关键词: 可逆数据隐藏, 块中值, 差值扩展, 可逆整数变换

Abstract: In the data hiding algorithm based on reversible integer transform, the traditional method obtains the values by calculating the differences between the upper left pixel and the remaining pixel of block. The proposed method obtains the values by using the median of a block instead of the upper left pixel, so that the stego image achieves lower distortion. Further, employing priority hidden data in the smooth regions can significantly improve the signal to noise ratio of stego image. It compares the similar reversible data hiding schemes, and the experimental results show that the proposed scheme achieves better visual quality with the same embedded capacity and demonstrate the effectiveness of the proposed algorithm.

Key words:  reversible data hiding, block median, difference expansion, reversible integer transform