openqrcode
Read a damaged QR code: data as squares, check digits and error-correcting codes.
- Session 1: Squares of data and the check digit (Level 1, 60 min)
- Session 2: Parity bits and the Hamming(7,4) code (Level 2, 75 min)
- Session 3: A toy matrix code, damaged and repaired (Level 3, 90 min)