一种新的基于复合变换域灰度数字水印算法

A Novel Gray Digital Watermark Algorithm Based on the Multi-Approach Transform Domain

文章提出了一种新的结合Arnold置乱变换的复合变换域灰度数字水印嵌入算法。该算法利用系数间的相关性对原始图像离散小波变换后的低频系数LL进行离散余弦变换,然后在其中嵌入水印,在嵌入水印之前对Arnold变换预处理的灰度水印图像作离散余弦变换,这样增强了水印的鲁棒性和不可见性。实验结果证明,该算法能有效抵抗JPEG图像压缩和常见的图像处理操作攻击。

A novel Multi-Approach transform domain gray watermark embedding algorithm combining Arnold Transform is presented in this paper. Owing to the correlations between the coefficients, the low-frequency coefficients LL used by DWT of the original image are transformed to DCT coefficients. Before being embedded, watermark image by Arnold transform is then transformed to DCT coefficients to enhance robustness of the approach and its imperceptibility. The experiment results indicates that the method could resist some typical watermarking attacks such as JPEG compressing and so on.