基于迭代函数系统和编码空间的数字图像置乱方法研究

针对数字图像的安全保密问题 ,本文介绍了一种基于位置空间的数字图像置乱技术 .首先利用伴随于迭代函数系统 ( IFS)的编码空间对数字图像各像素赋予不同编码 ,然后通过对编码的特定置换使各像素位置改变以达到图像置乱的目的 .本文讨论了置乱变换对原图信息分散的规律以及变换的周期性 .理论和实践表明 ,该方法克服了图像信息量大造成的编码上的困难 ,置乱变换后原图的信息按照特定的规律分散开 ,增强了信息隐藏的不可感知性 .

Scrambling Research of Digital Image Based on IFS and Code Space

Be aim at the security of digital image, we introduce a kind of digital image scrambling schemes based on position space. At first, we encode the digital image pixels taken advantage of the code space, which is produced by some IFS (Iterated Function System). Then change the pixels′ addresses according to transforming the codes, such that the image is scrambled. In this paper, we discuss the regular of the scattered information of image under the transformations and the transformations′ periodicity. Experiment results show that this scheme conquers the difficulty in coding, which is caused by amount of information of digital image. The information of image is scattered regularly through the scrambling transformation, enhancing the imperceptibility of information hiding.