Some standard content:
GB/T12905--2000
This standard refers to the British standard BSEN1556:1998 "Barcode Terminology", the international automatic identification manufacturers association (AIMI) and the American National Standards Institute (ANSI) related barcode standards and technical documents, and in combination with the current actual situation in my country, GB/T12905:1991 "Barcode System General Terminology Barcode Symbol Terminology" is revised. In the process of revising this standard, the technical content suitable for my country's situation in the original standard is retained, and the 17 items of the original standard are modified to varying degrees. The main contents of the revision of this standard are as follows: 1 The name of the standard is changed to "Barcode Terminology".
2 123 items are added.
3 The scope of the original standard is expanded and arranged according to the system. It is divided into six parts: basic part, barcode symbol type, barcode reading, barcode symbol production, barcode symbol detection, and barcode application system. Modify the "barcode" item in the original standard, and define barcode and its synonym barcode symbol as two terms. 4
5 The explanations of the items "barcode system" and "barcode character set" in the original standard have been revised. The explanations of the items "blank area", "middle separator", "barcode character", "barcode density" and "module" in the original standard have been improved. 6
The items "bar height", "bar width" and "space width" in the original standard have been redefined. 7
The concept of characteristic ratio has been introduced, and the item "length-to-height ratio" in the original standard has been revised to characteristic ratio. 8
The diagrams in the items related to barcode symbols in the original standard have been deleted, and the explanations of the items "UPC barcode", "EAN barcode", "25 barcode", "interlaced 25 barcode", "39 barcode" and "Codabar barcode" have been improved. 10 The printing error in the item "39 barcode" in the original standard has been corrected. 11Correct the "letters A to D in the character set represented" in the "Codabar barcode" entry in the original standard to "start/end characters: A, B, C, D\.
12Added Appendix A and Appendix B.
Appendix A and Appendix B of this standard are both reminder appendices. This standard replaces GB/T12905-1991 from the date of implementation. This standard is proposed and managed by the China Article Coding Center. The drafting unit of this standard: China Article Coding Center. The main drafters of this standard: Hu Jiazhang, Zhao Chen, Huang Yanbin This standard is the first revision.
1 Scope
National Standard of the People's Republic of China
Bar coding terminology
This standard specifies common bar code terms, definitions and interpretations. This standard applies to research and application fields related to bar code technology. 2 Basic part
2.1 Bar code bar code
GB/T 12905-- -2000
Replaces GB/T12905---1991
A mark consisting of a group of regularly arranged bars (2.6), spaces (2.7) and their corresponding characters, used to indicate certain information. 2.2 Barcode systembarcodesystem
A system consisting of the design, production, scanning and reading of barcode symbols (2.11). 3 Reflectance;reflectivity2.3
The ratio of the intensity of reflected light to the intensity of incident light. Diffuse reflection
The phenomenon that light projected on a rough surface is reflected in all directions. 2.5bzxz.net
Specular reflection
The phenomenon that light projected on a smooth surface is reflected in a single direction. 2.6 Bar;dark bar;black bar The part of the barcode (2.1) with a lower reflectivity (2.3). 2.7
Space;light bar
The part of the barcode (2.1) with a higher reflectivity (2.3). 2.8 start character;start cipher;start codeA number of bars (2.6) and spaces (2.7) located at the start position of the barcode (2.1). 2. 9 stop character;stop cipher;stop codeA number of bars (2.6) and spaces (2.7) located at the end position of the barcode (2.1). Clear area;quiet zone;quiet area;clear zone2.10
The barcode (2.1) start character (2.8) and stop character (2.9) with a reflectivity (2.3) equal to that of the spaces (2.7) on the outside. Barcode symbolbarcodesymbol
The barcode (2.1) including the blank area (2.10). 2.12 character setcharacter set
The set of letters, numbers and symbols that can be represented by a barcode symbol (2.11). 2.13 Central separating character A number of bars (2.6) and spaces (2.7) located in the middle of the barcode (2.1) used to separate data segments. separator
Separating character
Approved by the State Administration of Quality and Technical Supervision on June 9, 2000 and implemented on March 1, 2001
GB/T 12905---2000
A special character in the coded character set (2.12) that serves as a separator. 2.15 Barcode character barcode character A number of bars (2.6) and spaces (2.7) representing a character or symbol. 2.16 Barcode character set barcode.character set A set of barcode characters (2.15) that can be represented by a certain barcode (2.1). 2.17
Barcode data character barcode data character A barcode character (2.15) that represents specific information. 2.18 bar code check character bar code character (2.15) that represents a check code (6.1.16). 2.19 bar code filler character bar code character (2.15) that does not represent specific information. 2.20 element
the bar (2.6) or space (2.7) that constitutes a bar code character (2.15). 2.21 bar height
the height of a bar (2.6) perpendicular to the width of the element (2.20). bar width
the width of a bar (2.6) in a bar code character (2.15). 2.23
space width
the width of a space (2.7) in a bar code character (2.15). 2.24 Bar width ratio
Ratio of the width of the widest bar (2.6) to the narrowest bar (2.6) in the barcode (2.1). 5 Space width ratio
Ratio of the width of the widest space (2.7) to the narrowest space (2.7) in the barcode (2.1). 2.26 X dimension
Nominal size of the narrow cell (2.20) in the barcode symbol (2.11). 2.27 Z dimension
Actual size of the narrow cell (2.20) in the barcode symbol (2.11). 2.28 Wide to narrow ratioN
The sum of the bar width (2.22) of the average wide bar (2.6) and the space width (2.23) of the average wide space (2.7) (barcode character (2.15) spacing is not included) divided by twice the Z dimension (2.27). It is a technical parameter in the width adjustment coding method (2.44). Calculation formula: N = (bar width of average wide bar + space width of average wide space) / 2Z2.29 Barcode lengthbarcodelength
The length from the leading edge of the start character (2.8) of the barcode (2.1) to the trailing edge of the end character (2.9). 2.30 Barcode symbol lengthbarcodesymbol lengthsymbol lengthThe barcode length (2.29) including the blank area (2.10). Aspect ratio
The ratio of the barcode length (2.29) to the bar height (2.21). 2.32 Barcode density barcode density The number of barcode characters (2.15) represented by a barcode of unit length (2.1). Note: Usually expressed in CPI, that is, the number of barcode characters (2.15) that can be represented per inch. 118
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2.33 inter-character gap The area between adjacent barcode characters (2.15) that does not represent specific information and has the same reflectivity as space (6.1.5). 2.34 module module
The basic unit of the module combination coding method (2.45) that makes up the barcode character (2.15). 2.35 bearer bar
The border or frame that surrounds the barcode (2.1) and has the same reflectivity (2.3) as the bar (2.6). 2.36 continuous bar code continuous bar code The barcode (2.1) without inter-character gap (2.33). 2.37 discrete bar code The barcode (2.1) with inter-character gap (2.33). 2.38 bi-directional bar code The barcode symbol (2.11) can be scanned from both ends (2.1). 2.39Add-on barcode
Barcode indicating additional information (2.1).
2.40Odd-even check
A method of checking whether the number of 1s or 0s in a binary digit is odd or even. Self-checking barcode2.41
Barcode character (2.15) has a check function (2.1). 2.42Fixed-length barcodeBarcode with a fixed number of barcode characters (2.15) (2.1). 2.43Unfixed-length barcodeBarcode with a variable number of barcode characters (2.15) (2.1). Width encode
Barcode symbol (2.11) Bars (2.6) and spaces (2.7) are composed of two types of units (2.20): wide and narrow. Barcode (2.1) Encoding method. 2.45
Module combination encoding method module combination encoding method A method of encoding a barcode symbol (2.11) in which the character is composed of a specified number of modules (2.34). Binary code binary-edge-code
Two unit width barcode
Barcode character (2.15) composed of two width units (2.20). 2.47 Four-edge-code
Multiple unit width barcode
Barcode character (2.15) composed of three or more width units (2.20). 8 Odd permutation; odd parity 2.48
In the module combination encoding method (2.45), a permutation in which the sum of the number of modules (2.34) of the bars (2.6) contained in a barcode character (2.15) is an odd number.
J even permutation; even parity2.49 even permutation
In the module combination coding method (2.45), the sum of the number of modules (2.34) of the bars (2.6) contained in each bar code character (2.15) is an even number.
2.50 barcode logic value barcode logic value is the expression of the bar code character (2.15) using binary "0\ and \1". 2.51 encoded volume
The maximum number of characters that can be represented in the bar code character set (2.16). 2 bar code film master2.52
The master of the bar code (2.1) film.
GB/T12905---2000
2. 53 One-dimensional bar code linear bar code; one-dimensional bar code bar code symbol that only represents information in the 2-dimensional direction (2.11). 2.54 Two-dimensional bar code two-dimensional bar code bar code symbol that represents information in both 2-dimensional directions (2.11). Special bar code specialbarcode
Bar code made of special materials (2.11).
2.56 Bar code character value character value one-dimensional bar code (2.53) intermediate value converted from bar code logic formula (2.50) to character set (2.12), 2.57 codeword codeword
value of two-dimensional bar code (2.54) character. Intermediate value converted from bar code logic formula (2.50) to character set (2.12). 2.58 Error correction character Error correction character Character for error detection and error correction in a two-dimensional barcode (2.54). Error correction codeword Error correction codeword 2.59
Value of the error correction character (2.58) in a two-dimensional barcode (2.54). 3 Barcode symbol types
3.1 One-dimensional barcode
3.1.1 Circular barcode circular bar code; rotated bar A one-dimensional barcode (2.53) symbol composed of concentric circles. 3. 1.2 UPC barcode UPC code
A barcode (2.1) developed by the United States Uniform Code Council. It is a fixed-length, continuous, four-unit (2.20) width one-dimensional barcode (2.53). It includes two types: UPC-A code and UPC-E code. Character set represented (2.12): Numbers: 0~~93.7.3 EAN barcode EAN code
A barcode (2.1) developed by the International Article Numbering Association. It is a fixed-length, continuous, one-dimensional barcode (2.53) with four units (2.20) width. It includes two types: EAN-13 code and EAN-8 code. Character set represented (2.12): Numbers: 0~93.1.4 2 of 5 bar code A non-continuous one-dimensional barcode (2.53) with only bars (2.6) to represent information. The barcode characters (2.15) are composed of five regularly arranged bars (2.6), two of which are wide units (2.20) and the rest are narrow units (2.20). Character set represented (2.12): Numbers: 0~93.1.5 Interleaved 2 of 5 bar code A variant of the 2 of 5 barcode (3.1.4). It is a continuous one-dimensional barcode (2.53) in which both bars (2.6) and spaces (2.7) represent information. The barcode characters (2.15) on the adjacent odd and even positions are represented by five bars (2.6) and five spaces (2.7) interlaced. The character set (2.12) represented is: Numbers: 0~93.1.6 Matrix 2 of 5 bar code 2 of 5 matrix bar code A variant of 2 of 5 bar code (3.1.4). It is a variable-length, non-continuous barcode (2.1). It was proposed by the Dutch company Nief. The character set (2.12) represented by
is: Numbers: 0~93.1.7 3 of 9 bar code; Code 39 A non-continuous one-dimensional barcode (2.53) in which both bars (2.6) and spaces (2.7) represent information. The barcode character (2.15) is composed of five bars (2.6) and four spaces (2.7) arranged in a regular pattern, a total of nine units (2.20). Three of them are wide units (2.20), and the rest are narrow units 120
(2.20). The character set (2.12) represented by
is: Numbers: 0~9 GB/T 12905-2000
Letters: A~Z
Special characters: ten, one, $, ·, /, *, %, space 3.1.8 Code 93 bar code; Code 93 is a high-density one-dimensional bar code (2.53) compatible with the Code 93 and Code 9 bar codes (3.1.7). Each barcode character (2.15) is composed of nine modules (2.34), three bars (2.6) and three spaces (2.7). Character set represented (2.12): Numbers: 0~9 Letters: A~Z
Special characters: 一、●、$、％、Space、/、十 Control characters: .①、$
Start character (2.8)/Terminator (2.9): 3.1.9 Codabar bar code Codabar bar code Bars (2.6) and spaces (2.7) are both non-continuous one-dimensional bar codes (2.53) that represent information. The bar code character (2.15) consists of seven units (2.20) in a regular arrangement of four bars (2.6) and three spaces (2.7). Two or three of them are wide units (2.20), and the rest are narrow units (2.20). Character set represented by
(2.12): Numbers: 0~～9 Special characters: ten,, $,:,·,/ Start character (2.8)/End character (2.9): A, B, C, D 3. 1. 10 128 bar code 128 bar code; Code 128 is a non-fixed-length, continuous one-dimensional bar code (2.53). It uses four unit (2.20) widths, and each bar code character (2.15) consists of three bars (2.6) and three spaces (2.7), a total of eleven modules (2.34) to represent the character set (2.12): 128 bar code has three sets of character sets A, B, and C (2.12). The trade unit 128 bar code is a subset of the 128 bar code. 3. 1. 11 11 bar code; Code 11 is a non-fixed-length, non-continuous one-dimensional bar code (2.53). Each character consists of three bars (2.6) and two spaces (2.7). Among the three bars (2.6), there is one wide bar and two narrow bars. Among the two spaces (2.7), there is one wide space and one narrow space. Character set (2.12) represented: Numbers: 0 to 9 Special characters:
3.2 Two-dimensional bar code
3.2.1 Stacked two-dimensional bar code A two-dimensional bar code (2.54) composed of multiple truncated one-dimensional bar codes (2.53) stacked in layers. 3.2.1.1 Code 49
A continuous, variable-length stacked two-dimensional bar code (3.2.1) developed by Intermec in 1987. Each Code 49 symbol can be composed of two to eight layers, each of which consists of a left blank area (2.10), a start character (2.8), four data characters, a terminator (2.9) and a right blank area (2.10). Each layer has 18 bars (2.6) and 17 spaces (2.7). The layers are separated by a separator bar. Character set (2.12): Numbers: 0 to 9 letters; A to Z
Special characters: one, ·, %, %, $, ten, space Function characters: F1, F2, F3
Change characters: season, abundance*, ns
Total 49 characters.
3.2.1.2 16K barcode Code16K
GB/T12905--2000
-A continuous variable-length layered two-dimensional barcode (3.2.1). Each 16K barcode symbol (2.11) can be composed of 2 to 16 layers, each layer consists of a left blank area (2.10), a start character (2.8), a guard bar, 5 data characters, a terminator (2.9) and a right blank area (2.10). The layers are separated by a separator bar.
417barcode
A continuous variable-length layered two-dimensional barcode (3.2.1). Each PDF417 barcode symbol can be composed of 3 to 90 layers, each layer consists of a left blank area (2.10), a start character (2.8), a left indicator, 1 to 30 data characters, a right indicator, a terminator (2.9) and a right blank area (2.10). CODABLOCK F barcode Codablock F3.2.1.4
Developed in Germany, a layered two-dimensional barcode (3.2.1) based on 128 barcode (3.1.10)/39 barcode (3.1.7).
3.2.2 Matrix two-dimensional barcode 2Dmatrixbarcode A mark composed of polygonal units (2.20) with fixed center distance, used to represent a certain information (2.54). 3.2.2.1 CODF ONE barcode Code one is a matrix two-dimensional barcode (3.2.2) with ten versions and six code character sets (2.12) developed by Ted Williams of Intermec.
3. 2. 2.2 DATA MATRIX barcode Data matrix code is a matrix two-dimensional barcode (3.2.2) developed by the international DataMatrix company with two types of ECC000-140 and ECC-200.
3.2.2.3 MAXICODE barcode MaxiCode is a fixed-length matrix two-dimensional barcode (3.2.2) consisting of closely connected multiple rows of hexagonal modules (2.34) and a positioning pattern located in the center of the symbol.
3.2.2.4 VERICODE barcode VeriCode is a matrix two-dimensional barcode developed by Veritec (3.2.2). 3. 2.2.5 CP barcode CP bar code
A matrix two-dimensional barcode developed by CPTRON of Japan (3.2.2). 3.2.2.6 Calra code
A matrix two-dimensional barcode (3.2.2) developed by ALEC of Japan, whose unit shape is similar to the Chinese character "田" (3.2.2).
3.2.2.7 ULTRACODE barcode ultracode is a linear matrix two-dimensional barcode developed by Clive Hohberger (3.2.2). 3.2.2.8 QR code QR code
is a matrix two-dimensional barcode developed by Denso Corporation of Japan (3.2.2). 3.3 Special barcodes
3.3.1 Invisible barcode invisible barcode is a special barcode (2.55) that makes the barcode (2.1) invisible through special processing. 3.3.2 Metal barcode metalbarcode
is a special barcode (2.55) that uses metal materials as the carrier of the barcode symbol (2.11), or uses metal materials to form the barcode symbol (2.11). 3.3.3 Laser barcode laser barcode
is a special barcode (2.55) that combines the laser holographic image logo with the barcode (2.1) logo. 122
4 Barcode reading
4.1 Basics of barcode reading
4.1.1 Barcode reader Bar code reader Equipment for reading barcode symbols (2.11).
GB/T 12905---2000
4.1.2 Scanner
An optoelectronic device that converts the information of a barcode symbol (2.11) into an electrical signal that can be input to a decoder (4.1.4) by scanning. 4.1.3 Decoding
The process of determining the information represented by a barcode symbol (2.11). 4.1.4 Decoder
An electronic device that completes decoding (4.1.3). 4.1.5 Resolution of optoelectronic scanner Resolution of scanner An indicator of the width of the narrowest unit (2.20) in a barcode symbol (2.11) that the instrument can distinguish. An instrument that can distinguish 0.15~~0.30mm is considered high resolution, one that can distinguish 0.30~~0.45mm is considered medium resolution, and one that can distinguish more than 0.45mm is considered low resolution.
4.1.6 Misread
The state where the output of the decoder (4.1.4) and the data of the bar code symbol (2.11) are inconsistent. 4.1.7
First read rate
The percentage of successful first scans.
Non-read
The state where the decoder (4.1.4) does not generate an output after scanning the bar code symbol (2.11). 4.1.9 Bi-directional read The property of a bar code symbol (2.11) that can be read in both the forward and reverse directions. 4.1.10 Scanning distance The maximum distance at which a scanner (4.1.2) can read a bar code (2.1). Depth of field
The distance range at which a scanner (4.1.2) can read a barcode (2.1). Infrared light source infrared light
A light source with a wavelength in the infrared spectrum.
4.1.13 Visible light source visible light
A light source with a wavelength in the visible spectrum.
Dot size dot size
The diameter of the scanning spot.
Barcode reading equipment
Contact scanner
Contact scanner
A scanner that requires physical contact with the barcode symbol (2.11) to be read before it can be read (4.1.2). Non-contact scanner4. 2.2
A scanner that can read the barcode symbol (2.11) without physical contact during scanning (4.1.2). 4.2.3 Hand-held scannerA scanner that can read the barcode symbol (2.11) manually (4.1.2). Fixed mount scanner4.2.41
A scanner mounted in a fixed position (4.1.2). 123
GB/T 12905—2000
4.2.5 Fixed beam scannerfixed beam scannerA scanner with a relatively fixed scanning beam (4.1.2). 4.2.6
Moving beam scannermoving beam scannerA scanner that achieves automatic scanning by swinging or using a polygonal prism (4.1.2). 4.2.7 Laser scanner laserscanner
A scanner that uses laser as a light source (4.1.2). 4.2.8
CCD scanner charge coupled device scanner; CCD scanner uses a charge coupled device (CCD) electronic automatic scanning photoelectric converter. 4.2.9 Light pen light pen
A pen-shaped contact fixed beam scanner (4.2.5). 4.2.10 Omni-directional scanner bar code (2.1) scanner (4.1.2) with omnidirectional reading performance. Bar code hand-held terminal 4.2.11
A device unit that combines the functions of a handheld scanner (4.2.3) and a handheld computer (handheld terminal). High-speed scanner high-speed bar code scanner 4.2.12
A scanner with a scanning rate of 600 times/min (4.1.2). 5 Barcode symbol production
5.1 Basics of barcode symbol production
5.1.1 On-site print A method of generating barcode symbols (2.11) in real time. 5.1.2 Off-site print A method of generating barcode symbols (2.11) in advance. 5.1.3 Bar width reduction barwidth reduction BWR
The correction amount to the nominal size in the production of barcode master film (2.52) to correct the systematic error of the printing process. 5.2 Barcode production equipment
5.2.1 Barcode printer bar code printer Equipment that generates barcode symbols (2.11) in real time. 5.2.2 Equipment for barcode film master Equipment that generates barcode master film (2.52). 6 Barcode symbol detection
6.1 Basics of barcode symbol detection
6.1.1 Nominal dimensions The design dimensions of a barcode symbol (2.11).
2 Void
The phenomenon of lack of ink in a bar (2.6) of a barcode symbol (2.11). Spot
The stain in the hollow (2.7) or blank area (2.10) of a barcode symbol (2.11). Bar reflectance; dark reflectance6.1.4
The minimum value of the reflectance (2.3) measured in a bar (2.6) of a barcode symbol (2.11). 12.1
GB/T12905---2000
6. 1. 5 Space reflectance; light reflectance R
The maximum value of the reflectance (2.3) measured in a space (2.7) or blank area (2.10) in a bar code symbol (2.11). Print contrast signal6. 1. 6
The percentage of the difference between the space reflectance (6.1.5) and the light reflectance (6.1.4) in a bar code symbol (2.11) and the space reflectance (6.1.5). Calculation formula: PCS［(R一R)/R.X100% average background reflectance average background reflectance 61.7
The average value of the background reflectance (2.3) expressed in percentage 6.1.8 Average edge line average edge line A theoretical edge line used to smooth and determine the boundary of the bar (2.6) (space (2.7)) 6.1.9 Edge fog edge fog
The phenomenon that the edge of the bar (2.6) is not clear.
6.1.10 Edge deformation edge-error
The deformation phenomenon that the edge of the bar (2.6) does not meet the printing quality requirements. Similar edge width edge-to-similar-edge 6. 1. 11
The width of the distance between the same-side edges of two adjacent bars (2.6) or spaces (2.7) in a bar code symbol (2.11). scan reflectance profile6. 1. 12
The reflectance (2.3) curve measured by the scanner (4.1.2) scanning the bar code symbol (2.11). 6.1.13 element edge
The scanning trajectory position corresponding to the midpoint of the reflectance (2.3) of the space (2.7) and bar (2.6) (bar, space) of the adjacent cells (2.20) on the scan reflectance curve (6.1.12).
6. 1. 74 error correcting protocolerror correcting mode (6.1.15)The rules for the operation of the error correction mode. 6. 1. 15
Error correction modeerror correcting modeThe method of automatically correcting errors that occur in data transmission. 6. 1.16 error correcting codeFCC
A specific additional code for verifying data during data transmission. Error rate error rate
The percentage of decoded erroneous data to the total amount of information. Printability, printability
The overall performance of a symbol carrier and other printing materials matched to printing conditions to be suitable for a printing operation. 6.1.19
Printability gauge printability gauge A set of specific calibration symbols printed on a carrier, used to test the quality of printing. Printability test printability test 6.1.20
A test performed to determine printability (6.1.18). 6.1.21 Decodability
A measure of the printing accuracy of a bar code (2.1) that can be read by a bar code reader (4.1.1). A specific symbol decoding (4.1.3) algorithm is used when decoding (4.1.3) a bar code (2.1).
6.1.22 Symbol contrast
symbol contrast
The difference between the maximum reflectivity (Rmax) (6.1.30) and the minimum reflectivity (Rmmn) (6.1.29) on the scanned reflectivity curve (6.1.12): 125
Calculation formula: SC=RmaxRmin
GB/T12905--2000
6.1.23 Element reflectance nonuniformity ERN
The difference between the highest peak and the lowest valley of the reflectivity (2.3) in each element (2.20) and blank area (2.10). When the element (2.20) is composed of a single peak or valley, its element reflectance nonuniformity (6.1.23) is zero. 6.1.24 Maximum element reflectance nonuniformity ERNmax
The maximum value of the element reflectance nonuniformity (6.1.23) in the scanned reflectance curve (6.1.12) 6.1.25 Global threshold GT
The midpoint between the maximum reflectance (6.1.30) and the minimum reflectance (6.1.29) on the scanned reflectance curve (6.1.12), used to determine the strip (2.6) and the boundary of the empty space (2.7).
Calculation formula: GTRmin + SC/2
6.1.26 Inspection band
The area defined by 10% to 90% of the bar height (2.21) of the bar code symbol (2.11). 6.1.27 Edge contrast
The difference between the empty reflectivity (6.1.5) and the reflectivity (2.3) of the adjacent bar (2.6). 6.1.28 Minimum edge contrastECmin
The minimum value of the edge contrast (6.1.27) on the scanned reflectivity curve (6.1.12). 6.1.29
9 Minimum reflectivityminimumreflectanceRrnin
The minimum value of the reflectivity (2.3) on the scanned reflectivity curve (6.1.12). 6.1.30 Maximum reflectance Rmux
The maximum value of the reflectance (2.3) on the scanned reflectance curve (6.1.12). 6.1.31
Modulation ratio modulation
The percentage of the minimum edge contrast (ECmin) (6.1.28) and the symbol contrast (SC) (6.1.22). Calculation formula: MOD = (ECmin/SC) X100% 6.1.32
Overall profile grade The lowest grade among the unit boundary (6.1.13) measurement, scanned reflectance (2.3), decoding (4.1.3), and decodability parameters. 6.1.33 Substrate substrate
The material (paper, plastic, metal, etc.) on which the barcode symbol (2.11) is printed or reproduced. Over laminate
Coating or material adhered to the surface of a bar code symbol (2.11) 6.1.35 Symbol grade
The arithmetic mean of the comprehensive characteristic grade (6.1.32) of a specified number of times within the detection band of a bar code symbol (2.11) at a certain measurement aperture and nominal wavelength.
6.1.36 Infinite pad method A method of measuring the reflectivity (2.3) of a bar code (2.1) substrate (6.1.33) using a sufficiently thick bar code (2.1) substrate (6.1.33) as the substrate of the bar code symbol (2.11) to be measured.
6.1.37 Showthrough
GB/T 12905—2000
The undesirable property of the reflectivity (2.3) of the substrate (6.1.33) due to the pattern or material underneath the substrate (6.1.33). 6.2 Barcode symbol detection equipment
6.2.1 Barcode verifier barcode verifier device used to detect the dimensional error and optical characteristics of the barcode symbol (2.11) portable barcode verifier portable bar code verifier 6.2.2
easy to carry, battery-powered barcode verifier (6.2.1). 7 Barcode application system
Automatic sales system
point of sale
Information management system that uses automatic recognition technology such as barcodes (2.1) to manage individual items in the retail industry in real time. 7.2 Product management system
point of production
An information management system that uses automatic identification technologies such as barcodes (2.1) to manage product production information in real time. 7.3 Commodity circulation management system pointof transferPOT
An information management system that uses automatic identification technologies such as barcodes (2.1) to manage commodity circulation in real time. 7.4
Service management system
point of service
An information management system that uses automatic identification technologies such as barcodes (2.1) to manage the service industry in real time. 127
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