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中文摘要：
为了实现对图像数据版权的有效保护,论文提出了一种新的基于子采样的混合变换域零水印算法。先将载体图像进行非下采样剪切波变换,变换后的低频分量经过子采样后得到4幅子图,然后对每一幅子图进行分块处理,最后通过比较两幅随机子图中规定映射位置上子块DCT变换后的直流分量的大小关系构造零水印。实验结果表明,该算法能够较稳健地抵抗添加噪声、JPEG压缩和剪切等多种常见的攻击操作,同时具有较高的安全性。
英文摘要：
A novel zero-watermark algorithm is proposed based on subsampling in hybrid transform domain for the copyright protection of image dates.In this method,the host image is performed with Non-Subsampled Shearlet Transform（NSST） firstly,and low-frequency component is divided into four sub-images by subsampling,then block processing is done to every sub-image.Finally,the zero-watermark is constructed by judging the numerical relationship between the DC coefficients of two special blocks from different sub-images randomly.Experimental results show that the method is very robust to common attack operations such as Adding noise,JPEG compression,Cropping and so on.
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