常规的数字水印算法对几何攻击无能为力,水印算法对几何攻击的鲁棒性被认为是数字水印技术走上实际应用的一个关键点.文中通过对普通的基于几何不变性数字水印算法的分析,提出了一种彩色图像中基于几何不变性的数字水印的嵌入及检测过程,并通过一系列实验证明了该数字水印算法具有很高的抗几何攻击(旋转、缩放等)特性,即提高了鲁棒性.
Conventional digital watermarking algorithms are helpless in face of geometric attacks, the robustness to geometric attacks is called a bottleneck of the practical application of digital watermarking. By analysising the ordinary watermark algorithms, which is geometrical invariability, this article presents one watermarking method for the color images robust against geometrical attacks, and show that the propo'sed watermark has a high robustness against the geometrical attacks(rotation and resize etc)through a series of different experiments. It enhances the robustness.