摘要
利用脊波变换具有多方向性和各向异性的特点,提出了一种乘性图像水印算法.在水印嵌入过程中,以中频脊波子带作为水印嵌入空间平衡水印的不可感知性和鲁棒性.在水印检测过程中,采用广义高斯分布来刻画脊波系数的统计分布特性,并通过奈曼皮尔逊准则确定水印系统的检测阈值,给出了水印系统的虚警概率和检测概率之间的工作特性曲线关系.最后通过实验测试了该算法在抗压缩、叠加噪声、缩放、剪切等攻击时的鲁棒性能.仿真结果表明,该算法具有较好的透明性和较强抵抗常用图像处理及几何攻击的能力.
A multipllicative image watermarking is proposed by taking advantages of the ridgelet trans-form in this paper.The middle-frequency rideglet wavelet subband is selected as the watermark embedding space.In the detection scheme,the probability density function of ridgelet coefficients is modeled by the generalized Gaussian distribution model,and the watermark decision threshold is obtained by using the Neyman-Pearson （NP）criterion,and the Receiver Operating Characteristic （ROC）curve between the probability of false alarm and the probability of detection is exploited.Finally,the robustness of proposed watermarking is tested when against common image processing attacks such as JPEG compression,additive white Gaussian noise （AWGN ）,scaling and cropping,etc.Experimental results demonstrate that the proposed method has good transparency and good robustness.
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
北大核心
2015年第4期528-532,共5页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
江西省教育厅教研课题项目(JXJG-13-60-2)
关键词
图像水印
广义高斯分布模型
脊波变换
乘性嵌入
工作特性曲线
image watermarking
generalized Gaussian distribution model
ridgelet transform
multi-plicative embeddding
receiver operating characteristic
