用于矢量数字地图的可逆数据隐藏算法  

Reversible data hiding algorithm for vector digital maps

作　　者：周璐[1] 胡永健[2] 曾华飞[1] 

机构地区：[1]华南理工大学自动化科学与工程学院,广州510641 [2]华南理工大学电子与信息学院,广州510641

出　　处：《计算机应用》2009年第4期990-993,共4页journal of Computer Applications

基　　金：国家自然科学基金资助项目(6077211560572140);广东省自然科学基金资助项目(04020004)

摘　　要：提出一种基于差值直方图的可逆数据隐藏算法,用于矢量地图的认证和隐秘通信。通过修改相邻顶点坐标的差值来实现数据隐藏。为减少由扩展嵌入所引起的图形失真,借助差值直方图来选取可嵌入差值,优先选择绝对值小的差值。与现有算法相比,本算法具有较高的嵌入率、较好的图形质量以及精确控制嵌入容量的能力。A difference histogram-based reversible data hiding algorithm was proposed for authentication and covert communications of vector maps. Each information bit was embedded by modifying the difference of two adjacent vertices. To decrease embedding distortion from difference expansion, a difference histogram-based selection scheme was introduced, which gave priority to the dift^rences with small magnitude. Compared with current algorithms, this algorithm has better embedding rate, better quality of the output image, and more accurate capacity control capability.

关 键 词：矢量地图 可逆数据隐藏 无损水印 差值扩展 差值直方图 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]