QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan.
A barcode is a machine-readable optical label that contains information
about the item to which it is attached. A QR code uses four
standardized encoding modes (numeric, alphanumeric, byte / binary, and kanji) to efficiently store data; extensions may also be used.
The QR Code system became popular outside the automotive industry due
to its fast readability and greater storage capacity compared to
standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, and general marketing.
A QR code consists of black modules (square dots) arranged in a
square grid on a white background, which can be read by an imaging
device (such as a camera) and processed using Reed–Solomon
error correction until the image can be appropriately interpreted. The
required data are then extracted from patterns present in both
horizontal and vertical components of the image.
(Source: http://en.wikipedia.org/wiki/QR_code)
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