linux Installation Configuration: opencv3.4.6 + opencv3.4.6

Website: https://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html
[official website, look at this if you have any questions]

Reference: https://blog.csdn.net/qq_37027117/article/details/89163596
This brother has helped me a lot, but I have some problems when I carry out some detailed steps, so there will be many differences.

opencv

1. Download the specified version of opencv for linux

https://github.com/opencv/opencv/releases

Generally speaking, github is slow to hang up a ladder and download quickly.

2. Put it into the server or computer target directory to decompress

To the corresponding directory

unzip 3.4.6.zip

Entry directory

cd opencv-3.4.6

Create a folder called build

mkdir build

3. cmake

Go into the folder

cd build

Configure cmake

cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local/opencv346 -DPYTHON_DEFAULT_EXECUTABLE=$(which python3) -DWITH_TBB=ON -D WITH_EIGEN=ON ..

The main function is to configure, generate output and files to the specified location.
(- D should not be followed by a space, otherwise there will be an error that the directory cannot be found.)

4. make instruction

sudo make

sudo make install

This instruction can improve the execution speed of make on multi-core host and allow 7 parallel tasks at the same time

make -j7

(here is the original words on the official website)

5. Generate files

Enter doc folder

cd doc

make -j7 doxygen

6. Configure environment variables

Switch to superuser

sudo su

Modify the configuration with the privileges of super user

vi /etc/ld.so.conf.d/opencv.conf

Add at the end of the file: / usr/local/opencv346/lib (possibly an empty file)

Open vim again

vi /etc/bash.bashrc

Add at the end of the file:

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/opencv346/lib/pkgconfig export PKG_CONFIG_PATH

Restart the terminal after configuration to make the configuration effective.
Or perform:

source /etc/bash.bashrc sudo updatedb

You can check whether the installation is successful. If it is successful, the following is displayed

ldconfig -v | grep opencv

opencv_contrib-3.4.6

Website: https://github.com/opencv/opencv_contrib/releases

The same process, unzip to the "opencv-3.4.6" folder.

cd build

cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local/opencv346 -DPYTHON_DEFAULT_EXECUTABLE=$(which python3) -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-3.4.6/modules -DWITH_TBB=ON -DWITH_EIGEN=ON ..

(because the location of python3 in my server has been changed, so I write as follows)

cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local/opencv346 -DPYTHON_DEFAULT_EXECUTABLE=$(which /usr/bin/python3) -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-3.4.6/modules -DWITH_TBB=ON -DWITH_EIGEN=ON ..