表述了人脸识别的研究的方向，以及实现系统设计中所使用到的技术和算法。-Expression recognition research direction, as well as the techniques and algorithms used in the system design.

基于PCA的人脸识别系统的设计与实现 基于PCA的人脸识别系统的设计与实现-PCA-based face recognition system design and implementation of PCA-based Face Recognition System Design and Implementation