基于双重Hilbert扫描的数字水印算法  

A NOVEL WATERMARKING ALGORITHM BASED ON DOUBLE HILBERT SCANNING

作　　者：陈画[1] 

机构地区：[1]浙江长征职业技术学院,浙江杭州310023

出　　处：《计算机应用与软件》2013年第5期298-300,333,共4页Computer Applications and Software

摘　　要：提出一种基于双重Hilbert扫描的数字水印算法。该算法先将原始图像各4×4块按Hilbert扫描顺序排列,再对4×4块内的像素按Hilbert扫描顺序转换为准均匀三次B样条曲线的控制顶点向量。然后对B样条曲线进行小波分解获得曲线的低分辨部分。通过调整Hilbert逻辑相邻的两B样条曲线低分辨系数关系来实现水印信号的嵌入。水印嵌入后重构新的B样条控制顶点,新的控制顶点经逆Hilbert重置得到水印图像。实验结果表明,算法对图像压缩、滤波、缩放等攻击具有较强抵抗力。In this paper we present a digital watermarking algorithm which is based on double Hilbert scanning.First,all the 4×4 blocks of the primary image are put in order according to Hilbert scanning sequence,then the pixels of each 4×4 block are transformed to control vertex vectors of the quasi-uniform cubic B-spline curves according to Hilbert scanning sequence.Secondly,the wavelet decomposition is applied to B-spline curves to obtain its low-resolution proportion.The watermark signal embedding is implemented by modifying the low-resolution coefficients relation of two B-spline curves of Hilbert logical neighbouring.When the watermark is embedded,B-spline control vertex will be reconstructed;the watermarking image will be obtained from the new control vertex with reverse Hilbert reset.Experimental results show that this algorithm is strong in withstanding the attacks of image compression,filtering and scaling.

关 键 词：B样条曲线 数字水印 小波 多分辨表示 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论]