说明：  在这篇文章中，我们主要阐述了基于PCA和LDA的人脸识别技术。这个技术包含两个步骤：首先，我们通过PCA将人脸图片从原始向量空间中提取到子向量空间——特征脸空间；然后，再通过LDA获得一个线性分类器。
(In this article, we mainly elaborated based on PCA and LDA face recognition technology. This technique consists of two steps: First, we will face images extracted from the original vector space to sub-vector space by PCA- Eigenface space Then, LDA obtained by a linear classifier.)