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It is method of automatic identification and data collection.

History of Bar Codes

 The first patent for a bar code type product (US Patent #2,612,994)

was issued to inventors Joseph Woodland and Bernard Silver onOctober 7, 1952. The Woodland and Silver bar code can be describedas a "bull's eye" symbol, made up of a series of concentric circles.

Examine the 1958 patent drawing (see first image) that depicts theWoodland's and Silver's bar code label and the 1958 patent drawing(see second image)of the inventors' bar code scanner technology. Thephoto below left is an example of today's U.P.C. bar code on a productpackage.

In 1948, Bernard Silver was a graduate student at Drexel Institute of  Technology in Philadelphia. A local food chain store owner had madean inquiry to the Drexel Institute asking about research into a methodof automatically reading product information during checkout. BernardSilver joined together with fellow graduate student Norman JosephWoodland to work on a solution.

Woodland's first idea was to use ultraviolet light sensitive ink. Theteam built a working prototype but decided that the system was toounstable and expensive. They went back to the drawing board.

On October 20, 1949, Woodland and Silver filed their patentapplication for the "Classifying Apparatus and Method", describingtheir invention as "article classification...through the medium of identifying patterns".

Bar Code - Commercial Use

Bar code was first used commercially in 1966, however, it was soonrealized that there would have to be some sort of industry standardset. By 1970, the Universal Grocery Products Identification Code or

UGPIC was written by a company called Logicon Inc. The first companyto produce bar code equipment for retail trade use (using UGPIC) wasthe American company Monarch Marking in 1970, and for industrialuse, the British company Plessey Telecommunications was also first in1970. UGPIC evolved into the U.P.C. symbol set or Universal ProductCode, which is still used in the United States. George J. Laurer isconsidered the inventor of U.P.C. or Uniform Product Code, which wasinvented in 1973.

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In June of 1974, the first U.P.C. scanner was installed at a Marsh'ssupermarket in Troy, Ohio. The first product to have a bar codeincluded was a packet of Wrigley's Gum.

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.[10]

Use

Barcodes such as the UPC have become a ubiquitous element of modern civilization. Some

modern applications of barcodes include:

Almost every item other than fresh produce from a grocery store, department store,

and mass merchandiser has a UPC barcode on it.[citation needed ] This helps track items and also

reduces instances of shoplifting involving price tag swapping, although shoplifters can now

print their own barcodes.[citation needed ]

Barcodes are widely used in shop floor control applications software where employees

can scan work orders and track the time spent on a job.

Retail chain membership cards (issued mostly by grocery stores and specialty "big box"

retail stores such as sporting equipment, office supply, or pet stores) use bar codes to

uniquely identify a consumer. Retailers can offer 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.

Example of barcode on a patient identification wristband

When used on patient identification, barcodes permit clinical staff to instantly access

patient data, including medical history, drug allergies, etc.

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Document Management  tools often allow for barcoded sheets to facilitate the separation

and indexing of documents that have been imaged in batch scanning applications.

Barcoded parcel

The tracking of item movement, including rental cars, airline luggage, nuclear 

waste, registered mail, express mail and parcels.

Tracking the organization of species in biology. The barcode assigned is based on the

CO1 gene.[11]

Since 2005, airlines use an IATA-standard 2D barcode on boarding passes (BCBP), and

since 2008 2D barcodes sent to mobile phones enable electronic boarding passes.[12]

Recently,[when? ] researchers placed tiny barcodes on individual bees to track the insects'

mating habits.

Barcoded entertainment event tickets allow the holder to enter sports arenas, cinemas,

theatres, fairgrounds, transportation, etc. This can allow the proprietor to identify duplicate or 

fraudulent tickets more easily.

They can track the arrival and departure of vehicles from rental facilities.

Barcodes can integrate with in-motion checkweighers to identify the item being weighed

in a conveyor line for data collection

Some 2D barcodes embed a hyperlink to a web page. A capable cellphone might be

used to read the barcode and browse the linked website, which can help a shopper find the

best price for an item in the vicinity.

In the 1970s and 1980s, software source code was occasionally encoded in a barcodeand printed on paper. Cauzin Softstrip and Paperbyte[13] are barcode symbologies specifically

designed for this application.

The 1991 Barcode Battler computer game system, used any standard barcode to

generate combat statistics.

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In 1992 the Veterans Health Administration developed Bar Code Medication

Administration system (BCMA).

In the 21st century many artists started using barcodes in art, such as Scott Blake's

Barcode Jesus, as part of the post-modernism movement.

Today, barcodes are issued by GS1, the most widely used supply chain standards

system in the world.[14]

Quality control and verification

Barcode verification examines scanability and the quality of the barcode in comparison to industry

standards and specifications. Barcode verifiers are primarily used by businesses that print and

use barcodes. Any trading partner in the supply chain can test barcode quality. It is important to

verify a barcode to ensure that any reader in the supply chain can successfully interpret a bar 

code with a low error rate. Retailers levy large penalties for non-compliant barcodes. These

chargebacks can reduce a manufacturer's revenue by 2% to 10%.[15]

Barcode verifiers work like a readers, but instead of simply decoding a barcode, a verifier 

performs a series of tests. For linear barcodes these tests are:

Edge Determination

Minimum Reflectance

Symbol Contrast

Minimum Edge Contrast

Modulation

Defects

Decode

Decodability

2D matrix symbols look at the parameters:

Symbol Contrast

Modulation

Decode

Unused Error Correction

Fixed (finder) Pattern Damage

Grid Non-uniformity

Axial Non-uniformity[16]

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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 minimum acceptable symbol grade.[17]

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.

Barcode verifier standards

Barcode verifiers should comply with the ISO/IEC 15426-1 (linear) or ISO/IEC 15426-2

(2D).

This standard defines the measuring accuracy of a bar code verifier.

The current international barcode quality specification is ISO/IEC 15416 (linear) and

ISO/IEC 15415 (2D). 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).

This standard defines the quality requirements for barcodes and Matrix Codes (also called Optical

Codes).

As of 2011 the ISO workgroup JTC1 SC31 was developing a Direct Part Marking

(DPM) quality standard : ISO/IEC TR 29158.[18]

International standards are available from the International Organization for Standardization

(ISO).[19]

These standards are also available from local/national standardization organizations, such as

ANSI, BSI, DIN, NEN and others.

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:

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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.

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

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, qty 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.[20][unreliable source? ] The exact

error rate depends on the type of barcode.

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