一种置换DCT域中频系数的盲水印算法  

Blind Watermark Scheme Replacing Middle Frequency Coefficients in DCT Domain

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,江苏南京210094

出　　处：《南京理工大学学报（社会科学版）》2005年第S1期15-19,共5页Journal of Nanjing University of Science and Technology：Social Sciences

基　　金：国家自然科学基金(60374066);博士点基金(20020288052);江苏省自然科学基金(BK2002101)

摘　　要：该文提出的置换DCT域中频系数的盲水印算法不仅突破了传统的水印嵌入公式,如加性算法,而且很好地解决了被提取水印中含有原始图像DCT系数,从而影响检测准确性的问题,并给出了验证。为了满足鲁棒性和不可感知性之间的平衡,使用人类视觉模型自适应地调节水印的嵌入强度。实验证明,该方案不仅对信号处理攻击有强的鲁棒性,而且对几何攻击也具有一定的鲁棒性。A blind watermark scheme replacing the coefficients of middle frequency in DCT domain is proposed.The embedding rule of the scheme breaks through the traditional ones,such as additive rule,which solves the problem that the detection accuracy becomes low owing to the interference of the DCT coefficients of the original image in watermark detection.To satisfy the balance between the robustness and the imperceptivity,the HVS model is used to adaptively adjust the watermark embedding strength.In watermark detection,the similarity formula defined by Cox is used to implement the blind detection.The experimental results show that the scheme is robust against the signal processing attacks and the geometrical attacks.

关 键 词：置换 中频 盲检测 数字水印 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]