基于离散小波—奇异值分解的多水印嵌入算法

为提高传统数字图像水印算法的安全性, 解决数字水印对信号处理和几何失真比较敏感的问题, 提出一种新的以离散小波多级分解与奇异值分解相结合的数字图像水印算法. 不同于常见的基于小波变换的数字水印技术, 该方案在原始图像离散小波变换的低频近似区域和高频对角区域中嵌入水印, 在图像的保真度和鲁棒性之间取得较好的折衷. 水印检测时, 将从低频近似区域和高频对角区域中提取出的水印进行比较, 选择效果较好的水印作为最终检测水印. 实验结果表明, 提出的多水印算法对于各种攻击具有较强的鲁棒性.

Multiple Watermarking Scheme Based on the DWT—SVD

In order to improve the security of traditional digital image watermarking algorithm, and solve the problem of digital watermark is sensitive to signal processing and geometric distortion. A new digital watermarking algorithm combined with singular value decomposition and wavelet transform is proposed. Unlike the common wavelet based watermarking techniques, the proposed scheme lies essentially on marking the approximation and diagonal bands of the discrete wavelet transform (DWT) of the cover image achieving a better compromise between fidelity and robustness. The examination algorithm of watermark used the double watermark comparison examination. Experiments show that our contributions provide the multiple watermarking schemes with robustness to a wide variety of attacks.