改进的大容量可逆数字水印嵌入算法  

Improved Large Capacity Reversible Digital Watermark Embedding Algorithm

作　　者：吕林涛[1] 张玺[1] 

机构地区：[1]西安理工大学计算机科学与工程学院,西安710048

出　　处：《计算机工程》2011年第22期107-109,共3页Computer Engineering

基　　金：陕西省自然科学研究计划基金资助项目(2010JK740)

摘　　要：针对现有的差扩算法位置图难以压缩的问题,提出一种采用奇偶不变特性、和値不变特性、差值调节和块差扩相融合的可逆水印改进嵌入算法。该算法对宿主图像实施2×2的像素分块,采用横向扫描与纵向扫描相融合的方式嵌入水印。实验结果证明,该算法提高了可逆水印的嵌入容量,仅产生1/4宿主图像大小的位置图,具有较高的实用价值。To solve the problem that the position graph which can not be best compressed in the existing difference expansion authentications,this paper proposes a reversible image embedding authentication,which combines the Reversible Watermark based on Invariability and Adjustment on Pixel Pairs（RWIAPP） and block difference expansion method together.This algorithm separates the host graph to 2×2 pixel blocks,and scans each block in both transverse dimension and vertical dimension.Experimental results show that the proposed algorithm can not only improve the reversible embedding capacity,but also produces only 1/4 host image size drawing.Therefore,this algorithm has better practical value.

关 键 词：可逆水印 差扩算法 奇偶不变特性 和值不变特性 差值调节 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]