DWT域最佳水印检测器的设计及其应用

The Design and Application of DWT Domain Optimum Watermark Decoders

水印检测错误会损害水印处理系统的可信度 .在水印实用化过程中 ,一个必须解决的问题是如何使水印检测器的错误率最小 .与传统的试探法不同 ,本文从理论上探讨了如何在给定的虚警概率下 ,在离散小波变换域设计最优水印检测器的方法 .同时还提出了一种多分辨率的水印处理算法来使用所得到的最优检测器 .实验证明 。

The detection errors undermine the credibility of a watermarking system. It is crucial to minimize the false detection rate in watermark detection prior to the real-world applications of watermarks. Different from early heuristic methods, the watermark problem is cast into a solid theoretical framework in this paper. For a given false alarm rate, the watermark decoder is made optimal under the Neyman-Pearson criterion. A new multiresolution watermarking algorithm is proposed to use the optimum decoder. Experimental results show that the new decoder has superior advantages over the existing ones in many aspects.