基于DCT变换的彩色图像水印盲提取算法  

Blind watermarking algorithm for color image based on DCT transform

作　　者：赵春玉[1,2] 时宏伟[1,2] 胡可鑫 颜可壹 

机构地区：[1]四川大学视觉合成图形图像技术国防重点学科实验室,四川成都610065 [2]四川大学计算机学院,四川成都610065

出　　处：《计算机工程与设计》2015年第3期597-602,共6页Computer Engineering and Design

基　　金：国家863高技术研究发展计划基金项目(2012AA011804)

摘　　要：为利用QR码的快速识别、高容量和高容错等特性,实现彩色图像的水印盲提取,提出基于DCT变换的彩色图像水印嵌入和提取算法。对彩色图像的3个通道进行8*8分块,取DC系数中MSB位作为水印嵌入地址,通过余数调整的方法实现水印的嵌入。提取水印时,通过对水印嵌入位的余数判定,对3个通道的结果进行投票处理,提取出水印信息,提取过程不需要原图像和原水印图像,是一种盲提取算法。通过实验验证了该方法的鲁棒性和透明性,计算复杂度较低,相对于很多变换域水印算法有明显优势。To use the advantages of QR-code including quick identification,high capacity and high fault tolerance,a blind watermarking embedding and extracting algorithm for color images was put forward based on DCT transform.Firstly,threechannels of color image were segmented into 8＊8blocks,the MSB of the DC coefficients of every block was taken as the watermark embedding address and watermark was embedded.When extracting the watermark,through the remainder of the DC coefficients,the results of the three-channel were voted,the watermark was extracted without using the original cover image and the original watermark image.So it was a blind extraction algorithm.Experimental results show the algorithm can satisfy the robustness and transparence requirements of the watermarking system.Additionally,the computational complexity of the algorithm is lower than that of other algorithms.

关 键 词：数字水印 隐写术 QR码 彩色图像 盲提取 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]