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。 Digital watermarking technology requires the construction of the algorithm, with strong robustness (anti-attack capability). Introduced the spread spectrum technology in the digital watermarking technology, has improved the robustness of the digital watermark, but reduced the embedded information amount at the same time. The introduction of CDMA technology in the article, to further enhance the robustness, but also to make embedded information has been increased. Simulation results show that the proposed algorithm is robust, transparent and has a low bit error rate. Under strong interference, the watermark can still be extracted.