OpenCV installation (python 3.5, opencv 3.4.4)

OS: Ubuntu18.04

1. linux update

apt install update

apt install upgrade

2. Install packages, libraries for opencv

[developers tool]

sudo apt-get install build-essential cmake unzip pkg-config

[Image I/O]

sudo apt-get install libjpeg-dev libpng-dev libtiff-dev

[Video I/O]

sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev

sudo apt-get install libxvidcore-dev libx264-dev

[GTK library]

sudo apt-get install libgtk-3-dev

[openCV function optimization library]

sudo apt-get install libatlas-base-dev gfortran

[python header & library]​

sudo apt-get install python3-dev

3. Install openCV (version: 3.4.4)

[Download official opencv & opencv_contrib module]

cd ~

wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.4.zip

wget -O opencv_contrib.zip ttps://github.com/opencv/opencv_contrib/archive/3.4.4.zip

[upzip]

unzip opencv.zip

unzip opencv_contrib.zip

[Change directory: optional]

mv opencv-3.4.4 opencv

mv opencv_contrib-3.4.4 opencv_contrib

3. Compile

cd opencv

mkdir build

cd build

[Compile option settings]

cmake -D CMAKE_BUILD_TYPE=RELEASE \

-D CMAKE_INSTALL_PREFIX=$cwd/installation/OpenCV-"$cvVersion" \

-D INSTALL_C_EXAMPLES=ON \

-D INSTALL_PYTHON_EXAMPLES=ON \

-D WITH_TBB=ON \

-D WITH_V4L=ON \

-D OPENCV_PYTHON3_INSTALL_PATH=$cwd/OpenCV-$cvVersion-py3/lib/python3.5/site-packages \

-D WITH_QT=ON \

-D WITH_OPENGL=ON \

-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \

-D BUILD_EXAMPLES=ON ..

[Compile: work number<=number of cores]

make -j4

[install]

sudo make install

[Installation check: version check]

pkg-config --modversion opencv