基于相位偏移的非对称数字水印

An Asymmetric Watermarking Scheme Based on Phase Shift

在传统扩频水印技术的基础上,我们讨论了一种基于相位偏移的非对称数字水印方案。通过将一个预先选择的基准水印在其DFT域中进行随机相位偏移,产生多个实际加入的水印序列,利用各序列与基准水印的相关性,即可由基准水印实现对水印信息的非对称检测。实验结果表明,该方案具一定实用价值。

Based on traditional spread-spectrum watermarking, we discuss an asymmetric watermarking scheme using random-phase-shift. In this scheme, the phase of a reference watermark is shifted randomly in the DFT domain to make many embedding watermarks. The availability of the extracted watermarks is evaluated by comparing the correlation of them with the reference one. Experimental results show the scheme is practical.