基于扩频CDMA的数字盲水印算法

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。丈中在引入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。

Blind Digital Watermarking Algorithm Based on Spread Spectrum CDMA

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.