A Multiple Image Based Reversible Data Hiding Scheme with High Embedding Capacity

In recent years, reversible data hiding methods using dual stego images have been proposed extensively. In order to embed more secret data, we proposed a reversible data hiding method that can embed secret data into M stego images, where M ≥ 2. The pixel in M stego images can be used to embed N secret bits. The embedding capacity becomes greater as N and M increase, where N means the number of bits embedded in a pixel. However, directly embedding N secret bits into one pixel always causes serious distortion. In order to avoid this issue, we proposed an effective and efficient method that can encode a set of N secret bits as one smaller decimal number. Embedding the decimal number into the pixel does not cause serious distortion, and our experimental results showed that the proposed method can embed more secret bits than other methods. For the same embedding rate, the proposed method provides better image quality than other methods. In addition, the execution time of the proposed method is less than that of other methods.