Robust Watermarking of Screen-Photography Based on JND  

作　　者：Siyu Gu JinHan Xingming Sun Yi Cao 

机构地区：[1]Nanjing University of Information Science&Technology,Nanjing,210044,China [2]Engineering Research Center of Digital Forensics,Ministry of Education,Nanjing,201144,China [3]Department of Electrical and Computer Engineering,University of Windsor,401 Sunset Avenue,Windsor,ON,N9B 3P4,Canada

出　　处：《Computers, Materials & Continua》2022年第6期4819-4833,共15页计算机、材料和连续体（英文）

基　　金：This work is supported by the National Key R&D Program of China under grant 2018YFB1003205;by the National Natural Science Foundation of China under grant U1836208,U1836110;by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)fund;by the Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET)fund,China.

摘　　要：With the popularity of smartphones,it is often easy to maliciously leak important information by taking pictures of the phone.Robust watermarking that can resist screen photography can achieve the protection of information.Since the screen photo process can cause some irreversible distortion,the currently available screen photo watermarks do not consider the image content well and the visual quality is not very high.Therefore,this paper proposes a new screen-photography robust watermark.In terms of embedding region selection,the intensity-based Scale-invariant feature transform(SIFT)algorithm used for the construction of feature regions based on the density of feature points,which can make it more focused on the key content of the image;in terms of embedding strength,the Just noticeable difference(JND)model is applied to limit the intensity of the watermark embedding according to the luminance and texture of the picture to balance robustness and invisibility;after embedding watermark,the coefficients in the neighborhood are again adjusted with optimal constraints to improve the accuracy of watermark extraction.After experiments,it is shown that the method we proposed can improve the correct rate of watermark extraction,the quality of the visual aspect of the watermarked picture is also improved.

关 键 词：Screen photography robust watermarking SIFT JND 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]