基于二维离散余弦变换的图像水印算法研究  

Image Watermarking Algorithm Based on Two-Dimensional Discrete Cosine Transform

作　　者：王海文 李杰[2] 王鸿林 陈桂英 WANG Hai-wen;LI Jie;WANG Hong-lin;CHEN Gui-ying(College of Teacher Education,Quzhou University,Quzhou 324000,China;School of Information Engineering,Quzhou College of Technology,Quzhou 324000,China;Zhejiang Minong Century Group,Hangzhou 310030,China)

机构地区：[1]衢州学院教师教育学院,衢州324000 [2]衢州职业技术学院信息工程学院,衢州324000 [3]浙江美浓世纪集团有限公司,杭州310030

出　　处：《印刷与数字媒体技术研究》2023年第3期119-124,共6页Printing and Digital Media Technology Study

基　　金：教育部新工科研究与实践项目--浙闽赣皖四省边际应用型高校新工科教育共同体建设与实践(No.E-GCCRC20200308);浙江省产学合作协同育人项目--新工科背景下视觉传达设计专业校企协同育人的创新与实践(No.浙教办函〔2021〕7号);衢州市重点创新团队--衢州学院文化创意与融媒体传播创新团队(No.衢委人才[2020]3号)。

摘　　要：针对数字版权保护的应用需要,研究了基于二维离散余弦变换的图像数字水印算法的适用性。首先在Matlab平台中设计了基于二维离散余弦变换的数字水印嵌入、提取和抗攻击的算法程序,然后采用经典灰度二值图像进行了实验研究。结果表明,将二维离散余弦变换应用于图像数字水印,其水印图像的质量保持较好,且水印具有较好的不可见性,抗击低通滤波的能力较好,但抗旋转攻击和较大范围剪切攻击的能力较弱,因此其总体鲁棒性相对较好,能够较好地满足图像数字水印的应用要求,但后续要对二维离散余弦变换的水印算法进行改进性研究,尤其要提升其鲁棒性,从而更好地满足数字版权保护的应用需求。According to the application needs of digital copyright protection,the applicability of the image digital watermarking algorithm based on two-dimensional discrete cosine transform(DCT)was studied.Firstly,the algorithm program of digital watermark embedding,extraction and antiattack based on two-dimensional DCT was designed in the Matlab platform,and then the experimental research was carried out on classical gray-scale binary images.The results showed that when the two-dimensional DCT is applied to image digital watermarking,the quality of the watermark image is maintained well with good invisibility and the ability to resist low-pass filtering,but the ability to resist rotation attack and large-scale clipping attack is weak.Therefore,the overall robustness is relatively good and can meet the application requirements of image digital watermarking.At the same time,the two-dimensional DCT watermarking algorithm should be improved.In particular,its robustness should be improved to better meet the application requirements of digital copyright protection.

关 键 词：图像水印算法 二维离散余弦变换 数字水印 数字版权保护 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] TS801.8[自动化与计算机技术—计算机科学与技术]