基于RS纠错码和奇异值分解的多功能数字水印技术

Multi-functional digital watermarking technology based on RS error correction code and singular value decomposition

对基于RS纠错码和奇异值分解的多功能数字水印算法进行了研究。算法分为两个部分,版权保护算法和用户跟踪算法。多功能水印的版权保护算法利用RS纠错编码的特性,针对客户端与认证中心分别设计了水印提取算法,保证了两者不同的鲁棒性能要求。该算法在嵌入水印时,并不区分提取时的两种场景,使嵌入与提取时形成非对称,增强了保密性也简化了计算复杂度。多功能水印的用户跟踪算法采用奇异值量化和分组嵌入算法添加水印来实现高强度鲁棒性。实验结果表明:多功能水印嵌入后的图像PSNR值为47.96 dB,版权保护水印利用RS纠错码前后鲁棒性曲线明显不同,用户跟踪水印在受一般攻击的情况下仍能100%提取。

A kind of multi-functional digital watermarking technology based on RS error correction code and singular value decomposition is presented, which consists of copyright protection watermark algorithm and user tracking watermark algoritnm. Based on the characteristic of RS error correction code,the watermarking algorithm for copyright protection designs two different extracting methods for client and certificate authority to meet two different requirements of robustness. The algorithm of embedding watermark doesn＇t distinguish the two scenes, and produces an asymmetry in process of embedding and extracting, so this method can enhance protection performance and can reduce the computation complexity. The watermarking algorithm for user tracking uses a SVD quantization and grouped inserting watermark to improve robustness. Experimental results indicate that the PSNR of the watermarked image is 47.96 dB. The watermarking algorithm for copyright protection reaches the standard of strong robustness, and the watermarking algorithm for user tracking can achieve 100% extracting in certain attracting.