基于修改的Zernike矩的抗几何攻击的数字水印方法

利用图像Zernike矩的幅度具有旋转不变的性质,提出了一种抗几何攻击的图像盲水印算法.算法首先对载体图像进行分块,计算子图像的Zernike矩后将其进行正则化,对正则化后的Zernike矩进行筛选,根据水印信息对选中的Zernike矩进行修改,并对差矢量进行Zernike矩重构,通过将重构的图像在空域迭加到原始子图像中实现水印的嵌入.该算法在抽取水印时不需要原始载体图像和原始水印.实验结果表明,该算法能够抵抗旋转、缩放攻击、裁剪攻击、JPEG压缩、噪声、滤波等常规攻击.

Geometrically Robust Image Watermarking Using Modified Zernike Moments

A geometrically robust blind watermarking algorithm was proposed by using the rotation invariant property of Zernike moments.This arithmetic divided the carrier image into sub-images;then computed and normalized the Zernike moments of the sub-images.The normalized Zernike moments were selected to be modified according to the watermark bits.And the difference vector will be reconstructed and added to the cover image in spatial domain to obtain the watermarked image.This arithmetic can detect the digital wate...