本文首先介绍了采砂船监测系统的开发背景以及相关技术，得出研究本课题的重要性和必要性。

Fristly, this article introduces the developed background and key technology, educes the importance and necessarian of this article.

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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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本文绪论首先介绍了该课题的设计背景、设计意义及相关问题的研究现状。

In this paper, the exordium introduces the background, significance and the current achievement of the design on this subject.

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