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QR code (abbreviated from Quick Response Code) is the trademark for a type of (or two-dimensional ) first designed for the . A barcode is an optically machine-readable label that is attached to an item and that records information related to that item. The information encoded by a QR code may be made up of four standardized types ("modes") of data (numeric, alphanumeric, byte / binary, ) or, through supported extensions, virtually any type of data.

The QR Code system has become popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard . Applications include product tracking, item identification, time tracking, document management, general marketing, and much more.

A QR code consists of black modules (square dots) arranged in a square grid on a white background, which can be read by an imaging device (such as a camera) and processed using error correction until the image can be appropriately interpreted; data is then extracted from patterns present in both horizontal and vertical components of the image.


History
The QR code system was invented in 1994 by 's subsidiary, Wave. Its purpose was to track vehicles during manufacture; it was designed to allow high-speed component scanning. 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. It has since become one of the most-used types of two-dimensional barcode.


Standards
There are several standards that cover the encoding of data as QR codes:

At the application layer, there is some variation between most of the implementations. Japan's has established standards for the encoding of URLs, contact information, and several other data types. The open-source "ZXing" project maintains a list of QR code data types.


Uses
Originally designed for industrial uses, QR codes have become common in consumer advertising. Typically, a is used as a QR-code scanner, displaying the code and converting it to some useful form (such as a standard for a website, thereby obviating the need for a user to type it into a ).

"In the shopping industry, knowing what causes the consumers to be motivated when approaching products by the use of QR codes, advertisers and marketers can use the behavior of scanning to get consumers to buy, causing it to have the best impact on ad and marketing design." As a result, the QR code has become a focus of strategy, since it provides quick and effortless access to the brand's website. Beyond mere convenience to the consumer, the importance of this capability is that it increases the (that is, increases the chance that contact with the advertisement will convert to a sale), by coaxing qualified prospects further down the without any delay or effort, bringing the viewer to the advertiser's site immediately, where a longer and more targeted sales pitch may continue.

Although initially used to track parts in vehicle manufacturing, QR codes are now () used over a much wider range of applications, including commercial tracking, entertainment and transport ticketing, product/loyalty marketing (examples: mobile couponing where a company's discounted and percent discount can be captured using a QR code decoder which is a mobile app, or storing a company's information such as address and related information alongside its alpha-numeric text data as can be seen in Yellow Pages directory), and in-store product labeling. It can also be used in storing personal information for use by organizations. An example of this is Philippines National Bureau of Investigation (NBI) where NBI clearances now come with a QR code. Many of these applications target users (via ). Users may receive text, add a contact to their device, open a (URI), or compose an or text message after scanning QR codes. They can generate and print their own QR codes for others to scan and use by visiting one of several pay or free QR code-generating sites or apps. had a popular to generate QR codes, and apps for scanning QR codes can be found on nearly all smartphone devices.

QR codes storing addresses and (URLs) may appear in magazines, on signs, on buses, on business cards, or on almost any object about which users might want information. Users with a equipped with the correct reader application can scan the image of the QR code to display text, contact information, connect to a , or open a web page in the telephone's browser. This act of linking from physical world objects is termed or . QR codes also may be linked to a location to track where a code has been scanned. Either the application that scans the QR code retrieves the geo information by using GPS and cell tower triangulation (aGPS) or the URL encoded in the QR code itself is associated with a location.

Recruiters have started placing QR codes in job advertisements,http://articles.timesofindia.indiatimes.com/2013-10-19/job-trends/43198946_1_qr-code-website-business-card while applicants have started sporting it in their CVs and visiting cards.

In June 2011, The Royal Dutch Mint (Koninklijke Nederlandse Munt) issued the world's first official coin with a QR code to celebrate the centenary of its current building and premises. The coin can be scanned by a and link to a special website with contents about the historical event and design of the coin. In 2008, a Japanese stonemason announced plans to engrave QR codes on gravestones, allowing visitors to view information about the deceased, and family members to keep track of visits.


Mobile operating systems
QR codes can be used in Google's , OS, Belle and devices (iPhone/iPod/iPad), as well as Microsoft's Windows Phone operating system, , 3rd party barcode scanners, and the . The browser supports , which allows QR codes to send to existing applications on the device. mbarcode is a QR code reader for the operating system. In Apple's iOS, a QR code reader is not natively included, but more than fifty paid and free apps are available with both the ability to scan the codes and hard-link to an external URL. is an example of one of many applications that can scan and hard-link URLs for iOS and Android. devices have a native QR reader as well as several third party readers. is able to scan QR codes through the search app.


URLs
aided even in the pre-smartphone era but during those years faced several limitations: ad viewers usually had to type the URL and often did not have a web browser in front of them at the moment they viewed the ad. The chances were high that they would forget to visit the site later, not bother to type a URL, or forget what URL to type. decreased these risks but did not eliminate them. Some of these disadvantages to URL conversion rates are fading away now that smartphones are putting web access and voice recognition in constant reach. Thus an advert viewer need only reach for his or her phone and speak the URL, at the moment of ad contact, rather than remember to type it into a PC later.


Virtual stores
During the month of June 2011, according to one study, 14 million mobile users scanned a QR code or a barcode. Some 58% of those users scanned a QR or barcode from their homes, while 39% scanned from retail stores; 53% of the 14 million users were men between the ages of 18 and 34. The use of QR codes for "virtual store" formats started in South Korea, and Argentina, but is currently expanding globally. Big companies such as Walmart, Procter & Gamble and Woolworths have already adopted the Virtual Store concept.


Code payments
QR codes can be used to store bank account information or credit card information, or they can be specifically designed to work with particular payment provider applications. There are several trial applications of QR code payments across the world.

In November 2012, QR code payments were deployed on a larger scale in the when an open format for payment information exchange - a - was introduced and endorsed by the Czech Banking Association as the official local solution for QR payments.

Https://blockchain.info/wallet/features< /ref>


Website login
QR codes can be used to log in into websites: a QR Code is shown on the login page on a computer screen, and when a registered user scans it with a verified smartphone, they will automatically be logged in on the computer. Authentication is performed by the smartphone which contacts the server. Google tested such a login method in January 2012.


Design
Unlike the older, one-dimensional barcode that was designed to be mechanically scanned by a narrow beam of light, a QR code is detected by a 2-dimensional digital and then digitally analyzed by a programmed processor. The processor locates the three distinctive squares at the corners of the QR code image, using a smaller square (or multiple squares) near the fourth corner to normalize the image for size, orientation, and angle of viewing. The small dots throughout the QR code are then converted to binary numbers and validated with an error-correcting code.


Storage
The amount of data that can be stored in the QR code symbol depends on the datatype ( mode, or input character set), version (1, …, 40, indicating the overall dimensions of the symbol), and level. The maximum storage capacities occur for 40-L symbols (version 40, error correction level L):
Maximum character storage capacity (40-L)
character refers to individual values of the input mode/datatype
Here are some sample QR code symbols: File:Qr-1.png|Version 1 (21×21). Content: "Ver1" File:Qr-2.png|Version 2 (25×25). Content: "Version 2" File:Qr-3.png|Version 3 (29×29). Content: "Version 3 QR code" File:Qr-4.png|Version 4 (33×33). Content: "Version 4 QR Code, up to 50 char" File:Qr-code-ver-10.png|Version 10 (57×57). 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_Droid_2663.png|Version 25 (117×117 enlarged to 640x640) File:Qr-code-ver-40.png|Version 40 (177×177). Content: 1,264 characters of ordinary/ASCII text: A description of QR codes taken from an early version of this Wikipedia article


Encryption
Encrypted QR codes, which are not very common, have a few implementations. An app, for example, manages encryption and decryption of QR codes using the (56 bits). The Japanese immigration system uses encrypted QR codes when issuing visa in passports as shown in the figure here.


Error correction

Codewords are long and use the 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:

7% of codewords can be restored.
15% of codewords can be restored.
25% of codewords can be restored.
30% of codewords can be restored.

In larger QR symbols, the message is broken up into several Reed–Solomon code blocks. The block size is chosen so that at most 15 errors can be corrected in each block; this limits the complexity of the decoding algorithm. The code blocks are then interleaved together, making it less likely that localized damage to a QR symbol will overwhelm the capacity of any single block.

Thanks to error correction, it is possible to create artistic QR codes that still scan correctly, but contain intentional errors to make them more readable or attractive to the human eye, as well as to incorporate colors, logos, and other features into the QR code block.


Encoding
The format information records two things: the error correction level and the mask pattern used for the symbol. Masking is used to break up patterns in the data area that might confuse a scanner, such as large blank areas or misleading features that look like the locator marks. The mask patterns are defined on a grid that is repeated as necessary to cover the whole symbol. Modules corresponding to the dark areas of the mask are inverted. The format information is protected from errors with a , and two complete copies are included in each QR symbol.

The message data is placed from right to left in a zigzag pattern, as shown below. In larger symbols, this is complicated by the presence of the alignment patterns and the use of multiple interleaved error-correction blocks. File:QR Format Information.svg|Meaning of format information File:QR Character Placement.svg|Message placement within a QR symbol File:QR Ver3 Codeword Ordering.svg|Larger symbol illustrating interleaved blocks

Four-bit indicators are used to select the encoding mode and convey other information. Encoding modes can be mixed as needed within a QR symbol.

Encoding modes ! Indicator !! Meaning
Numeric encoding (10 bits per 3 digits)
Alphanumeric encoding (11 bits per 2 characters)
Byte encoding (8 bits per character)
Kanji encoding (13 bits per character)
Structured append (used to split a message across multiple QR symbols)
(select alternate character set or encoding)
FNC1 in first position (see for more information)
FNC1 in second position
End of message

After every indicator that selects an encoding mode is a length field that tells how many characters are encoded in that mode. The number of bits in the length field depends on the encoding and the symbol version.

Number of bits per length field ! Encoding !! Ver. 1–9 !! 10–26 !! 27–40

Alphanumeric encoding mode stores a message more compactly than the byte mode can, but cannot store lower-case letters and has only a limited selection of punctuation marks, which are sufficient for rudimentary . Two characters are coded in an 11-bit value by this formula:

V = 45 × C1 C2

Alphanumeric character codes ! Code !! Character !! Code !! Character !! Code !! Character !! Code !! Character !! Code !! Character
SP
$
%
*
.
/
:


Decoding example
The following images offer more information about the QR code.

File:QRCode-1-Intro.png|1 — Introduction File:QRCode-2-Structure.png|2 — Structure File:QRCode-3-Layout,Encoding.png|3 — Layout & Encoding File:QRCode-4-Levels,Masks.png|4 — Levels & Masks File:QRCode-5-Protocols.png|5 — Protocols


License
The use of QR codes is free of any license. The QR code is clearly defined and published as an ISO standard.

owns the rights on QR codes, but has chosen not to exercise them. In the USA, the granted QR code patent is , and in Japan . The European Patent Office granted patent to Denso Wave, which was then validated into French, UK, and German patents, all of which are still in force as of November 2011.

The word QR code itself is a of Denso Wave Incorporated. In UK, the trademark is registered as E921775, the word "QR Code", with a filing date of 03/09/1998. The UK version of the trademark is based on the Kabushiki Kaisha Denso (DENSO CORPORATION) trademark, filed as Trademark 000921775, the word "QR Code", on 03/09/1998 and registered on 6/12/1999 with the European Union OHIM (Office for Harmonization in the Internal Market). The U.S. Trademark for the word "QR Code" is Trademark 2435991 and was filed on 29 September 1998 with an amended registration date of 13 March 2001, assigned to Denso Corporation.


Variants
Micro QR code is a smaller version of the QR code standard for applications with less ability to handle large scans. There are different forms of Micro QR codes as well. The highest of these can hold 35 numeric characters.Information technology — Automatic identification and data capture techniques — QR Code 2005 bar code symbology specification, ISO/IEC 18004:2006 cor. 2009, pages 3, 6.

Model 1 QR code is an older version of the specification. It is visually similar to the widely seen model 2 codes, but lacks alignment patterns.

File:Micro QR Example.svg|Micro QR code example File:Micro QR Version 3M Layout.svg|Micro QR code functional regions File:QR Code Model 1 Example.svg|Model 1 QR code example File:Model 1 QR Version 2 Layout.svg|Model 1 QR code functional regions


Risks
The only context in which common QR codes can carry executable data is the data type, which may carry Javascript, but is only supposed to be executed in a regular browsing context, therefore carrying only minimal risk of abuse (no more than opening any web page). However, QR codes may be used to exploit flaws in other applications on the host system, such as the reader, the browser or the image viewer, since a reader will typically send the data to the application associated with the data type used by the QR code.

Malicious QR codes combined with a permissive reader can put a computer's contents and user's privacy at risk. This practice is known as "attagging", a of "attack tagging".. They are easily created and can be affixed over legitimate QR codes. On a , the reader's permissions may allow use of the camera, full Internet access, read/write contact data, , read history, read/write local storage, and global system changes.

Risks include linking to dangerous web sites with browser exploits, enabling the microphone/camera/GPS, and then streaming those feeds to a remote server, analysis of sensitive data (passwords, files, contacts, transactions), and sending email//IM messages or packets as part of a , corrupting privacy settings, stealing identity, and even containing malicious logic themselves such as or a virus.QR Codes hold up to 2.9 KB whereas the smallest known computer virus is about one-tenth that size These actions could occur in the background while the user is only seeing the reader opening a seemingly harmless web page. In Russia, a malicious QR code caused phones that scanned it to send premium texts at a fee of US$6 each.


See also


Bibliography


External links
  • Reed Solomon Codes for Coders – an elaborate tutorial on Wikiversity, covering both QR code structure and the Reed Solomon codes used to encode the data.
  • Information on converting a URL into a QR code


References
    ^ (2017). 9780580673689, . .

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