期刊论文

中文

计算机工程

1000-3428

2009

35

5

156-158

10.3969/j.issn.1000-3428.2009.05.054

(60373000):国家自然科学基金资助项目 (061018B,06Y003,07007A):中南林业科技大学青年科学基金资助项目

本校为第一机构

证明在离散余弦变换和小波变换中,图像经空域置乱前后在频域内不变的系数规律,根据构造的复合混沌迭代动力系统,提出2个利用不变频域变换系数规律的构造函数,生成复合混沌迭代动力系统需要的初始值,给出脆弱的图像自适应置乱算法以及相似度和抗攻击半径的置乱算法评价概念.实验表明,算法无需任何附加信息即可提取出原始阔像,对各种攻击十分敏感,平均抗攻击半径高于一般算法,适用于法庭、医学等要求极其严格的场合.

This paper proves invariable coefficient rule of the image in discrete cosine and wavelet transformation when it is scrambled in space domain. Based on the constructed composite chaotic iterative dynamic system, whose invariant distribution density is one, and in order to initialize composite chaotic iterative dynamic system, it puts forward two constructed functions using image scramble constant as input parameter. A fragile and adaptive image scrambling algorithm and two new scrambling evaluative parameters called similitude degree and anti-tamper radius are given. Experiments show that the ...