基于DCT域中频系数关系的冗余水印算法

The redundant watermark algorithm based On relationship of middle frequency coefficients in DCT domain

提出了一种在DCT变换域中嵌入冗余信息的算法.用不同的密钥对水印信息进行置乱,得到不同的冗余水印信息,增强了安全性.根据ZigZag的扫描顺序,在DCT域中选取一串中频系数并进行分组,嵌入冗余水印信息.对提取的冗余水印信息用最大隶属原则进行判决,确定嵌入的水印信息.实验验证该算法具有较好的抗噪声攻击和几何变换的能力.

The paper proposes a method that embeds redundant information in transform domain of DCT. To strengthen the security, it gets the different watermarking information from using different keys to disorder the watermarking. According to the scanning sequence of ZigZag, selecting a string of middle frequency coefficients and putting them in teams, the redundant watermark information is embedded in the teams. It determines the watermark depending on the maximum membership principle to judge the redundant information. It was proved that the algorithm was good at resistance to noises and geometric transformation.