GB/T 12905-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12905-2019 | English | 500 |
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Bar code terminology
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| GB/T 12905-2000 | English | 839 |
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Bar coding terminology
| Obsolete |
| GB/T 12905-1991 | English | RFQ |
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Definition of common terminology used in bar code system--Terms for bar code symbol
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12905-2019
GB/T 12905-2019: Bar code terminology---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12905-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 35.040
A 24
Replacing GB/T 12905-2000
Bar code terminology
Issued on. MARCH 25, 2019
Implemented on. OCTOBER 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Basic terminology... 4
3 Symbology... 15
4 Bar code reading... 20
5 Production of bar code symbol... 25
6 Detection of bar code symbol... 26
Index... 38
1 Scope
This standard defines the terms and definitions of bar code basis, symbology,
bar code reading, bar code symbol production, bar code symbol detection.
This standard applies to research and application, which are related to bar code
technology.
2 Basic terminology
2.1
Bar code
A symbol, which is composed of a set of regularly arranged bars and spaces.
It can be read by the machine, to indicate certain information, including one-
dimensional bar code (2.2) and two-dimensional bar code (2.3).
2.2
Linear bar code; one-dimensional bar code
A bar code symbol, which represents information, in only one dimension.
2.3
Two-dimensional bar code; 2D code
Bar code symbols, which represent information, in both dimensions.
2.4
Symbology
Provisions regarding the bar code symbol's type, data representation
method, encoded volume, bar code character set and other characteristics.
2.5
Bar code system
A system, which is composed of design, production, scanning and reading
of bar code symbol.
2.6
Bar; dark bar; black bar
The part of the bar code symbol, which has a low reflectivity.
3 Symbology
3.1 One-dimensional bar code
3.1.1
EAN/UPC code
A continuous fixed-length one-dimensional bar code, which is managed and
maintained by the International Article Numbering Association (GS1), AND
can only represents the numeric characters, including EAN-13, EAN-8,
UPC-A, UPC-E bar codes.
Represented character set. Number. 0 ~ 9
3.1.2
EAN-13 bar code
The bar code symbol, which is used to represent GTIN-13.
3.1.3
EAN-8 bar code
The bar code symbol, which is used to represent GTIN-8.
3.1.4
UPC-A bar code
The bar code symbol, which is used to represent GTIN-12.
3.1.5
UPC-E bar code
The 8-bit coded bar code symbol, which is used to represent the GTIN-12
AND formed through zero removal compression.
4 Bar code reading
4.1
Decode
The process of determining the information, which is represented by the bar
code symbol.
4.2
Resolution of scanner
The indicator, that the instrument can distinguish the width of the narrowest
element (module), in the bar code symbol, expressed as a percentage.
4.3
First read rate
Under the same conditions, the ratio of the number of times that a bar code
symbol is successfully read, when it is scanned for the first time, TO the total
number of times that a bar code symbol is read.
4.4
Misread
The state, in which the output of the decoder is inconsistent with the data of
the bar code symbol.
4.5
Error rate
Under the same conditions, the ratio of the number of incorrectly read bar
code symbols TO the total number of read bar code symbols.
4.6
Non-read
The state, that the decoder does not produce the output, after scanning the
bar code symbol.
4.7
Non-readrate
Under the same conditions, the ratio of the number of unread bar code
symbols TO the total number of bar code symbols.
4.8
Bi-directional read
The bar code character characteristics, which can be read in both front and
back directions, using both ends of the bar code symbols as the start point
of scan.
4.31
Slot type scanner
A scanner, which can realize the reading function, by the carrier with bar
code symbols, through the card slot.
4.32
Omni-directional scanner
Raster scanner
Bar code scanner, which has omnidirectional reading performance.
4.33
Bar code hand-held terminal
A device, which combines the functions of a handheld scanner and a
handheld computer (handheld terminal) into one.
5 Production of bar code symbol
5.1 Bar width adjustment; BWA
In order to compensate for the increase or reduction of the bar width, in the
printing process, the reduction or increase of bar width, on the original bar
code film, as relative to the design bar width of the corresponding printed bar
code symbol.
[GB/T 26227-2010, definition 3.13]
5.2 Bar width reduction
The amount of reduction, when the bar width is adjusted.
[GB/T 26227-2010, definition 3.14]
5.3 Bar code printer
A device, which generates and prints bar code symbols.
5.4 Digital barcode image
Bar code digital film
Bar code electronic film
Bar code symbols, which are designed and stored in digital format.
5.5
Direct part marking; DPM
A marking technology, which uses dotting, laser etching, inkjet,
electrochemical etching, to mark parts and components. It can be used to
generate bar code symbols.
6 Detection of bar code symbol
6.1
Bar code verifier
A device, which is used to detect the quality of bar code symbols.
6.2
Nominal dimensions
The design size of the bar code symbol.
6.3
X dimension
The nominal size of the unit module, in the bar code symbol.
Note. In symbology systems, such as ITF-14 and interleaved 2 of 5 bar codes, it
refers to the nominal size of the narrow element, in the bar code symbol.
6.4
Z dimension
The average value of the actual size of the unit module, in the bar code
symbol.
Note. In code systems, such as ITF-14 and interleaved 2 of 5 bar codes, it refers to
the average value of the actual size of the narrow element, in the bar code symbol.
6.5
Void
The phenomenon of lack of ink, in the bar in the bar code symbol.
6.13
Average background reflectance
The average value of the background reflectance, which is expressed as a
percentage.
6.14
Average edge line
A theoretical edge, which is used to smoothen and determine the boundaries
of bars and spaces.
6.15
Edge fog
The phenomenon of unclear bar edges.
6.16
Edge-error
A deformation, where the edge of the bar does not meet the requirements of
the printing quality.
6.17
Bar edge conformance
The accuracy of the position of each part of the edge of the bar, based on
the corresponding average edge line.
6.51
Codewordread rate; CY
A measure of the ability of one-dimensional scanning to read data, from a
stacked two-dimensional bar code, that is, the percentage of the number of
codewords that can be effectively decoded TO the maximum number of
codewords, that shall be able to be decoded, after adjusting the reading
angle.
6.52
Unused error correction; UEC
The relative value of the error correction codeword and the error correction
volume, which is not used in the symbol decoding process.
6.53
Grade threshold
The boundary value, which distinguishes two levels of a parameter, which
itself is the lower limit of the previous level.
[GB/T 23704-2017, definition 3.5]
6.54
Binarized image
A black and white two-color image, which is obtained by processing a
reference gray-scale image, by the use of an overall threshold.
[GB/T 23704-2017, definition 3.9]
6.55
Module error
In the binarized image, the dark or light state of the module is inverted, as
relative to the design state.
[GB/T 23704-2017, definition 3.6]
6.56
Raw image
In the X and Y coordinates, the image, which is composed of the actual
reflectance value, corresponding to each pixel of the photosensitive array.
[GB/T 23704-2017, definition 3.7]
6.57
Reference grey-scale image
In the X and Y coordinates, the image, which is obtained through convolving
the original image, with a circular measuring aperture.
[GB/T 23704-2017, definition 3.8]
6.58
Sample area
A circular image area, which has a diameter of 0.8X. The value of X is the
average module width, which is calculated by the reference decoding
algorithm for the tested symbol. If the X size, which is permitted by the
specific application, is within a range of values, THEN, the X shall take the
minimum value, when calculating the diameter of the sampling spot.
[GB/T 23704-2017, definition 3.10]
6.59
Fixed pattern damage
Measure the effect of the contamination of the finder pattern, clear areas,
positioning patterns, guide patterns and other inherent patterns, on the
ability to detect and read symbols.
6.60
Axial nonuniformity
AN
Measure and grade the spacing between the center points of adjacent
modules, in each grid axis; measure the degree of unevenness of the
symbol's axial size.
Where.
AN - Axial inconsistency;
XAVG - The average spacing between the sampling points, along the X-axis
direction;
YAVG - The average spacing between the sampling points, along the Y-axis
direction.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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