为了增强水印信号的安全性，采用了基于混沌和位平面的水印加密算法。
In order to enhancing the security of the watermark, we employ an encryption technology based on chaos and bit plan.
利用混沌系统的特点调制了两种不同的混沌序列，分别用于水印加密和子图像的抽取。
Two chaotic sequences are modulated according characters of chaotic system, using for watermark encryption and sub image extraction.
分析了几种典型的对称数字水印算法，并且对对称水印加密算法和非对称水印加密算法的特点进行比较分析。
This paper is devoted to some typical asymmetric watermarks and some basic characteristics of asymmetric watermark and symmetric watermark.
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