基于DCT域的QR码数字水印算法  

Digital Watermarking Algorithm of QR Code Based on DCT Domain

作　　者：刘晓虹[1] 巩瑞春[1] LIU Xiaohong;GONG Ruichun(School of Information Science and Technology,Baotou Teachers＇College,Baotou 014030,China)

机构地区：[1]包头师范学院信息科学与技术学院,内蒙古包头014030

出　　处：《现代信息科技》2018年第12期13-15,18,共4页Modern Information Technology

基　　金：内蒙古自然科学基金:光伏逆变器输出最大功率跟踪算法的研究(项目编号:2016MS0522)

摘　　要：针对电子文档真实性和原始性的识别问题,本文提出了在DCT域中采用抖动调制直流和低频系数添加水印的算法。首先,对载体图像预处理,并将标志图像转换为容量较小的QR码;其次,对载体图像做分块DCT变换;接着,采用抖动调制方式将水印嵌入分块DCT系数的直流、低频部分;最后,对嵌入水印的载体图像做DCT反变换。通过仿真实验,对缩放、裁剪、高斯噪声、压缩等攻击后的文档中的水印进行了提取。实验表明,本算法具有水印隐藏效果好,能够经受一定比例缩放、一定量的图像裁剪和适度的JPEG压缩等攻击,能够实现盲检测及嵌入较大容量标志信息的优点。Aiming at the identification of authenticity and originality of electronic documents,this paper proposes a method of adding digital watermark in DCT domain by using dither modulation DC and low frequency coefficients. Firstly,the carrier image is preprocessed,the logo image is converted to a smaller capacity of QR code;Secondly,the carrier image is divided into blocks,DCT transform;then,the watermark is embedded into the DC and low frequency coefficients of the block DCT by using the dither modulation method. Finally,the DCT inverse transform of the carrier image containing the watermark is done. The watermark information is extracted from the electronic documents after the attack,such as scale,cropping,Gauss noise,compression and so on. The results show that this algorithm has the advantages of good watermark hiding effect,it is able to withstand a certain scaling,a certain amount of image cropping and moderate JPEG compression coding etc.,and blind detection of watermark information and embedded larger logo image.

关 键 词：数字水印 二值图像 离散余弦变换 快速响应矩阵码 抖动调制 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]