1. 安装python3（Windows）

Python Releases for Windows | Python.org

选择最新的版本也行 。由于之前安装过，就不再重复了，注意环境变量是否有写入。

2. 安装numpy、matplotlib、opencv-python

安装命令：

python -m pip install numpy matplotlib opencv-python

命令行输出：

安装完毕，提示需要升级pip

python -m pip install --upgrade pip

当前的版本是21.1.1，升级到24.3.1

安装成功，命令行打印如下：

Requirement already satisfied: pip in d:\program files\python38-32\lib\site-packages (21.1.1)
Collecting pip
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x04C56F10>, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/ef/7d/500c9ad20238fcfcb4cb9243eede163594d7020ce87bd9610c9e02771876/pip-24.3.1-py3-none-any.whl
  Downloading pip-24.3.1-py3-none-any.whl (1.8 MB)
     |████████████████████████████████| 1.8 MB 467 kB/s
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 21.1.1
    Uninstalling pip-21.1.1:
      Successfully uninstalled pip-21.1.1
Successfully installed pip-24.3.1

3. 运行OpenCV例子

下载VSCODE，在VSCODE中加入python插件：

然后创建文件，编写py代码：

import cv2

img = cv2.imread('D:\\resource\\daji.png')

cv2.imshow('img', img)
cv2.waitKey(0)

点击运行：

运行后：