关键词：数字水印；关系数据库；映射；比特流；医学影像
摘 要：With the widespread use of watermark in video,audio and image,propose a relational database based watermark embedding and extraction method.The algorithm utilizes the singlemultiple mapping approach to plug in watermark,which scatter the distribution of watermark information and enhance the anti-attack ability of the algorithm.The experiments show that the method enjoys strong robustness to such attacks as tuples resorting,subset selection and so on.