uses and project

the easiest way to install OpenCV for python in Raspberry pi

sudo apt-get install libhdf5-dev libhdf5-serial-dev libhdf5-100 sudo apt-get install libqtgui4 libqtwebkit4 libqt4-test sudo apt-get install libatlas-base-dev sudo apt-get install libjasper-dev wget https://bootstrap.pypa.io/get-pip.py sudo python3 get-pip.py sudo pip3 install opencv-python==3.4.6.27

or try

sudo pip3 install opencv-contrib-python==3.4.6.27