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Introduction

What is QR Code?
QR Code is a matrix code (or two-dimensional bar code) created by Japanese corporation Denso-Wave in 1994.
The "QR" is derived from "Quick Response", as the creator intended the code to allow its contents to be decoded at high speed.


How Does It Work?
Data is translated into QR Code by QR Generator.
QR Code is scanned by mobile camera phone having QR
Reader Software.
Software interprets the code.
cell phone displays the text or ask for permission to launch a
browser to display the specified web page.

BACKGROUND OF QR CODE DEVELOPMENT

In 1970,IBM developed UPC symbol consisting of 12 digits of no:
The Universal Product Code (UPC) is a linear barcode that is widely used  for tracking trade items in stores.
In 1974,Code 39 which can encode approx 30 digits of alphanumeric characters was developed
Later it led to the development of Code 128,which can encode full ASCII
In early 1980s,Multistage symbols were developed, it can encode 100 digits of characters. Egs are Code 16K and code 49.
In 1994,Multirow symbols were developed by extending multistage symbols and into matrix symbols where data were arranged in matrix.
This matrix code is QR Code, contains 7000 digits of characters at max including Kanji characters.

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