Barcode and its types
From Wikipedia and others websites (see links at page end).
A barcode is an optical machine-readable representation of data, which shows data about the object to which it attaches. Originally, barcodes represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or 1 dimensional (1D). Later they evolved into rectangles, dots, hexagons and other geometric patterns in 2 dimensions (2D). Although 2D systems use a variety of symbols, they are generally referred to as barcodes as well. Barcodes originally were scanned by special–optical scanners called barcode readers, scanners and interpretive software are available on devices including desktop printers and smartphones. The first use of barcodes was to label railroad cars, but they were not commercially successful until they were used to automate supermarket checkout systems, a task for which they have become almost universal. Their use has spread to many other tasks that are generically referred to as Auto ID Data Capture (AIDC). Other systems are attempting to make inroads in the AIDC market, but the simplicity, universality and low cost of barcodes has limited the role of these other systems.

Current code

mixThe UPC encodes 12 decimal digits as SLLLLLLMRRRRRRE, where S (start) and E (end) are the bit pattern 101, M (middle) is the bit pattern 01010 (called guard bars), and each L (left) and R (right) are digits, each one represented by a seven-bit code. This is a total of 95 bits. The bit pattern for each numeral is designed to be as little like the others as possible, and to have no more than four consecutive 1s or 0s in order. Both are for reliability in scanning.
Since S, M, and E all include two bars, and each of the 12 digits of the UPC-A barcode consists of two bars and two spaces, all UPC-A barcodes consist of exactly (3×2)+(12×2)=30 bars.
The UPC has only numerals, with no letters or other characters. The first digit L is the prefix. The last digit R is an error correcting check digit, allowing some errors in scanning or manual entry to be detected. UPC data structures are a component of GTINs (Global Trade Item Numbers). All of these data structures follow the global GS1 standards.

Global Trade Item Number (GTIN) is an identifier for trade items developed by GS1 (comprising the former EAN International and Uniform Code Council). Such identifiers are used to look up product information in a database (often by inputting the number through a bar code scanner pointed at an actual product) which may belong to a retailer, manufacturer, collector, researcher, or other entity. The uniqueness and universality of the identifier is useful in establishing which product in one database corresponds to which product in another database, especially across organizational boundaries.

GS1, founded in 1977, is an international not-for-profit association dedicated to the development and implementation of global standards and solutions to improve the efficiency and visibility of supply and demand chains globally and across multiple sectors. The GS1 System of standards is the most widely-used supply-chain standards system in the world.
GS1's main activity is the development of the GS1 System, a series of standards designed to improve supply-chain management.
The GS1 System is composed of four key standards: Barcodes (used to automatically identify things), eCom (electronic business messaging standards allowing automatic electronic transmission of data), GDSN (Global Data Synchronisation standards which allow business partners to have consistent item data in their systems at the same time) and EPCglobal (which uses RFID technology to immediately track an item).

The main barcode types found on fruitstickers or on other labels that are found on fruit are: EAN-13, EAN-8, UPC-A, UPC-E and GS1 DataBar Stacked.

EAN-13

An EAN-13 barcode (originally "European Article Number", but now renamed ”International Article Number” even though the abbreviation has been retained) is a 13 digit (12 + check digit) barcoding standard which is a superset of the original 12-digit Universal Product Code (UPC) system developed in the United States. The EAN-13 barcode is defined by the standards organisation GS1.
The EAN-13 barcodes are used worldwide for marking products often sold at retail point of sale. The numbers encoded in EAN-13 bar codes are product identification numbers, which are also called Japanese Article Number (JAN) in Japan. All the numbers encoded in UPC and EAN barcodes are known as Global Trade Item Numbers (GTIN), and they can be encoded in other GS1 barcodes.

EAN-13 is used world-wide for marking retail goods. The symbol encodes 13 characters: the first two or three are a country code which identify the country in which the manufacturer is registered (not necessarily where the product is actually made). The country code is followed by 9 or 10 data digits (depending on the length of the country code) and a single digit check-sum. 2-digit and 5-digit supplemental barcodes may be added for a total of 14 or 17 data digits.
EAN-13 is very common on Melons stickers, mainly for European market while in USA market UPC­A is preferred

EAN-8

mix The less commonly used EAN-8 barcodes are used also for marking retail goods; however, they are usually reserved for smaller items, for example confectionery.

EAN-8 is a shortened version of the EAN-13 code. It includes a 2 or 3 digit country code, 4 of 5 data digits (depending on the length of the country code), and a checksum digit. While it is possible to add a 2-digit or 5-digit extension barcode, the primary purpose of the EAN-8 code is to use as little space as possible.
Unlike the UPC-E symbol, which compresses data that could also be printed as a full-size UPC-A symbol by squeezing out zeroes, the data digits in an EAN-8 symbol specifically identify a particular product and manufacturer. Since a limited number of EAN-8 codes are available in each country, they are issued only for products with insufficient space for a normal EAN-13 symbol. For example, a 2-digit country code permits a total of only 100,000 item numbers.
EAN-8 is largely used on Flag labels for little fruit packets.

UPC-A

mix UPC-A is used for marking products which are sold at retail in the USA. The barcode identifies the manufacturer and specific product so point-of-sale cash register systems can automatically look up the price. The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the U.S.A. by the Uniform Code Council located in Dayton, Ohio.
Common in USA market especially on Melons and Watermelons.

UPC-E

mix UPC-E is a variation of the UPC-A symbol that is used for number system 0. By suppressing zeroes, UPC-E codes can be printed in a very small space and are used for labeling small items.
The UPC-E code is a compressed barcode which is intended for use on small items. Compression works by squeezing extra zeroes out of the barcode and then automatically re-inserting them at the scanner. Only barcodes containing zeroes are candidates for the UPC-E symbol.

GS1

GS1

GS1 DataBar Stacked Omnidirectional

GS1 DataBar barcode symbology is the latest barcode type for space-constrained identification from GS1 formerly EAN International and the Uniform Code Council, Inc. DataBar barcodes have been utilized to solve many problems in POS (Point of sale), grocery and healthcare, where items are too small to allow for traditional barcode types, or where additional information needs to be encoded such as product weight, expiration dates, country of origin or serial numbers. DataBar is also the only barcode symbology approved by GS1 to encode GTIN-14 numbers in all retail checkout systems after January 1, 2010 and is required by the Joint Industry Coupon Committee (JICC) to be used for DataBar Coupon Barcodes.
GS1 renamed the RSS Symbology (Reduced Space Symbology) to GS1 DataBar to avoid confusion with popular RSS XML Feed technology. The new name does not change the standard, however, and any documentation that refers to RSS Symbology is the same as GS1 DataBar.
GS1 DataBar Stacked Omnidirectional is designed to condense the GTIN information into a more compact and square barcode suitable for use on smaller packages (such as the label stickers on fresh produce).

GS1 DataBar Family (from Morovia)

VariantData EncodedPOSApplicationsSample Barcode
DataBar Omnidirectional14-digit GTINYesPackaged goods
DataBar Stacked Omnidirectional14-digit GTINYesPackaged goods, Produce
DataBar ExpandedAny GS1-128 data, up to 74 digits or 41 alphanumericYesVariable-measure food, Coupons
DataBar Expanded StackedAny GS1-128 data, up to 74 digits or 41 alphanumericYesVariable-measure food, Coupons
DataBar Truncated14-digit GTINNoHealth care item
DataBar Stacked14-digit GTINNoHealth care item
DataBar Limited14-digit GTINNoHealth care item
Among the seven variants, four, DataBar-14, DataBar Stacked Omnidirectional, DataBar Expanded and DataBar Expanded Stacked were designed and specifically to work at retail POS because they can be omnidirectionally read. The remaining three, DataBar Truncated, DataBar Stacked, and DataBar Limited, are not recommended to work at retail POS and were designed for very very small products (such as health-care items).

Bidimensional code

The previous ones are linear barcodes, there are also two-dimensional with a lot of type but in our case (the fruit and vegetable labels) you find only QR code. In recent years there was a proliferation in some labels but also in many other cases (advertising, event posters, etc.) of QR code (Quick Response), mixthis is an array of black squares on a white background.
The QR code was developed in 1994 by the Japanese company Denso Wave, for the purpose of tracking the car parts in Toyota factories. mixIn regard of code's ability to contain more data than a barcode was later used for the management of stocks by different industries.
As you can see in the attached figure the QR code is a matrix with 3 large squares (at three corners) and a smaller one (which give alignment), around the 3 larger squares are placed information about version and format, the rest of the field contains informations and keys to error correction. Around the square there is a white band that serves to delimit the area to be scanned by the app that reads the code.
A Data Matrix code is a two-dimensional matrix barcode consisting of black and white "cells" or modules arranged in either a square or rectangular pattern. Data Matrix was invented by International Data Matrix, Inc. (ID Matrix) which was merged into RVSI/Acuity CiMatrix, who were acquired by Siemens AG in October, 2005 and Microscan Systems in September 2008. Data Matrix is covered today by several ISO/IEC standards and is in the public domain for many applications, which means it can be used free of any licensing or royalties. Data Matrix symbols are made up of modules arranged within a perimeter finder and timing pattern. mixmixIt can encode up to 3,116 characters from the entire ASCII character set (with extensions). The symbol consists of data regions which contain modules set out in a regular array. Large symbols contain several regions. Each data region is delimited by a finder pattern, and this is surrounded on all four sides by a quiet zone border (margin). The code can be read easily from a mobile phone or a smartphone through an ad hoc app. Theoretically it is possible to register into one cryptogram up to 7,089 numeric characters or 4,296 alphanumeric or 2953 bytes; in practice, in most cases, they are used to store the internet address of the product or event to which they relate.

Some links to barcode theme

Barcode on Wikipedia
Different Types of Barcodes
Agamik Barcoding
IDAutomation Barcode FAQ & Tutorial
GS1 DataBar Barcode FAQ and Tutorial
Supported Barcode Types
IDAutomation: How to Identify a Barcode, pictures for 33 types
Barcodes, readers, scanners, fonts, software
Barcode Types
Barcode fonts
Barcode: picture and informations on 40 types
GS1
Search from barcode to enterprise informatioons
QR code on Wikipedia
Datamatrix code on Wikipedia
Create your own QR code
Create your own Data Matrix code

Barcodes for fun

Onlineweblibrary BLOG
Pictures of barcode vector
Perché il codice a barre?
Kyoko
Architettura e design
Bar-code-revolution
Freedom
Upstate fancy
QRcodes


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  EAN-13
Only barcode on melon
French melons for Europe


Chiquita stickers, exist also with EAN-8, UPC-A and GS1 barcode

Jaffa pomelo from Israel

Passiflora fruit

Avocado sticker
EAN-13 on Flag label put on a 1 Kg packet of italian peach


EAN-13 on label for a russian parsley packet

  EAN-8

Avocado sticker

French melons sticker

Chiquita stickers, exist also with EAN-13, UPC-A and GS1 barcode. Image from fruitsticker.de site

Squash from Spain
EAN-8 on Flag label put on a 1 Kg packet of italian peach

Kiwi sticker

  UPC-A
Two stickers for Melon on the same fruit: first classic, second with UPC-A barcode

USA Watermelon

Cardboard label for Ananas from Costarica

Chiquita stickers, exist also with EAN-13, EAN-8 and GS1 barcode




Plastic label for Sweet Baby Broccoli

  GS1


Del Monte banana from Ecuador


Chiquita stickers, exist also with EAN-13, EAN-8 and UPC-A barcode


Apple sticker


Grapefruit sticker
GS1 DataBar Truncated on Avocado fruitsticker

  Bidimensional codes

A Datamatrix bidimensional code with different side dimensions


QR code on a watermelon label
QR code on an apple small label
Datamatrix code together with an UPC-A barcode


   Divers
Also if numbers are continuous it is possible to detect an EAN-13 barcode, see 2 bars at extremities and 2 in the middle

Also if numbers are continuous it is possible to detect an EAN-13 barcode
Also if numbers are continuous it is possible to detect an EAN-8 barcode
a very short EAN-13 barcode on a Lorenzini melon by which is possible to trace each fruit

It look like a Codabar
Blue Whale Label on a grape box with a 8 digit and a 25 digit (may be EAN-128) barcodes