计算机工程与应用 ›› 2008, Vol. 44 ›› Issue (5): 125-127.

• 研发、测试 • 上一篇    下一篇

基于系数关系的DCT域数字图像水印

蒋 铭1,孙水发1,2,郑 胜1,2,万钧力1   

  1. 1.三峡大学 电气信息学院,湖北 宜昌 443002
    2.三峡大学 智能视觉与图像信息研究所,湖北 宜昌 443002
  • 收稿日期:2007-07-02 修回日期:2007-08-23 出版日期:2008-02-11 发布日期:2008-02-11
  • 通讯作者: 蒋 铭

Digital image watermarking based on relationship of coefficients in DCT domain

JIANG Ming1,SUN Shui-fa1,2,ZHENG Sheng1,2,WAN Jun-li1   

  1. 1.College of Electrical Engineering and Information Technology,China Three Gorges University,Yichang,Hubei 443002,China
    2.Institute of Intelligent Vision and Image Information,China Three Gorges University,Yichang,Hubei 443002,China
  • Received:2007-07-02 Revised:2007-08-23 Online:2008-02-11 Published:2008-02-11
  • Contact: JIANG Ming

摘要: 提出了一种DCT域的数字图像盲水印算法,该算法将图像进行8*8分块后对各块图像进行DCT变换。之后将水印信息嵌入到选取的中频系数之间的关系中;提取水印时不需要原始图像,实现了盲检测;而且水印嵌入位置可由密码控制,增强了算法的保密性和灵活性;不可感知性和鲁棒性可调。仿真实验结果表明该算法在保证水印不可感知性的情况下,对一些常见的恶意攻击具有良好的鲁棒性。

关键词: 数字水印, DCT变换, 系数关系, 盲水印

Abstract: A blind digital image watermarking algorithm in DCT domain is proposed.In the algorithm,block DCT with size of 8*8 is performed on the given image.The relationship between the selected DCT middle frequency coefficients is used to embed the watermark.No original image is needed when detecting the watermark.The embedding position of the watermark is determined by a key and the security is enhanced.Numerical experiments are carried out and the results show that the algorithm can resist against several attacks,such as JPEG compression,adding noise,histogram equalization,keeping the watermark imperceptible.

Key words: digital watermarking, DCT, coefficients relationship, blind watermarking