基于自适应调节因子的水印算法  

A Watermarking Algorithm Based on Adaptive Modulation Factor

作　　者：王金伟[1] 戴跃伟[1] 王执铨[1] 

机构地区：[1]南京理工大学自动化系,南京210094

出　　处：《计算机工程与应用》2005年第2期26-29,124,共5页Computer Engineering and Applications

基　　金：国家自然科学基金项目;信息隐藏的优化模型及其应用研究(编号:60374066)

摘　　要：提出一种基于自适应调节因子的水印算法。此因子以量化基础上的中低频系数的个数为参数。并且按照统计的中低频系数的个数在非盲提取算法中将离散余弦变换(DCT)块分成两类并将水印以不同的强度嵌入。在盲提取算法中将水印嵌入低频系数中。实验证明该算法对JPEG压缩等攻击有强的鲁棒性。This paper proposes a watermarking algorithm based on the adaptive modulation factor in which the number of the quantized coefficients of low and middle frequency(QCFMF )is parameterized.And in the non-blind detection algo-rithm,the DCT blocks using the number of QCFMF are classified into two sorts where the watermark is embedded at different strengths.The watermark is embedded by modifying the coefficient of low frequency in the blind detection al-gorithm.The experiments prove that the algorithms are strongly robust against JPEG attack.

关 键 词：自适应 量化 中低频系数 调节因子 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]