一种基于差值直方图平移的多层可逆水印算法  

A MULTILEVEL REVERSIBLE WATERMARKING SCHEME BASED ON DIFFERENCE HISTOGRAM SHIFTING

作　　者：刘芳[1,2] 汪玉凯[1] 

机构地区：[1]大连理工大学管理科学与工程学院,辽宁大连116024 [2]北京电子科技学院,北京100070

出　　处：《计算机应用与软件》2014年第1期303-307,共5页Computer Applications and Software

基　　金：国家自然科学基金项目(61070250)

摘　　要：提出一种基于差值直方图平移的多层可逆水印算法。首先划分图像块,每个图像块内产生两个差值;然后建立所有差值的直方图,使得产生的直方图陡峭,峰值点出现频率较大;最后利用矩阵编码的思想在每个图像块内至多修改一个像素的值,达到同时嵌入水印和平移直方图的目的。实验表明,该算法不仅可以实现可逆水印,而且水印不可见性较好,嵌入水印后图像的PSNR高于52.90 db,嵌入容量较高,算法复杂度较低。A multilevel reversible watermarking scheme based on difference histogram shifting is proposed. First the image is divided into blocks, in each block there are two difference values generated, then the histogram of all difference values is built, which makes the genera- ted histogram steep and has higher chance to find the peak points. Finally with the idea of matrix encoding, the pixel value in each image block is modified no more than one, we reach the goal of embedding the watermark and shifting the histogram simultaneously. Experiments show that this algorithm can realise reversible watermark, furthermore, the invisibility of watermark is much better. The PSNR is greater than 52.90 db in the image with watermark embedded, the embedding capacity is higher, and the complexity of algorithm computation is lower as well.

关 键 词：可逆水印 直方图平移 多层 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]