[RPi] QRCode

先安裝必要套件

$ sudo apt-get install -y python-dev python-opencv python-pip python-numpy libzbar-dev zbar-tools qrencode python-zbar
$ sudo pip install pathlib numpy Pillow

https://gist.github.com/mohankumargupta/243aeb6787123cc17f1c10338bd4a82f