中文说明：应用背景 人脸识别，是基于人的脸部特征信息进行身份识别的一种生物识别技术。用摄像机或摄像头采集含有人脸的图像或视频流，并自动在图像中检测和跟踪人脸，进而对检测到的人脸进行脸部的一系列相关技术，通常也叫做人像识别、面部识别。 关键技术 人脸识别系统主要包括四个组成部分，分别为：人脸图像采集及检测、人脸图像预处理、人脸图像特征提取以及匹配与识别。 一般来说，人脸识别系统包括图像摄取、人脸定位、图像预处理、以及人脸识别（身份确认或者身份查找）。系统输入一般是一张或者一系列含有未确定身份的人脸图像，以及人脸数据库中的若干已知身份的人脸图象或者相应的编码，而其输出则是一系列相似度得分，表明待识别的人脸的身份。
English Description：
Application backgroundFace recognition is a biometric identification technology based on human facial feature information. Using a video camera or camera containing human face in the image or video flow, and automatically detecting and tracking human faces in the image, and then the detected face to face a series of related technology, also commonly known as face recognition, face recognition.Key TechnologyFace recognition system includes four parts: face image acquisition and detection, face image preprocessing, feature extraction and matching and recognition of facial images.Generally, the face recognition system includes image capture, face localization, image preprocessing, and face recognition (identity verification or identity search).. Input system is generally one or a series of containing the identity of the face image, and the face database, the number of known identity face image or the corresponding code, and the output is a series