Python 3.4+ with OpenCV 3.1.0 Binding on Ubuntu 14.04

Python 3.4+ with OpenCV 3.1.0 Binding on Ubuntu 14.04

# I have followed PyImageSearch tutorial http://www.pyimagesearch.com/2015/07/20/install-opencv-3-0-and-python-3-4-on-ubuntu/

# Ubuntu upgrade & update current libraries
sudo apt-get update
sudo apt-get upgrade

# Install dependancies
sudo apt-get install build-essential cmake git pkg-config
sudo apt-get install libjpeg8-dev libtiff4-dev libjasper-dev libpng12-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libgtk2.0-dev
sudo apt-get install libatlas-base-dev gfortran

# Setup Python 3 ..

# Install pip
wget https://bootstrap.pypa.io/get-pip.py
sudo python3 get-pip.py

# Using virtualenv and virtualenvwrapper
sudo pip3 install virtualenv virtualenvwrapper

###############################################
# 
# export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
# export WORKON_HOME=$HOME/.virtualenvs
# source /usr/local/bin/virtualenvwrapper.sh
# 
# You have to update  ~/.bashrc  file (place at the bottom of the file): 
#################################################

# Reflecting the changes inside ~/.bashrc | you can exit and login terminal again
source ~/.bashrc

# Creating a virtual Environment for working 
mkvirtualenv cv3

# Installing python3.4-dev
sudo apt-get install python3.4-dev

#Install NumPy 
pip install numpy

#  Build and install OpenCV 3.0 with Python 3.4+ bindings
# Download Open CV 3.0.0 from source code  // Checkout Takes long time
cd ~
git clone https://github.com/Itseez/opencv.git
cd opencv
git checkout 3.1.0

# Download Open CV _contrib from source code  // Checkout Takes long time
cd ~
git clone https://github.com/Itseez/opencv_contrib.git
cd opencv_contrib
git checkout 3.1.0

# Install open CV ver 3.1 with insuring the binding with _contribute
cd ~/opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
      -D BUILD_opencv_python3=ON ..

# Build and compile the source code // Takes looooong time > ~30 minute
# I got an error here, and Its solution was to enlarge the memory size as vagrant's default memory alloc. was 256M, give it 4G
make -j4

# Installation for OpenCV
sudo make install
sudo ldconfig

## Insuring the binding between OpenCV & Python
ls -l /usr/local/lib/python3.4/site-packages/
# It would print similar to the following line 
# -rw-r--r-- 1 root staff 1893192 May 18 12:20 cv2.cpython-34m.so

cd ~/.virtualenvs/cv3/lib/python3.4/site-packages/
ln -s /usr/local/lib/python3.4/site-packages/cv2.cpython-34m.so cv2.so


# For Testing the Environment setup
workon cv3
python
# /** Python Code -----
>>> import cv2
>>> cv2.__version__
'3.1.0'
# Python Code ----- **/