Ubuntu system configuration OpenCV ---

Ubuntu system configuration OpenCV ---

table of Contents

A, Ubuntu lower with OpenCV

Two, Ubuntu with the python-opencv

Explanation

　　The above-described one, two two methods, there are still differences OpenCV arranged. According to their individual understanding of existing knowledge, " Ubuntu with OpenCV under " download system is in a opencv, OpenCV library full; " with python-opencv under Ubuntu " is a Python can call the relevant OpenCV library, OpenCV libraries incomplete, only with the python.

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A, Ubuntu lower with OpenCV

　　@https://blog.csdn.net/baidu_34971492/article/details/81665538

　　Download the installation package, perform the installation step by step.

　　(1) In Opencv official website to download OpenCV3.4.2 Sources, URL link: https: //opencv.org/releases.html, decompression.

　　(2) Installation and cmake dependent libraries.

1. Quick Install cmake (you can also download the installation package cmake installed) 
sudo APT- GET install cmake cmake # View installed version: cmake --version #https: //www.cnblogs.com/zhangjiansheng/p/7990028.html 
APT the sudo - GET Update 

2. dependencies 
the sudo APT - GET the install Build- Essential 
the sudo APT - GET . CMake the install Git libgtk2 0 -dev PKG-config with libavformat the libavcodec-dev-dev libswscale- dev 
the sudo APT - GET the install Python-dev Python dev libjpeg-libtbb2 libtbb -numpy-dev-dev the libtiff the libpng-dev-dev libdc1394- libjasper 22 is -dev

　　(3) OpenCV3.4.2 installation. (Premise has been installed cmake: sudo apt-get install cmake)

(3.1) to create a build folder
 mkdir build 
cd build 

(3.2) cmake about
 #cmake = -D CMAKE_BUILD_TYPE Release CMAKE_INSTALL_PREFIX = -D / usr / local .. 
#cmake -D CMAKE_BUILD_TYPE the RELEASE = -D CMAKE_INSTALL_PREFIX = ~ / OpenCV-3.4. . 1 / build / OFF = Installed -DWITH_CUDA ..   (established opencv-3.4.1 / build / installed these folders )    
CMake = -D CMAKE_BUILD_TYPE Release CMAKE_INSTALL_PREFIX = -D / usr / local / opencv3.4.2 .. 

Note: If you have compiled in a new folder, but will appear before an error, then compile the cmakecache.txt deleted can 
not error, continue. . . 

(3.3) make it
 sudo make
after sudo make install # completes OpenCV compilation process is over

(3.4) to configure some of OpenCV build environment
 The first step: the system environment 
1. First, add the path to the OpenCV library, which allows the system to find: 
sudo gedit /etc/ld.so.conf.d/opencv.conf 

2. only need to add at the end of the file: 
/ usr / local / lib   

3. makes the configuration path just to take effect: 
sudo ldconfig 

Step Two: configure bash 
1. open bash.bashrc
 sudo gedit /etc/bash.bashrc # sudo gedit ~ /. bashrc

 2. Add the rearmost 
# @ multivariate OpenCV switching https://blog.csdn.net/learning_tortosie/article/details/80594399 
#export PKG_CONFIG_PATH = ~ / opencv- 3.4. . 1 / Build / Installed / lib / the pkgconfig 
# the LD_LIBRARY_PATH = ~ Export / opencv- 3.4. . 1 / Build / Installed / lib

PKG_CONFIG_PATH = Export /usr/local/opencv3.4.2/lib/pkgconfig 
Export the LD_LIBRARY_PATH = /usr/local/opencv3.4.2/lib 

3. validate the configuration 
Source Source # /etc/bash.bashrc ~ / .bashrc 

(3.5 of) the query OpenCV version
 pkg-config --modversion opencv # 3.4.2 If the output, it indicates that the configuration is successful. If the preceding is not an error, the output is not 3.4.2, may not be configured to take effect, restart the computer

也可以：@https://blog.csdn.net/cocoaqin/article/details/78376382
配置.bashrc

 echo '/usr/local/lib' | sudo tee -a /etc/ld.so.conf.d/opencv.conf    
 sudo ldconfig    
 printf '# OpenCV\nPKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig\nexport PKG_CONFIG_PATH\n' >> ~/.bashrc    
 source ~/.bashrc

　　(4) OpenCV3.4.2 test installation was successful

　　Test 1:

　　cd to opencv3.4.2 / samples / cpp / under example_cmake directory, the directory has been given an official of cmake example, can be used to test, performed in this order: