DCT域图像水印的局部优化检测性能研究  

Performance Analysis of DCT-Domain Watermark Detection Based on Local Optimum Detection

作　　者：孙中伟[1] 朱岩[1] 冯登国[1] 

机构地区：[1]中国科学院软件所信息安全国家重点实验室,北京100080

出　　处：《电子学报》2005年第5期864-867,共4页Acta Electronica Sinica

基　　金：国家973项目(No.G1999035802);国家自然科学基金(No.90304007);国家杰出青年科学基金(No.60025205)

摘　　要：　水印检测是数字水印技术最关键的步骤之一.水印检测的传统方法是采用线性相关的方法,但是该方法存在问题.本文根据数字图像离散余弦变换(DCT)域交流系数的广义高斯分布模型,对图像水印的局部优化检测方法进行了推导,并给出了水印检测器检测性能的理论分析结果.实验结果验证了图像水印局部优化检测方法检测性能理论分析的有效性,以及实际检测性能的优越性.Watermark detection is one of the most important steps in digital watermarking. It has traditionally been tackled using correlation-based techniques. However, correlation-based detection is not the optimum choice since it does not utilize the distributional characteristics of the host media. In this paper, by applying generalized Gaussian distributions to statistically model for the AC DCT coefficients of the original image, a DCT-domain watermark detection scheme based on local optimum detection is proposed. The performance of the new detector in terms of the associated probabilities of detection and false alarm is analyzed. The experimental results support the theoretical performance analysis, and confirm the superiority of the novel detector at the same time.

关 键 词：数字水印 广义高斯分布 局部优化检测 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]