Key takeaways
- A two-dimensional code for quick links, contacts, Wi‑Fi.
- Up to ~4296 characters, damage resistance up to ~30%.
- Read by a smartphone camera without a special scanner.
QR (Quick Response) — a two-dimensional barcode: information is read by a phone camera.
What is a QR code?
A modern barcode of black-and-white squares in a grid — more data than a linear code.
- Capacity: до 4 296 символов
- Speed: instant recognition
- Reliability: works with damage up to ~30%
- Versatility: text, URL, contacts, Wi‑Fi
История
- 1994: Denso Wave (Toyota) — Masahiro Hara, auto parts
- 2000: ISO/IEC 18004
- 2002: first phones with support
- 2020: mass adoption (incl. COVID)
How does it work?
- Information → binary code
- 0/1 → white/black squares
- The camera reads the grid
- The algorithm decodes it back
Example «Hello»: ASCII → binary → grid + service markers.
Structure
- Corner markers: orientation and bounds
- Alignment: distortion correction
- Synchronization: exact grid
- Данные: payload
- Error correction: recovery when damaged
Benefits
- Speed
- Ёмкость
- Reliability
- Convenience (phone camera)
- Versatility
- Economy
Usage examples
- Ритейл: menus, price tags, loyalty, orders
- Marketing: flyers, business cards, packaging — with analytics in ClikBy
- Events: registration, program, feedback