摘要： 在DCT域如何确定有效的拉伸因子α是影响水印算法稳健性的关键之一。对3个不 同算法所实现的数字水印的稳健性进行分析比较。通过分析比较认为，利用宿主信号和水 印 信号的信息可以提高确定拉伸因子α的有效性。

关键词: 数字水印, DCT, 信噪比(SNR), 拉伸因子α, 稳健性

Abstract: In DCT domain, one of the keys to influence watermarking robustness is how to determine an effective scaling parameter α. The analysis and compari s on of robustness for watermarks generated with three different algorithms are pr esented in this paper. Through analysis and comparison, the efficiency to det erm ine a scaling parameter α can be improved by exploiting the information of host signal and watermarking signal.

中图分类号: 

• TP309