介绍了数字水印技术背景、基本原理、特点及现状，并给出典型算法的分类和目前存在的问题。

This paper describes the background basic principle, features and current situation of digital watermarking, and provides the classification of typical algorithm and analyzes the existing problem.

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本文介绍了数字水印的定义，分析了几种典型算法，并提出了评价数字水印算法的评估标准和攻击方法。

In this paper, we introduce the concept of digital watermarking, analyze some typical algorithm, and propose evaluation criterions and attacking methods which evaluate digital watermarking algorithm.

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本文在介绍水印技术的基本要求之后，重点讨论几种典型的数字水印嵌入和检测算法。

After introducing basic demands, this article pay most attention to argue about several representative watermark embedding and detecting techniques.

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