tchamberlin/opencv_odroid_ubuntu_18.04.md

## opencv_odroid_ubuntu_18.04.md

      
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              opencv_odroid_ubuntu_18.04.md
            
          
    Install Python3.8 and OpenCV on ODROID N2 Ubuntu 18.04

Ubuntu 18.04

This guide uses the "minimal" (headless) Ubuntu installation.
ODROID provides images for Ubuntu 18.04 here
This guide is using build 20190806
Download this and flash it to a MicroSD card. I couldn't find an md5 for it, but it worked for me, and the sum for mine is 25d47739748c23109c218cfdca4e3ffd.
First boot

Ensure the white switch is set to MMC (right-position). Then simply plug in the MicroSD card, turn on the ODROID, and Ubuntu should start up.
Default username/password is root/odroid.
SSH

I would recommend doing the rest of this via SSH, but it's up to you. From another linux host, use ssh-copy-id to get your credentials over, and then SSH in
Software Installs

apt update -y && apt full-upgrade -y
apt install python3.8 python3.8-dev python3.8-venv python3-pip
Set up a virtual environment for OpenCV:
mkdir ~/venvs
python3.8 -m venv ~/venvs/3.8_env
source ~/venvs/3.8_env/bin/activate
Now we need to install the dependencies for OpenCV:
apt install libatlas-base-dev gfortran
pip install numpy
There's not pre-built binaries for ARM (as far as I can tell), so we'll need to build them ourselvs. Note that we are turning off the GUI features -- it's a headless installation, after all.
mkdir ~/opencv
cd ~/opencv
# Get latest OpenCV source
wget https://github.com/opencv/opencv/archive/4.2.0.tar.gz
tar -xf ./4.2.0.tar.gz 
cd opencv-4.2.0
mkdir build
cd build
# Turn examples and GUI off to save time (probably wouldn't work anyway)
cmake \
    -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=OFF \
    -D INSTALL_PYTHON_EXAMPLES=OFF \
    -D BUILD_EXAMPLES=OFF \
    -DWITH_QT=OFF \
    -DWITH_GTK=OFF \
    ../
# ~45 minutes
make -j6 # We have 6 cores, so why not
make install
ldconfig
ln -s /usr/local/lib/python3.8/site-packages/cv2/python-3.8/cv2.cpython-38-aarch64-linux-gnu.so /usr/local/lib/python3.8/site-packages/cv2/python-3.8/cv2.so
ln -s /usr/local/lib/python3.8/site-packages/cv2/python-3.8/cv2.so $VIRTUAL_ENV/lib/python3.8/site-packages/cv2.so
# This should print out 4.2.0
python -c "import cv2; print(cv2.__version__)"