计算机工程与应用 ›› 2008, Vol. 44 ›› Issue (19): 193-195.

• 图形、图像、模式识别 • 上一篇    下一篇

基于小波系数混沌调节的图像加密算法

何希平1,张琼华2   

  1. 1.重庆工商大学 计算机科学与信息工程学院,重庆 400067
    2.重庆工商大学 图书馆,重庆 400067
  • 收稿日期:2007-09-27 修回日期:2007-11-26 出版日期:2008-07-01 发布日期:2008-07-01
  • 通讯作者: 何希平

Image encryption based on chaotic adjustment of wavelet coefficient

HE Xi-ping1,ZHANG Qiong-hua2   

  1. 1.College of Computer Science and Information Engineering,Chongqing Technology and Business University,Chongqing 400067,China
    2.Library,Chongqing University,Chongqing 400067,China
  • Received:2007-09-27 Revised:2007-11-26 Online:2008-07-01 Published:2008-07-01
  • Contact: HE Xi-ping

摘要: 研究适用于JPEG2000标准的图像加密技术。首先给出了两个混沌映射,并分析了其统计特性;为实现基于质量可控的图像加密,构建了加密的视觉质量控制模型;在此基础上,通过对随机选取的最粗级小波近似系数进行深度可控的混沌调节,实现了图像加密;最后,对加密算法进行了有效性分析。用实验结果验证了该算法是可靠、安全、高效并对JPSEC是实用的。

关键词: 图像, 小波系数, 加密, 混沌调节

Abstract: This paper is aimming at the image encryption scheme applicable to JPEG2000 codec.Firstly,two chaotic maps are suggested and their statistic characteristics are also analyzed.Secondly,to accomplish a controllable visual effect of encrypted image,a visual quality control model is presented,and on the basis of which,a chaotic image encryption scheme is constructed by chaotically adjusting the randomly selected approximate coefficients at the coarsest level in wavelet domain.Then,the security and efficiency of the algorithm are analyzed.Finally,the experiment results illustrate that the proposed algorithms are credible,secure,efficient and practical for JPSEC.

Key words: image, wavelet coefficient, encryption, chaotic adjustment