Abstract: This paper proposes a novel block-based dada hiding method which is optimized by the genetic algorithm. First, the chaotic map permutes the order of the bits of the data before they are hidden into the binary image. Then, the genetic algorithm is introduced to find a good parameter of the chaotic map so as to obtain a better consistency between the order of the bits and the character of the blocks. By this scheme, the number of flipped pixels can be reduced. As a result, the visual quality of the binary image can be improved. Moreover, the parameter can demonstrate the performance of the proposed method.

Key words: Data hiding; Binary image; Chaotic map; Genetic algorithm

摘要： 提出了一种新的基于块的二值图像信息隐藏方法，该方法用遗传算法进行优化。首先用混沌映射置乱欲隐藏信息的比特顺序，然后用遗传算法来寻找一个较好的系统参数，使之确定的比特顺序与块的特征具有较好的一致性。从而减少要取反的像素个数，提高图像的视觉质量。另外，该参数也是提取信息比特的密钥，增强了所隐藏信息的安全性。实验结果证实了该方法的有效性。

关键词: 信息隐藏；二值图像；混沌映射；遗传算法