基于扩频CDMA的数字盲水印算法

Blind Digital Watermarking Algorithm Based on Spread Spectrum CDMA

数字水印技术要求所构造的算法,具有很强的鲁棒性(抗攻击能力)。在数字水印技术中引入扩频技术,提高了数字水印的鲁棒性,但同时却使嵌入信息量减小了。文中在引入CDMA技术,进一步增强鲁棒性,同时也使嵌入的信息量得到了提高。仿真实验表明:所提出的算法具有很强的鲁棒性、透明性,而且误码率较小,在很强的干扰下,仍能提取出水印。

An algorithm as requested by digital watermarking has very strong anti-attack ability. Introducing the spread spectrum technology into digital watermarking has improved the ability of anti-attack, but reduces the volume of imbeded information. In this paper, the introduction of CDMA into digital watermarking has improved not only the ability of anti-attack, but also the volume of imbeded information. The experiment indicates that the algorithm is very strong in anti-attack ability, transparent, and small in BER. Even under very strong interference, it still can extract the watermarking.