Detailed explanation of the correct way to install opencv on ubuntu

This article describes how to install opencv with C++ interface under Ubuntu

1. Installation preparation:

1.1 Install cmake

sudo apt-get install cmake

1.2 Dependency Environment

sudo apt-get install build-essential libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev
sudo apt-get install libgtk2.0-dev
sudo apt-get install pkg-config

1.3 Download opencv

Download address: https://opencv.org/releases/
Click Sources to download the version you need

2. Installation

2.1 Unzip the file

After decompression, put the folder where you like. I put it under home.

2.2 Enter the unzipped folder

(Here I rename the unzipped folder to opencv3, this is random and not the point)
Create a new build folder under the opencv3 folder

mkdir build

Enter the build folder

cd build

2.3cmake

sudo cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

Next is a long waiting process, which may take about 10 minutes. Don't worry, just be patient...

2.4 Compile

sudo make -j8
You can use sudo make -j 8, sudo make -j4, sudo make 
I use sudo make -j 8 here. 

2.5 Install

sudo make install

3. Configure the environment

Open /etc/ld.so.conf with gedit
Add a line to the file /usr/loacal/lib
Where /user/loacal is the opencv installation path, which is also the installation path specified in the makefile

sudo gedit /etc/ld.so.conf 

Run sudo ldconfig,
Modify bash.bashrc file

sudo gedit /etc/bash.bashrc 

Add to the end of the file:

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH 

Then enter in the command line

source /etc/bash.bashrc

4. Inspection

Enter the following command in the command line:

pkg-config opencv --modversion

At this point, the installation of opencv is complete

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