基于QR码的自适应抗打印扫描水印算法  

Adaptive Watermarking Algorithm Resistant to Printing and Scanning Based on QR Code

作　　者：王春霞[1] 王晓红[1] 孙业强[1] 肖颖[2] 丁桂芝 章婷 

机构地区：[1]上海理工大学,上海200093 [2]上海出版印刷高等专科学校,上海200093 [3]上海市印刷行业协会,上海200093

出　　处：《包装工程》2017年第21期186-190,共5页Packaging Engineering

基　　金："柔版印刷绿色制版与标准化实验室"招标课题(ZBKT201709)

摘　　要：目的提出一种基于QR码的自适应抗打印扫描盲水印算法。方法首先对载体QR码进行三级小波变换,并对低频部分进行4×4分块Schur分解,然后利用子块酉矩阵的系数差值的稳定性,将二值水印信息自适应嵌入到载体QR码中,最后对含水印QR码打印扫描并提取出水印信息。同时,算法实现了盲提取。结果算法能较好抵抗打印扫描攻击,并对高斯噪声、椒盐噪声、斑纹噪声、泊松噪声、JPEG压缩等攻击具有较强的鲁棒性。结论算法具有较强的抗打印扫描性能,可以广泛应用于数字产品的版权保护。The work aims to propose an adaptive blind watermarking algorithm resistant to printing and ning based on QR code. Firstly, the carrier QR code was processed by three-level DWT transform and the low-frequency part was subject to 4×4 block Schur decomposition. Then, the binary watermarking information was adaptively embedded into the carrier QR code based on a stable coefficient difference of sub-block U matrix. Finally, the watermarking information was extracted from the QR code which was printed and scanned. Meanwhile, the algorithm was blindly extracted. The experimental results showed that the algorithm could better resist print-scan attack, and it had higher robustness in resisting the attacks like Gaussian noise, salt and pepper noise, speckle noise, Poisson noise and JPEG compression. With strong performance in resisting prin-scan attack, the algorithm can be widely applied in the copyright protection of digital products.

关 键 词：QR码 水印 DWT变换 SCHUR分解 抗打印扫描 

分 类 号：TS801.3[轻工技术与工程] TP391[自动化与计算机技术—计算机应用技术]