一种改进的基于JPEG图像可逆水印算法  

An Improved Reversible Watermarking Scheme for JPEG Images

作　　者：何顺[1] 姚剑波 梁海英[1] HE Shun;YAO Jian-bo;LIANG Hai-ying(Hezhou College,Hezhou Guangxi 542899,China)

机构地区：[1]贺州学院,广西贺州542899

出　　处：《计算机仿真》2020年第8期219-223,共5页Computer Simulation

基　　金：教育部高等教育司创新创业教育改革项目(201602027027);广西高校中青年教师基础能力提升项目(2019KY0707)。

摘　　要：为了提高JPEG图像可逆水印容量和PSNR值,在文献[12]的基础之上提出一种改进的基于JPEG图像可逆水印算法。算法利用JPEG图像中带有零间隔的8×8 DCT分块矩阵来嵌入水印,每一个带有零间隔的DCT分块分别嵌入2位水印信息,并且将这2位水印信息嵌入到DCT分块矩阵最后一个非零系数之后的第1或者第2位零系数中。采取的方法是首先将2位水印信息位组成二进制代码:00,01,10,11,然后将其分别映射为十进制值-1,1,-1,1。接着用这四个十进制数来替换最后一位非零系数之后的第1或者第2位零系数。实验结果表明,对比文献[12]算法,图像水印的嵌入容量和PSNR值都得到一定的提升。In order to improve the reversible watermarking capacity and PSNR value of JPEG image,an improved reversible watermarking algorithm based on JPEG images was proposed.Firstly,the 8×8 DCT partitioned matrix with zero interval in JPEG image algorithm was used to embed watermark.And then,each DCT block with zero interval was embedded with 2-bit watermark information,and the 2-bit watermark information was embedded in the first or second zero coefficient behind the last non-zero coefficient in DCT partitioned matrix.In this method,the bits of 2-bit watermarking information were composed of binary codes(00,01,10,11),and then they were mapped to decimal values(-1,-1,1,1).Moreover,these decimal values were used to replace the first or second zero coefficient behind the last non-zero coefficient.Experimental results show that the embedding capacity and PSNR value of image watermark are higher than the algorithm in Reference[12].

关 键 词：水印容量 可逆水印 图像 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]