基于非下采样Contourlet变换的伪Zernike矩水印算法研究  

ON WATERMARKING ALGORITHM OF PSEUDO-ZERNIKE MOMENTS BASED ON NON-SUBSAMPLED CONTOURLET TRANSFORM

作　　者：王向阳[1,2] 朱丹丹[1] 

机构地区：[1]辽宁师范大学计算机与信息技术学院,辽宁大连116029 [2]北京大学视觉与听觉信息处理国家重点实验室,北京100871

出　　处：《计算机应用与软件》2011年第5期278-280,295,共4页Computer Applications and Software

摘　　要：方案以非下采样Contourlet变换及伪Zernike矩知识为基础,利用非下采样Contourlet变换提取出低频区域,在此区域采用量化调制伪Zernike矩的幅值将水印信息嵌入。由于非下采样Contourlet变化有很好的平移不变性和抗噪性,而伪Zernike矩具有旋转不变性,还具有对噪声不敏感的特性,两者结合是一个较好的抗几何攻击方法。仿真实验表明,该算法不仅具有较好的透明性,而且对常规信号处理和一般性几何攻均具有较好的鲁棒性。The scheme presented in this paper is based on non-subsampled Contourlet transform theory and pseudo-Zernike moments knowledge.It uses non-subsampled Contourlet transform to extract low frequency sub-band,and the digital watermark information is embedded into this sub-band by quantizing the magnitudes of the selected pseudo-Zernike moments.Non-subsampled Contourlet transform has good translation invariant and noise resistance,and pseudo-Zernike moments have good rotate invariant as well as the property of insensitive to noise,therefore to combine these two together is a quite good method to resist geometric attack.Experimental results also show that the proposed scheme is preferably transparent,moreover,it is robust against the common signals processing and is robust against usual geometric attacks as well.

关 键 词：图像水印 几何攻击 非下采样CONTOURLET变换 伪ZERNIKE矩 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]