一种基于D-MR-DCT的彩色图像水印算法

提出一种基于D-MR-DCT域的彩色图像水印算法。算法首先选择彩色图像的绿色分量进行分块D-MR-DCT变换,提取每块四个子带的第一个系数组成新矩阵并对其进行D-MR-DCT变换,将经过置乱和分割的灰度水印的奇异值分别嵌入到D-MR-DCT变换得到的四个子带分解的奇异值中,经过相应的逆变换得到含水印图像。实验结果表明,算法提高了水印抗JPEG压缩的鲁棒性,并对添加噪声、几何剪切、图像缩放等具有良好的鲁棒性。

A Watermarking Algorithm based on D-MR-DCT for Color Image

A watermarking algorithm based on D-MR-DCT domain was proposed in this paper.Firstly,the green component of the original color image is divided into blocks and each block is transformed by using D-MR-DCT transform.Then,the first coefficient of each sub-band of each block is extracted to form a new matrix,the new matrix is transformed by using D-MR-DCT transform again and each sub-band is transformed by singular value decomposition.The singular values of gray watermark are embedded into the singular values of each sub-band of D-MR-DCT transform.The watermarked image is obtained through the inverse transform.Experimental results showed that the algorithm is robust against attacks such as JPEG compression,added noise,filtering,and so on.