Abstract: Since Bit-Plane Complexity Segmentation (BPCS) steganography is vulnerable to complex histogram attack, this paper proposed an improved algorithm based on preprocessing. The steganography derived compensatory rule from distribution of the cover image. Then it used reversed preprocessing in compensation to the change of complexity caused by embedded information. The experimental results show that the proposed algorithm can properly hide information and counteract the attack of complex histogram. The compensation happens before information hiding, so it can maintain the big capacity characteristic of the original algorithm.

Key words: information hiding, steganographic, Bit-Plane Complexity Segmentation (BPCS), preprocessing, histogram

摘要： 位平面复杂度分割(BPCS)隐写易受复杂度直方图攻击，为了弥补这一缺陷，提出了一种基于预处理的改进隐写算法。算法针对载密图像进行统计特征的量化分析，求导出逆向预处理的补偿规则，进而对嵌入信息引起的复杂度变化进行逆向的预处理补偿。实验结果表明，改进的算法在保证隐蔽性的同时具有很好的抗复杂度直方图攻击的能力，由于补偿过程是在隐藏秘密信息之前发生的，算法也较好地保持了BPCS大容量隐写的优点。

关键词: 信息隐藏, 隐写, 位平面复杂度分割, 预处理, 直方图