基于Arnold变换和沃尔什-哈达玛变换的彩色图像盲水印算法

Blind Watermarking Algorithm of Color Image Based on Arnold Transform and Walsh Hadamard Transform

针对数字水印系统需要兼容不可见性和鲁棒性的问题,提出一种基于Arnold变换和沃尔什-哈达玛变换(WHT)的彩色图像盲水印方案。将图像分为8×8不重叠的像素块,对彩色宿主图像进行沃尔什-哈达玛变换。为了增强水印的鲁棒性,水印图像在嵌入宿主图像前先利用Arnold变换进行置乱,然后将置乱后的水印图像的像素值转为二进制并嵌入WHT的变换矩阵中。实验结果表明,该算法具有较好的不可见性,在抗噪声、滤波、旋转等攻击方面均具有较好的鲁棒性。

Digital watermarking system needs to balance invisibility and robustness.In this paper,a blind watermarking scheme of color image based on Arnold transform and Walsh Hadamard transform(WHT)is proposed.The scheme divides the image into 8×8 non-overlapping pixel blocks and Walsh Hadamard transform the color host image.In order to enhance the robustness of the watermark,before embedding the watermark image into the host image,Arnold transform is used to scramble the watermark image,and then the pixel value of the scrambled watermark image is converted into binary and embedded into the transform matrix of WHT.Experimental results show that the proposed scheme has good invisibility and robustness against noise,cropping,filtering and other attacks.