RaspberryPI
http://raspberrypi-aa.github.io/session4/venv.html
sudo pip install virtualenv
cd envopencvcoupe19
source bin/activate
sudo apt-get update
sudo apt-get upgrade
sudo python3 get-pip.py
sudo pip install opencv-contrib-python
sudo pip install PiCamera
python
>>> import cv2
>>> cv2.__version__
>>> from picamera import PiCamera