摘要
提出一种基于压缩感知和非采样Contourlet变换的数字图像水印算法.首先使用NSCT变换对载体图像进行稀疏分解,对低频系数矩阵进行Arnold置乱;然后采用高斯观测矩阵对系数矩阵进行压缩感知测量,在感知域(压缩信号)中进行水印嵌入;最后使用OMP算法恢复重组的低频矩阵信号,使用NSCT逆变换重构图像.算法中,测量矩阵同时充当了密钥的作用,增强了算法的安全性,此外Arnold变换也增强了水印的不可见性和安全性.仿真实验证明,所提算法对加噪、滤波、旋转具有较高的鲁棒性.
This paper proposes a new algorithm based on Non-sampling Contourlet Transform (NSCT) and Compressed Sensing(CS) to improve the watermarking' s attack robustness.First,it uses NSCT to transform the image and scramble the low-frequency coe^cients by Arnold scrambling,then it uses the compressed sensing for the low -frequency matrix of scrambling the watermark embedded in the compressed signal ; it finally recovers the reorganization of the low-frequency matrix signal by OMP algorithm,and uses NSCT inverse transformation to reconstruct it.Experimental results show that the new algorithm has a high robustness in noise,filtering and rotation.
出处
《云南民族大学学报(自然科学版)》
CAS
2015年第1期48-51,共4页
Journal of Yunnan Minzu University:Natural Sciences Edition
基金
国家民委科研项目(12YNZ008)
云南省教育厅科学研究基金(2012Y315)