首先，本文介绍了数字水印问题的提出及其相关概念，阐述了本课题的研究背景和意义。

Firstly, this paper introduces the development and some related concepts of digital watermarking, which elucidates the background and significance of the research.

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本文首先对本课题背景和国内外研究现状作了阐述，继而明确了完成本毕业设计的目的与意义。

This dissertation firstly describes the background and situation of this topic, and then grasps the meaning of this share of design.

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本文首先对本课题背景和国内外研究现状作了阐述，继而明确了完成本毕业设计的目的与意义。

This dissertation firstly describes the background and situation of this topic, and then grasps the meaning of this share of design.

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