QR codes are 2-D barcodes that can store more data than traditional 1-D barcodes. They were invented in Japan in 1994 and have become widely used to link the physical world to online information. QR codes can be scanned by the cameras on many mobile phones to open a website, display text, or other outputs. They are being used in many ways like tracking objects, displaying contact information on business cards, and linking print advertising to online content.

1. QR Codes Bridging the physical and virtual worlds with funny-looking barcodes. Tristan Roddis, Cogapp www.QRtists.com

2. What are QR codes? 2-D barcodes - more data in same space Invented in Japan in 1994 Error tolerant Alphanumeric up to 4,296 characters Support for multiple parts ISO standard Similar to: Data Matrix, Shotcode, Quick code

3. Why are they special? Because they can be decoded by mobile phones Built in to many phones (esp. Japan) Available for lots of others (http://qrtists.com/s) [insert impressive statistic about mobile phone use here]

4. Demo

5. Generating QR codes Websites Firefox extension Open source C program: qrencode PHP/CGI See list at http://qrtists.com/s

6. Uses of QR codes Tracking objects Business cards Email sigs Linking to websites Adverts

9. Source: http://www.pinktentacle.com/2007/04/movie-qr-code-and-kung-fu-high-school-girls/

11. Source: http://www.gearfuse.com/junkfood-maker-prints-qr-code-on-prawn-crackers/

12. Demo

13. Why is this more interesting? Physical location maps to virtual location Same input token provides different output (website maintains state) Users can be tracked (cookies etc.) Users provide information just by using the system (web 2.0 Holy Grail!)

14. Source: http://news.bbc.co.uk/1/hi/technology/6938244.stm

15. Parting thoughts Link up to dynamic websites Use in different situations Games Ticketing – concert example Previewing – music store example Collecting - museum example Need an open source reader!

16. Questions?