opencv-pi.sh

sudo apt-get update
sudo apt-get -y dist-upgrade
sudo apt-get install screen
sudo apt-get install htop
sudo apt-get purge wolfram-engine
sudo apt-get purge libreoffice*
sudo apt-get clean
sudo apt-get autoremove
sudo apt-get install build-essential cmake pkg-config
sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng12-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 libgtk2.0-dev libgtk-3-dev
sudo apt-get install libatlas-base-dev gfortran
sudo apt-get install python2.7-dev 
sudo apt-get install python3-dev
wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.1.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/3.4.1.zip
unzip opencv.zip
unzip opencv_contrib.zip
wget -O get-pip.py https://bootstrap.pypa.io/get-pip.py 
sudo python get-pip.py
sudo python3 get-pip.py
sudo pip install numpy scipy
cd ~/opencv-3.4.1/
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
    -D BUILD_EXAMPLES=ON ..

sudo nano /etc/dphys-swapfile
CONF_SWAPSIZE=1024
sudo /etc/init.d/dphys-swapfile restart
make -j4
sudo make install
sudo ldconfig
sudo apt-get update
cd /usr/local/lib/python3.5/site-packages/
sudo mv cv2.cpython-35m-arm-linux-gnueabihf.so cv2.so