强鲁棒零水印技术

A Zero-Watermark Technology with Strong Robustness

为了提高鲁棒水印技术的鲁棒性,提出一种基于离散小波变换(DWT)和奇异值分解(SVD)的零水印技术.首先对原始载体图像进行离散小波变换,然后选择低频子带进行分块奇异值分解,最后通过判断每个子块最大奇异值的最高位数字奇偶性产生鲁棒零水印.实验结果表明,零水印技术对各种攻击具备很强的鲁棒性.

In order to enhance the robustness of roust watermark technology,a zero-watermark technology is proposed based on discrete wavelet transformation（DWT） and singular value decomposition（SVD）.It conducts DWT with the original image,divides its low frequency band into blocks,and conducts SVD with every block.Zero-watermark is derived by judging the parity of the first digit of the biggest singular value in every block.Experiments show that it possesses strong robustness against various attacks.