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工程科学与技术:2007,39(5):133-136
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一种基于二维DFT的一对多非对称数字水印算法
(西安电子科技大学 ISN国家重点实验室,陕西 西安 710071)
An Asymmetric Digital Watermarking Algorithm Based on 2DFT
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投稿时间:2006-06-30    
中文摘要: 针对当今水印系统中的公开验证难题及水印存储信息量大的问题,提出了一种一对多的非对称数字水印算法。该水印算法基于二维离散傅立叶变换(2DFT)。参考水印的相位在2DFT域中被任意地改变,从而得到不同的嵌入水印。这些嵌入水印彼此相关,并且和参考水印均有相同的互相关性。通过比较互相关系数值和判决门限,实现水印检测。仿真结果表明,选择恰当的判决门限,参考水印能正确地检测嵌入水印,而由参考水印生成的其它嵌入水印却不能实现水印检测。参考水印的信息公开不会降低嵌入水印的安全性。因此,该算法实现水印的公开验证,同时只需存储一个参考水印就能检测多个嵌入水印,降低了水印存储信息量。
Abstract:An improved watermarking algorithm is proposed to deal with public watermarking verification and large information reserves. This algorithm is based on two dimensional discrete Fourier transform (2DFT). The phase of the reference watermark is shifted randomly in the 2DFT domain to obtain many embedding watermarks. They are correlated with one another and have the same correlation with the reference one. To decide the presence of the watermark, the detector compares the correlation coefficient with the decision threshold. The simulation results show that with the proper threshold, the reference watermark can be used to detect the embedding watermark, but other embedding watermarks cannot. The publication of reference watermark does not compromise the embedding one. This algorithm realizes the public verification of watermark, and needs only one reference watermark for detecting embedding watermarks, which decreases the watermark storage.
文章编号:20070526     中图分类号:    文献标志码:
基金项目:国家自然科学基金重大资助项目(90304008);西安电子科技大学研究生创新基金(创05019);教育部高校博士点基金资助项目(2004071001)
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刘向丽,党岚君,寇卫东.一种基于二维DFT的一对多非对称数字水印算法[J].工程科学与技术,2007,39(5):133-136.
.An Asymmetric Digital Watermarking Algorithm Based on 2DFT[J].Advanced Engineering Sciences,2007,39(5):133-136.