# face_recognition 在 windows 下安装与使用

face_recognition 是一个强大、简单、易上手的人脸识别开源项目，并且配备了完整的开发文档和应用案例，特别是兼容 树莓派 系统。

最近想用树莓派做一个监控摄像头的项目，准备现在 windows 上把程序先做好再部署到 linux 上，但是官方并不推荐在 windows 上使用。以下是我的踩坑之旅

# 本地环境

第一步时就出现了巨大折磨

	CMake is not installed on your system!

	Or it is possible some broken copy of cmake is installed on your system.
	It is unfortunately very common for python package managers to include
	broken copies of cmake. So if the error above this refers to some file
	path to a cmake file inside a python or anaconda or miniconda path then you
	should delete that broken copy of cmake from your computer.

	Instead, please get an official copy of cmake from one of these known good
	sources of an official cmake:
	- cmake.org (this is how windows users should get cmake)
	- apt install cmake (for Ubuntu or Debian based systems)
	- yum install cmake (for Redhat or CenOS based systems)

	On a linux machine you can run `which cmake` to see what cmake you are
	actually using. If it tells you it's some cmake from any kind of python
	packager delete it and install an official cmake.

	More generally, cmake is not installed if when you open a terminal window
	and type
	cmake --version
	you get an error. So you can use that as a very basic test to see if you
	have cmake installed. That is, if cmake --version doesn't run from the
	same terminal window from which you are reading this error message, then
	you have not installed cmake. Windows users should take note that they
	need to tell the cmake installer to add cmake to their PATH. Since you
	can't run commands that are not in your PATH. This is how the PATH works
	on Linux as well, but failing to add cmake to the PATH is a particularly
	common problem on windows and rarely a problem on Linux.

对于这个问题，只是少了一个 cmake 库，好搞

pip install cmake

但是安装之后还是有问题

应该是没有 visualStudio 的编译器

于是我去 visual studio 的官网上安装了以下两个组件

再装下 dlib 库试试

pip install dlib

就这么水灵灵的撞上了。

剩下的就要简单很多了，直接运行 pip 指令试一试

pip install face_recognition

安装成功

完美,安装成功了

又又又又又出现了问题，缺少 face_recognition_models

按照提示试一下

pip install git+https://github.com/ageitgey/face_recognition_models

尝试运行时又出现错误

这是因为缺少 setuptools 库

pip install setuptools

ok, 完美！终于装好这个库了

	import face_recognition
	from PIL import Image
	image = face_recognition.load_image_file("./img.png")
	face_locations = face_recognition.face_locations(image)
	print("I found {} face(s) in this photograph.".format(len(face_locations)))
	for face_location in face_locations:
	top, right, bottom, left = face_location
	print("A face is located at pixel location Top: {}, Left: {}, Bottom: {}, Right: {}".format(top, left, bottom, right))
	face_image = image[top:bottom, left:right]
	pil_image = Image.fromarray(face_image)
	pil_image.show()