求翻译：本文首先简要介绍了机械表面裂纹检测的原理和数字图像处理技术的一些基本概念，包括它研究的内容、特点、现状以及优点，。是什么意思？

This paper briefly introduces some basic concepts of the principle of mechanical surface crack detection and digital image processing technology, including its research content, features, status and advantages.

This article first provides an overview of the mechanical surface crack detection theory and the digital image processing techniques of some of the basic concepts, including its research Content, features, benefits, as well as status quo.

This article first was brief introduced the mechanical surface crack examination principle and digital image processing technology some basic concepts, the content, the characteristic, the present situation as well as the merit which studied including it.

This paper begins with a brief introduction to the mechanical theory of surface crack detection and some basic concepts of digital image processing techniques, including its contents, features, research status and benefits.

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