Thursday, June 27, 2013

QR Codes

QR Codes were created in 1994 to track trucks during manufacting by Denso Wave; which is a subsidiary of Toyota. This pictoral two dimensional matrix barcode is comprised of binary alphanumeric Japanese symbols written in Chinese called Kanji; made up of multiple interwoven error correction blocks where data is placed from right to left in a zigzag pattern. Storage capacity is affected by high error correction. Four bit indicators are used to convey other information and to select the encoding mode. Japanese passports are encoded with a QR Code containing a 56 bit algorithm used for encoding visas.
Discussion D in 2011 was the last HICAP lesson on QR Codes. The author is revisiting this subject because QR is more popular than ever and showing up in magazine ads, on billboards, almost everywhere.
QR means quick response. The way to use these codes is to point your smart phone camera eye at the code to engage and the target url will automatically be uploaded to your device. Fun, right!

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