Install Opencv 3.x

#!/bin/sh
sudo apt-get update
sudo apt-get -y install build-essential cmake git pkg-config python-dev
sudo apt-get -y install libjpeg-dev libtiff5-dev libjpeg8-dev libjasper-dev libpng12-dev
sudo apt-get -y install libgtk2.0-dev
sudo apt-get -y install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get -y install libatlas-base-dev gfortran libxvidcore-dev libx264-dev

sudo pip install numpy
git clone https://github.com/opencv/opencv
cd opencv
git checkout 3.3.0
cd ..
git clone https://github.com/opencv/opencv_contrib
cd opencv_contrib
git checkout 3.3.0
cd ..
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 -j4
sudo make install
sudo ldconfig