基于人类视觉系统和DCT中频水印算法

数字水印技术作为数字产品版权保护的一项新技术，已得到广泛的应用。一个适用的数字水印算法应该既能保证图像良好的可视性，又要具有很好的鲁棒性。而基于DCT域的数字水印技术已成为当前的一个研究热点。文中提出的算法是结合人类视觉系统（HVS）特性通过改变中频段DCT相邻系数实现水印的嵌入。实验结果表明，该算法具有很好的视觉效果，检测出的水印效果较好，对JPEG有损压缩、剪裁、噪声干扰、模糊等操作具有较强的鲁棒性。

A watermarking algorithm based on HVS and DCT

As a new technique to protect the ownership of digital productions,digital watermarking is applied widely.An useful digital watermark algorithm should be visually imperceptible and must be robust to resist(various) attacks.The digital watermarking technique based on DCT domain is a research hot.This paper presented (an algorithm) combining human vision system through changing DCT coefficients in middle frequency band to implement embedding watermark.The experimental result showed that this algorithm possessed of good visual effect and stronger robustness to JPEG loss compression,cropping,noise interference,fuzzy image and so on.