摘要： 数字图像的置乱技术是图像信息隐藏和伪装的重要的手段之一。该文基于经典的Vigenère密码理论，提出一种数字图像灰度置乱方法，给出利用这种方法进行数字图像置乱的算法流程。仿真实验及结果表明，经这种方法置乱后的图像直方图与白噪声图像的直方图相似度约为0.9，从而验证了该方法的有效性。通过对安全性能的讨论，以及与改进Grey编码进行灰度置乱方法的结果进行比较，证明该方法具有较好的实用性。

关键词: 数字图像置乱, 灰度置乱, Vigenère密码

Abstract: Digital image scrambling is one of the most important methods of image information hiding and camouflage. This paper proposes a digital image grey level scrambling algorithm based on the classical Vigenère coding theory, and presents the detailed process of this algorithm. The analysis of the simulation shows the validity of the algorithm: the similarity degree between the result’s histogram and white noise image’s is almost 0.9. By discussing the security and compared with the results of advanced grey code transformation, the proposed algorithm is proved of better practicability.

Key words: digital image scrambling, grey level scrambling, Vigenère code

中图分类号: 

• TP309