基于图像归一化的抗几何攻击水印技术

Digital watermarking robust to geometric distortions based on image normalization

在数字图像水印中,确保水印和图像的同步问题是水印图像有效抵抗几何攻击的关键。本文利用几何不变矩,对水印抗几何攻击进行了探讨,提出了一种基于几何不变矩的抗几何攻击的水印算法。通过对原始图像和攻击后的图像的归一化处理,使水印和图像在嵌入与提取过程保证同步。实验证明该方法对常见的几何攻击有很好的鲁棒性,嵌入的水印容量较大且水印图像的质量也较高。

In the watermarking field, how to keep watermark synchronized with original image in the embedding and detecting processes is a key problem to resisting geometric distortions. This paper proposes a method which makes full use of the geometric moments to normalize both the original image and the receive image,it can provide a synchronized environment for watermark embedding and detecting. Experimental results show that this algorithm has a good robustness to the normal geometric attack. In addition, this algorithm also improves the capacity of watermark and image quality.