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{{short description|Optical machine-readable representation of data}}{{for-multi|the taxonomic method|DNA barcoding|a code of conduct for barristers|Legal ethics}}{{Use dmy dates|date=April 2020}}File:UPC-A-036000291452.svg|thumb|A UPC-A barcode]]A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode readers, of which there are several types.Later, two-dimensional (2D) variants were developed, using rectangles, dots, hexagons and other patterns, called 2D barcodes or matrix codes, although they do not use bars as such. Both can be read using purpose-built 2D optical scanners, which exist in a few different forms. Matrix codes can also be read by a digital camera connected to a microcomputer running software that takes a photographic image of the barcode and analyzes the image to deconstruct and decode the code. A mobile device with a built-in camera, such as a smartphone, can function as the latter type of barcode reader using specialized application software and is suitable for both 1D and 2D codes.(File:Barcodes on British Railways rolling stock in 1962 (Modern Railways Dec 1962) 000130.jpg|thumb|Barcoded rolling stock in the UK, 1962)The barcode was invented by Norman Joseph Woodland and Bernard Silver and patented in the US in 1952.PATENT, US, 2612994, patent, The invention was based on Morse codeWEB,www.stuffyoushouldknow.com/podcasts/how-barcodes-work.htm, How Barcodes Work, 4 June 2019, Stuff You Should Know, en, 5 June 2019, 5 June 2019,web.archive.org/web/20190605080136/https://www.stuffyoushouldknow.com/podcasts/how-barcodes-work.htm, dead, that was extended to thin and thick bars. However, it took over twenty years before this invention became commercially successful. UK magazine Modern Railways December 1962 pages 387–389 record how British Railways had already perfected a barcode-reading system capable of correctly reading rolling stock travelling at {{cvt|100|mph|km/h}} with no mistakes. An early use of one type of barcode in an industrial context was sponsored by the Association of American Railroads in the late 1960s. Developed by General Telephone and Electronics (GTE) and called KarTrak ACI (Automatic Car Identification), this scheme involved placing colored stripes in various combinations on steel plates which were affixed to the sides of railroad rolling stock. Two plates were used per car, one on each side, with the arrangement of the colored stripes encoding information such as ownership, type of equipment, and identification number.WEB,www.nakina.net/other/aci/aci.html, A guide to ACI (Automatic Car Identification)/KarTrak, Cranstone, Ian, Canadian Freight Cars A resource page for the Canadian Freight Car Enthusiast, 26 May 2013, 27 August 2011,www.nakina.net/other/aci/aci.html," title="web.archive.org/web/20110827124711www.nakina.net/other/aci/aci.html,">web.archive.org/web/20110827124711www.nakina.net/other/aci/aci.html, live, The plates were read by a trackside scanner located, for instance, at the entrance to a classification yard, while the car was moving past.WEB, Keyes, John, 22 August 2003, KarTrak,johnkeyes.com/2003/08/kartrak, dead,johnkeyes.com/2003/08/kartrak," title="web.archive.org/web/20140310153027johnkeyes.com/2003/08/kartrak,">web.archive.org/web/20140310153027johnkeyes.com/2003/08/kartrak, 10 March 2014, 26 May 2013, John Keyes Boston photoblogger. Images from Boston, New England, and beyond., John Keyes, The project was abandoned after about ten years because the system proved unreliable after long-term use.Barcodes became commercially successful when they were used to automate supermarket checkout systems, a task for which they have become almost universal. The Uniform Grocery Product Code Council had chosen, in 1973, the barcode design developed by George Laurer. Laurer’s barcode, with vertical bars, printed better than the circular barcode developed by Woodland and Silver.NEWS, Roberts, Sam, George Laurer, Who Developed the Bar Code, Is Dead at 94,www.nytimes.com/2019/12/11/technology/george-laurer-dead.html, 13 December 2019, The New York Times, 11 December 2019, 22 June 2020,web.archive.org/web/20200622055851/https://www.nytimes.com/2019/12/11/technology/george-laurer-dead.html?searchResultPosition=1, live, Their use has spread to many other tasks that are generically referred to as automatic identification and data capture (AIDC). The first successful system using barcodes was in the UK supermarket group Sainsbury’s in 1972 using shelf-mounted barcodes which were developed by Plessey.NEWS, Brown, Derrick, 19 January 2023, Birth of the Barcode: a talk given to the Computer Conservation Society, In June 1974, Marsh supermarket in Troy, Ohio used a scanner made by Photographic Sciences Corporation to scan the Universal Product Code (UPC) barcode on a pack of Wrigley’s chewing gum.NEWS, Fox, Margalit,www.nytimes.com/2011/06/16/business/16haberman.html, Alan Haberman, Who Ushered in the Bar Code, Dies at 81, The New York Times, 15 June 2011, 24 February 2017, 24 June 2017,www.nytimes.com/2011/06/16/business/16haberman.html?_r=1&hp&gwh=7657EAA31B3069C9E728CC93FD2695E8," title="web.archive.org/web/20170624163459www.nytimes.com/2011/06/16/business/16haberman.html?_r=1&hp&gwh=7657EAA31B3069C9E728CC93FD2695E8,">web.archive.org/web/20170624163459www.nytimes.com/2011/06/16/business/16haberman.html?_r=1&hp&gwh=7657EAA31B3069C9E728CC93FD2695E8, live, {{R|“RobertsNYT“}} QR codes, a specific type of 2D barcode, have recently{{when|date=September 2023}} become very popular due to the growth in smartphone ownership.NEWS, Why QR codes are on the rise,www.economist.com/blogs/economist-explains/2017/11/economist-explains-0, G. F., The Economist, 5 February 2018, en, 2 November 2017, 5 February 2018,web.archive.org/web/20180205184837/https://www.economist.com/blogs/economist-explains/2017/11/economist-explains-0, live, Other systems have made inroads in the AIDC market, but the simplicity, universality and low cost of barcodes has limited the role of these other systems, particularly before technologies such as radio-frequency identification (RFID) became available after 1995.

History

{{duplication|dupe=Universal Product Code#History|date=December 2013}}In 1948, Bernard Silver, a graduate student at Drexel Institute of Technology in Philadelphia, Pennsylvania, US overheard the president of the local food chain, Food Fair, asking one of the deans to research a system to automatically read product information during checkout.NEWS, 1 August 2001, The Killer App – Bar None,www.americanwaymag.com/so-woodland-bar-code-bernard-silver-drexel-university, Charles, Fishman, American Way, 19 April 2010, dead,www.americanwaymag.com/so-woodland-bar-code-bernard-silver-drexel-university," title="web.archive.org/web/20100112043409www.americanwaymag.com/so-woodland-bar-code-bernard-silver-drexel-university,">web.archive.org/web/20100112043409www.americanwaymag.com/so-woodland-bar-code-bernard-silver-drexel-university, 12 January 2010, Silver told his friend Norman Joseph Woodland about the request, and they started working on a variety of systems. Their first working system used ultraviolet ink, but the ink faded too easily and was expensive.{{Citation |first=Tony |last=Seideman |title=Barcodes Sweep the World |work=Wonders of Modern Technology |url=http://www.bar-code.com/upc/bar_code_history.php |archive-url=https://web.archive.org/web/20161016084435www.bar-code.com/upc/bar_code_history.php|archive-date=16 October 2016|url-status=dead|date=Spring 1993}}Convinced that the system was workable with further development, Woodland left Drexel, moved into his father’s apartment in Florida, and continued working on the system. His next inspiration came from Morse code, and he formed his first barcode from sand on the beach. “I just extended the dots and dashes downwards and made narrow lines and wide lines out of them.” To read them, he adapted technology from optical soundtracks in movies, using a 500-watt incandescent light bulb shining through the paper onto an RCA935 photomultiplier tube (from a movie projector) on the far side. He later decided that the system would work better if it were printed as a circle instead of a line, allowing it to be scanned in any direction.On 20 October 1949, Woodland and Silver filed a patent application for “Classifying Apparatus and Method”, in which they described both the linear and bull’s eye printing patterns, as well as the mechanical and electronic systems needed to read the code. The patent was issued on 7 October 1952 as US Patent 2,612,994. In 1951, Woodland moved to IBM and continually tried to interest IBM in developing the system. The company eventually commissioned a report on the idea, which concluded that it was both feasible and interesting, but that processing the resulting information would require equipment that was some time off in the future.IBM offered to buy the patent, but the offer was not accepted. Philco purchased the patent in 1962 and then sold it to RCA sometime later.

Collins at Sylvania

During his time as an undergraduate, David Jarrett Collins worked at the Pennsylvania Railroad and became aware of the need to automatically identify railroad cars. Immediately after receiving his master’s degree from MIT in 1959, he started work at GTE Sylvania and began addressing the problem. He developed a system called KarTrak using blue, white and red reflective stripes attached to the side of the cars, encoding a four-digit company identifier and a six-digit car number. Light reflected off the colored stripes was read by photomultiplier vacuum tubes.WEB,www.technologyreview.com/s/601032/david-collins-sm-59/, David Collins, SM ‘59: Making his mark on the world with bar codes, Dunn, Peter, 20 October 2015, technologyreview.com, MIT, 2 December 2019, 10 November 2018,web.archive.org/web/20181110013152/https://www.technologyreview.com/s/601032/david-collins-sm-59/, live, The Boston and Maine Railroad tested the KarTrak system on their gravel cars in 1961. The tests continued until 1967, when the Association of American Railroads (AAR) selected it as a standard, Automatic Car Identification, across the entire North American fleet. The installations began on 10 October 1967. However, the economic downturn and rash of bankruptcies in the industry in the early 1970s greatly slowed the rollout, and it was not until 1974 that 95% of the fleet was labeled. To add to its woes, the system was found to be easily fooled by dirt in certain applications, which greatly affected accuracy. The AAR abandoned the system in the late 1970s, and it was not until the mid-1980s that they introduced a similar system, this time based on radio tags.JOURNAL, Graham-White, Sean, August 1999, Do You Know Where Your Boxcar Is?, Trains, 59, 8, 48–53, The railway project had failed, but a toll bridge in New Jersey requested a similar system so that it could quickly scan for cars that had purchased a monthly pass. Then the U.S. Post Office requested a system to track trucks entering and leaving their facilities. These applications required special retroreflector labels. Finally, Kal Kan asked the Sylvania team for a simpler (and cheaper) version which they could put on cases of pet food for inventory control.

Computer Identics Corporation

In 1967, with the railway system maturing, Collins went to management looking for funding for a project to develop a black-and-white version of the code for other industries. They declined, saying that the railway project was large enough, and they saw no need to branch out so quickly.Collins then quit Sylvania and formed the Computer Identics Corporation. As its first innovations, Computer Identics moved from using incandescent light bulbs in its systems, replacing them with helium–neon lasers, and incorporated a mirror as well, making it capable of locating a barcode up to a meter (3 feet) in front of the scanner. This made the entire process much simpler and more reliable, and typically enabled these devices to deal with damaged labels, as well, by recognizing and reading the intact portions.Computer Identics Corporation installed one of its first two scanning systems in the spring of 1969 at a General Motors (Buick) factory in Flint, Michigan. The system was used to identify a dozen types of transmissions moving on an overhead conveyor from production to shipping. The other scanning system was installed at General Trading Company’s distribution center in Carlstadt, New Jersey to direct shipments to the proper loading bay.

Universal Product Code

In 1966, the National Association of Food Chains (NAFC) held a meeting on the idea of automated checkout systems. RCA, who had purchased the rights to the original Woodland patent, attended the meeting and initiated an internal project to develop a system based on the bullseye code. The Kroger grocery chain volunteered to test it.In the mid-1970s, the NAFC established the Ad-Hoc Committee for U.S. Supermarkets on a Uniform Grocery-Product Code to set guidelines for barcode development. In addition, it created a symbol-selection subcommittee to help standardize the approach. In cooperation with consulting firm, McKinsey & Co., they developed a standardized 11-digit code for identifying products. The committee then sent out a contract tender to develop a barcode system to print and read the code. The request went to Singer, National Cash Register (NCR), Litton Industries, RCA, Pitney-Bowes, IBM and many others.WEB, George, Laurer, George Laurer,bellsouthpwp.net/l/a/laurergj/UPC/upc_work.html, Development of the U.P.C. Symbol,bellsouthpwp.net/l/a/laurergj/UPC/upc_work.html," title="web.archive.org/web/20080925105745bellsouthpwp.net/l/a/laurergj/UPC/upc_work.html,">web.archive.org/web/20080925105745bellsouthpwp.net/l/a/laurergj/UPC/upc_work.html, 25 September 2008, A wide variety of barcode approaches was studied, including linear codes, RCA’s bullseye concentric circle code, (wikt:starburst|starburst) patterns and others.In the spring of 1971, RCA demonstrated their bullseye code at another industry meeting. IBM executives at the meeting noticed the crowds at the RCA booth and immediately developed their own system. IBM marketing specialist Alec Jablonover remembered that the company still employed Woodland, and he established a new facility in Raleigh-Durham Research Triangle Park to lead development.In July 1972, RCA began an 18-month test in a Kroger store in Cincinnati. Barcodes were printed on small pieces of adhesive paper, and attached by hand by store employees when they were adding price tags. The code proved to have a serious problem; the printers would sometimes smear ink, rendering the code unreadable in most orientations. However, a linear code, like the one being developed by Woodland at IBM, was printed in the direction of the stripes, so extra ink would simply make the code “taller” while remaining readable. So on 3 April 1973, the IBM UPC was selected as the NAFC standard. IBM had designed five versions of UPC symbology for future industry requirements: UPC A, B, C, D, and E.BOOK, Nelson, Benjamin, 1997, Punched Cards To Bar Codes: A 200-year journey, Helmers, Peterborough, N.H., 9780911261127, NCR installed a testbed system at Marsh’s Supermarket in Troy, Ohio, near the factory that was producing the equipment. On 26 June 1974, Clyde Dawson pulled a 10-pack of Wrigley’s Juicy Fruit gum out of his basket and it was scanned by Sharon Buchanan at 8:01 am. The pack of gum and the receipt are now on display in the Smithsonian Institution. It was the first commercial appearance of the UPC.JOURNAL, Varchaver, Nicholas, 31 May 2004, Scanning the Globe, Fortune (magazine), Fortune,money.cnn.com/magazines/fortune/fortune_archive/2004/05/31/370719/index.htm, 27 November 2006,web.archive.org/web/20061114065720/https://money.cnn.com/magazines/fortune/fortune_archive/2004/05/31/370719/index.htm, 14 November 2006, live, In 1971, an IBM team was assembled for an intensive planning session, threshing out, 12 to 18 hours a day, how the technology would be deployed and operate cohesively across the system, and scheduling a roll-out plan. By 1973, the team were meeting with grocery manufacturers to introduce the symbol that would need to be printed on the packaging or labels of all of their products. There were no cost savings for a grocery to use it, unless at least 70% of the grocery’s products had the barcode printed on the product by the manufacturer. IBM projected that 75% would be needed in 1975. Yet, although this was achieved, there were still scanning machines in fewer than 200 grocery stores by 1977.BOOK, Spreading the Barcode, Selmeier, Bill, 2009, Lulu, 26, 214, 236, 238, 244, 245, 236, 238, 244, 245, 978-0-578-02417-2, Economic studies conducted for the grocery industry committee projected over $40 million in savings to the industry from scanning by the mid-1970s. Those numbers were not achieved in that time-frame and some predicted the demise of barcode scanning. The usefulness of the barcode required the adoption of expensive scanners by a critical mass of retailers while manufacturers simultaneously adopted barcode labels. Neither wanted to move first and results were not promising for the first couple of years, with Business Week proclaiming “The Supermarket Scanner That Failed” in a 1976 article.NEWS,www.nytimes.com/2010/02/28/t-magazine/womens-fashion/28talk-rawsthorn.html, Scan Artists, New York Times, Rawsthorn, Alice, 23 February 2010, 31 July 2015, 18 November 2016,www.nytimes.com/2010/02/28/t-magazine/womens-fashion/28talk-rawsthorn.html?_r=0," title="web.archive.org/web/20161118202704www.nytimes.com/2010/02/28/t-magazine/womens-fashion/28talk-rawsthorn.html?_r=0,">web.archive.org/web/20161118202704www.nytimes.com/2010/02/28/t-magazine/womens-fashion/28talk-rawsthorn.html?_r=0, live, On the other hand, experience with barcode scanning in those stores revealed additional benefits. The detailed sales information acquired by the new systems allowed greater responsiveness to customer habits, needs and preferences. This was reflected in the fact that about 5 weeks after installing barcode scanners, sales in grocery stores typically started climbing and eventually leveled off at a 10–12% increase in sales that never dropped off. There was also a 1–2% decrease in operating cost for those stores, and this enabled them to lower prices and thereby to increase market share. It was shown in the field that the return on investment for a barcode scanner was 41.5%. By 1980, 8,000 stores per year were converting.Sims Supermarkets were the first location in Australia to use barcodes, starting in 1979.WEB, World hails barcode on important birthday,www.fullyloaded.com.au/news/logistics/1407/world-hails-barcode-on-important-birthday/, ATN, 1 July 2014, 15 February 2017, 23 July 2014,www.fullyloaded.com.au/news/logistics/1407/world-hails-barcode-on-important-birthday/," title="web.archive.org/web/20140723051540www.fullyloaded.com.au/news/logistics/1407/world-hails-barcode-on-important-birthday/,">web.archive.org/web/20140723051540www.fullyloaded.com.au/news/logistics/1407/world-hails-barcode-on-important-birthday/, live,

Barcode system

A barcode system is a network of hardware and software, consisting primarily of mobile computers, printers, handheld scanners, infrastructure, and supporting software. Barcode systems are used to automate data collection where hand recording is neither timely nor cost effective. Despite often being provided by the same company, Barcoding systems are not radio-frequency identification (RFID) systems. Many companies use both technologies as part of larger resource management systems.A typical barcode system consist of some infrastructure, either wired or wireless that connects some number of mobile computers, handheld scanners, and printers to one or many databases that store and analyze the data collected by the system. At some level there must be some software to manage the system. The software may be as simple as code that manages the connection between the hardware and the database or as complex as an ERP, MRP, or some other inventory management software.

Hardware

There is a wide range of hardware that is manufactured today for use in Barcode Systems. The best known brand of handheld scanners and mobile computers is Symbol, which is now a division of Motorola. Other manufacturers include Datalogic, Intermec, HHP (Hand Held Products), Microscan Systems, Unitech, Metrologic, PSC and PANMOBIL.

Software

While there is a range of hardware on the market, software is more difficult to find from the hardware manufacturers. Some ERP, MRP, and other inventory management software have built in support for barcode reading and some even allow the software to run directly on a mobile computer. Besides full management software, there are more than a few software development kits on the market that allow the developer to easily produce custom mobile interfaces and that handle the connect to the database. One such software is RFgen another is PeopleVox. Then there is always the option of developing a custom software solution, using a language such as C++, C#, Java, Visual Basic.NET, and many others. Often developing a custom interface using software such as RFgen or developing new, personalized software is the most effective method since it allows the individual to have a solution that is fitted to their exact needs.

Industrial adoption

In 1981, the United States Department of Defense adopted the use of Code 39 for marking all products sold to the United States military. This system, Logistics Applications of Automated Marking and Reading Symbols (LOGMARS), is still used by DoD and is widely viewed as the catalyst for widespread adoption of barcoding in industrial uses.WEB,www.adams1.com/history.html, A Short History of Bar Code, BarCode 1, Adams Communications, 28 November 2011, 2 May 2010,www.adams1.com/history.html," title="web.archive.org/web/20100502072956www.adams1.com/history.html,">web.archive.org/web/20100502072956www.adams1.com/history.html, live,

Use

File:Snack vendor on the Shinkansen. 2005 (26321781190).jpg|thumb|right|Snack vendor on the ShinkansenShinkansenFile:EAN-13-ISBN-13.svg|thumb|right|EAN-13 ISBN barcode ]](File:LB2-ADULT-L3 Assembled.jpg|thumb|right|Barcode on a patient identification wristband)(File:Barcodedmail.JPG|thumb|right|Barcoded parcel)Barcodes are widely used around the world in many contexts. In stores, UPC barcodes are pre-printed on most items other than fresh produce from a grocery store. This speeds up processing at check-outs and helps track items and also reduces instances of shoplifting involving price tag swapping, although shoplifters can now print their own barcodes.WEB,iwatchsystems.com/technical/2011/05/02/barcode/, Barcode, iWatch Systems, 2 May 2011, 28 November 2011, 9 January 2012,iwatchsystems.com/technical/2011/05/02/barcode/," title="web.archive.org/web/20120109011439iwatchsystems.com/technical/2011/05/02/barcode/,">web.archive.org/web/20120109011439iwatchsystems.com/technical/2011/05/02/barcode/, live, Barcodes that encode a book’s ISBN are also widely pre-printed on books, journals and other printed materials. In addition, retail chain membership cards use barcodes to identify customers, allowing for customized marketing and greater understanding of individual consumer shopping patterns. At the point of sale, shoppers can get product discounts or special marketing offers through the address or e-mail address provided at registration.Barcodes are widely used in the healthcare and hospital settings, ranging from patient identification (to access patient data, including medical history, drug allergies, etc.) to creating SOAP NotesWEB, Oberfield, Craig, QNotes Barcode System,www.qnotes.com/quix/, US Patented #5296688, Quick Notes Inc., 15 December 2012, 31 December 2012,qnotes.com/quix/," title="web.archive.org/web/20121231170857qnotes.com/quix/,">web.archive.org/web/20121231170857qnotes.com/quix/, live, with barcodes to medication management. They are also used to facilitate the separation and indexing of documents that have been imaged in batch scanning applications, track the organization of species in biology,National Geographic, May 2010, page 30 and integrate with in-motion checkweighers to identify the item being weighed in a conveyor line for data collection.They can also be used to keep track of objects and people; they are used to keep track of rental cars, airline luggage, nuclear waste, registered mail, express mail and parcels. Barcoded tickets (which may be printed by the customer on their home printer, or stored on their mobile device) allow the holder to enter sports arenas, cinemas, theatres, fairgrounds, and transportation, and are used to record the arrival and departure of vehicles from rental facilities etc. This can allow proprietors to identify duplicate or fraudulent tickets more easily. Barcodes are widely used in shop floor control applications software where employees can scan work orders and track the time spent on a job.Barcodes are also used in some kinds of non-contact 1D and 2D position sensors. A series of barcodes are used in some kinds of absolute 1D linear encoder. The barcodes are packed close enough together that the reader always has one or two barcodes in its field of view. As a kind of fiducial marker, the relative position of the barcode in the field of view of the reader gives incremental precise positioning, in some cases with sub-pixel resolution. The data decoded from the barcode gives the absolute coarse position. An “address carpet”, used in digital paper, such as Howell’s binary pattern and the Anoto dot pattern, is a 2D barcode designed so that a reader, even though only a tiny portion of the complete carpet is in the field of view of the reader, can find its absolute X, Y position and rotation in the carpet.JOURNAL, David L., Hecht,jupiter.plymouth.edu/~wjt/HCI/ui2.pdf, Printed Embedded Data Graphical User Interfaces,turing.plymouth.edu/~wjt/HCI/ui2.pdf," title="web.archive.org/web/20130603223227turing.plymouth.edu/~wjt/HCI/ui2.pdf,">web.archive.org/web/20130603223227turing.plymouth.edu/~wjt/HCI/ui2.pdf, 3 June 2013, Xerox Palo Alto Research Center, IEEE Computer, March 2001, 34, 3, 47–55, 10.1109/2.910893, WEB, Jon, Howell, Keith, Kotay,www.cs.dartmouth.edu/reports/abstracts/TR2000-364/, Landmarks for absolute localization, Dartmouth Computer Science Technical Report TR2000-364, March 2000,www.cs.dartmouth.edu/reports/TR2000-364.pdf," title="web.archive.org/web/20201001131924www.cs.dartmouth.edu/reports/TR2000-364.pdf,">web.archive.org/web/20201001131924www.cs.dartmouth.edu/reports/TR2000-364.pdf, 2020-10-01, Matrix codes can embed a hyperlink to a web page. A mobile device with a built-in camera might be used to read the pattern and browse the linked website, which can help a shopper find the best price for an item in the vicinity. Since 2005, airlines use an IATA-standard 2D barcode on boarding passes (Bar Coded Boarding Pass (BCBP)), and since 2008 2D barcodes sent to mobile phones enable electronic boarding passes.WEB,www.iata.org/, IATA.org, IATA.org, 21 November 2011, 28 November 2011, 4 January 2012,www1.iata.org/," title="web.archive.org/web/20120104081606www1.iata.org/,">web.archive.org/web/20120104081606www1.iata.org/, live, Some applications for barcodes have fallen out of use. In the 1970s and 1980s, software source code was occasionally encoded in a barcode and printed on paper (Cauzin Softstrip and PaperbyteNEWS,primepuzzle.com/waduzitdo/waduzitdo.html, Paperbyte Bar Codes for Waduzitdo, Byte (magazine), Byte magazine, September 1978, 172, 6 February 2009, 4 July 2017,primepuzzle.com/waduzitdo/waduzitdo.html," title="web.archive.org/web/20170704113826primepuzzle.com/waduzitdo/waduzitdo.html,">web.archive.org/web/20170704113826primepuzzle.com/waduzitdo/waduzitdo.html, live, are barcode symbologies specifically designed for this application), and the 1991 Barcode Battler computer game system used any standard barcode to generate combat statistics.Artists have used barcodes in art, such as Scott Blake’s Barcode Jesus, as part of the post-modernism movement.

Symbologies

The mapping between messages and barcodes is called a symbology. The specification of a symbology includes the encoding of the message into bars and spaces, any required start and stop markers, the size of the quiet zone required to be before and after the barcode, and the computation of a checksum.Linear symbologies can be classified mainly by two properties:

Continuous vs. discrete

• Characters in discrete symbologies are composed of n bars and n âˆ’ 1 spaces. There is an additional space between characters, but it does not convey information, and may have any width as long as it is not confused with the end of the code.
• Characters in continuous symbologies are composed of n bars and n spaces, and usually abut, with one character ending with a space and the next beginning with a bar, or vice versa. A special end pattern that has bars on both ends is required to end the code.

Two-width vs. many-width

• A two-width, also called a binary bar code, contains bars and spaces of two widths, “wide” and “narrow”. The precise width of the wide bars and spaces is not critical; typically, it is permitted to be anywhere between 2 and 3 times the width of the narrow equivalents.
• Some other symbologies use bars of two different heights (POSTNET), or the presence or absence of bars (CPC Binary Barcode). These are normally also considered binary bar codes.
• Bars and spaces in many-width symbologies are all multiples of a basic width called the module; most such codes use four widths of 1, 2, 3 and 4 modules.

Some symbologies use interleaving. The first character is encoded using black bars of varying width. The second character is then encoded by varying the width of the white spaces between these bars. Thus, characters are encoded in pairs over the same section of the barcode. Interleaved 2 of 5 is an example of this.Stacked symbologies repeat a given linear symbology vertically.The most common among the many 2D symbologies are matrix codes, which feature square or dot-shaped modules arranged on a grid pattern. 2D symbologies also come in circular and other patterns and may employ steganography, hiding modules within an image (for example, DataGlyphs).Linear symbologies are optimized for laser scanners, which sweep a light beam across the barcode in a straight line, reading a slice of the barcode light-dark patterns. Scanning at an angle makes the modules appear wider, but does not change the width ratios. Stacked symbologies are also optimized for laser scanning, with the laser making multiple passes across the barcode.In the 1990s development of charge-coupled device (CCD) imagers to read barcodes was pioneered by Welch Allyn. Imaging does not require moving parts, as a laser scanner does. In 2007, linear imaging had begun to supplant laser scanning as the preferred scan engine for its performance and durability.2D symbologies cannot be read by a laser, as there is typically no sweep pattern that can encompass the entire symbol. They must be scanned by an image-based scanner employing a CCD or other digital camera sensor technology.

Barcode readers

File:GTIN Barcodes of coke bottles - what you see and what the barcode scanner see 2 IMG 2908 2913 2919.JPG|thumb|GTIN barcodes on Coca-Cola bottles. The images at right show how the laserlaserThe earliest, and still{{when|date=September 2022}} the cheapest, barcode scanners are built from a fixed light and a single photosensor that is manually moved across the barcode. Barcode scanners can be classified into three categories based on their connection to the computer. The older type is the RS-232 barcode scanner. This type requires special programming for transferring the input data to the application program. Keyboard interface scanners connect to a computer using a PS/2 or AT keyboard–compatible adaptor cable (a “keyboard wedge“). The barcode’s data is sent to the computer as if it had been typed on the keyboard.Like the keyboard interface scanner, USB scanners do not need custom code for transferring input data to the application program. On PCs running Windows the human interface device emulates the data merging action of a hardware “keyboard wedge”, and the scanner automatically behaves like an additional keyboard.Most modern smartphones are able to decode barcode using their built-in camera. Google’s mobile Android operating system can use their own Google Lens application to scan QR codes, or third-party apps like Barcode Scanner to read both one-dimensional barcodes and QR codes. Google’s Pixel devices can natively read QR codes inside the default Pixel Camera app. Nokia’s Symbian operating system featured a barcode scanner,WEB,europe.nokia.com/support/product-support/nokia-n80/phone-software/smartphone, Nokia Europe, Nokia N80 Support,europe.nokia.com/support/product-support/nokia-n80/phone-software/smartphone," title="web.archive.org/web/20110714030851europe.nokia.com/support/product-support/nokia-n80/phone-software/smartphone,">web.archive.org/web/20110714030851europe.nokia.com/support/product-support/nokia-n80/phone-software/smartphone, 14 July 2011, dead, while mbarcodeWEB,maemo.org/packages/view/mbarcode/, package overview for mbarcode, Maemo.org, 28 July 2010, 7 April 2019,maemo.org/packages/view/mbarcode/," title="web.archive.org/web/20190407120644maemo.org/packages/view/mbarcode/,">web.archive.org/web/20190407120644maemo.org/packages/view/mbarcode/, live, is a QR code reader for the Maemo operating system. In Apple iOS 11, the native camera app can decode QR codes and can link to URLs, join wireless networks, or perform other operations depending on the QR Code contents.WEB,www.imore.com/how-use-qr-codes-ios-11, 1 October 2017, How to use QR codes in iOS 11, iMore, Mikah, Sargent, 24 September 2017, 2 October 2017,web.archive.org/web/20171002120404/https://www.imore.com/how-use-qr-codes-ios-11, live, Other paid and free apps are available with scanning capabilities for other symbologies or for earlier iOS versions.WEB,www.iphoneness.com/iphone-apps/5-best-barcode-iphone-applications/, 1 October 2017, 15+ Best Barcode Scanner iPhone Applications, iPhoneness, 3 March 2017, 2 October 2017,web.archive.org/web/20171002120130/https://www.iphoneness.com/iphone-apps/5-best-barcode-iphone-applications/, live, With BlackBerry devices, the App World application can natively scan barcodes and load any recognized Web URLs on the device’s Web browser. Windows Phone 7.5 is able to scan barcodes through the Bing search app. However, these devices are not designed specifically for the capturing of barcodes. As a result, they do not decode nearly as quickly or accurately as a dedicated barcode scanner or portable data terminal.{{citation needed|date=February 2020}}

Quality control and verification

It is common for producers and users of bar codes to have a quality management system which includes verification and validation of bar codes.{{citation A barcode verifier works the way a reader does, but instead of simply decoding a barcode, a verifier performs a series of tests. For linear barcodes these tests are:

• Edge contrast (EC)
  • The difference between the space reflectance (Rs) and adjoining bar reflectance (Rb). EC=Rs-Rb
• Minimum bar reflectance (Rb)
  • The smallest reflectance value in a bar.
• Minimum space reflectance (Rs)
  • The smallest reflectance value in a space.
• Symbol contrast (SC)WEB,www.expresscorp.com/Barcode-Glossary, Barcode Glossary {{!, Express|last=Corp|first=Express|website=Express Corp|language=en|access-date=11 December 2019|archive-date=11 December 2019|archive-url=https://web.archive.org/web/20191211231342www.expresscorp.com/Barcode-Glossary|url-status=live}}
  • Symbol contrast is the difference in reflectance values of the lightest space (including the quiet zone) and the darkest bar of the symbol. The greater the difference, the higher the grade. The parameter is graded as either A, B, C, D, or F. SC=Rmax-Rmin
• Minimum edge contrast (ECmin)
  • The difference between the space reflectance (Rs) and adjoining bar reflectance (Rb). EC=Rs-Rb
• Modulation (MOD)
  • The parameter is graded either A, B, C, D, or F. This grade is based on the relationship between minimum edge contrast (ECmin) and symbol contrast (SC). MOD=ECmin/SC The greater the difference between minimum edge contrast and symbol contrast, the lower the grade. Scanners and verifiers perceive the narrower bars and spaces to have less intensity than wider bars and spaces; the comparison of the lesser intensity of narrow elements to the wide elements is called modulation. This condition is affected by aperture size.
• Inter-character gap
  • In discrete barcodes, the space that disconnects the two contiguous characters. When present, inter-character gaps are considered spaces (elements) for purposes of edge determination and reflectance parameter grades.
• Defects
• Decode
  • Extracting the information which has been encoded in a bar code symbol.
• Decodability
  • Can be graded as A, B, C, D, or F. The Decodability grade indicates the amount of error in the width of the most deviant element in the symbol. The less deviation in the symbology, the higher the grade. Decodability is a measure of print accuracy using the symbology reference decode algorithm.

2D matrix symbols look at the parameters:

• Symbol contrast
• Modulation
• Decode
• Unused error correction
• Fixed (finder) pattern damage
• Grid non-uniformity
• Axial non-uniformityJOURNAL, Bar Code Verification Best Practice work team, GS1 DataMatrix: An introduction and technical overview of the most advanced GS1 Application Identifiers compliant symbology, Global Standards 1, May 2010, 1, 17, 34–36,www.gs1.org/docs/barcodes/GS1_DataMatrix_Introduction_and_technical_overview.pdf, 2 August 2011,www.gs1.org/docs/barcodes/GS1_DataMatrix_Introduction_and_technical_overview.pdf," title="web.archive.org/web/20110720135555www.gs1.org/docs/barcodes/GS1_DataMatrix_Introduction_and_technical_overview.pdf,">web.archive.org/web/20110720135555www.gs1.org/docs/barcodes/GS1_DataMatrix_Introduction_and_technical_overview.pdf, 20 July 2011, live,

Depending on the parameter, each ANSI test is graded from 0.0 to 4.0 (F to A), or given a pass or fail mark. Each grade is determined by analyzing the scan reflectance profile (SRP), an analog graph of a single scan line across the entire symbol. The lowest of the 8 grades is the scan grade, and the overall ISO symbol grade is the average of the individual scan grades. For most applications a 2.5 (C) is the minimal acceptable symbol grade.JOURNAL, GS1 Bar Code Verification Best Practice work team, GS1 Bar Code Verification for Linear Symbols, Global Standards 1, 4, May 2009, 3, 23–32,www.gs1.org/docs/barcodes/GS1_Bar_Code_Verification.pdf, 2 August 2011, 27 September 2011,www.gs1.org/docs/barcodes/GS1_Bar_Code_Verification.pdf," title="web.archive.org/web/20110927053101www.gs1.org/docs/barcodes/GS1_Bar_Code_Verification.pdf,">web.archive.org/web/20110927053101www.gs1.org/docs/barcodes/GS1_Bar_Code_Verification.pdf, live, Compared with a reader, a verifier measures a barcode’s optical characteristics to international and industry standards. The measurement must be repeatable and consistent. Doing so requires constant conditions such as distance, illumination angle, sensor angle and verifier aperture. Based on the verification results, the production process can be adjusted to print higher quality barcodes that will scan down the supply chain.Bar code validation may include evaluations after use (and abuse) testing such as sunlight, abrasion, impact, moisture, etc.{{citation| last =Garner| first =J }}

Barcode verifier standards

Barcode verifier standards are defined by the International Organization for Standardization (ISO), in ISO/IEC 15426-1 (linear) or ISO/IEC 15426-2 (2D).{{citation needed|date=February 2020}} The current international barcode quality specification is ISO/IEC 15416 (linear) and ISO/IEC 15415 (2D).{{citation needed|date=February 2020}} The European Standard EN 1635 has been withdrawn and replaced by ISO/IEC 15416. The original U.S. barcode quality specification was ANSI X3.182. (UPCs used in the US – ANSI/UCC5).{{citation needed|date=February 2020}} As of 2011 the ISO workgroup JTC1 SC31 was developing a Direct Part Marking (DPM) quality standard: ISO/IEC TR 29158.WEB,www.iso.org/iso/iso_technical_committee.html?commid=45332, Technical committees – JTC 1/SC 31 – Automatic identification and data capture techniques, 4 December 2008, ISO, 28 November 2011, 18 October 2011,www.iso.org/iso/iso_technical_committee.html?commid=45332," title="web.archive.org/web/20111018171042www.iso.org/iso/iso_technical_committee.html?commid=45332,">web.archive.org/web/20111018171042www.iso.org/iso/iso_technical_committee.html?commid=45332, live,

Benefits

In point-of-sale management, barcode systems can provide detailed up-to-date information on the business, accelerating decisions and with more confidence. For example:

• Fast-selling items can be identified quickly and automatically reordered.
• Slow-selling items can be identified, preventing inventory build-up.
• The effects of merchandising changes can be monitored, allowing fast-moving, more profitable items to occupy the best space.
• Historical data can be used to predict seasonal fluctuations very accurately.
• Items may be repriced on the shelf to reflect both sale prices and price increases.
• This technology also enables the profiling of individual consumers, typically through a voluntary registration of discount cards. While pitched as a benefit to the consumer, this practice is considered to be potentially dangerous by privacy advocates.{{which|date=March 2019}}

Besides sales and inventory tracking, barcodes are very useful in logistics and supply chain management.

• When a manufacturer packs a box for shipment, a unique identifying number (UID) can be assigned to the box.
• A database can link the UID to relevant information about the box; such as order number, items packed, quantity packed, destination, etc.
• The information can be transmitted through a communication system such as electronic data interchange (EDI) so the retailer has the information about a shipment before it arrives.
• Shipments that are sent to a distribution center (DC) are tracked before forwarding. When the shipment reaches its final destination, the UID gets scanned, so the store knows the shipment’s source, contents, and cost.

Barcode scanners are relatively low cost and extremely accurate compared to key-entry, with only about 1 substitution error in 15,000 to 36 trillion characters entered.BOOK, Craig K., Harmon, Russ, Adams, 1989, Reading Between The Lines:An Introduction to Bar Code Technology, 13, Helmers, Peterborough, NH, 0-911261-00-1, {{Unreliable source?|date=July 2010}} The exact error rate depends on the type of barcode.

Types of barcodes

Linear barcodes

A first generation, “one dimensional” barcode that is made up of lines and spaces of various widths or sizes that create specific patterns.{| class=“wikitable”!Example!!Symbology!!Continuous or discrete!!Bar type!!Uses

128px)	Codabar	Discrete	Two	Old format used in libraries and blood banks and on airbills (out of date, but still widely used in libraries)

	Two-out-of-five code>Code 25 – Non-interleaved 2 of 5	Continuous	Two	Industrial

128px)	Interleaved 2 of 5	>		| Wholesale, libraries International standard ISO/IEC 16390

128px)	Code 11	Discrete	Two	Telephones (out of date)

128px)	Farmacode or Code 32	Discrete	Two	Italian pharmacode – use Code 39 (no international standard available)

128px)	Code 39	Discrete	Two	Various – international standard ISO/IEC 16388

128px)	Code 93	Continuous	Many	Various

128px)	Code 128	Continuous	Many	Various – International Standard ISO/IEC 15417

	CPC Binary Barcode>CPC Binary	Discrete	Two

128px)	Matrix_2_of_5#Datalogic_2_of_5	>		|Datalogic 2 of 5 can encode digits 0-9 and was used mostly in Chinese Postal Services.

128px)	EAN 2	Continuous	Many	Addon code (magazines), GS1-approved – not an own symbology – to be used only with an EAN/UPC according to ISO/IEC 15420

128px)	EAN 5	Continuous	Many	Addon code (books), GS1-approved – not an own symbology – to be used only with an EAN/UPC according to ISO/IEC 15420

128px)	EAN-8, EAN-13	Continuous	Many	Worldwide retail, GS1-approved – International Standard ISO/IEC 15420

	Facing Identification Mark>		|USPS business reply mail

128px)	GS1-128 (formerly named UCC/EAN-128), incorrectly referenced as EAN 128 and UCC 128	Continuous	Many	Various, GS1-approved – just an application of the Code 128 (ISO/IEC 15417) using the ANS MH10.8.2 AI Datastructures. It is not a separate symbology.

128px)	GS1 DataBar, formerly Reduced Space Symbology (RSS)	Continuous	Many	Various, GS1-approved

128px)	Industrial_2_of_5#IATA_2_of_5	>		|IATA 2 of 5 version of Industrial 2 of 5 is used by International Air Transport Association had fixed 17 digits length with 16 valuable package identification digit and 17-th check digit.

128px)	Industrial 2 of 5	Discrete	Two	Industrial 2 of 5 can encode only digits 0-9 and at this time has only historical value.

128px)	ITF-14	Continuous	Two	Non-retail packaging levels, GS1-approved – is just an Interleaved 2/5 Code (ISO/IEC 16390) with a few additional specifications, according to the GS1 General Specifications

128px)	ITF-6	Continuous	Two	Interleaved 2 of 5 barcode to encode an addon to ITF-14 and ITF-16 barcodes. The code is used to encode additional data such as items quantity or container weight

128px)	Japan Article Number	>		|Used in Japan, similar to and compatible with EAN-13 (ISO/IEC 15420)

128px)	Japan Post barcode	Discrete	4 bar heights	Japan Post

128px)	Matrix 2 of 5	Discrete	Two	Matrix 2 of 5 can encode digits 0-9 and was uses for warehouse sorting, photo finishing, and airline ticket marking.

128px)	MSI Barcode	>		|Used for warehouse shelves and inventory

128px)	Pharmacode	Discrete	Two	Pharmaceutical packaging (no international standard available)

	Postal Alpha Numeric Encoding Technique>PLANET	Continuous	Tall/short	United States Postal Service (no international standard available)

128px)	Plessey Code	>		|Catalogs, store shelves, inventory (no international standard available)

128px)	Telepen	Continuous	Two	Libraries (UK)

128px)	Universal Product Code (UPC-A and UPC-E)	Continuous	Many	Worldwide retail, GS1-approved – International Standard ISO/IEC 15420

{{anchor|2D barcodes}} 2D barcodes

2D barcodes consist of bars, but use both dimensions for encoding.{| class=“wikitable”!Example!!Symbology!!Continuous or discrete!!Bar type!!Uses

128px)|Australia Post barcode|Discrete|4 bar heights	Post: Barcoding fact sheet, Oct. 2014

128px)	Codablock	Continuous	Many	Codablock is a family of stacked 1D barcodes (in some cases counted as stacked 2D barcodes) which are used in health care industry (HIBC).

128px)	Code 49	Continuous	Many	Various

128px)|Code 16K||		WEBSITE=WWW.ADAMS1.COM	ARCHIVE-DATE=7 JULY 2011	URL-STATUS=LIVE, HTTP://WWW.GOMARO.CH/FTPROOT/CODE%2016K.PDF>TITLE=CODE 16K SPECS	ACCESS-DATE=12 JANUARY 2019	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20180713121653/HTTP://WWW.GOMARO.CH/FTPROOT/CODE%2016K.PDF, live,

128px)	DX encoding#DX film edge barcode	>		|Color print film

128px)	Intelligent Mail barcode	Discrete	4 bar heights	United States Postal Service, replaces both POSTNET and PLANET symbols (formerly named OneCode)

128px)	KarTrak ACI	Discrete	Coloured bars	Used in North America on railroad rolling equipment

128px)	PostBar	Discrete	4 bar heights	Canadian Post office

Image:POSTNET BAR.svg Image:POSTNET 1.svg Image:POSTNET 2.svg Image:POSTNET 3.svg missing image! - POSTNET BAR.png - >	POSTNET >		| United States Postal Service (no international standard available)

128px)	RM4SCC / KIX	Discrete	4 bar heights	Royal Mail / PostNL

128px)	RM Mailmark C	Discrete	4 bar heights	Royal Mail

128px)	RM Mailmark L	Discrete	4 bar heights	Royal Mail

128px)	Spotify codes	Discrete	23 bar heights	Spotify codes point to artists, songs, podcasts, playlists, and albums. The information is encoded in the height of the bars,BOONE >FIRST=PETER	TITLE=HOW DO SPOTIFY CODES WORK?	ACCESS-DATE=2023-05-03	LANGUAGE=EN	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20230503163202/HTTPS://BOONEPETER.GITHUB.IO/POSTS/2020-11-10-SPOTIFY-CODES/		ACCESS-DATE=2022-08-21	DATE=5 MAY 2017, en-US, Patented under EP3444755.

{{anchor|2D Codes}} Matrix (2D) codes

A matrix code or simply a 2D code, is a two-dimensional way to represent information. It can represent more data per unit area. Apart from dots various other patterns can be used.{| class=“wikitable”!Example!!Name!!Notes

128px)	App Clip Code	Apple-proprietary code for launching “App Clips”, a type of applet. 5 concentric rings of three colors (light, dark, middle).CREATING APP CLIP CODES >URL=HTTPS://DEVELOPER.APPLE.COM/DOCUMENTATION/APP_CLIPS/CREATING_APP_CLIP_CODES?LANGUAGE=OBJC, Apple Developer Documentation,

128px)	ARToolKit	>	augmented reality applications. Some AR Codes can contain QR codes inside, so that AR content can be linked to.HTTPS://JEROMEETIENNE.GITHUB.IO/AR.JS/THREE.JS/EXAMPLES/ARCODE.HTML#%7B%22URLQRCODE%22%3A%22HTTPS%3A%2F%2FEN.PSEUDOPEDIA.ORG%2FWIKI%2FBARCODE%22%2C%22HIDEUIENABLED%22%3AFALSE%7D	ACCESS-DATE=29 APRIL 2017	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20180610214142/HTTPS://JEROMEETIENNE.GITHUB.IO/AR.JS/THREE.JS/EXAMPLES/ARCODE.HTML#%7B%22URLQRCODE%22%3A%22HTTPS%3A%2F%2FEN.PSEUDOPEDIA.ORG%2FWIKI%2FBARCODE%22%2C%22HIDEUIENABLED%22%3AFALSE%7D, live, See also ARTag.

128px)	Aztec Code	Designed by Andrew Longacre at Welch Allyn (now Honeywell Scanning and Mobility). Public domain. – International Standard: ISO/IEC 24778

alt=A bCode matrix code encoding the identifier 1683)|bCode

LAST2=RAO

LAST3=MIDDENDORF

LAST4=DANKOWICZ

LAST5=GOLDENFELD

LAST6=ROBINSON

DATE=2018-02-13

JOURNAL=PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES

VOLUME=115

PAGES=1433–1438

ISSN=0027-8424

PMID=29378954

DOI-ACCESS=FREE, Encodes an 11 bit identifier and 16 bits of read error detection and error correction information. Predominantly used for marking honey bees, but can also be applied to other animals.

alt=BEEtag Matrix Code Image|frameless)|BEEtag		LAST2=MOUNTCASTLE	LAST3=GRAVISH	LAST4=CRALL	DATE=2 SEPTEMBER 2015	JOURNAL=PLOS ONE	VOLUME=10	PAGES=E0136487	ISSN=1932-6203	PMID=26332211	DOI-ACCESS=FREE, It is designed to be a low-cost, image-based tracking system for the study of animal behavior and locomotion.

150px	alt=Example of a BeeTagg)|BeeTagg|A 2D code with honeycomb structures suitable for mobile tagging and was developed by the Swiss company connvision AG.

||Bokode

Automatic identification and data capture>data tag which holds much more information than a barcode over the same area. They were developed by a team led by Ramesh Raskar at the MIT Media Lab. The bokode pattern is a tiled series of Data Matrix codes.

128px)	Boxing barcode>Boxing	piqlFilm by Piql ASHTTPS://GITHUB.COM/PIQL/BOXING	WEBSITE=GITHUB	ACCESS-DATE=26 MARCH 2021	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20201221234210/HTTPS://GITHUB.COM/PIQL/BOXING, live,

| | Cauzin Softstrip| Softstrip code was used in the 1980s to encode software, which could be transferred by special scanners from printed journals into your computer hardware.

			DATE=15 JUNE 2009	FIRST =RUSS	ARCHIVE-URL= HTTPS://WEB.ARCHIVE.ORG/WEB/20110707082929/HTTP://WWW.ADAMS1.COM/STACK.HTML	URL-STATUS= LIVE,

128px)	ColorCode	ColorZipHTTP://WWW.COLORZIP.COM/ >TITLE=COLORZIP.COM	ACCESS-DATE=28 NOVEMBER 2011	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20141216204205/HTTP://COLORZIP.COM/		PUBLISHER=ADVERLAB	ACCESS-DATE=10 JUNE 2009	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20091208143758/HTTP://ADVERLAB.BLOGSPOT.COM/2006/01/BARCODES-FOR-TV-COMMERCIALS.HTML, live,

128px)	Color Construct Code	Color Construct Code is one of the few code symbologies designed to take advantage of multiple colors.HTTP://WWW.COLOURCODETECH.COM/ABOUT.HTML >TITLE=ABOUT	ACCESS-DATE=4 NOVEMBER 2012	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20120829213507/HTTP://WWW.COLOURCODETECH.COM/ABOUT.HTML		URL-STATUS= DEAD	TITLE=FREQUENTLY ASKED QUESTIONS	ACCESS-DATE= 4 NOVEMBER 2012,

128px)	Cronto Visual Cryptogram	University of Cambridge by Igor Drokov, Steven Murdoch, and Elena Punskaya.HTTPS://WWW.CAM.AC.UK/RESEARCH/NEWS/NEW-SYSTEM-TO-COMBAT-ONLINE-BANKING-FRAUD	ACCESS-DATE=21 JANUARY 2020	UNIVERSITY OF CAMBRIDGE >DATE=18 APRIL 2013	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20200726141647/HTTPS://WWW.CAM.AC.UK/RESEARCH/NEWS/NEW-SYSTEM-TO-COMBAT-ONLINE-BANKING-FRAUD	challenge–response authentication>challenge to compute a transaction authentication number using a security token.{{Citation	www.onespan.com/products/transaction-signing/cronto > title = Cronto Visual Transaction Signing	access-date = 6 December 2019	archive-url =web.archive.org/web/20191206163141/https://www.onespan.com/products/transaction-signing/cronto | url-status = live }}

	CyberCode>|From Sony.

		url=http://web.media.mit.edu/~enrico/research/research.php?projectTitle=d-touch	publisher=MIT	archive-url=https://web.archive.org/web/20080302032843web.media.mit.edu/~enrico/research/research.php?projectTitle=d-touch	url=http://web.media.mit.edu/~enrico/research/research.php?projectTitle=Sleight%20of%20Hands	publisher=MIT	archive-url=https://web.archive.org/web/20080621191310web.media.mit.edu/~enrico/research/research.php?projectTitle=Sleight%20of%20Hands |archive-date=21 June 2008 }}.

128px)	DataGlyphs	From Palo Alto Research Center (also termed Xerox PARC).See Xerox.com {{Webarchive	www.xerox.com/Static_HTML/xsis/dataglph.htm >date=7 June 2009 }} for details.Patented.WEB,www.microglyphs.com/english/html/dataglyphs.shtml, DataGlyphs: Embedding Digital Data, Microglyphs, 3 May 2006, 10 March 2014, 26 February 2014,www.microglyphs.com/english/html/dataglyphs.shtml," title="web.archive.org/web/20140226211404www.microglyphs.com/english/html/dataglyphs.shtml,">web.archive.org/web/20140226211404www.microglyphs.com/english/html/dataglyphs.shtml, live, DataGlyphs can be embedded into a half-tone image or background shading pattern in a way that is almost perceptually invisible, similar to steganography.WEB,www.tauzero.com/Rob_Tow/DataGlyph.html, “DataGlyph” Embedded Digital Data, Tauzero, 10 March 2014, 22 November 2013,www.tauzero.com/Rob_Tow/DataGlyph.html," title="web.archive.org/web/20131122020922www.tauzero.com/Rob_Tow/DataGlyph.html,">web.archive.org/web/20131122020922www.tauzero.com/Rob_Tow/DataGlyph.html, live, WEB,www.xerox.com/Static_HTML/xsis/dataglph.htm, DataGlyphs, Xerox, 10 March 2014, 23 November 2012,www.xerox.com/Static_HTML/xsis/dataglph.htm," title="web.archive.org/web/20121123144057www.xerox.com/Static_HTML/xsis/dataglph.htm,">web.archive.org/web/20121123144057www.xerox.com/Static_HTML/xsis/dataglph.htm, live,

128px)	Data Matrix	From Microscan Systems, formerly RVSI Acuity CiMatrix/Siemens. Public domain. Increasingly used throughout the United States. Single segment Data Matrix is also termed Semacode. – International Standard: ISO/IEC 16022.

	Datastrip Code>|From Datastrip, Inc.

|

Digimarc#Digimarc code>Digimarc code		ACCESS-DATE=19 JUNE 2017	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20161122153422/HTTPS://WWW.DIGIMARC.COM/DOCS/DEFAULT-SOURCE/SOLUTION-BRIEFS/BARCODEBRIEF.PDF?SFVRSN=4, dead,

	digital paper>| patterned paper used in conjunction with a digital pen to create handwritten digital documents. The printed dot pattern uniquely identifies the position coordinates on the paper.

|(File:35mm film audio macro.jpg|128px)|Dolby Digital|Digital sound code for printing on cinematic film between the threading holes

128px)	DotCode	Standardized as ISS DotCode Symbology Specification 4.0. Public domain. Extended 2D replacement of Code 128 barcode. At this time is used to track individual cigarette and pharmaceutical packages.

	Dot Code A>	Philips Dot Code.Dot Code A {{Webarchive>url=https://web.archive.org/web/20170509032225www.barcode.ro/tutorials/barcodes/dotcode-a.html		ACCESS-DATE=1 SEPTEMBER 2017	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20160310120100/HTTP://WWW.ADAMS1.COM/PATENTS/US4745269.PDF, live,

||sites.gs1us.org/mobilescan/home" title="web.archive.org/web/20170216045744sites.gs1us.org/mobilescan/home">DWCode

128px				ACCESS-DATE=28 NOVEMBER 2011	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20080820014344/HTTP://WWW.SCANBUY.COM/		TITLE=ONLINE QR CODE DECODER	ACCESS-DATE=9 JANUARY 2014	ARCHIVE-DATE=9 JANUARY 2014, dead,

128px)	Han Xin code	Code designed to encode Chinese characters, invented in 2007 by Chinese company The Article Numbering Center of China, introduced by Association for Automatic Identification and Mobility in 2011 and published as ISO/IEC 20830:2021 in 2021.

128px)	High Capacity Color Barcode	HCCB was developed by Microsoft; licensed by ISAN-IA.

	HueCode>		PUBLISHER=ADAMS	URL-STATUS=DEAD	ARCHIVE-DATE=3 NOVEMBER 2008,

	InterCode>|From Iconlab, Inc. The standard 2D Code in South Korea. All 3 South Korean mobile carriers put the scanner program of this code into their handsets to access mobile internet, as a default embedded program.

|(File:JAB_code_-_Pseudopedia_greetings_with_link.png|128px)|JAB Code|Just Another Bar Code is a colored 2D Code. Square or rectangle. License free

128px)	MaxiCode	Used by United Parcel Service. Now public domain.

||mCode

	WEBSITE=GRS.WEEBLY.COM	ARCHIVE-DATE=13 JANUARY 2019	URL-STATUS=LIVE, It is implementing an independent error detection technique preventing false decoding, it uses a variable-size error correction polynomial, which depends on the exact size of the code.

128px)	Messenger Codes	Proprietary ring-shaped code for Facebook Messenger. Defunct as of 2019, replaced by standard QR codes.

128px)	QR code#Micro QR code	>|Micro QR code is a smaller version of the QR code standard for applications where symbol size is limited.

128px)	MicroPDF417	>|MicroPDF417 is a restricted size barcode, similar to PDF417, which is used to add additional data to linear barcodes.

	Mobile Multi-Coloured Composite>MMCC	Designed to disseminate high capacity mobile phone content via existing colour print and electronic media, without the need for network connectivity

128px)	NexCode	NexCode is developed and patented by S5 Systems.

	Nintendo e-Reader#Dot code>Nintendo Dot code	Developed by Olympus Corporation to store songs, images, and mini-games for Game Boy Advance on Pokémon trading cards.

128px)	PDF417	Originated by Symbol Technologies. Public domain. – International standard: ISO/IEC 15438

|| Ocode

	ACCESS-DATE=2023-11-27	LANGUAGE=FR,

128px		Qode (barcode)>Qode	American proprietary and patented 2D Code from NeoMedia Technologies, Inc.

128px)

QR code

Initially developed, patented and owned by Denso Wave for automotive components management; they have chosen not to exercise their patent rights. Can encode Latin script

and Japanese Kanji and Kana characters, music, images, URLs, emails. De facto standard for Japanese cell phones. Used with BlackBerry Messenger to pick up contacts rather than using a PIN code. The most frequently used type of code to scan with smartphones, and one of the most widely used 2D Codes.CHEN

LAST2=YU

LAST3=XU

LAST4=WANG

LAST5=ZHAO

LAST6=TAN

DATE=2019-12-11

JOURNAL=SENSORS

VOLUME=19

PAGES=5466

PMC=6960674

BIBCODE=2019SENSO..19.5466C, free, Public Domain. – International Standard: ISO/IEC 18004

128px)	Rectangular Micro QR Code	>	QR Code Originated by Denso#Denso_Wave>Denso Wave . Public domain. – International standard: ISO/IEC 23941

			ACCESS-DATE=1 DECEMBER 2018	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20181202070442/HTTPS://PATENTS.JUSTIA.COM/PATENT/9270846		ACCESS-DATE=1 DECEMBER 2018	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20181202070452/HTTPS://PATENTS.JUSTIA.COM/PATENT/8180163	Hewlett-Packard Labs. A time-varying 2D pattern using to encode data via brightness fluctuations in an image, for the purpose of high bandwidth data transfer from computer displays to smartphones via smartphone camera input. Inventors Timothy Kindberg and John Collomosse, publicly disclosed at ACM HotMobile 2008.HTTP://PERSONAL.EE.SURREY.AC.UK/PERSONAL/J.COLLOMOSSE/PUBS/COLLOMOSSE-HOTM-2008.PDF	ACCESS-DATE=1 DECEMBER 2018	ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20191211051343/HTTP://PERSONAL.EE.SURREY.AC.UK/PERSONAL/J.COLLOMOSSE/PUBS/COLLOMOSSE-HOTM-2008.PDF, live,

128px)	ShotCode	Circular pattern codes for camera phones. Originally from High Energy Magic Ltd in name Spotcode. Before that most likely termed TRIPCode.

128px)

Snapcode, also called Boo-R code

Used by Snapchat, Spectacles (product)

, etc. US9111164B1HTTPS://WWW.THEVERGE.COM/2015/7/1/8861131/SNAPCHAT-UPDATE-2015-TAP-TO-PLAY-STORY

DATE=JULY 2015

ARCHIVE-DATE=27 JANUARY 2021

URL-STATUS=LIVE, HTTPS://TECHCRUNCH.COM/2015/01/28/SNAPTAGS/ >TITLE=“SNAPCHAT LETS YOU ADD PEOPLE VIA QR SNAPTAGS THANKS TO SECRET SCAN.ME ACQUISITION”

ACCESS-DATE=24 FEBRUARY 2017

ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20170224132115/HTTPS://TECHCRUNCH.COM/2015/01/28/SNAPTAGS/

DATE=4 MAY 2015

ARCHIVE-DATE=14 SEPTEMBER 2016

URL-STATUS=LIVE,

||Snowflake Code

	NUMBER=5825015	INVENTOR-LAST=CHAN	INVENTOR-FIRST=JOHN PAUL, HTTP://PDFPIW.USPTO.GOV/.PIW?DOCID=05825015&HOMEURL=HTTP%3A%2F%2FPATFT.USPTO.GOV%2FNETACGI%2FNPH-PARSER%3FSECT1%3DPTO2%2526SECT2%3DHITOFF%2526P%3D1%2526U%3D%25252FNETAHTML%25252FPTO%25252FSEARCH-BOOL.HTML%2526R%3D1%2526F%3DG%2526L%3D50%2526CO1%3DAND%2526D%3DPTXT%2526S1%3D5825015.PN.%2526OS%3DPN%2F5825015%2526RS%3DPN%2F5825015&PAGENUM=&RTYPE=&SECTIONNUM=&IDKEY=NONE&INPUT=VIEW+FIRST+PAGE>TITLE=US PATENT 5825015	WEBSITE=PDFPIW.USPTO.GOV	ARCHIVE-DATE=13 JANUARY 2019	URL-STATUS=LIVE,

128px)	SPARQCode	QR code encoding standard from MSKYNET, Inc.

||TLC39

Code 39 and MicroPDF417, forming a 2D pattern. It is also known as Telecommunications Industry Forum (TCIF) Code 39 or TCIF Linked Code 39.2023-08-09	URL=HTTPS://TRITONSTORE.COM.AU/WHAT-ARE-TLC39-BARCODES/	LANGUAGE=EN-AU,

||Trillcode

	DATE=17 FEBRUARY 2009	LANGUAGE=EN-US	ARCHIVE-DATE=26 JULY 2020	URL-STATUS=DEAD, Developed by Lark Computer, a Romanian company.HTTPS://BOOKS.GOOGLE.COM/BOOKS?ID=GHHPIMWIUX8C&Q=TRILLCODE&PG=PA73>TITLE=BARCODES FOR MOBILE DEVICES	FIRST1=HIROKO	FIRST2=KENG T.	FIRST3=DOUGLAS	PUBLISHER=CAMBRIDGE UNIVERSITY PRESS	LANGUAGE=EN,

	VOICEYE>|Developed and patented by VOICEYE, Inc. in South Korea, it aims to allow blind and visually impaired people to access printed information. It also claims to be the 2D Code that has the world’s largest storage capacity.

	WeChat#WeChat Mini Program>WeChat Mini Program code	A circular code with outward-projecting lines.GETTING MINI PROGRAM CODE >URL=HTTPS://DEVELOPERS.WEIXIN.QQ.COM/MINIPROGRAM/EN/DEV/FRAMEWORK/OPEN-ABILITY/QR-CODE.HTML, Weixin public doc,

Example images

File:UPC-A-036000291452.png|GTIN-12 number encoded in UPC-A barcode symbol. First and last digit are always placed outside the symbol to indicate Quiet Zones that are necessary for barcode scanners to work properlyFile:EAN-13-5901234123457.svg|EAN-13 (GTIN-13) number encoded in EAN-13 barcode symbol. First digit is always placed outside the symbol, additionally right quiet zone indicator (>) is used to indicate Quiet Zones that are necessary for barcode scanners to work properlyFile:Code93.png|“Pseudopedia” encoded in Code 93File:Code39.png|“*WIKI39*” encoded in Code 39File:Pseudopedia barcode 128.svg|’Pseudopedia” encoded in Code 128File:Codablock-F Example.png|An example of a stacked barcode. Specifically a “Codablock” barcode.File:Better Sample PDF417.png|PDF417 sampleFile:Lorem Ipsum.png|Lorem ipsum boilerplate text as four segment Data Matrix 2DFile:Azteccodeexample.svg|“This is an example Aztec symbol for Pseudopedia” encoded in Aztec CodeFile:EZcode.png|Text ‘EZcode’File:High Capacity Color Barcode.png| High Capacity Color Barcode of the URL for Pseudopedia’s article on High Capacity Color BarcodeFile:Dataglyph511140.png|“Pseudopedia, The Free Encyclopedia” in several languages encoded in DataGlyphsFile:35mm film audio macro.jpg|Two different 2D barcodes used in film: Dolby Digital between the sprocket holes with the “Double-D” logo in the middle, and Sony Dynamic Digital Sound in the blue area to the left of the sprocket holesFile:WikiQRCode.svg|The QR Code for the Pseudopedia URL. “Quick Response”, the most popular 2D barcode. It is open in that the specification is disclosed and the patent is not exercised.(æ ª)デンソーウェーブ {{Webarchive|url=https://web.archive.org/web/20120607102221www.denso-wave.com/qrcode/qrstandard-e.html |date=7 June 2012 }}, denso-wave.com {{in lang|ja}} CopyrightFile:MaxiCode.svg|MaxiCode example. This encodes the string “Pseudopedia, The Free Encyclopedia“File:Shotcode.png|ShotCode sampleFile:Twibright Optar Detail Scanned.png|detail of Twibright Optar scan from laser printed paper, carrying 32 kbit/s Ogg Vorbis digital music (48 seconds per A4 page)File:KarTrak code.jpg|A KarTrak railroad Automatic Equipment Identification label on a caboose in Florida

In popular culture

In architecture, a building in Lingang New City by German architects Gerkan, Marg and Partners incorporates a barcode design,WEB, 2009, Barcode Halls, Standard Facades for Manufacturing Buildings - Projects - gmp Architekten,www.gmp.de/en/projects/549/barcode-halls-standard-facades-for-manufacturing-buildings, live,web.archive.org/web/20231216013407/https://www.gmp.de/en/projects/549/barcode-halls-standard-facades-for-manufacturing-buildings, 2023-12-16, 2023-12-16, www.gmp.de, en, as does a shopping mall called www.marlen-dress.ru/img/schtrih-kod.jpg" title="web.archive.org/web/20111026031424www.marlen-dress.ru/img/schtrih-kod.jpg">Shtrikh-kod (Russian for barcode) in Narodnaya ulitsa (“People’s Street“) in the Nevskiy district of St. Petersburg, Russia.WEB,peterburg2.ru/restplaces/2530.html, image, Peterburg2.ru, 28 November 2011, 10 November 2011,peterburg2.ru/restplaces/2530.html," title="web.archive.org/web/20111110051507peterburg2.ru/restplaces/2530.html,">web.archive.org/web/20111110051507peterburg2.ru/restplaces/2530.html, live, In media, in 2011, the National Film Board of Canada and ARTE France launched a web documentary entitled Barcode.tv, which allows users to view films about everyday objects by scanning the product’s barcode with their iPhone camera.WEB, Lavigne, Anne-Marie, Introducing Barcode.tv, a new interactive doc about the objects that surround us,blog.nfb.ca/2011/10/05/introducing-barcode/, NFB Blog, National Film Board of Canada, 7 October 2011, 5 October 2011, 11 October 2011,blog.nfb.ca/2011/10/05/introducing-barcode/," title="web.archive.org/web/20111011174058blog.nfb.ca/2011/10/05/introducing-barcode/,">web.archive.org/web/20111011174058blog.nfb.ca/2011/10/05/introducing-barcode/, live, NEWS, Anderson, Kelly, NFB, ARTE France launch ‘Bar Code’,realscreen.com/2011/10/06/nfb-and-arte-france-launch-bar-code/, 7 October 2011, Reelscreen, 6 October 2011, 10 October 2011,realscreen.com/2011/10/06/nfb-and-arte-france-launch-bar-code/," title="web.archive.org/web/20111010041947realscreen.com/2011/10/06/nfb-and-arte-france-launch-bar-code/,">web.archive.org/web/20111010041947realscreen.com/2011/10/06/nfb-and-arte-france-launch-bar-code/, live, In professional wrestling, the WWE stable D-Generation X incorporated a barcode into their entrance video, as well as on a T-shirt.weblink {{webarchive|url=https://web.archive.org/web/20150316205717www.attitudetees.com/items/dxbarcode.html|date=16 March 2015}}WEB,www.youtube.com/watch?v=BkvplmOtmX4,ghostarchive.org/varchive/youtube/20211211/BkvplmOtmX4, 2021-12-11, live, Dx theme song 2009–2010, YouTube, 19 December 2009, 10 March 2014, {{cbignore}}In the TV series Dark Angel, the protagonist and the other transgenics in the Manticore X-series have barcodes on the back of their necks.In video games, the protagonist of the Hitman video game series has a barcode tattoo on the back of his head; QR codes can also be scanned in a side mission in Watch Dogs.The 2018 videogame Judgment features QR Codes that protagonist Takayuki Yagami can photograph with his phone camera. These are mostly to unlock parts for Yagami’s Drone.WEB,www.eurogamer.net/articles/2019-06-26-judgment-qr-codes-drone-parts-6032, Diego Agruello, 27 June 2019, 3 August 2019, Judgment QR code locations to upgrade Drone Parts explained • Eurogamer.net, Eurogamer, 28 August 2019,web.archive.org/web/20190828223321/https://www.eurogamer.net/articles/2019-06-26-judgment-qr-codes-drone-parts-6032, live, In the films Back to the Future Part II and The Handmaid’s Tale, cars in the future are depicted with barcode licence plates.In the Terminator films, Skynet burns barcodes onto the inside surface of the wrists of captive humans (in a similar location to the WW2 concentration camp tattoos) as a unique identifier.In music, Dave Davies of the Kinks released a solo album in 1980, AFL1-3603, which featured a giant barcode on the front cover in place of the musician’s head. The album’s name was also the barcode number.The April 1978 issue of Mad Magazine featured a giant barcode on the cover, with the blurb “[Mad] Hopes this issue jams up every computer in the country...for forcing us to deface our covers with this yecchy UPC symbol from now on!“Interactive Textbooks were first published by Harcourt College Publishers to Expand Education Technology with Interactive Textbooks.WEB,cuecat.org/, CueCat History, CueCat History, en, 12 November 2019, 12 November 2019,web.archive.org/web/20191112235022/https://cuecat.org/, live,

Designed barcodes

Some brands integrate custom designs into barcodes (while keeping them readable) on their consumer products.File:Design Barcode Grasvodka IMG 5574.JPGFile:Barcode Tall Horse1.jpgFile:Hühner-Bouillon K Designbarcode 4337185009907 IMG 8716.jpgFile:Sardinendose K Barcode Art valid IMG11829.jpgFile:Barcode_peanut.jpg

Hoaxes about barcodes

There was minor skepticism from conspiracy theorists, who considered barcodes to be an intrusive surveillance technology, and from some Christians, pioneered by a 1982 book The New Money System 666 by Mary Stewart Relfe, who thought the codes hid the number 666, representing the “Number of the Beast”.WEB,www.av1611.org/666/barcode.html, What about barcodes and 666: The Mark of the Beast?, Av1611.org, 1999, 14 March 2014, 27 November 2013,www.av1611.org/666/barcode.html," title="web.archive.org/web/20131127041006www.av1611.org/666/barcode.html,">web.archive.org/web/20131127041006www.av1611.org/666/barcode.html, live, Old Believers, a separation of the Russian Orthodox Church, believe barcodes are the stamp of the Antichrist.WEB, The Russian Family That Cut Itself Off From Civilization for More Than 40 Years,www.mentalfloss.com/article/551659/karp-lykov-russian-family-secluded-from-civilization-40-years, Mental Floss, Jay, Serafino, July 26, 2018, May 6, 2020, 7 May 2020,web.archive.org/web/20200507041702/https://www.mentalfloss.com/article/551659/karp-lykov-russian-family-secluded-from-civilization-40-years, live, Television host Phil Donahue described barcodes as a “corporate plot against consumers”.WEB,www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2004/07/05/BUG6Q7G4AJ1.DTL&type=business,www.sfgate.com/cgi-bin/article.cgi?file=%2Fchronicle%2Farchive%2F2004%2F07%2F05%2FBUG6Q7G4AJ1.DTL&type=business," title="web.archive.org/web/20040823004929www.sfgate.com/cgi-bin/article.cgi?file=%2Fchronicle%2Farchive%2F2004%2F07%2F05%2FBUG6Q7G4AJ1.DTL&type=business,">web.archive.org/web/20040823004929www.sfgate.com/cgi-bin/article.cgi?file=%2Fchronicle%2Farchive%2F2004%2F07%2F05%2FBUG6Q7G4AJ1.DTL&type=business, 23 August 2004, UPC bar code has been in use 30 years, Bishop, Tricia, SFgate.com, 5 July 2004, 22 December 2009, dead,

See also

{{div col}}

• Automated identification and data capture (AIDC)
• Barcode printer
• Campus card
• European Article Numbering-Uniform Code Council
• Global Trade Item Number
• Identifier
• Inventory control system
• Object hyperlinking
• Semacode
• SPARQCode (QR code)
• List of GS1 country codes

{{div col end}}

References

{{Reflist|30em}}

Further reading

• Automating Management Information Systems: Barcode Engineering and Implementation – Harry E. Burke, Thomson Learning, {{ISBN|0-442-20712-3}}
• Automating Management Information Systems: Principles of Barcode Applications – Harry E. Burke, Thomson Learning, {{ISBN|0-442-20667-4}}
• The Bar Code Book – Roger C. Palmer, Helmers Publishing, {{ISBN|0-911261-09-5}}, 386 pages
• The Bar Code Manual – Eugene F. Brighan, Thompson Learning, {{ISBN|0-03-016173-8}}
• Handbook of Bar Coding Systems – Harry E. Burke, Van Nostrand Reinhold Company, {{ISBN|978-0-442-21430-2}}, 219 pages
• Information Technology for Retail:Automatic Identification & Data Capture Systems – Girdhar Joshi, Oxford University Press, {{ISBN|0-19-569796-0}}, 416 pages
• Lines of Communication – Craig K. Harmon, Helmers Publishing, {{ISBN|0-911261-07-9}}, 425 pages
• Punched Cards to Bar Codes – Benjamin Nelson, Helmers Publishing, {{ISBN|0-911261-12-5}}, 434 pages
• Revolution at the Checkout Counter: The Explosion of the Bar Code – Stephen A. Brown, Harvard University Press, {{ISBN|0-674-76720-9}}
• Reading Between The Lines – Craig K. Harmon and Russ Adams, Helmers Publishing, {{ISBN|0-911261-00-1}}, 297 pages
• The Black and White Solution: Bar Code and the IBM PC – Russ Adams and Joyce Lane, Helmers Publishing, {{ISBN|0-911261-01-X}}, 169 pages
• Sourcebook of Automatic Identification and Data Collection – Russ Adams, Van Nostrand Reinhold, {{ISBN|0-442-31850-2}}, 298 pages
• Inside Out: The Wonders of Modern Technology – Carol J. Amato, Smithmark Pub, {{ISBN|0831746572}}, 1993

External links

{{Commons category|Barcode}}

• {{curlie|Computers/Data_Formats/Barcodes/|Barcode}}
• Free Online Barcode Generator.

{{Barcodes}}{{Paper data storage media}}{{Authority control}}