基于小波融合和NPT的水印算法研究  

A Watermarking Algorithm Based on Naturalness Preserving Transform and Wavelet Image Fusion

作　　者：尚运[1] 顾济华[1] 黄北京[1] 

机构地区：[1]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《通信技术》2010年第7期80-83,共4页Communications Technology

摘　　要：利用自保留变换(NPT)的补偿与重构特性,提出了一种基于混沌置乱和小波图像融合的自保留变换鲁棒图像水印算法。首先利用Arnold混沌系统对水印图像进行置乱,然后利用NPT将水印图像嵌入到载体图像中,其中通过小波融合可以减小NPT变换引入的失真,再通过降噪预处理和迭代算法提取并检测水印。实验结果表明,该水印算法具有较强的安全性和视觉不可见性,对图像JPEG压缩、几何攻击和噪声表现出良好的鲁棒性。In the light of compensation and reconstruction for the Naturalness Preserving Transform（NPT）,a robust digital image watermarking algorithm based on chaos and wavelet image combination is proposed.The watermark image is first scrambled by Arnold chaotic system,and then embedded into the host image via NPT,and the artifacts caused by NPT watermarking algorithm could be reduced by wavelet image fusion.Watermark is detected and extracted through de-noise pre-processing and iterative algorithm.Experimental results show that the algorithm is of high security and good visual quality,and exhibits an excellent robustness against JPEG compression,geometric attacks and noises.

关 键 词：数字图像水印 NPT ARNOLD置乱 图像融合 鲁棒性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]