一种基于位置图的可逆水印方案  

Algorithm for reversible watermarking based on location map

作　　者：王继军[1] 

机构地区：[1]广西财经学院信息与统计学院,南宁530003

出　　处：《计算机工程与应用》2013年第4期87-90,共4页Computer Engineering and Applications

基　　金：广西教育厅项目(No.201106LX485);广西财经学院校级课题(No.2011A04)

摘　　要：提出一种基于位置图的可逆水印算法,选取载体图像的低位平面值作为水印嵌入位置,将载体图像分块,根据分块中低位平面像素值的大小关系将其分成三种不同类型的组,并用变长编码方式对组别进行算术编码,经逐组顺次判断便形成位置图编码,根据位置图信息,将位置图编码、水印信息、位置图所占用像素的LSB全部嵌入载体图像的低位,形成加密图像;提取时,先获取位置图,然后根据位置图无损提取水印,无损还原载体图像。算法具有可逆性和可多重嵌入性,安全性高、隐蔽性好、适用性强。This paper presents an algorithm for reversible watermarking based on location map. lne nost image is divided into blocks, then make sure the kind of every block according to the data magnitude, after that location map and its coding are pro- duced. The watermarking is embedded according to location map and mixed embedding method. Theory and experimental result indicates that this method can meet the different needs by selecting the appropriate parameter. Theoretical analysis and experi- mental results show that the algorithm is reversible and effective and secure.

关 键 词：可逆水印 位置图 无损数据嵌入 信息隐藏 最低有效位 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]