半空间混合图像置乱方法  

A Scrambling Scheme of Image Based on Semi-space Domain

作　　者：李涛[1] 田岩[2] 张剑[1] 刘阿军[2] 

机构地区：[1]湖南科技大学信息与电气工程学院 [2]华中科技大学电子与信息工程系,湖北武汉430074

出　　处：《计算机应用研究》2006年第3期172-174,共3页Application Research of Computers

摘　　要：考虑到变换域置乱的鲁棒性和混沌序列对初值敏感、遍历性及随机性等特点,提出一种基于DCT变换域的半空间图像置乱方法,先对图像的第一个变量进行一维DCT变换。在此基础上对DCT系数用混沌序列进行调制,将调制结果进行DCT反变换;进而对图像的第二变量进行一维DCT变换,采用与第一变量相同的方法得到最终的置乱结果。算法简单可行,置乱效果好。实验证明该方法具有一定的抗攻击能力。Due to the good properties of chaotic sequences including their sensitive dependence on initial value, pseudorandom, ergodic, an image scrambling method, called semi-space domain, based on two times 1-D DCT and chaos maps is presented in this paper. The procedure of the algorithm is mainly divided into two steps：first, an original image is decomposed for its first variable by 1-D DCT, then by chaos system, a scrambling result is achieved. After by inverse 1-D DCT for the scrambling result, repeating the same procedure for the second variable ,the final scrambling result is obtained. At the last part of this paper, the experimental studies are carried out on certain standard test images. The experimental results show that the new method is effectiveness.

关 键 词：信息隐藏 图像置乱 DCT变换 混沌序列 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构] TP391[自动化与计算机技术—计算机科学与技术]