opencv安装网页：https://www.jianshu.com/p/564c8b352c7f

pip安装第三方的库：

目标的cmd窗口，依次输入以下命令：

pip install opencv-python

pip install --upgrade setuptools

pip install numpy Matplotlib

pip install opencv-python

如果多次下载失败，可以从http://www.lfd.uci.edu/~gohlke/pythonlibs/直接下载whl包安装，安装whl包依然使用pip：更改下载源，保证网速的稳定性

pip install 包的位置(如：C:\download\xxx.whl)

示例代码：读入一副图像，按’s’键保存后退出，其它任意键则直接退出不保存：

import cv2 as cv

img = cv.imread('D:\python\test.jpg',cv2.IMREAD_UNCHANGED)

cv.imshow('image',img)

k = cv.waitKey(0)

if k == ord('s'):

    # wait for 's' key to save and exit

        cv.imwrite('1.png',img)

        cv.destroyAllWindows()

else:

        cv.destroyAllWindows()

需要注意的是，由于历史遗留问题，opencv采用BGR模式，而不是RGB

项目网页https://blog.csdn.net/qq_41562704/article/details/88975569?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160056797119725247413693%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=160056797119725247413693&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_click~default-2-88975569.pc_ecpm_v3_pc_rank_v3&utm_term=%E6%89%8B%E5%8A%BF%E8%AF%86%E5%88%AB&spm=1018.2118.3001.4187%20%14%14[17|6|%E6%89%93%E9%94%AE%E7%9B%98]%202020/9/20%2010:39:23%20git%20clone%20https://github.com/creationix/nvm.git%20~/.nvm%20&&%20cd%20~/.nvm%20&&%20git%20checkout%20`git%20describe%20--abbrev=0%20--tags`

mac 下python pip

安装，打开终端输入：

curl https://bootstrap.pypa.io/get-pip.py | python3

pip下载速度慢，更换源

sudo pip install -i https://pypi.tuna.tsinghua.edu.cn/simple tensoflow

或者https://www.cnblogs.com/chenprice/p/13509047.html

pip的升级：

pip install --upgrade pip

OpenCV：mac上安装和配置

https://www.jianshu.com/p/564c8b352c7f

opencv ：

        python:https://blog.csdn.net/shenxiandashu/article/details/78485083

python-opencv入门：

        https://www.cnblogs.com/silence-cho/p/10926248.html

        https://www.cnblogs.com/sen-c7/p/11171242.html