一种自适应盲灰度水印算法

本文提出了一种基于余数条件稳定性的自适应盲水印算法，并将DC和AC系数结合进行水印的嵌入。使用余数设置的方法在四个系数中嵌入水印，将它们的余数关联起来。并利用视觉掩蔽效应自适应地选择嵌入强度，使得不可见性和鲁棒性得到很好的折中。通过对系数的重组，对灰度水印权值较高的位（高平面位）进行重点保护，使提取的水印质量得以提高。改进了通常在DC系数中嵌入水印是非盲算法和嵌入容量较小的缺陷，同时避免了DC系数改变过大引起的块效应。实验证明该算法取得了很好的效果。

An adaptive blind digital watermarking algorithm

This paper provides an adaptive blind digital watermarking algorithm based on the stability of remainder, and combines DC and AC coefficient to embed. It embeds 1-bit watermark into 4 coefficients by setting remainder, and connects the 4 coefficients. Using HVS to choose the adaptive strength of embedding, it has a better invisibility and robustness. This algorithm protects the bit which has bigger power by resetting the coefficients matrix to get better quality of extracted watermark. It improves the blemish which is not blind and has a small embedding capability, at the same time it keeps from the block effect which is brought by changing DC coefficients too much. The experimental result has proved that this algorithm has a good effect.