journal6 ›› 2010, Vol. 31 ›› Issue (1): 30-34.

• 计算机 • 上一篇    下一篇

基于DCT和DHT组合的半脆弱图像水印方案

  

  1. (1.杭州电子科技大学通信学院,浙江 杭州310018;2.安徽工业大学计算机学院,安徽 马鞍山243002)
  • 出版日期:2010-01-25 发布日期:2012-04-19
  • 作者简介:周建钦(1963-),男,山东巨野人,教授,硕士,主要从事信息隐藏、密码学与理论计算机科学研究.
  • 基金资助:

    国家自然科学基金资助项目(60802047);国家自然科学基金委员会与中国工程物理研究院联合基金资助(10776077)

Semi-Fragile Watermarking Scheme Based on DCT and DHT

  1. (1.College of Telecommunication,Hangzhou Electronics University,Hangzhou,310018,China;2.College of Computer Science and Technology,Anhui University of Technology,Maanshan 243002,Anhui China)
  • Online:2010-01-25 Published:2012-04-19

摘要:半脆弱性水印方案要求对一般的数字水印攻击具有一定的稳健性,同时具有一定的检测篡改能力.对DCT和DHT的组合变换特性进行了分析,设计了一种新的半脆弱性方案.该方案首先对图像作整体DCT变换,再选择DCT系数的中、低频域进行DHT变换,将水印信息嵌入在DCT和DHT变换后的系数中.选择DCT系数的中、低频域嵌入水印使水印具有一定的稳健性;DCT和DHT变换后的系数反映了图像的部分特征,对图像的篡改类型和区域具有一定的检测能力.实验验证了该方案的有效性.

关键词: 数字水印, 稳健性, 半脆弱性, DCT, DHT

Abstract: A semi-fragile watermarking scheme needs robustness to some common attacks and capability of checking tamper.The combination of DCT and DHT is analyzed.From the analysis,a novel semi-fragile watermarking scheme is presented.In this scheme,the host image is first transformed by DCT,then some region of low or middle frequency coefficients is chosen to be transformed by DHT.Last,the watermark is embedded into the region.The watermark embedded into the low or middle frequency coefficients is robust.After the two transforms,there are some host image features in the transformed region so that the tampered region and sort of watermarked image can be reflected.Simulation results show that it is effective.

Key words: digital watermark, robust, semi-fragile, DCT, DHT

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