混合变换域数字水印在电力系统信息安全中的应用  

Application of Hybrid Transform Domain Digital Watermarking in Power System Information Security

作　　者：朱少敏[1] 张志强[1] 

机构地区：[1]国网北京市电力公司朝阳供电公司,北京100020

出　　处：《电信科学》2013年第11期82-86,共5页Telecommunications Science

摘　　要：随着电力行业信息化工程的不断推进,有效实现对电力生产、运行和管理过程中应用的大量图像、音视频、三维模型等多媒体信息的安全防护,正成为电力信息安全研究与发展中的热点和亟待解决的难题之一。提出了一种新的基于混合变换域的数字图像水印算法,二值水印图像嵌入宿主图像经混合变换后的低频子带中。结合低频子带能量分布与视觉掩蔽特性,自适应地确定量化步长,通过量化修改分块低频系数矩阵奇异值实现水印嵌入。实验结果表明,该水印算法具有较好的视觉保真度和较强的顽健性,将在电力系统信息安全领域发挥更加重要的作用。With the rapid development of electric, power information industry, a lot of multimedia products such as digital image, audio, video and three dimensional models were produced and applied during the electric power process of the production, operation and management. Therefore, how to realize digital media security effectively is becoming a challenging problem. A new image watermarking algorithm in hybrid transform domain was proposed. The secret watermark information bits were embedded into low frequency subband in hybrid transiorm. Aceording to energy distribution and visual masking in low frequency subband, the singular values of the selected low frequency subband blocks were adaptively applied quantization index modulation for embedding watermark information. Experimental results show that the algorithm has good image vision fidelity. The proposed digital watermarking is playing a more important role in network security for electric power system.

关 键 词：DWT—DCT 混合变换域 能量分布 视觉掩蔽特性 低频子带 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]