基于Lorenz混沌加密的彩色图像水印算法  

COLOUR IMAGE WATERMARKING ALGORITHM BASED ON LORENZ CHAOS ENCRYPTION

作　　者：叶菲[1] 罗景青[1] 

机构地区：[1]解放军电子工程学院,安徽合肥230037

出　　处：《计算机应用与软件》2008年第12期278-280,共3页Computer Applications and Software

摘　　要：数字水印技术可以有效地保护数字产品的版权,维护数据安全。现有的数字水印方法大多针对灰度图像,而较少研究彩色图像。但是与灰度水印相比,彩色水印含有更多的信息。因此根据人类视觉系统对蓝色最不敏感的特性,提出一种基于混沌加密的彩色图像数字水印算法。该算法利用Lorenz混沌系统加密的优点,首先由Lorenz混沌系统产生数字水印嵌入的位置,再将数字水印嵌入到彩色图像该位置对应像素的蓝色成分中,并在已知密钥的条件下,可对嵌入的水印进行有效地提取。最后的仿真结果表明,该算法嵌入的数字水印同时满足稳健性和不可见性的要求。Digital watermark technique is effective in protecting copyright of digital products and maintaining data security. Existing digital watermarking algorithms are mostly designed against gray images but few are for the colour images. And colour watermark comprises more information compared with the gray watermark. According to the characteristics of human vision system （ HVS）, human eyes are most insensitive to blue, so a colour image watermarking algorithm based on chaos encryption is proposed. The algorithm makes use of the advantages of Lorenz chaos system encryption, firstly it uses Lorenz chaos system to create the position the digital watermark is to be embedded, then embeds the digital watermark into the blue component of the corresponding pixels in the colour image. And under the condition of knowing the secret key, the algorithm can extract the embedded watermark effectively. In the end of the paper, the simulation results indicate that the digital watermark embedded by this algorithm can satisfy the requirements of robustness and invisibility at the same time.

关 键 词：数字水印 LORENZ混沌系统 彩色图像 人类视觉系统 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN918[自动化与计算机技术—计算机科学与技术]