基于DWT和SVD的数字水印算法

An Algorithm of Digital Watermarking Based on DWT and SVD

为了使水印算法具有更强的鲁棒性，提出一种基于离散小波变换（DWT）和奇异值分解（SVD）的数字水印算法．在水印嵌入之前首先对其进行调制。利用种子序列按照水印的大小生成一组随机数，并将这组随机数和原始水印图像进行调制．然后将调制后的水印嵌入到原始载体图像的离散小波域中。在水印提取时再利用调制过程的逆过程恢复出水印。实验结果证明了该方法对于JPEG压缩、噪声、旋转、剪切等具有很好的鲁棒性。

An algorithm of digital watermarking based on DWT and SVD is proposed to improve the robusmess of digital wartermarking. Before watermarking embedded into the host image, we first modulate it, that is to generate a group of random numbers according to the size of watermarking using the seed sequence and modulate them with the watermarking. Then the modulated watermarking is embedded into the DWT domain of host image. We get the extracted watermarking by the inverse course of the embedding. Experimental results have demonstrated that the proposed approach is robust against common signal processing such as JPEG compression, noise, rotation and cropping.