Bar code consists of a set of bars, empty symbols arranged according to certain encoding rules for certain information indicating characters, numbers and symbols that. Bar code automatic identification system is a bar code symbol by the system design, production and scanning reading thereof.

Barcode encoding (code system) Description:

Many types of one-dimensional bar code, there are about two dozen common code system, including:

Code39 code (Standard 39 yards), Codabar code (Codabar), Code25 code (Standard 25 yards), ITF25 code (cross 25 yards), Matrix25 code (matrix 25 yards), UPC-A codes, UPC-E code , EAN-13 code (EAN-13 barcode international commodity), EAN-8 code (EAN-8 barcode international commodity), China postal code (matrix 25 yards a variant), code-B code, MSI code ,, Code11 code, Code93 codes, ISBN code, ISSN code, Code128 code (Code128 yards, including EAN128 yards), Code39EMS (EMS-specific 39 yards) and other one-dimensional bar codes and PDF417 two-dimensional bar code.

At present, the international bar code types are widely used in EAN, UPC code (barcode, used in the world that uniquely identifies a commodity. Our most common in the supermarket is this bar code), Code39 codes (numbers and letters can be expressed in the most widely used management field), ITF25 code (in logistics management more), Codebar code (used for medical, library area), Code93 code, Code128 codes. Wherein, EAN code is the world of goods bar code use, it has become the basis for electronic data interchange (EDI) of; UPC code mainly for the United States and Canada; in all kinds of bar code application system, Code39 code because it can be digital and the way the letters are composed of widely used in various sectors of the internal management; in blood banks, libraries, and Zhao Xiangguan business, Codebar code is also being widely used.

In addition to the above listed one-dimensional bar codes, two-dimensional bar code has also been rapid development, and in many areas have found application.

Common Barcode Description:

EAN code:

EAN code is a commodity international EAN bar code developed by GM in the world. EAN code symbols have the standard version (EAN-13) and a shortened version (EAN-8) are two kinds of general merchandise barcode its equivalent. On our daily purchased the bar code printed on the packaging in general is EAN code.

UPC code:

UPC code is a product developed by the Uniform Code Council with a bar code, mainly for the United States and Canada, we can see that in the United States imported goods.

39 yards:

39 yards is a bar code can represent numbers, letters, and other information, mainly for industrial, automation books and ticket management, currently used widely.

Codabar (Codebar) Code:

Codabar numbers and letters can also represent information, mainly used for automatic identification of health, library information, materials and other fields.

QR code:

One-dimensional bar code carried by the limited amount of information, such as a bar code on the goods can only accommodate 13 (EAN-13 code) Arabic numerals, more information can only rely on the support of the product database, leaving the pre-built database, this bar code does not make sense, so to some extent also limits the scope of application of the bar code. For this reason, in the 1990s he invented a two-dimensional bar code. A two-dimensional bar code in addition to the advantages of one-dimensional bar code, the same time there are large amount of information, high reliability, confidentiality, security, and other advantages.

Currently there are PDF417 two-dimensional bar code, Code49 codes, Code 16K code, Data Matrix code, MaxiCode codes, divided into rows of stacked layers or matrix type and board or two categories.

QR code as a new information storage and transmission technology, from the time of birth on the subject of widespread concern in the international community. After years of efforts, it is now used in national defense, public safety, transportation, health care, industrial, commercial, financial, customs and government management and other fields.

Dimensional bar code information to rely on its huge carrying capacity, when used in the past to be able to one-dimensional bar codes stored in the database in the background information contained in the bar code, the corresponding information can be obtained directly by reading the bar code and two-dimensional bar code as well as error correction technology and security features, increased data security.

Two-dimensional bar code can be put photographs, fingerprints prepared therein, can effectively solve documents and machine-readable security issues. Therefore, can be widely used in passports, identity cards, driving license, military cards, health cards, insurance cards and so on.

And a dozen US states Arizona driver's license, US military card, military medical certificates and other several years ago adopted the PDF417 technology. Personal information and photographs on the document compiled in a two-dimensional bar code, not only can automatically read identification, and can effectively prevent counterfeiting of documents incidents. Philippines, Egypt, Bahrain and many other countries have adopted a two-dimensional bar code on the ID card or driver's license, a passport of the Hong Kong Special Administrative Region also uses a two-dimensional bar code technology.

Also in the customs declarations, long distance shipper, tax statements, insurance and registration forms also have the use of two-dimensional bar code technology to solve data input and prevent forgery, falsification forms example.

In parts of China's CPA license and car sales and after-sales service and so on, two-dimensional bar code has also been a preliminary application.