OpenCV 3.4.2 Raspberry Pi Python build

rpi-opencv-python-build.sh

#!/bin/bash
set -ex

# Adapted from https://raspberrypi.stackexchange.com/a/69176

version=3.4.2

mkdir build
cd build

# Install dependencies
sudo apt-get update
sudo apt-get -y upgrade 
sudo apt-get -y install build-essential git cmake pkg-config libjpeg-dev libtiff5-dev \
                        libjasper-dev libavcodec-dev libavformat-dev \
                        libswscale-dev libv4l-dev libxvidcore-dev libx264-dev \
                        libgtk2.0-dev libatlas-base-dev gfortran python3-dev

git clone https://github.com/opencv/opencv.git
cd opencv
git checkout $version
cd ..

git clone https://github.com/opencv/opencv_contrib.git
cd opencv_contrib
git checkout $version
cd ..

wget https://bootstrap.pypa.io/get-pip.py
sudo python3 get-pip.py
pip install numpy
cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=OFF \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
    -D BUILD_EXAMPLES=ON ..
make
sudo make install
sudo ldconfig