Install OpenCV on Ubuntu 19.10 with MiniConda

install_opencv_from_source.sh

#!/usr/bin/env bash

# Thanks to:
# https://linuxize.com/post/how-to-install-opencv-on-ubuntu-18-04/
# https://pydeeplearning.com/opencv/install-opencv3-with-anaconda-python3-6-on-ubuntu-18-04/`

python --version >/dev/null 2>&1 || { echo >&2 "I require python@3 environment but it's not installed. ¯\_(ツ)_/¯ Aborting."; exit 1; }
conda --version >/dev/null 2>&1 || { echo >&2 "I require conda utility but it's not installed. ¯\_(ツ)_/¯ Aborting."; exit 1; }
pip --version >/dev/null 2>&1 || { echo >&2 "I require pip packagem amaner but it's not installed. ¯\_(ツ)_/¯ Aborting."; exit 1; }

clear

echo "\nCreate a Conda environment"

conda create -n py37 python=3.7.5
conda activate py37
	
echo "\nInstall dependencies"

pip install numpy
pip install tesserocr
pip install pylint
pip install FLAKE8_EXECUTABLE

sudo apt -y remove x264 libx264-dev

sudo apt-get update
sudo apt-get check

sudo apt install -y \ 
		build-essential \
		cmake \ 
		git \
		pkg-config \
		libgtk-3-dev \
		libavcodec-dev \
		libavformat-dev \
		libswscale-dev \
		libv4l-dev \
		libxvidcore-dev \
		libx264-dev \
		libjpeg-dev \
		libpng-dev \
		libtiff-dev \
		gfortran \
		openexr \
		libatlas-base-dev \
		python3-dev \
		python3-numpy \
		libtbb2 \
		libtbb-dev \
		libdc1394-22-dev

sudo apt-get install -y \
		libgstreamer1.0-0 \
		gstreamer1.0-plugins-base \ 
		gstreamer1.0-plugins-good \
		gstreamer1.0-plugins-bad \
		gstreamer1.0-plugins-ugly \ 
		gstreamer1.0-libav \
		gstreamer1.0-doc \
		gstreamer1.0-tools \
		gstreamer1.0-x \
		gstreamer1.0-alsa \ 
		gstreamer1.0-gl \
		gstreamer1.0-gtk3 \
		gstreamer1.0-qt5 \
		gstreamer1.0-pulseaudio


sudo apt-get install -y \
		ccache \ 
		libhdf5-serial-dev \
		libogre-1.9-dev \
		libopenblas-base \
		libopenblas-dev \
		tesseract-ocr \
		libtesseract-dev \
		libgflags-dev

echo "\nDownload and install from source"

mkdir ~/opencv_build && cd ~/opencv_build
pwd
git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git
cd ~/opencv_build/opencv
mkdir build && cd build

cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_GENERATE_PKGCONFIG=YES \
    -D OPENCV_EXTRA_MODULES_PATH=~/opencv_build/opencv_contrib/modules \
    -D PYTHON_EXECUTABLE=~/miniconda3/envs/py37/bin/python \
    -D BUILD_EXAMPLES=ON ..

# run $> nproc to know your number of available processors 
make -j8
sudo make install
sudo ldconfig

echo "\nUpdate module symlinks"

# SO Module compiled
cd /usr/local/lib/python3.7/site-packages/
sudo cp cv2/python-3.7/cv2.cpython-37m-x86_64-linux-gnu.so cv2.so

# Link in Conda base Python environment (optional)
#cd ~/miniconda3/lib/python3.7/site-packages
#ln -s /usr/local/lib/python3.7/site-packages/cv2.so cv2.so

# Link in Conda reciently created Python environment
cd ~/miniconda3/envs/py37/lib/python3.7/site-packages
ln -s /usr/local/lib/python3.7/site-packages/cv2.so cv2.so

echo "\nCheck installation"

pkg-config --modversion opencv4
python3 -c "import cv2; print(cv2.__version__)"