预测滤波器在空域盲加性水印系统中的应用  

Prediction error filter applied in blind additive watermarking algorithm

作　　者：年桂君[1] 刘鸿石[2] 车晓镭[1] 孙晓颖[3] 

机构地区：[1]吉林大学物理学院,长春130012 [2]吉林大学仪器科学与电气工程学院,长春130026 [3]吉林大学通信工程学院,长春130022

出　　处：《吉林大学学报（工学版）》2011年第1期249-253,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(60940011);吉林大学科学前沿与交叉学科创新项目(421033311411)

摘　　要：为了提高空域图像水印算法的性能,提出将一种基于载体图像最小平方的预测滤波器用于空域加性水印的嵌入与检测。在嵌入端,用预测滤波器构造空域掩蔽函数,这种用预测残差作为控制嵌入强度的掩蔽函数与人类视觉的感知特性相吻合,在相同的视觉质量下大大提高了水印的嵌入强度。在水印检测时,为了有效抑制载体信号对相关检测器的干扰,采用预测滤波器对遭受攻击的水印作品进行预测滤波,得到的预测残差是对图像中水印信号的估计值,再与扩频序列共同送入相关检测器提取水印。实验证明,这种方法对一般信号处理及中轻度几何攻击具有较好的鲁棒性。In order to improve the performance of spatial image watermarking algorithm, a kind of prediction error filter based on cover image Least-Square （LS） was proposed, which is applied to the embedding and detecting processes. In the embedding process, the filter was used to produce a new spatial perceptual mask. The cover image prediction error sequence controls the watermark strength and matches well with the properties of human visual system. In the same visibility quality metrics, the scheme can embed more watermark strength. In the detection process, in order to reduce the cover image effect on the correlation detection, the LS prediction error filter was applied to the received image and estimation of the masked watermark. The normalized correlation measure for the resulting error sequence was computed. It is proved that the scheme is robust to general signal processing and geometric attacks.

关 键 词：信息处理技术 数字水印 掩蔽函数 预测滤波器 

分 类 号：TN918[电子电信—通信与信息系统]