https://upload.wikimedia.org/wikipedia/commons/8/8f/Qr-2.png https://pythonhosted.org/PyQRCode/index.html https://www.thonky.com/qr-code-tutorial/ http://web.archive.org/web/20140331040112/http://qrbcn.com/imatgesbloc/Three_QR_Code.pdf
https://www.wikiwand.com/en/QR_code#/Decoding_example
https://www.youtube.com/watch?time_continue=9&v=KA8hDldvfv0
ISO 18004:2015