一种DCT域高容量的抗压缩信息隐藏算法

A high capacity data hiding algorithm against compression on DCT-domain

空域算法和频域算法是目前信息隐藏技术使用的两种主要方法,其存在的问题是空域算法鲁棒性较差而频域算法的嵌入容量较小。文中针对频域问题,通过设置多个分块DCT系数值的排序来映射0、1码,实现在每个分块内隐藏4比特信息。仿真结果表明,本算法可实现较高的信息隐藏容量,含密图像可以盲提取秘密信息,并通过隐藏位置置零更好地恢复载体图像。含密图像经过JPEG2000四倍压缩后,可以正确提取秘密信息,即算法具有一定的抗压缩性能。

Abstract： The spatial algorithm and the frequency domain algorithm are the two main methods used in information hiding technology nowadays, and the problems are the poor robustness in spatial algorithm and low capacity in frequency domain algorithm. In this paper, we focus on the problem in frequency domain, set the sequences of several coefficient values in block DCT to map the 0,1 code, and the 4-bits of information hiding capacity in each block can be achieved. The experiment results indicate that this method can improve the hiding capacity, blind pick up the secret information and recover the cover image better by setting hiding bits zero. The secret information can be extracted with little distortion after Stego-image goes through four times of the JPEG2000 compression, that is to say, this method has a certain anti-compression performance.