QR stands for Quick Response. QR codes are two dimensional bar codes that have become very popular and more so with each passing day - thanks to the smart phones and decoder apps. Denso Wave, which is a subsidiary of Toyota, created this in 1994 to track vehicles during the manufacturing process
The QR code shown represents the URL: https://www.codewalk.com
If you point a smart phone at the QR code shown, any QR code reader (say Kaywa) can read the code and redirect to the URL. The popularity of the smart phone is making QR codes easy to use for everyone.
QR codes are becoming very popular because:
- Fast readability
- Large storage capacity
- Versatile - can be used on many different kinds of data
- QR code is an ISO standard and free of cost
- QR decoders are available in smart phones.
Error Correction and Art
QR codes have error correction using which it is possible to create artistic QR codes that still scan correctly, but contain intentional errors to make them more readable or attractive to the human eye, as well as to incorporate colors, logos and other features into the QR code block
Art Bouvier made use of the error correcting features of the code to create visually appealing QR codes such as the one shown next. This color QR Code features the Indianapolis City Market; https://www.indycm.com/qr1.
Credit: QR Artist.