基于Contourlet变换和DCT量化的零水印算法

摘要

An image zero-watermarking method based on Contourlet transform and DCT quantization is proposed in this paper. After the transformation of Contourlet to original image, constructed image is obtained by a certain calculation of blocked DCT quantization values of low-frequency sub component and the scrambled watermark image. Then, the secret image is generated. The watermark image can be extracted from the secret image. Experimental results show that this algorithm is simple, invisible and robust%提出一种基于Contourlet变换和DCT量化的数字图像零水印算法.对原始载体图像进行Contourlet变换,对其低频逼近子图进行分块DCT变换,并将系数值的量化结果和置乱后的水印图像进行一定运算得到构造图像,再加密成密钥图像.密钥图像被用来提取水印.实验仿真结果表明,该算法比较简单,不可觉察性很好,有较强的鲁棒性.