计算机应用 ›› 2013, Vol. 33 ›› Issue (03): 752-755.DOI: 10.3724/SP.J.1087.2013.00752

• 信息安全 • 上一篇    下一篇

基于离散傅里叶变换的数字全息水印

吴清乐*,彭代渊   

  1. 西南交通大学 信息科学与技术学院,成都 610031
  • 收稿日期:2012-09-20 修回日期:2012-11-06 出版日期:2013-03-01 发布日期:2013-03-01
  • 通讯作者: 吴清乐
  • 作者简介:吴清乐(1987-),女,甘肃天水人,硕士研究生,主要研究方向:数字图像水印、全息影像; 彭代渊(1955-),男,四川资阳人,教授,博士,主要研究方向:网络信息安全、代数编码。

Digital hologram watermarking based on discrete Fourier transform

WU Qingle*, PENG Daiyuan   

  1. School of Information Science and Technology, Southwest Jiaotong University, Chengdu Sichuan 610031, China
  • Received:2012-09-20 Revised:2012-11-06 Online:2013-03-01 Published:2013-03-01
  • Contact: Qing LeWu

摘要: 针对打印扫描过程对硬拷贝水印图像的攻击,提出一种抗打印扫描的全息水印改进算法。改进的算法将双水印的数字全息图隐藏在载体图像的离散傅里叶变换(DFT)中频系数的幅度谱中,并在中心对称的相应块做同样的替换,通过控制图像纹理的峰值信噪比(PSNR)自适应地控制水印嵌入强度,并实现最佳的水印嵌入。改进的算法不可见性明显提高,嵌入有意义水印容量大,具有抗剪切、噪声、JPEG压缩等攻击的优势,且通过打印扫描校正,可从打印扫描图像中清晰提取水印。

关键词: 数字全息, 打印扫描, 数字水印

Abstract: A print-scan resilient watermarking algorithm based on digital hologram was studied in this paper. A hologram image of two watermark was embedded into the amplitude of middle spectral magnitude of the host image, and the same replacement was done in the central semmetry block. A Peak Signal-to-Noise Ratio (PSNR) threshold adapted to the texture of the host image was set to adjust the watermark shrength. The proposed approach shows advantages in invisibility, robustness, embedding capacity, resistance against the attack of scaling, noise, and JPEG compression. The watermark can be extracted from the watermarked image after print-scan.

Key words: digital hologram, print-scan, digital watermarking

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