这篇文章是撸主要介绍人脸识别经典方法的第一篇，后续会有其他方法更新。特征脸方法基本是将人脸识别推向真正可用的第一种方法，了解一下还是很有必要的(This article is the first line mainly introduces classical face recognition methods, the follow-up there will be other methods to update. The feature face method is basically the first way to make face recognition really available. It is still necessary to understand it.)