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Opencv environment construction (I)

2022-07-04 08:56:00 【Brother Lei talks about programming】

This environment is built OpenCV Of python（ For short py） Development environment construction , Based on the py3 Environment and syntax .

windows System building

System environment ：windows 10 + python 3.6 + OpenCV 3.4.1

One 、 install python

python Before the installation of python Self study notes The project described , Don't repeat here , Friends in need , Click to see ： python Environmental installation

Two 、 install numpy modular

According to the above tips , Now we have installed it correctly python and pip（ Installation and management python Package tools ）, In formal installation OpenCV Before , First we need to install numpy modular . numpy： Is a language extension that defines numeric array and matrix types and their basic operations ,OpenCV Refer to the numpy modular , So install OpenCV Must be installed before numpy.

This article installs python The module uses .whl File installed .

whl What is the file ？

whl It's a python The package , Which includes py Files and compiled pyd file .

whl Installation command

pip install Storage path \xxx.whl

Back to the topic , We are going to install numpy Modular .

First go to the website to download the corresponding numpy edition , Download address ： https://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy I am a 64 For the system python3.6 So the corresponding latest version is ：numpy‑1.14.2+mkl‑cp36‑cp36m‑win_amd64.whl, Click download to D: root directory .

The first 2 Step , Start the command form to run

pip install d:\numpy‑1.14.2+mkl‑cp36‑cp36m‑win_amd64.whl

The command form displays ：

Processing d:\numpy-1.14.2+mkl-cp36-cp36m-win_amd64.whl

Installing collected packages: numpy

Successfully installed numpy-1.14.2+mkl

The installation is successful .

3、 ... and 、 install OpenCV

Also install OpenCV Module and numpy Similar way , Download from the website OpenCV For the .whl Version pack , website ： https://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv The version I downloaded is ：opencv_python‑3.4.1‑cp36‑cp36m‑win_amd64.whl 64 Bit system corresponds to python3.6 Of , Download to d Packing list .

The first 2 Step , Start the command form to run

pip install d:\opencv_python-3.4.1-cp36-cp36m-win_amd64.whl

Form display ：

Processing d:\opencv_python-3.4.1-cp36-cp36m-win_amd64.whl

Installing collected packages: opencv-python

Successfully installed opencv-python-3.4.1

Description installation successful .

Four 、 function OpenCV

Here we are , Our environment configuration has been completed , Finally, it's time to roll up the code , Think of a little excitement .

       
        import cv2
        

        
print(cv2.__version__)
        

        
#  Output ：3.4.1
       
       
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        5.

Above we simply print OpenCV Version number of , If it can output normally, no error will be reported , It means that we have OpenCV Of python Environment building ok 了 .

what ？ It doesn't feel good yet , Let's draw a picture , use OpenCV Show it , The code is as follows ：

       
        import cv2
        

        
filepath = "img/meinv.png"
        
img = cv2.imread(filepath)
        
cv2.namedWindow('Image')
        
cv2.imshow('Image', img)
        
cv2.waitKey(0)
        
cv2.destroyAllWindows()
       
       
        1.
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        5.
        6.
        7.
        8.

OpenCV Environment building （ One ）_linux

Linux Build version environment

>Ubuntu 18.04

>Python 3.6.5

>Pip 10.0.1

>Numpy 1.14.3

>OpenCV 3.4.0

Ubuntu One advantage is built-in Python Environmental Science , No need to be like Windows That's for Python The environment is tossed , But here's the thing Ubuntu It comes with itself apt-get And installed pip The data source of is foreign , So it's very slow to use , Must put apt-get and pip Replace the data source with domestic , Please move to ：[《Ubuntu apt-get and pip Source replacement 》](http://www.cnblogs.com/vipstone/p/9038023.html)

### The formal installation ###

According to the tips above , You have configured the development environment , Now it needs to be officially installed , Of course Ubuntu The installation of is also better than Windows Simple a lot , Just use pip Installation package , Install the corresponding module .

#### install Numpy ####

Use command ：pip3 install numpy

Use command ：python3, Get into python Script execution environment , Enter the code to view numpy Is the installation successful , as well as numpy Installation version of ：

```

import numpy

numpy.__version__

```

Enter the version number normally , Proof of successful installation .

Pictured ：![](http://icdn.apigo.cn/numpy-setup-success.png)

#### install OpenCV ####

OpenCV Is installed in Ubuntu and numpy be similar , Use command ：

>pip3 install opencv-python

Use command ：python3, Get into python Script execution environment , Enter the code to view OpenCV edition ：

```

import cv2