# 4.1 什么是人脸识别？（What is face recognition?）

* 人脸验证（**face verification**）问题：如果有一张输入图片以及某人的**ID**或者是名字，系统要做的是验证输入图片是否是这个人，也被称作1对1问题，只需要弄明白这个人是否和他声称的身份相符
* 人脸识别（**face recognition**）问题：（1对多问题（$$1:K$$））输入一张人脸图片，验证输出是否为K个模板中的某一个，即一对多问题

一般人脸识别比人脸验证更难。因为假设人脸验证系统的错误率是1%，那么在人脸识别中，输出分别与K个模板都进行比较，则相应的错误率就会增加，约K%。模板个数越多，错误率越大一些

[![](https://github.com/fengdu78/deeplearning_ai_books/raw/master/images/b0d5f91254b48dcc44944bfbdc05992b.png)](https://github.com/fengdu78/deeplearning_ai_books/blob/master/images/b0d5f91254b48dcc44944bfbdc05992b.png)


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