一种基于小波变换与奇异分解的图像水印算法

提出一种基于离散小波变换(Discrete Wavelet Transform,DWT)与奇异值分解(Singular Value Decomposition,SVD)相结合的数字水印算法。该算法将原始图像的小波子图进行奇异值分解,将灰度水印图像进行Arnold变换以及扰乱加密,再进行分块离散余弦变换(Discrete Cosine Transform,DCT),将变换后的系数分类嵌入到相应的奇异值中。实验仿真表明,这种方法能抗大多数图像处理攻击,具有良好的鲁棒性。

A Digital Watermarking Technique Based on DWT and SVD

The paper proposes a new scheme of digital image watermarking based on the combination of DWT and SVD.The original image is decomposed with DWT into several subbands,and SVD is applied to transform the subbands.The gray-level watermark image is decomposed with blocked-DCT transform after being Arnold scrambled.Then DCT coefficients are classified and inserted into SVD of original image with different strength.The experimental results demonstrates the algorithm can keep good quality for watermarking image and has excellent robustness under the condition of the common image processing techniques.