抵抗几何攻击的数字图像水印技术的研究

数字水印技术是近年来提出的一种有效的数字产品版权保护技术。目前数字水印算法的抗攻击能力还不能完全达到应用的要求，几何变换攻击被认为是提高水印算法鲁棒性的关键问题。本文首先对数字水印攻击，几何变换攻击作用等方面进行了探讨，然后分析了当前图像水印抵抗几何攻击的各种策略，提出了下一步可能的发展方向。

Research on Digital Image Watermarking against Geometric Attacks

Digital watermarking technology is an effective way of copyright protection in recent years.At present,the ability of counteracting geometric attack hasn't completely achieved the request of application.The geometry transform attack is considered as a pivotal problem to improve the robustness of watermarking algorithm.In this paper the conception of wartermarking attack and the function of geometry transform attack are studied.Then the current methods against geometric attacks are analyzed and summarized,and some probable development directions of digital watermarking at next stage are introduced.