| 摘要: |
| 传统盲加性扩频水印系统具有鲁棒性高、检测值低、容量小的特点.载体信号的干扰是导致检测值偏低的主要原因.从高斯噪声中高斯信号的检测原理出发,对相关性检测器进行了理论分析.此外,还讨论了归一化相关检测器与信噪比的关系以及相关性检测器的应用条件.基于此分析,提出了一种改进盲加性水印算法.实验结果表明,该算法有效地抑制了载体信号的干扰,提高了盲加性扩频水印系统的检测性能,同时具有很好的感知质量和鲁棒性. |
| 关键词: 盲加性水印 扩频 高斯分布 相关性检测 |
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| 基金项目:Supported by the National Special Research Foundation for the Commonweal of Society of China under Grant No.2001DIB10060(国家社会公益研究专项基金) |
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| A Blind Additive Watermarking Algorithm Under Intense Interference Background |
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YAN Xiao,MENG Ying-Jie,WANG Yang,YU Jun
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| Abstract: |
| Traditional blind additive SS (spread spectrum) watermarking systems have such features: high robustness, low detection value and small capacity. The main reason leading to low detection value is the host signal’s interference. Based on the Gaussian signal detection principle under Gaussian noise, the correlation detection is analyzed in theory. In addition, the using condition of correlation detector and the relationship between the normalized correlation detector and SNR (signal noise ratio) are discussed in this paper. Based on these analyses, an improved blind additive watermarking algorithm is designed. Experimental results show that the algorithm effectively holds back the interference of host signal and the performance of detection has been greatly improved. Furthermore, it has greater robustness and imperceptibility. |
| Key words: blind additive watermarking spread spectrum Gaussian distributed correlation detection |
