基于Arnold置乱和脊波变换的数字水印算法

摘要

为了平衡数字图像水印的不可见性和鲁棒性,提出了一种基于Arnold置乱的脊波域数字水印算法.首先在利用Ar-nold变换对水印信息进行置乱处理,增强其保密性;然后利用脊波变换(Ridgelet transform)的方向敏感性和各项异性的特点,对载体图像进行分块脊波变换;最后将水印信息嵌入图像块的脊波域.实验证明本算法具有较好的不可见性,并且对载体图像进行加噪、JPEG压缩、滤波、剪切等的图像攻击具有较强的鲁棒性.%To redress the balance between the invisibility and robustness of the digital image watermark, a digital image watermark algorithm in ridgelet domain based on Arnold scrambling is presented. Firstly, Arnold transform is applied into watermark informa-tion to increase its privacy. Then a digital image with curvilinear edges or texture can be partitioned into small pieces and treated by ridgelet transform, according to the directional sensitivity and anisotropy of ridgelet transform. Eventually the watermark infor-mation is embedded in the ridgelet coefficients. The experiment results prove the robustness and transparency of the presented wa-termark algorithm against attacks such as adding noise,JPEG compression,filtering, shearing and other image manipulations.