OpenCV 4.0 , Ubuntu 18.04 Installation

OpenCV 4.0 , Ubuntu 18.04 Installation

git clone --recursive https://github.com/opencv/opencv_contrib.git
git clone --recursive https://github.com/opencv/opencv.git

Make sure the CmakeCache params are loaded (refer the one in gist), in cmake-gui

make -j8 install
sudo ldconfig


Note: This might not setup python opencv version correctly. It initially showed me 3.2 when I did
cv2.__version__

cd opencv/opencv/build/python_loader

sudo python3 setup.py build
sudo python3 setup.py build install --prefix=/usr/local

sudo link the .so file in /usr/local/python/cv2/python-3.6
sudo ln -s cv2.cpython-36m-x86_64-linux-gnu.so cv2.so

Add following line in bashrc which contains the cv2.so (opencv 4 lib)
export PYTHONPATH=$PYTHONPATH:/usr/local/python/cv2/python-3.6

source ~/.bashrh

now open a fresh terminal to check

import cv2
cv2.__version__

This should print out the following
'4.0.0-dev'