GB/T 12905-2019.Bar code terminology.
Bar code terminology
1 Scope
GB/T 12905 defines the terms and definitions of bar code basics, code system, bar code reading, bar code symbol production, bar code symbol detection, etc.
GB/T 12905 is applicable to research and applications related to bar code technology. ||
tt||2 Basic terminology
2.1
Bar code bar code
A symbol composed of a group of regularly arranged bars and spaces that can be read by machines to represent certain information. It includes one-dimensional bar code (2.2) and two-dimensional bar code (2.3).
2.2
One-dimensional bar code linear bar code; one-dimensional bar code
A bar code symbol that only represents information in one dimension.
2.3
two-dimensional bar code;2D code
two-dimensional code
a bar code symbol that represents information in two dimensions.
2.4
symbology
regulations on the type of bar code symbol, data representation method, encoding capacity and bar code character set.
2.5
bar code system
a system consisting of bar code symbol design, production and scanning and reading.
2.6
bar; dark bar; black bar
a part of a bar code symbol with low reflectivity.
2.7
space; light bar
a part of a bar code symbol with high reflectivity.
2.8
Start character start character; start cipher; start code
Several bars and spaces located at the start of a barcode symbol.
2.9
Stop character stop character; stop cipher; stop code
Several bars and spaces located at the end of a barcode symbol.
2.10
Clear area clear area; quiet zone; quiet area; clear zone
Limited area on the outside of a barcode symbol with the same reflectivity as the space.
This standard defines the terms and their definitions in the areas of barcode basics, code system, barcode reading, barcode symbol production, and barcode symbol detection. This standard applies to research and applications related to barcode technology.

ICS35.040
National Standard of the People's Republic of China
GB/T12905—2019
Replaces GB/T12905—2000
Bar code terminology
Bar code terminology
2019-03-25 Issued
State Administration for Market Regulation
Standardization Administration of the People's Republic of China
Implementation on 2019-10-01
Basic terminology
3 Code system
Bar code reading
Bar code symbol production
Bar code symbol detection
GB/T12905—2019
This standard was drafted according to the rules given in GB/T1.1-2009. GB/T12905—2019
This standard replaces GB/T12905—2000 "Barcode Terminology". Compared with GB/T12905—2000, this standard has the following major technical changes:
The scope of the original standard is adjusted and arranged according to the system, which is divided into six parts: scope, basic terms, code system, barcode reading, barcode symbol production, and barcode symbol detection.
Related terms such as two-dimensional barcode and commodity barcode are added, with a total of 75 items added. 34 non-common terms are deleted
The explanations of 43 items are revised.
This standard is proposed and managed by the National Technical Committee for Logistics Information Management Standardization (SAC/TC267). The drafting organizations of this standard are: China Article Coding Center, Ningbo Yongbiao Article Coding Center, Ningbo Standardization Research Institute, Zhejiang Article Coding Center, Beijing Jiaotong University, Shandong Standardization Research Institute, Qingdao Standardization Research Institute, Hebei Standardization Research Institute, Xinjiang Uygur Autonomous Region Standardization Research Institute, Shaanxi Standardization Research Institute, Henan Standardization Research Institute, Chongqing Quality and Standardization Research Institute, Shanxi Standardization Research Institute, Inner Mongolia Autonomous Region Standardization Institute, Changxiang IoT (Beijing) Technology Development Co., Ltd. The main drafters of this standard are: Li Sucai, Lou Qinghua, Zhu Yuefeng, Du Jingrong, Ge Weisan, Ruan Xiaohua, Ding Wei, Hou Hanping, Han Shuwen, Zhang Yongpei, Xing Yanlin, Li Congfen, Liu Lizhen, Liao Quanhong, He Guoqing, Ning Jirong, Gao Juan, Chen Zhenyu, Zhang Qiuxia, Gu Haitao, Zhang Hong. The previous versions of the standards replaced by this standard are: GB/T12905-1991.GB/T12905-20001Scope
Barcode terms
GB/T12905—2019
This standard defines the terms and definitions of barcode basics, code system, barcode reading, barcode symbol production, barcode symbol detection, etc. This standard applies to research and applications related to barcode technology. Basic terms
Barcode barcode
A symbol composed of a group of regularly arranged bars and spaces that can be read by machines to represent certain information, including one-dimensional barcodes (2.2) and two-dimensional barcodes (2.3).
Linear bar code; one-dimensional bar codeOne-dimensional bar code
Barcode symbol that only represents information in one dimension. 2.3
Two-dimensional bar code
Two-dimensional bar code
two-dimensional bar code:2D codeBar code symbol that represents information in two dimensions. 2.4
symbology
Regulations on the characteristics of bar code symbols, data representation methods, encoding capacity and bar code character set. 2.5
Ebar code system
Bar code system
A system composed of bar code symbol design, production and scanning and reading. 2.6
Bar; darkbar; blackbar
The part of a bar code symbol with low reflectivity. 2.7
Espace, light bar
The part of a bar code symbol with high reflectivity. 2.8
f start character; start cipher: start codeStart character
Several bars and spaces located at the beginning of a bar code symbol. 2.9
Terminator
Fstopcharacter;stopcipher:stopcodeA number of bars and spaces located at the end of the barcode symbol. 2.10
Blank area
clear area;quietzone;quietarea;clearzoneA limited area on the outside of the barcode symbol with the same reflectivity as the space. 1
GB/T12905—2019
Note: The blank area of ​​a one-dimensional barcode is located outside the start character and the end character, and the blank area of ​​a two-dimensional barcode is located on both sides or around the two-dimensional barcode symbol. 2.11
Barcode symbol
bar code symbol
An information symbol composed of a barcode and a blank area or a protective frame. 2.12
Character set
character set
A collection of letters, numbers and symbols that can be represented by a barcode symbol. 2.13
Separator
Separaton
A special character in a bar code that acts as a separator. 2.14
F bar code character
Bar code character
A combination of bars and spaces arranged in a certain pattern, used to represent a number, letter or symbol. 2.15
bar code character set
Bar code character set
A set of characters that can be represented by a certain bar code. 2.16
Bar code data character
bar code data character
A bar code character that represents specific information.
Bar code check character
F bar code check character
A bar code character that represents a check code.
element
The bars or spaces that make up a bar code character.
barheight
The height of the bar perpendicular to the unit width. 2.20
barwidth
The width of the bar in the barcode character.
spacewidth
The width of the space in the barcode character.
bar width ratio
Bar width ratio
The width ratio of the widest bar to the narrowest bar in the barcode. 2.23
Space width ratio
space width ratio
The width ratio of the widest space to the narrowest space in the barcode. 2
wide to narrow ratio
Width to narrow ratio
GB/T12905—2019
The sum of the bar width of the average wide bar and the space width of the average wide space (excluding the barcode character spacing) divided by twice the Z dimension. Technical parameters in the width adjustment encoding method.
N=（average width of bars + average width of spaces）/2Z Where:
N—width-to-narrow ratio;
Z dimension (see 6.4).
Barcode length
bar code length
The length from the leading edge of the barcode start character to the trailing edge of the barcode end character. 2.26
barcode symbol length; symbol lengthBarcode symbol length
The length of the area formed by the barcode length and the blank area, 2.27
Barcode density
barcode density
The number of barcode characters represented by a one-dimensional barcode per unit length or a two-dimensional barcode per unit area. 2.28
Barcode character interval
inter-character gap
The area between adjacent barcode characters that has no specific information and has the same reflectivity as the space. 2.29
module
The narrowest unit of a symbol character in a one-dimensional barcode and a layered two-dimensional barcode, or the smallest information-bearing unit in a matrix two-dimensional code. 2.30
Bearer bar
Border or box surrounding a barcode symbol with the same reflectivity as the bar. 2.31
Check code
A character used to verify the correctness of a code through a mathematical relationship. 2.32
Continuous bar code
continuous bar code
A bar code without bar code character spacing.
Discrete bar code
A bar code with bar code character spacing.
Bidirectional bar code
bi-directional bar code
A bar code with both ends of the bar code symbol as the starting point for scanning. 2.35
add-onbar code
Additional bar code
A bar code indicating additional information.
GB/T12905—2019
Parity check
odd-even check
A method of checking based on whether the number of 1 or 0 in a binary digit is odd or even. 2.37
Self-checking bar code
self-checking bar code
A bar code in which the bar code characters themselves have a check function. 2.38
Fixed length bar code
fixed length of bar code
A bar code in which the number of bar code characters is fixed.
Unfixed length of bar code
Unfixed length of bar code
A bar code in which the number of bar code characters is not fixed.
Width adjustment encoding
width encodebZxz.net
A bar code encoding method in which the bars and spaces in the bar code symbol are composed of two types of units, wide and narrow. 2.41
Module combination encoding
modulecombinationencode
A bar code encoding method in which the characters of the bar code symbol are composed of a specified number of modules. 2.42
odd permutation; odd parity module combination coding method, a bar code character contains an odd number of modules. 2.43
even permutation; even parity module combination coding method, a bar code character contains an even number of modules. 2.44
bar code logic
bar code logic value
expression of a bar code character using binary "0" and "1". 2.45
encoded volume
the maximum number of characters that can be represented in a bar code character set. 2.46
bar code character value
character value
intermediate value of the conversion of a one-dimensional bar code from a bar code logic to a character set. 2.47
central separating character
central separating character In some GS1 data carriers (such as EAN/UPC barcodes), a number of bars and spaces located in the middle of the barcode used to separate data segments. 2.48
amplification coefficient
amplification coefficient
Different sizes of barcodes based on nominal size and fixed ratio. Expressed as a percentage or decimal of the nominal size. 2.49
FNC1 character
function 1 symbol character
Function character used to indicate to barcode reading equipment the special operations or applications allowed. FNC1 is specially reserved for identifying the GS1 system and can also be used as a check character.
Linkage flag
linkage flag
GB/T12905—2019
In a databar barcode or GS1128 barcode that is a one-dimensional part, an indicator indicating whether the two-dimensional part is connected. Segment
The smallest decodable unit of a barcode symbol.
Note: In databar, a segment consists of a symbol character and its adjacent locator. 2.52
stacked2Dbarcode
Stacked2Dbarcode
A two-dimensional barcode formed by stacking multiple one-dimensional barcodes with their bar heights shortened. 2.53
2Dmatrixbar code
Matrix2Dbarcode
A two-dimensional barcode composed of modules of regular shapes arranged in a graphic matrix according to specific rules. 2.54
codewordcodeword
The value of a two-dimensional barcode character. The intermediate value of the conversion from a barcode logic to a character set. 2.55
error correction character
error correction character
The character for error detection and error correction in a two-dimensional barcode. 2.56
error correction codeword
error correction codeword
The value of an error correction character in a two-dimensional barcode.
Functional pattern
function pattern
A specific pattern used for symbol positioning and feature recognition in a matrix two-dimensional bar code symbol Note: Rewrite GB/T18284-2000 definition 3.7. 2.58
Positioning pattern
positioning pattern
A functional pattern used to determine symbol position and module coordinates in a matrix two-dimensional bar code symbol Note: Rewrite GB/T182842000. Definition 3.19. 2.59
Finding pattern
finder pattern
A functional pattern composed of position detection patterns in a matrix two-dimensional bar code symbol, used to determine the symbol position and direction 2.60
Position detection pattern
position detection pattern
One or more functional patterns of specific shapes that constitute the finding pattern in a matrix two-dimensional bar code symbol. Note: Rewrite GB/T18284-2000. Definition 3.132.61
Correction pattern
alignment pattern
Functional pattern used to determine the position of the module matrix in the matrix two-dimensional barcode symbol. Note: Rewrite GB/T18284-2000, definition 3.1. 2.62
Information encoding region
information encoding region
Area not occupied by functional patterns in the symbol·used to encode data or error correction codewords. 5
GB/T12905-2019
[GB/T21049-2007, definition 3.7]
Masking
Two-dimensional matrix array in digital image processing, used for extraction, masking and other functions in the image data processing process. Note: Rewrite GB/T18284-2000.Definition 3.9. 2.64
version
A series used to represent symbol specifications in a two-dimensional barcode. Note: Rewrite GB/T18284-2000.Definition 3.20. 2.65
Extended channel interpretation
Extended channel interpretation; ECI License agreement for different interpretations of the decoded output data stream and the default character set in a two-dimensional barcode 2.66
Remainder codeword
Remainder codeword
A filler codeword used to fill the empty codeword position when all data codewords and error correction codewords cannot fill the symbol capacity exactly. They follow the last error correction codeword. [GB/T18284-2000.Definition 3.15]
A method of representing a specific character set as a binary bit stream. Note: Rewritten from GB/T18284-2000, definition 3.10. 2.68
mode indicator
modeindicator
Identifier indicating the coding mode used for the following data sequence. 2.69
GS1 system
GS1system
An open standard system that serves global supply chain management and integrates automatic data collection such as barcodes and radio frequency, electronic data exchange, global product classification, global data synchronization, and electronic product codes (EPC), with the core of encoding trade items, logistics units, locations, assets, service relationships, and documents.
Barcode for commodity
bar code for commodity
A globally universal barcode symbol used to identify commodities, including the encoding and barcode representation of retail commodities, storage and transportation packaging commodities, logistics units, assets, service relationships, and locations of participants. 2.71
barcode in-store
The prefix code is 20 to 24. It is used to identify the goods processed by the store and sold in the store and the variable goods. 2.72
Prefix code
GS1prefix
The first 2 or 3 digits of the manufacturer identification code are uniformly allocated by GS1. 2.73
GS1companyprefix; the unique code assigned to the enterprise in the GCPGS1 system, consisting of 7 to 10 digits. Note: The manufacturer identification codes of enterprises in my country are allocated and managed by the National Article Coding Management Agency.
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