一种改进的基于DWT的彩色图像水印算法

An Improved Color Image Watermark Algorithm Based on DWT

文章介绍了数字水印的相关概念,结合HVS提出了一种改进的基于DWT彩色图像水印算法。首先对水印图像进行置乱加密预处理,提高了算法的安全性。然后计算绿色分量的数量,与预先设定的阈值进行比较,根据其关系选择不同的嵌入方式,将不同的色彩分量嵌入到不同的频带中。实验表明该算法在无视觉失真的条件下可以保证较好的嵌入量,且能有效抵抗常见的攻击,具有较好的鲁棒性。

This paper introduced the concepts of digital watermark, and proposed a kind of DWT - based color image watermark algorithm combining with HVS. Firstly, we applied the pre - scrambling encryption to watermark image which enhanced algorithm＇s security. Then we calculated the amounts of green component, compared it with the pre - determined threshold and chose different embedding modes according to their relations. Different color components will be embeded into different frequency bands. Experiments showed that this algorithm ensured better embedded quantity under the condition of non - visual distortion, and resisted common attack and had better robustness.