基于CDMA扩频的数字图像水印  

Digital image watermarking based on CDMA spread spectrum

作　　者：徐岩[1] 周激流[1] 何坤[1] 

机构地区：[1]四川大学计算机学院,成都610065

出　　处：《四川大学学报（自然科学版）》2008年第2期267-270,共4页Journal of Sichuan University(Natural Science Edition)

摘　　要：提出了基于CDMA原理的扩频数字图像水印的实现.对原始水印信息使用准正交的多个Gold序列将原始水印信息进行分组频谱扩展得到待嵌入的扩频水印序列,然后将该序列嵌入到载体图像DCT变换的中频系数.实验表明,该扩频水印实现方法不但具有良好的安全性,而且有较好的鲁棒性及不可见性,能够有效抵御多种水印攻击.This paper proposes an implementation of spread-spectrum digital image watermarking based on CDMA. The original watermark information is a binary image. With a set of orthogonal Gold sequences, the original watermark information is transformed into a spread-spectrum sequence, which is embedded into the mid-band DCT coefficients of the vector image. The experiment shows that this implementation has the advantage of high security, good robustness and invisibility, and can effectively withstand multiple attacks toward watermark.

关 键 词：CDMA 扩频 GOLD序列 水印攻击 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]