基于改进亚仿射变换的图像信息隐藏算法

为改进仿射变换的自身安全性，提出一种基于改进亚仿射变换的图像融合信息隐藏算法。通过改进的亚仿射变换对秘密信息图像做预处理，将密钥从6个提升到8个，并结合Logistic混沌序列利用图像融合技术完成秘密信息的嵌入。实验表明，该亚仿射变换有较好的置乱效果和安全级别，而Logistic混沌序列相比于传统隐藏算法中的混合因子具有更大的密钥空间，能提高图像隐藏的安全性。

Image Information Hiding Algorithm Based on Improved Sub-affine Transformation

An information hiding algorithm of image fusion technology is proposed based on the improved sub-affine transformation. This algorithm preprocesses the secret information image by using the improved sub-affine transformation, increases the key of the original algorithm from six to eight, and completes hiding secret information by using image fusion technology based on Logistic chaos sequences. Experimental results show that sub-affine transformation has good scrambling effect and safety level, and Logistic chaos sequence which enhances the security of image hiding compared with traditional hiding algorithm’s blend factors have larger space.