OpenCV

install-opencv3.3.1-ubuntu-16.04.sh

#!/bin/sh

# Open CV 3.3.1 on Ubuntu 16.04


sudo apt-get -y install libtiff5-dev
 
sudo apt-get -y install libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev
sudo apt-get -y install libxine2-dev libv4l-dev
sudo apt-get -y install libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev
sudo apt-get -y install qt5-default libgtk2.0-dev libtbb-dev
sudo apt-get -y install libatlas-base-dev
sudo apt-get -y install libfaac-dev libmp3lame-dev libtheora-dev
sudo apt-get -y install libvorbis-dev libxvidcore-dev
sudo apt-get -y install libopencore-amrnb-dev libopencore-amrwb-dev
sudo apt-get -y install x264 v4l-utils
sudo apt-get install -y gcc-5 g++-5

## Optional
sudo apt-get -y install libprotobuf-dev protobuf-compiler
sudo apt-get -y install libgoogle-glog-dev libgflags-dev
sudo apt-get -y install libgphoto2-dev libeigen3-dev libhdf5-dev doxygen

# download opencv-3.3.1
wget https://github.com/opencv/opencv/archive/3.3.1.zip -O opencv-3.3.1.zip
unzip opencv-3.3.1.zip

# download opencv_corntib-3.3.1
wget https://github.com/opencv/opencv_contrib/archive/3.3.1.zip -O opencv_contrib-3.3.1.zip
unzip opencv_contrib-3.3.1.zip

cd opencv-3.3.1
mkdir release
cd release

# compile and install
export CC=/usr/bin/gcc-5
export CXX=/usr/bin/g++-5
cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D INSTALL_C_EXAMPLES=ON \
      -D INSTALL_PYTHON_EXAMPLES=ON \
      -D WITH_TBB=ON \
      -D WITH_V4L=ON \
      -D WITH_QT=ON \
      -D WITH_OPENGL=ON \
      -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.3.1/modules \
      -D BUILD_EXAMPLES=ON ..
     
# Build with half of your cores, still can use computer
make "-j$(expr `nproc` / 2 )"
# Build with all cores, probablity can't use your computer...
# make "-j$(nproc)"

sudo make install
sudo sh -c 'echo "/usr/local/lib" >> /etc/ld.so.conf.d/opencv.conf'
sudo ldconfig

Awesome! I think I have it installed properly but when I test a demo I keep getting (putty)

QXcbConnection: Could not connect to display
Aborted (core dumped)

I can see the results from my "rotate" demo in text:

[[ 0.8660254 -0.5 162.29749663]
[ 0.5 0.8660254 -93.70250337]]

but it gets dumped after. I'm thinking if its because I am using putty to access my virtual server on Digital Ocean and that putty is text based and can't display graphics. I don't want to mess with the install because if might be fine as is, so I'm trying to find a solution that allows for testing with a graphical result (as it should be).

Any ideas?