How does a QR code scanner work?

Related questions

1. Can you scan a QR code from a computer screen?
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Tags

1. #decoder
2. #phone
3. #across
4. #detects
5. #scanner
6. #sensor
7. #light
8. #illuminator
9. #decode
10. #screen
11. #reflected
12. #which
13. #convertor
14. #contains
15. #download