1、 摘摘 要要 目前，信息隐藏技术作为新型的信息安全技术受到了越来越多人的关注。由 于人的视觉敏感程度比较弱，所以图像文件是理想的信息隐藏载体。图像信息隐 藏技术主要分为空间域方法和频率变换域方法。本文分别从空间域和变换域两方 向研究不同算法，并加以实现。 本论文首先介绍了图像信息隐藏技术中用到的一些基本概念和基本模型；接 着介绍了空间域 LSB、LHA 和变换域 DCT、DWT 算法；然后对不同算法的性能 进行了分析与讨论；最后，在 Matlab R2009a 软件下实现了相应的算法。实现结果 表明，基于空间域方法具有较大的信息隐藏量和不可见性，但鲁棒性较差；而基 于变换域方法具有较强的不可见
2、性和鲁棒性，但信息隐藏量相对较小。 关键词关键词：LSB；LHA；DCT；DWT；信息隐藏量；不可见性；鲁棒性 ABSTRACT At present, the information hiding as a new information security technology is attracting more and more peoples attention. As the human visual sensitivity is relatively weak, so the image file is an ideal carrier of information hiding.
3、 Image information hiding techniques are divided into spatial domain methods and frequency transform domain methods. This paper researches spatial domain and frequency transform domain algorithms ,finally realizes and verifies the algorithms using Matlab R2009a. First, some basic concepts and the ba
4、sic model used in information hiding technology are introduced in this paper. Then spatial domain algorithms LSB, LHA and transform domain algorithms DCT, DWT are introduced. The performance and effectiveness of these algorithms were also discussed in the paper. Finally, the algorithms are realized using Matlab R2009a . Implementation results show that the spatial domain methods have large information hiding capacity and invisibility, but less robustness. The frequency transform domain method
