一篇用于理解PCA主成分分析的文章，该文章用基于Opencv和C++的源码对PCA进行说明。-One used to understand the PCA principal component analysis of the article, the article described the PCA-based the Opencv and C++ source.

主成分分析（PCA）方法是人脸识别技术中常用的一种一维特征抽取方法。基于PCA的人脸识别。-Principal component analysis (PCA) method is commonly used in face recognition technology as a one-dimensional feature extraction methods. A face recognition algorithm based on PCA .