A brief introduction of QR codes

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 What is QR code?

                                                Photo of QR Code inventor Masahiro Hara. 

=> A machine-readable code consisting of an array of black and white squares, typically used for storing URLs or other information for reading by the camera on a smartphone.QR stands for "Quick Response." 

A QR code (quick response code) is a type of two dimensional (2D) bar code that is used to provide easy access to online information through the digital camera on a smartphone or tablet.A bar code reader in the camera interprets the bar code, which typically contains a link to view a webpage, send an SMS text message or call a phone number. The technology for QR codes was developed by Densa-Wave, a Toyota subsidiary. The codes were originally used for tracking inventory and required a separate reader app, but beginning with iOS 11 and Android 8.0, readers are native to most mobile device cameras.

                                                  Here is an example of what a QR code looks like:

Static QR codes, like the one above, are typically used to disseminate information to the general public. They are often displayed on posters and billboards and in ads in newspapers and magazines. The person who created the code can track information about the number of times their code was scanned and whether or not the code's call to action was taken.Dynamic QR codes (sometimes referred to as unique QR codes) offer more functionality. They can be edited at any time and even target a specific individual for personalized marketing. Such codes contain more metadata to facilitate tracking.

Who invented QR Codes?


The Point of Sale (POS) system

As a result of the growing demand for technology to lighten the burden on supermarket cashiers, a POS system was created. It was basically the newborn baby version of a Barcode that allowed for the scanning of individual items to be registered by a computer. Despite this effort, however, this still wasn’t enough. Supermarkets then faced another obstacle: Barcodes could only store up to around 20 alphanumeric characters of information and functioned with one dimension (one direction of coding).

The involvement of DENSO WAVE INCORPORATED

The invention of the QR Code can be contributed to the DENSO WAVE and their lead developer Masahiro Hara. They were contacted by supermarkets who realized the limits of these Barcodes and sought a way to make them more versatile and contain more information through the development of a 2-D Code (two directions of coding).

How do QR Codes work?

The structure of a QR Code

The modern-day QR Code consists of 7 parts. Each of these parts creates a sort of pixel pattern that looks similar to a crossword puzzle. Each element has a specific purpose that conveys certain information through the Code such as the print direction, timing, error tolerance, and empty spaces to differentiate the Code from what surrounds it. 

How to scan QR Codes

These days, the majority of QR Codes are scanned with a smartphone. There are tons of free apps for QR scanning for both Android and iOS devices(also with the camera). Most often, you simply open the app and it automatically scans the QR Code with the touch of a button. 

Conclusion:

By this paper the conclusion is that QR code store the information QR Code stores the information matrix form which stores the information on both axes horizontally or vertically. QR code has many advantages like, QR codes are free to generate and free to Scanned.

References:

Techtarget,techopedia,wikipedia,qr-code-generator,quora etc.

Written By:Raktim Bar 


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