Create your own invisible watermark
yarn install
npm start
sudo apt install -y build-essential cmake git pkg-config
sudo apt install -y libjpeg8-dev libtiff4-dev libjasper-dev libpng12-dev
# For GUI
# sudo apt install -y libgtk2.0-dev
sudo apt install -y libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt install -y libatlas-base-dev gfortran
# install pip
sudo apt install python-pip
sudo apt install python2.7-dev
# !!!!!!!
# Download opencv, opencv_contrib
# !!!!!!!
cd ~/opencv/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
sudo pip install matplotlib
sudo apt install -y python-tk