A Text Image Watermarking Algorithm Based on Image Enhancement  

作　　者：Baowei Wang Luyao Shen Junhao Zhang Zenghui Xu Neng Wang 

机构地区：[1]School of Computer,Nanjing University of Information Science and Technology,Collaborative Innovation Center of Jiangsu Atmospheric Environment and Equipment Technology,Digital Forensics Engineering Research Center of Digital Forensics Ministry of Education,Nanjing,210044,China [2]School of Software,Nanjing University of Information Science and Technology,Nanjing,210044,China

出　　处：《Computers, Materials & Continua》2023年第10期1183-1207,共25页计算机、材料和连续体（英文）

基　　金：sponsored by the National Natural Science Foundation of China under Grants 61972207,U1836208,U1836110,61672290,and the Project was through the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institution.

摘　　要：Digital watermarking technology is adequate for copyright protection and content authentication.There needs to be more research on the watermarking algorithm after printing and scanning.Aiming at the problem that existing anti-print scanning text image watermarking algorithms cannot take into account the invisibility and robustness of the watermark,an anti-print scanning watermarking algorithm suitable for text images is proposed.This algorithm first performs a series of image enhancement preprocessing operations on the printed scanned image to eliminate the interference of incorrect bit information on watermark embedding and then uses a combination of Discrete Wavelet Transform(DWT)-Singular Value Decomposition(SVD)to embed the watermark.Experiments show that the average Normalized Correlation(NC)of the watermark extracted by this algorithm against attacks such as Joint Photographic Experts Group(JPEG)compression,JPEG2000 compression,and print scanning is above 0.93.Especially,the average NC of the watermark extracted after print scanning attacks is greater than 0.964,and the average Bit Error Ratio(BER)is 5.15%.This indicates that this algorithm has strong resistance to various attacks and print scanning attacks and can better take into account the invisibility of the watermark.

关 键 词：Print-resistant scanning image enhancement DWT SVD embedding intensity 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]