Paignton (Palace Avenue) Methodist Church

Palace Avenue, Paignton, Devon, United Kingdom

the 'QR' Code explained

 

Description: QR Code two dimensional barcode
An example of a QR Code

A QR Code (it stands for "Quick Response") is a mobile phone readable barcode that's been big in Japan for many years and has now broken into Europe.

In its simplest sense think "print based hypertext link" - an Internet address is simply encoded into the QR Code and then point a mobile phone (or other camera-enabled mobile) at it. If the device has had QR Code decoding software installed on it, it will fire up its browser and go straight to that Internet address.

But it doesn't stop there - a QR Code could also contain a phone number, an SMS message, V-Card data or just plain alphanumeric text, and the scanning device will respond by opening up the correct application to handle the encoded data appropriately courtesy of the 'Identifiers' that are embedded in the encoded data.

The technical specifications for a QR Code are set down in the ISO-18004 standard so they are the same all over the world, and the only significant variations from one QR code to another (apart from the data it contains) is the number of modules required to store the data. A Version 1 QR Code is a 21x21 array of data elements with the array increasing in size by 4 modules for each increase in version number. The largest standard QR Code is a Version 40 symbol that 177x177 modules in size and can hold up 4296 characters of alphanumeric data (theoretically) compared to 25 characters for a Version 1 QR Code.

To make things a bit more robust, the QR Code also contains its own error correction data, internal orientation calibration and self-alignment markers. In this way it doesn't matter whether the QR code is upside down or wrapped around a curved surface, the message will still get through.

Description: The anatomy of a QR Code

(Please Note - Paignton (Palace Avenue) Methodist Church cannot accept responsible for any damage that may occur by visiting third party sites, downloading or using third party software).

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PA QR Code Explained

Why is this symbol used
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