S 4.We first embed sub-messages into sub-image S 1 based on its cost values ρ +, ρ − that are equal to the initial cost value....

https://www.sciencedirect.com/science/article/pii/S0045790617302756

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