基于DWT-SVD的彩色图像水印算法

本文根据奇异值分解理论把灰度水印嵌入到彩色图像的DWT分量中。为了既能保证算法的鲁棒性,又能够尽可能地提高不可见性,先将原图像分为RGB三个分量,将水印的信息添加到了RGB空间的B分量上,实验证明水印嵌入到蓝色分量比嵌入到其他颜色分量中可以更好地保持原始图像的感知质量。本文在提取水印时设定了阈值,如果奇异值分解对角线上的值低于这个阈值,就会用上面一行的值代替对角线上的值。实验证明,该方案对JPEG压缩和中值滤波等处理具有较好的鲁棒性。

Research on the ColorImage Watermarking Algorithm Based on SVD-DWT Domain

In this paper ,based on permuted image and SVD, we embedded gray watermark in colour image's dwt components. in order to make this algorithm is of better invisibility and very robust , The given color image is split into its three components RGB and a watermark was embedded into blue component of color image. It was found by experiment that the perceptive quality of original image might be better kept when watermark was embedded into blue component than into other color components.A Threshold value was setted,if the diagonal of valuebased on SVD was less than the threshold valve,we can substitute the value of before for the value of the diagonal .The experiments show that the algorithm had a better robustness to JPEG compressiing median filtering,and other attacks.