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Decode QRcode images in the article, and display their content for readers. |
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[[File:Wikipedia mobile en.svg|thumb|QR code for the [[URL]] of the English Wikipedia Mobile main page, "''<nowiki>http://en.m.wikipedia.org</nowiki>''"]]
A '''QR code''' (abbreviated from '''Quick Response code''') is a type of [[matrix barcode]] (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside of the industry due to its fast readability and comparatively{{what|reason=compared to what?|date=December 2011}} large storage capacity. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be made up of any kind of data (e.g., binary, alphanumeric, or [[Kanji]] symbols).<ref name=QRCodefeatures>{{cite web |url=http://www.denso-wave.com/qrcode/qrfeature-e.html |title=QR Code features |publisher=Denso-Wave |accessdate=03-10-2011}}</ref>
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<gallery widths=220 heights=220 perrow=3>
File:Qr-1.svg|Version 1, 21×21, 10–25 alphanumeric chars. Content: "''Ver1''"
File:Qr-2.svg|Version 2, 25×25, 20–47 alphanumeric chars. Content: "''Version 2''"
File:Qr-3.svg|Version 3, 29×29, 35–77 alphanumeric chars. Content: "''Version 3 QR Code''"
File:Qr-4.svg|Version 4, 33×33, 50–114 alphanumeric chars. Content: "''Version 4 QR Code, up to 50 char''"
File:Qr-code-ver-10.svg|Version 10, 57x57, 174–395 alphanumeric chars. Content: "''VERSION 10 QR CODE, UP TO 174 CHAR AT H LEVEL, WITH 57X57 MODULES AND PLENTY OF ERROR CORRECTION TO GO AROUND. NOTE THAT THERE ARE ADDITIONAL TRACKING BOXES''"
File:Qr-code-ver-40.svg|Version 40, 177x177, 1,852–4,296 alphanumeric chars. Content (newlines suppressed): "''Version 40 QR Code can contain up to 1852 chars. A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional code) that is designed to be read by smartphones. The code consists of black modules arranged in a square pattern on a white background. The information encoded may be text, a URL, or other data. Created by Toyota subsidiary Denso Wave in 1994, the QR code is one of the most popular types of two-dimensional barcodes. The QR code was designed to allow its contents to be decoded at high speed. The technology has seen frequent use in Japan and South Korea; the United Kingdom is the seventh-largest national consumer of QR codes. Although initially used for tracking parts in vehicle manufacturing, QR codes now are used in a much broader context, including both commercial tracking applications and convenience-oriented applications aimed at mobile phone users (termed mobile tagging). QR codes may be used to display text to the user, to add a vCard contact to the user's device, to open a Uniform Resource Identifier (URI), or to compose an e-mail or text message. Users can generate and print their own QR codes for others to scan and use by visiting one of several paid and free QR code generating sites or apps.''"
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=== Error correction ===
[[File:Extreme QR code to Wikipedia mobile page.png|thumb|141px|Example of a QR code with artistic embellishment that will still scan correctly thanks to error correction. Content: "''M.WIKIPEDIA.ORG''"]]
Codewords are [[Octet (computing)|8 bits]] long and use the [[Reed–Solomon error correction]] algorithm with four error correction levels. The higher the error correction level, the less storage capacity. The following table lists the approximate error correction capability at each of the four levels:
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