基于直方图和HVS特性的混沌加密信息隐藏技术研究

Study of chaos encrypted information hiding technology based on histogram and HVS property

该文提出了一种基于直方图和HVS视觉特性的混沌加密信息隐藏算法,并给出了算法的详细实现方案.根据HVS(人眼视觉系统)视觉特性,人眼对低灰度区和高灰度区的敏感度较差,对中灰度区的敏感度较好.因此,本算法利用图像直方图中低灰度值区和高灰度值区的多个概率最大点来隐藏信息;并首先利用混沌系统Logistic映射产生的位序列对待隐藏信息进行加密以增加秘密信息的安全性.试验结果表明该方法不仅可以进行较大容量的信息隐藏,而且还有较好的隐藏效果.

A chaos encrypted data hiding algorithm is proposed based on histogram and HVS visual property. A detailed realization is also given for the algorithm. According to HVS （Human Visual System） visual property, human eyes are more sensitive to the middle grayscales than to both the higher grayscales and the lower grayscales of an image. Thus this algorithm utilizes some grayscales with the maximum probabilities in the high grayscale area and the low grayscales area of the histogram of the image to hide information; and firstly, encrypt the secret information by bit sequence which the chaos system Logistic mapping produces in order to increase the security of the secret information. Experimental results show that the algorithm can increase the information hiding capacity and visual effect.