Install OpenCV 4.1.1 using Python3.5 in Ubuntu 16.04

Hi all

I am sharing tried and tested steps for installation of latest version of OpenCV using Python3.5 in Ubuntu 16.04. Python3.5 is installed by default in Ubuntu 16.04.

sudo apt update
sudo apt upgrade

sudo apt-get install build-essential

sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

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

sudo apt-get install libxvidcore-dev libx264-dev

sudo apt-get install libgtk-3-dev

sudo apt-get install libatlas-base-dev gfortran

sudo apt-get install python2.7-dev python3.5-dev

wget -O opencv.zip https://github.com/opencv/opencv/archive/4.1.1.zip

unzip opencv.zip

wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.1.1.zip

unzip opencv_contrib.zip

sudo apt-get install python-pip && pip install --upgrade pip

sudo python -m pip uninstall pip && sudo apt install python-pip --reinstall 

sudo pip install virtualenv virtualenvwrapper

sudo rm -rf ~/.cache/pip

nano .bashrc

Add following lines:

# virtualenv and virtualenvwrapper

export WORKON_HOME=$HOME/.virtualenvs

source /usr/local/bin/virtualenvwrapper.sh

source ~/.bashrc

mkvirtualenv py3cv4 -p python3

x

pip install numpy

cd ~/opencv-4.1.1/

mkdir build

cd build

cmake -D BUILD_TIFF=ON -D WITH_CUDA=OFF -D ENABLE_AVX=OFF -D WITH_OPENGL=OFF -D WITH_OPENCL=OFF -D WITH_IPP=OFF -D WITH_TBB=ON -D BUILD_TBB=ON -D WITH_EIGEN=OFF -D WITH_V4L=OFF -D WITH_VTK=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_PYTHON_EXAMPLES=ON -D INSTALL_C_EXAMPLES=ON -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-4.1.1/modules -D PYTHON_EXECUTABLE=~/.virtualenvs/py3cv4/bin/python -D BUILD_EXAMPLES=ON ..

make -j4 (for core i3 system)

sudo make install

sudo ldconfig

cd /usr/local/lib/python3.5/site-packages/

cd cv2

cd python-3.5/

sudo mv cv2.cpython-35m-x86_64-linux-gnu.so cv2.so

(py3cv4) abhi@ubuntu:~$ cd ~/.virtualenvs/py3cv4/lib/python3.5/site-packages/

(py3cv4) abhi@ubuntu:~$ ln -s /usr/local/lib/python3.5/site-packages/cv2/python-3.5/cv2.so cv2.so

To move out from Virtual environment, type "deactivate". To switch inside virtual environment, type "workon py3cv4".

To test proper installation of OpenCV in Ubuntu, open terminal, activate python interpreter and type commands:

$python

>>import cv2

>>cv2.__version__

'4.1.1'

Hope it helps. Keep learning!