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QR Code
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The QR Code (Quick Response Code) is a 2-dimensional matrix code.  It can encode up to 2509 numeric or 1520 alphanumeric characters and offers three levels of error detection.  The smallest QR Code measures 21 X 21 cells (each cell encodes one bit) and can grow in increments of 4 cells to a maximum size of 105 X 105 cells.  The squares in the bottom left, top left, and top right corners are locator patterns.

The QR Code was developed in Japan by the Nippondenso Company; it was introduced in 1994 at the Japan Scan-Tech show and was submitted to AIM for consideration as a standard in 1996.


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