基于AKAZE算子的抗翻拍自适应鲁棒性水印  

Adaptive robust watermarking based on AKAZE algorithm

作　　者：郑天朗 吴建斌[1] ZHENG Tianlang;WU Jianbin(College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China)

机构地区：[1]华中师范大学物理科学与技术学院,湖北武汉430079

出　　处：《微电子学与计算机》2024年第4期12-19,共8页Microelectronics & Computer

基　　金：国家自然科学基金(U1736121);中央高校基本科研业务费专项(CCNU22JC024)。

摘　　要：针对现有抗翻拍攻击水印的鲁棒性不足以抵抗新型翻拍攻击且透明性不佳等问题,引入自适应思想,提出一种基于AKAZE算子的自适应水印算法。首先利用AKAZE算子定位出关键点,随后根据关键点间的距离与对图像边框的距离对关键点做初步的筛选,然后构建筛选后关键点邻域熵值、水印嵌入强度与嵌入前后的平均相似度三者之间的映射,构建完映射后可仅根据图像块的熵值自适应筛选关键点,并得到二次筛选后关键点邻域合适的嵌入率,最后在筛选后的关键点邻域中利用奇异值分解进行水印嵌入。实验结果表明,该水印算法在保持了良好的不可见性的同时具有极佳的鲁棒性,其性能较现有抗翻拍攻击水印算法有显著提高。Aiming at the problem that the robustness of the existing anti-remake attack watermark is not enough to resist the new type of remake attack and the transparency is not good,an adaptive watermarking algorithm based on AKAZE operator is proposed by introducing the adaptive idea.Firstly,the AKAZE operator is used to locate the key points,and then a preliminary screening is made for the key points according to the distance between the key points and the distance to the image frame,and then a mapping is constructed between the entropy value of the filtered key point neighborhood,the watermark embedding strength and the average similarity before and after embedding.After the mapping is constructed,the key points can be adaptively filtered only according to the entropy value of the image block,and the appropriate embedding rate of the key point neighborhood after the secondary screening is obtained,Finally,the watermark is embedded in the filtered key point neighborhood using singular value decomposition.The experimental results show that this watermarking algorithm has excellent robustness while maintaining good imperceptibility,which is significantly improved compared with the existing anti-screen-shooting attack watermark.

关 键 词：数字水印 翻拍攻击 自适应 鲁棒性 AKAZE 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]