在结合现有的各种水印算法的基础上,提出了一种基于交叉里德索罗门码的数字水印方法,其主要思想是:在整体上利用大数选举对水印进行差错控制,在局部引入交叉里德索罗门码对水印信息进行纠错编码,使得水印信息对随机性和突发性错误具有很强的纠错能力。理论分析和实验结果表明,该算法对数据库影响很小,隐蔽性好,在提高水印鲁棒性的同时增加了数据库的水印可嵌入量,具有很好的应用价值。
Combined with the watermarking scheme in existence,a digital watermarking for relational databases based on cross Reed-Solomon codes is proposed.The basic idea of the method is to set up a model of error control which is based on majority voting and cross Reed-Solomon codes.Encoding makes watermarking capable of correcting stochastic and gusty errors.Theory analysis and experiment results show that the scheme is invisible and robust.It has a wide foreground in protecting the copyright of database.