基于小波变换的双重水印算法研究  

The Study of Dual Watermarking Algorithm Based on Wavelet Transform

作　　者：朱玉[1] 

机构地区：[1]太原警官职业学院,山西太原030032

出　　处：《兰州工业学院学报》2015年第3期73-75,共3页Journal of Lanzhou Institute of Technology

摘　　要：数字图像水印在知识产权保护和认证方面已经成为一种重要的工具,提出了一种新的水印技术,在载体图像中嵌入两种类型的水印以达到版权保护和鲁棒性的目的.算法首先将PN序列的水印嵌入到主水印的小波域中,再将该水印嵌入到载体图像中.采用"Lena"图像作为载体图像,使用"太原警校"作为主水印图像,嵌入的PN序列可以通过与其他序列的相关性实现检测.为了测试算法的鲁棒性,对载体图像进行了压缩、滤波、噪声等多种类型的攻击.实验结果表明当载体图像遭到攻击时,水印信息仍然能够得到良好的检测.Digital image watermark has become an important tool in the intellectual property protection and au-thentication area recently. A new watermark technology is proposed in this paper that two types of watermark are embedded into the system to achieve the copyright protection and robustness. In this algorithm the primary water-mark is firstly embedded with the PN sequence in it’ s wavelet domain before it has been embedded in the host image. By using the Lena image as a host image and the “Taiyuan police academy” as the primary watermark. The embedded PN sequence was detectable through correlation of other sequences. Furthermore, in order to test the robustness, the watermarked image was exposed to compression, low pass filtering and noise attacks, and in all these cases, the secondary watermark was easy to detect even though the primary one was severely distorted.

关 键 词：数字水印 版权保护 离散小波变换 鲁棒性 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]