CN119374445A - Commodity barcode comparison device and comparison method - Google Patents
Commodity barcode comparison device and comparison method Download PDFInfo
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- CN119374445A CN119374445A CN202411950549.7A CN202411950549A CN119374445A CN 119374445 A CN119374445 A CN 119374445A CN 202411950549 A CN202411950549 A CN 202411950549A CN 119374445 A CN119374445 A CN 119374445A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
- G06K7/1413—1D bar codes
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
- G06K7/1452—Methods for optical code recognition including a method step for retrieval of the optical code detecting bar code edges
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
- G06K7/1486—Setting the threshold-width for bar codes to be decoded
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses a commodity bar code comparator and a comparison method, and belongs to the technical field of bar code quality detection. The comparator comprises a comparison plate body, wherein an X axis is arranged on the surface of the comparison plate body, a left blank measuring area and a right blank measuring area are respectively arranged on two sides of the X axis, Y axes which are perpendicular to and intersected with the X axis are respectively arranged on the left blank measuring area and the right blank measuring area, a module measuring part and a blank measuring part are respectively arranged on two sides of the Y axis, multiplying power reference lines corresponding to the original points are respectively arranged on the two module measuring parts, the slope of each multiplying power reference line is the ratio of the corresponding blank area width to the total width of a bar code module, a plurality of mapping reference lines parallel to the X axis are connected between each multiplying power reference line and the Y axis, a plurality of equal scale reference lines inclined by 45 degrees are respectively arranged on the two blank measuring parts, and the plurality of mapping reference lines are connected with the plurality of equal scale reference lines in the corresponding Y axis. The invention can improve the efficiency of detecting the width of the bar code module and the blank area.
Description
Technical Field
The invention relates to the technical field of commodity bar code quality detection, in particular to a commodity bar code comparator and a commodity bar code comparison method.
Background
The bar code or bar code is formed from a group of bar, blank and its correspondent code which are regularly arranged, and is used for expressing information for identifying retail commodity, storage and transportation package commodity, logistics unit and participant position, etc.. Wherein the retail commodity code is a unique code identifying the identity of the commodity in the retail industry, with global uniqueness. The retail commodity code is formulated by the international association of item codes, the bar code representation of which employs the EAN/UPC bar code system defined in ISO/IEC 15420. The EAN/UPC bar code has four structures of EAN-13, EAN-8 and UPC-A, UPC-E. The EAN/UPC bar code is characterized by that several black bars (short bars) and white bars (short spaces) with identical width and large difference in reflectivity are arranged into parallel line pattern according to a certain coding rule, and a graphic identifier for expressing a group of information can be used for identifying various information of production country, manufacturer, commodity name and specification model of article. The method has the advantages of high information acquisition speed, high reliability, large information quantity, large degree of freedom, convenient manufacture, flexible use and the like, and is widely applied to the commodity circulation field.
The EAN/UPC bar code is generally printed on commodity package for supermarket, market and other places to use in a code scanning identification mode, so that the quality of the printed bar code plays a vital role in identification speed and accuracy.
In order to enable the bar code to be effectively identified, relevant standards make clear regulations on indexes such as the decoding degree, optical characteristics, blank area width, symbol level, Z dimension (single module width) and the like of the bar code, wherein the blank area size and the module width of the bar code are mandatory items for detecting the quality of the bar code, the accuracy rate of bar code identification is directly influenced, and the most common non-conforming items causing unqualified bar code quality are also generated.
At present, a plurality of members of a bar code system exist, but the existing bar code measuring ruler can only be used for detecting the amplification factor of a bar code, and no tool capable of rapidly judging whether the blank area and the module width of the bar code meet the requirements exists. Enterprises generally need to send bar code samples to branches of national article coding centers for detection and judgment. The conventional detection and judgment mode is complex, and generally, the length measuring tool is used for measuring the width of the blank area, the bar code detector is used for measuring the Z value, judging whether the Z value is qualified or not, and the calculation and comparison are used for judging whether the blank area meets the standard requirement or not, so that the detection efficiency is low. In addition, the width of the bar code blank area is related to the Z size, but the bar code pattern is small, a single module of the initiator and the terminator is thin, the Z size cannot be accurately measured by means of a conventional length measuring tool, an enterprise needs to add extra expense if being provided with a bar code detecting instrument, the Z size cannot be easily measured due to lack of the device, and therefore self-inspection and daily management and control of the printing quality of the bar code blank area cannot be performed. Therefore, a tool capable of conveniently and rapidly measuring the size of the blank space of the bar code and whether the width of the module meets the specification is needed.
Disclosure of Invention
The invention aims to provide a commodity bar code comparator and a comparison method, which can conveniently and rapidly compare and detect the width of a bar code blank area and a module, improve the detection efficiency of the bar code blank area and the module, and reduce the cost of daily control of the printing quality of the bar code blank area of an enterprise. The technical scheme adopted by the invention is as follows.
In one aspect, the invention provides a commodity bar code comparator, which comprises a transparent comparison plate body, wherein the surface of the comparison plate body is provided with an X axis, and the two sides of the X axis are respectively provided with a left empty measuring area and a right empty measuring area;
The left empty measuring area and the right empty measuring area are respectively provided with a Y axis which is perpendicular to the X axis and is intersected with the X axis, and the left empty measuring area and the right empty measuring area are respectively divided into a module measuring part and a blank area measuring part by the corresponding Y axes;
The method comprises the steps that an intersection point of a Y axis and an X axis is taken as an origin, two module measuring parts are provided with multiplying power reference lines corresponding to the origin, wherein the slope of the multiplying power reference line of a left blank measuring area is a ratio of a preset bar code left blank area width to a bar code module total width, and the slope of the multiplying power reference line of a right blank measuring area is a ratio of a preset bar code right blank area width to the bar code module total width;
The two blank area measuring parts are respectively provided with a plurality of equal scale reference lines, two ends of each equal scale reference line are respectively connected with an X axis and a Y axis, and the included angles of each equal scale reference line and the X axis and the Y axis are 45 degrees;
In the left and right empty measuring areas, there are several mapping reference lines and several equal scale reference lines connected to corresponding Y-axis.
According to the technical scheme, according to the standard specification of the identifiable bar code, the minimum value of the width of the bar code blank area and the total width of the module are specified multiples of the Z value of the bar code, so that the comparator is designed according to the relationship between the width of the bar code blank area and the total width of the module and the Z value of the bar code, the actual value of the total width of the bar code module and the theoretical minimum value of the width of the blank area are related through the multiplying power reference line and the equal scale mark, when the comparator is used, the bar code module area is only required to be aligned with the module measuring part, the point corresponding to the width of the module is found out on the multiplying power reference line, and then the Y-axis coordinate of the point is mapped to the blank area measuring part through the mapping reference line and the equal scale mark, so that whether the width of the blank area meets the minimum value requirement of the width of the blank area corresponding to the total width of the module can be rapidly judged, and the comparison and detection are convenient and rapid.
It should be noted that, considering that the comparator of the present invention is placed according to the direction of the bar code, the X axis and the Y axis are not limited to the horizontal X coordinate axis and the vertical Y coordinate axis in the planar coordinate system.
Optionally, the positions of the inner module measuring part and the blank measuring part in the left blank measuring area and the right blank measuring area are met, when the bar code is projected in the left blank measuring area, the blank measuring part in the left blank measuring area is projected by the left blank area of the bar code when the outer edge of the bar code initiator is coincident with the Y axis of the left blank measuring area, and when the bar code is projected in the right blank measuring area, the blank measuring part in the right blank area is projected by the blank measuring part in the left blank measuring area when the outer edge of the bar code terminator is coincident with the Y axis of the right blank measuring area. Under this concept, the Y axis on the alignment plate body may be provided as one or two, that is:
as an embodiment, the Y axes of the left empty measurement area and the right empty measurement area are on the same straight line, the empty measurement area of the left empty measurement area is adjacent to the module measurement area of the right empty measurement area, and the module measurement area of the left empty measurement area is adjacent to the empty measurement area of the right empty measurement area. However, in this embodiment, since the length of the module measuring part is adapted to the total length of the bar code, and the module measuring parts of the left and right empty measuring areas are extended away from each other, the whole comparison board body needs a relatively long length, which is inconvenient to carry and place;
thus, as a further embodiment, the left and right measuring areas are provided with mutually offset Y-axes, the empty measuring sections of the left and right measuring areas being remote from each other, the modular measuring sections of the left and right measuring areas being at least partially adjacent. Under this kind of embodiment, the whole length in left side empty measurement area and the empty measurement area in right side all adapts to and compares the board body's overall length and design, can make comparator area and length reduce, conveniently carry, place and use.
As the bar code Z values under different amplification factors, namely the single module width and the amplification factor range of the bar code are specified in the bar code standard, the possible breadth size range of the actual bar code is considered, and the following technical scheme not only can reduce the size of the comparator as much as possible, but also can detect whether the width of the bar code module is qualified or not:
the X-axis coordinate value of the end point of the multiplying power reference line far away from the origin is at least equal to the total width upper limit value of the bar code module corresponding to the set maximum amplification factor;
The module measuring part of at least the left blank measuring area or the right blank measuring area is provided with an amplification factor reference line parallel to the Y axis, wherein the amplification factor reference line comprises a maximum factor reference line and a minimum factor reference line, the X-axis coordinate value of a point where the maximum factor reference line and the magnification reference line intersect is equal to the set maximum amplification factor corresponding bar code module total width upper limit value, and the X-axis coordinate value of a point where the minimum factor reference line and the magnification reference line intersect is equal to the set minimum amplification factor corresponding bar code module total width lower limit value.
During contrast detection, the bar code is projected on the module measuring part, one side edge is aligned with the Y axis, if the other side edge exceeds the range defined between the two amplification factor reference lines, the total width of the bar code module is not qualified, and the detection of the blank area width is not needed. Because the detection of the total width of the bar code only needs to be detected once, the amplification factor reference line can be only arranged in the left-hand measuring area or the right-hand measuring area, and can be also arranged in both the left-hand measuring area and the right-hand measuring area.
In some possible embodiments, the points of intersection of the two reference lines at the extreme edge and the multiplying power reference line in the plurality of mapping reference lines are respectively the points of intersection of the minimum coefficient reference line and the maximum coefficient reference line and the multiplying power reference line.
Optionally, the plurality of equal scale reference lines are equidistantly arranged, the plurality of mapping reference lines are equidistantly arranged, and each mapping reference line is respectively connected with one equal scale reference line on the Y axis. Under the implementation mode, a user can judge the position of the minimum value of the blank area width corresponding to the bar code to be tested on the X axis through naked eyes more conveniently.
Optionally, the alignment plate body is square, can adopt glass substrate or film to make, and on the alignment plate body that adopts glass substrate to make, the lines can adopt other colours of non-black to the preferred different types of lines adopt different colours, more be convenient for distinguish and detect. The film is adopted to the comparison plate body, so that the manufacturing cost can be greatly reduced, and the rapid popularization of products is facilitated.
In a second aspect, the present invention provides an alignment method based on the commodity barcode comparator of the first aspect, including:
a) When the left empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the left blank measurement area to coincide with the outer side edge line of the first module of the bar code initiator, projecting the bar code on the module measurement part of the left blank measurement area, and projecting the bar code left blank area on the blank area measurement part of the left blank measurement area;
Acquiring an actual intersection point of an outer edge line of a last module of the bar code terminator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis by connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a left blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether a boundary line of the left blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the left blank area of the bar code is qualified;
B) When the right empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the right empty measuring area to coincide with the outer side edge line of the last module of the bar code terminator, projecting the bar code on the module measuring part of the right empty measuring area, and projecting the bar code right empty area on the empty area measuring part of the right empty measuring area;
Acquiring an actual intersection point of an edge line at the outer side of a first module of a bar code initiator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis through connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a right blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether the boundary line of the right blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the right blank area of the bar code is qualified.
The inner side and the outer side of the first module of the initiator and the last module of the terminator are distinguished according to whether the first module faces the other modules of the bar code or the blank area, the side close to the other modules of the bar code is the inner side, and the side facing the blank area is the outer side.
In a third aspect, the present invention provides another comparison method based on the commodity barcode comparator of the first aspect, where on the comparison plate body of the commodity barcode comparator, at least a module measurement portion of a left space measurement area or a right space measurement area is provided with an amplification factor reference line parallel to a Y axis, where the amplification factor reference line includes a maximum factor reference line and a minimum factor reference line, where an X-axis coordinate value of a point where the maximum factor reference line intersects with the magnification factor reference line is equal to a set maximum amplification factor corresponding barcode module total width upper limit value, and an X-axis coordinate value of a point where the minimum factor reference line intersects with the magnification factor reference line is equal to a set minimum amplification factor corresponding barcode module total width lower limit value;
The comparison method comprises the following steps:
S1, performing module width comparison by using a left blank measurement area or a right blank measurement area provided with an amplification factor reference line, wherein the module width comparison comprises the steps of covering a comparison plate body on the surface of a bar code to be detected, enabling the bar code to be projected on a module measurement part, enabling one side edge line of the bar code module to coincide with a Y axis, judging whether the other side edge line of the bar code module is positioned between a maximum factor reference line and a minimum factor reference line, if the maximum factor reference line and the minimum factor reference line are met, judging that the width of the bar code module is qualified, and if the maximum factor reference line and the minimum factor reference line are not met, judging that the width of the bar code module is not qualified, and stopping comparison detection;
s2, detecting the width of a bar code blank area, comprising the following steps:
a) When the left empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the left blank measurement area to coincide with the outer side edge line of the first module of the bar code initiator, projecting the bar code on the module measurement part of the left blank measurement area, and projecting the bar code left blank area on the blank area measurement part of the left blank measurement area;
Acquiring an actual intersection point of an outer edge line of a last module of the bar code terminator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis by connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a left blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether a boundary line of the left blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the left blank area of the bar code is qualified;
B) When the right empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the right empty measuring area to coincide with the outer side edge line of the last module of the bar code terminator, projecting the bar code on the module measuring part of the right empty measuring area, and projecting the bar code right empty area on the empty area measuring part of the right empty measuring area;
Acquiring an actual intersection point of an edge line at the outer side of a first module of a bar code initiator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis through connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a right blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether the boundary line of the right blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the right blank area of the bar code is qualified.
It should be noted that the density of the mapping reference lines and the equal scale lines in the invention should be as dense as possible while meeting the requirements of clear resolution, so that the invention is suitable for comparing and detecting barcodes with different amplification coefficients. When the outside edge line of the bar code initiator or terminator and the multiplying power reference line are not crossed, the nearest mapping reference line is selected so as to obtain the connection point of the corresponding equal scale line and the X axis, the upper and lower position relation between the selected mapping reference line and the actual crossing point is considered, and the corresponding reference position point used for defining the minimum width boundary of the bar code blank area is moved leftwards and rightwards by the connection point of the selected equal scale line and the X axis.
Advantageous effects
According to the commodity bar code comparator, the left blank measuring area and the right blank measuring area which are respectively provided with the module measuring part and the blank measuring part are arranged, the multiplying power reference line and the mapping reference line are arranged on the module measuring part, and the equal scale reference line is arranged on the blank measuring part, so that a user can compare and detect the actual widths of the left blank area and the right blank area according to the total width of a bar code module. The comparison process does not need a bar code detector, and the detection efficiency and the detection accuracy are high.
Meanwhile, the amplification factor reference line is arranged in the module measuring part, so that a user can conveniently and rapidly judge whether the total width of the bar code module is qualified or not, and if the total width of the bar code module is not qualified, the blank area width detection is not needed, namely, the comprehensive detection and comparison of the total width of the bar code module and the blank area width can be realized.
Drawings
FIG. 1 is a schematic diagram of the product of example 2 of the bar code comparator of the present invention;
FIG. 2 is a schematic diagram of the product of example 3 of the bar code comparator of the present invention;
FIG. 3 is a schematic diagram of the product of example 4 of the bar code comparator of the present invention;
FIG. 4 is a schematic diagram showing the structure of EAN-13 code;
FIG. 5 is a schematic diagram of EAN-13 code;
FIG. 6 is a diagram of the left empty measurement zone of the comparator for EAN-13 codes according to the present invention;
FIG. 7 is a schematic diagram of the comparison method of the present invention when EAN-13 code left space detection is performed by using the left space measurement area of the comparator;
FIG. 8 is a schematic diagram of the comparison method of the present invention when EAN-13 code right empty detection is performed by using the right empty measurement area of the comparator;
In FIGS. 1-8, 1-alignment plate body, 2-magnification reference line, 3-mapping reference line, 4-equal scale reference line, 5-EAN-13 code, 51-initiator, 52-left data symbol, 53-middle separator, 54-right data symbol, 55-verifier, 56-terminator, 57-left blank, 58-right blank, 59-preamble.
Detailed Description
According to the technical concept of the invention, according to the association relation between the width of the blank space of the bar code and the total width of the bar code module and the Z value of the bar code, by setting a comparison plate and reasonably setting a multiplying power reference line, a mapping reference line and an equal scale reference line on the comparison plate, the Y-axis coordinates of each point on the multiplying power reference line can be mapped to the X-axis of the blank space measuring part, so that the minimum width boundary of the blank space of the bar code in the blank space measuring part can be determined according to the intersection point of the outer edge line of the module in the module measuring part and the multiplying power reference line, and the rapid and efficient detection of the width of the blank space of the bar code is realized.
Further description is provided below in connection with the drawings and the specific embodiments.
Example 1
The embodiment introduces a commodity bar code comparator, referring to fig. 1 to 3, which comprises a transparent comparison plate body 1, wherein the surface of the comparison plate body 1 is provided with an X axis, and the two sides of the X axis are respectively provided with a left empty measuring area and a right empty measuring area;
The left empty measuring area and the right empty measuring area are respectively provided with a Y axis which is perpendicular to the X axis and is intersected with the X axis, and the left empty measuring area and the right empty measuring area are respectively divided into a module measuring part and a blank area measuring part by the corresponding Y axes;
The method comprises the steps that an intersection point of a Y axis and an X axis is taken as an origin, a multiplying power reference line 2 corresponding to the origin is arranged on each of two module measuring parts, wherein the slope of the multiplying power reference line 2 of a left blank measuring area is the ratio of the width of a preset bar code left blank area to the total width of a bar code module, and the slope of the multiplying power reference line of a right blank measuring area is the ratio of the width of a preset bar code right blank area to the total width of the bar code module;
The two blank area measuring parts are respectively provided with a plurality of equal scale reference lines 4, two ends of each equal scale reference line 4 are respectively connected with an X axis and a Y axis, and the included angles between each equal scale reference line 4 and the X axis and the Y axis are 45 degrees;
In the left and right empty measuring areas, there are several mapping reference lines 3 and several equal scale reference lines 4 connected to the corresponding Y-axis.
In the embodiment, the positions of the inner module measuring part and the blank measuring part in the left blank measuring area and the right blank measuring area are met, when the bar code is projected to the left blank measuring area, the blank measuring part in the left blank measuring area is projected to the bar code left blank when the outer edge of the bar code initiator is coincident with the Y axis of the left blank measuring area, and when the bar code is projected to the right blank measuring area, the blank measuring part in the left blank measuring area is projected to the bar code right blank when the outer edge of the bar code terminator is coincident with the Y axis of the right blank measuring area. Under this concept, the Y axis on the alignment plate body may be provided as one or two,
Because the minimum value of the width of the bar code blank area and the total width of the module are specified multiples of the Z value of the bar code, in the embodiment, the comparator is designed according to the relationship between the width of the bar code blank area and the total width of the module and the Z value of the bar code, and the actual value of the total width of the bar code module is related to the theoretical minimum value of the width of the blank area through a multiplying power reference line and an equal scale mark and is reflected in a blank area measuring part. When the system is used, only the bar code module area is aligned with the module measuring part, a point corresponding to the module width is found out on the multiplying power reference line, and then the Y-axis coordinate of the point is mapped to the blank area measuring part through the mapping reference line and the equal scale mark, so that whether the blank area width meets the minimum value requirement of the blank area width corresponding to the total module width can be rapidly judged.
It should be noted that, the densities of the mapping reference lines and the equal scale lines are preferably as dense as possible while meeting the requirements of clear resolution, so that the method can be suitable for comparing and detecting the bar codes with different amplification factors.
In fewer application scenes, when no mapping reference line exists at the intersection point of the outer edge line of the bar code initiator or terminator and the multiplying power reference line, after the closest mapping reference line is selected so as to obtain the connection point of the corresponding equal scale line and the X axis, the upper and lower position relation between the selected mapping reference line and the actual intersection point should be considered, and the corresponding reference position point used for defining the minimum width boundary of the bar code blank area is moved leftwards or rightwards at the connection point of the selected equal scale line and the X axis, for example, when the comparison test is carried out on the left blank area, if the selected mapping reference line is above the actual intersection point, the absolute value of the X axis coordinate of the connection point of the equal scale line connected with the mapping reference line and the X axis is actually larger than the absolute value of the X axis coordinate of the minimum width boundary of the bar code blank area. Thus, the reference location point for defining the minimum width boundary of the barcode blank should be moved rightward from the selected connection point of the isocratic line with the X-axis. The distance moved can be calculated from the vertical distance between the selected mapped reference line and the actual intersection point, or other linear objects can be used as auxiliary isocratic lines to determine the actual reference position point.
As shown in fig. 1 to 3, the alignment plate body may be square or other shapes, and may be made of a glass substrate or a film, and on the alignment plate body made of a glass substrate, the lines may be made of other colors than black, and preferably different types of lines are made of different colors, so that the resolution and detection are facilitated. The film is adopted to the comparison plate body, so that the manufacturing cost can be greatly reduced, and the rapid popularization of products is facilitated.
Example 2
Based on embodiment 1, considering that the whole lengths of the left and right empty measuring areas are adapted to the whole length of the comparison plate body, the length of the comparison plate body should not be excessively large or excessively long as a tool capable of conveniently performing bar code comparison detection.
In this embodiment, as shown in fig. 1, the left empty measuring area and the right empty measuring area are provided with Y axes which are staggered, the empty measuring areas of the left empty measuring area and the right empty measuring area are far away from each other, and at least partial sections of the module measuring areas of the left empty measuring area and the right empty measuring area are adjacent.
Meanwhile, in order to facilitate the user to judge the position of the minimum value of the blank area width corresponding to the bar code to be tested on the X axis by naked eyes, in the embodiment, a plurality of equal-scale reference lines 4 are equidistantly arranged, a plurality of mapping reference lines 3 are equidistantly arranged, and each mapping reference line is respectively connected with one equal-scale reference line on the Y axis.
The design and description of the comparator is presented below for a common EAN-13 barcode.
Referring to fig. 4 and 5, fig. 5 shows the composition of the EAN-13 barcode, and it should be noted that, since the barcode is only schematic, the module part is subjected to the stripe portion spotting treatment and the stripe space cutting treatment for the purpose of non-scannable, and similarly, in fig. 7 and 8, the barcode is subjected to the spotting treatment so as to be non-identifiable by scanning.
From fig. 4 and 5, the ean-13 barcode includes, from left to right, a left blank section 57, a start symbol 51, a left side data symbol 52, a middle separator 53, a right side data symbol 54, a check symbol 55, a stop symbol 56, and a right blank section 58. The Z value of the bar code is the width of a single module of the bar code, and when the amplification factor of the bar code is determined, the width of the single module is determined. For an EAN-13 barcode, the minimum width of the left blank 57 is 11 modules wide, 11Z, the width of the initiator 51 to terminator 56 is 95 modules wide, 95Z, and the minimum width of the right blank 58 is 7 modules wide. It can be calculated that the slope of the magnification reference line in the left blank measurement region should be k1=1z/95z=11/95, and the slope of the magnification reference line in the right blank measurement region should be k2=7z/95z=7/95.
Referring to fig. 6, in the left blank measurement area, the ratio of the Y-axis coordinate to the X-axis coordinate of any point on the magnification reference line OP is 11:95, and the included angle between the magnification reference line OP and the X-axis is α. And the mapping reference line AP maps the Y-axis coordinate of the point on the multiplying power reference line to the X-axis through the equal scale reference line AB, and the ratio of OA to OP is converted into the ratio of OB to OP, which is 11:95.
And when the comparison test is carried out, the comparison ruler is covered on the bar code, so that the bar code module is projected on the module measuring part, one side edge of the bar code module is aligned with the Y axis, then the actual intersection point of the other side edge of the bar code module and the multiplying power reference line is obtained, the Y axis coordinate of the actual intersection point can be obtained by the mapping reference line and the equal scale reference line and mapped to the reference position point of the X axis of the blank measuring part, the reference position point is used as the minimum value of the allowed blank width to determine the qualified width range of the bar code blank, whether the edge of the bar code blank falls in the qualified width range of the bar code blank is judged, and whether the blank width of the measured bar code is qualified can be quickly read and judged.
Example 3
Referring to fig. 2, unlike embodiment 2, the Y axes of the left and right empty measurement areas are on the same straight line, the empty measurement portion of the left empty measurement area is adjacent to the module measurement portion of the right empty measurement area, and the module measurement portion of the left empty measurement area is adjacent to the empty measurement portion of the right empty measurement area.
However, in this embodiment, since the length of the module measuring portion is adapted to the total length of the bar code, and the module measuring portions of the left and right empty measuring regions are extended away from each other, the length of the whole comparison plate body must be greater than twice the total length of the bar code, and the comparison plate is too long, which is inconvenient to carry, place and use, so that the embodiment does not affect the detection of the width of the empty region of the bar code, but is not the preferred embodiment.
Example 4
The bar code Z value, namely the single module width, under different amplification factors and the amplification factor range of the bar code are specified in the bar code standard, so that the width size and the length of the bar code under different amplification factors are also different. Therefore, on the basis of embodiments 1 to 3, the present embodiment considers the possible range of the size of the actual barcode, and makes the design that the comparator can detect the total width of the barcode module on the premise of minimizing the size of the comparator, specifically as follows.
Referring to fig. 3, in the left blank measurement area and the right blank measurement area, the X-axis coordinate value of the end point of the magnification reference line far from the respective origin is at least equal to the total width upper limit value of the barcode module corresponding to the set maximum magnification factor, and in general, it is preferable that the X-axis coordinate value of the end point of the magnification reference line is far greater than the total width upper limit value of the barcode module.
Meanwhile, at least a module measuring part of the left blank measuring area or the right blank measuring area is provided with an amplification factor reference line parallel to the Y axis, wherein the amplification factor reference line comprises a maximum factor reference line and a minimum factor reference line, an X-axis coordinate value of a point where the maximum factor reference line and the magnification reference line intersect is equal to a set maximum amplification factor corresponding bar code module total width upper limit value, and an X-axis coordinate value of a point where the minimum factor reference line and the magnification reference line intersect is equal to a set minimum amplification factor corresponding bar code module total width lower limit value.
During contrast detection, the bar code is projected on the module measuring part, one side edge is aligned with the Y axis, if the other side edge exceeds the range defined between the two amplification factor reference lines, the total width of the bar code module is not qualified, and the detection of the blank area width is not needed. Because the detection of the total width of the bar code only needs to be detected once, the amplification factor reference line can be only arranged in the left-hand measuring area or the right-hand measuring area, and can be also arranged in both the left-hand measuring area and the right-hand measuring area.
For EAN-13 codes, the theoretical value of the single module width is represented by X dimension, the actual value is represented by Z dimension, the X value under 1-time magnification is 0.330mm, the standard bar code magnification range is 0.80-2.00, and the corresponding standard X value range is 0.264 mm-0.660 mm. Therefore, in the present embodiment shown in fig. 3, the module measuring section of the left empty measuring area sets a minimum coefficient reference line corresponding to a magnification factor of 0.8 times at the X-axis coordinate of 0.264mm, sets a base coefficient reference line corresponding to a magnification factor of 10 times at the X-axis coordinate of 0.330mm, sets a maximum coefficient reference line corresponding to a magnification factor of 2.0 times at the X-axis coordinate of 0.660mm, and is marked as "0.8 times base line", "1.0 times base line", and "2.0 times base line", respectively. The marks on the comparison plates together with the left blank, the right blank and the like are all used for enabling a user to clearly distinguish different measurement areas and comparison references so as to more efficiently finish bar code comparison detection.
Furthermore, in consideration of the fact that the blank area comparison is not needed for the bar code with the unqualified total width of the bar code module, preferably, points of intersection of two reference lines at the extreme edge and the multiplying power reference line in the plurality of mapping reference lines are points of intersection of the minimum coefficient reference line and the maximum coefficient reference line and the multiplying power reference line respectively.
Example 5
This example describes a method of comparing a commodity barcode comparator achievable using any of the embodiments of examples 1 to 4, comprising:
a) When the left empty measurement area is used for bar code alignment, the bar code alignment is shown in fig. 7:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the left blank measurement area to coincide with the outer side edge line of the first module of the bar code initiator, projecting the bar code on the module measurement part of the left blank measurement area, and projecting the bar code left blank area on the blank area measurement part of the left blank measurement area;
Acquiring an actual intersection point of an outer edge line of a last module of the bar code terminator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis by connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a left blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether a boundary line of the left blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the left blank area of the bar code is qualified;
b) When the right empty measurement area is used for bar code alignment, reference is made to fig. 8:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the right empty measuring area to coincide with the outer side edge line of the last module of the bar code terminator, projecting the bar code on the module measuring part of the right empty measuring area, and projecting the bar code right empty area on the empty area measuring part of the right empty measuring area;
Acquiring an actual intersection point of an edge line at the outer side of a first module of a bar code initiator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis through connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a right blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether the boundary line of the right blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the right blank area of the bar code is qualified.
The detection method of the embodiment can be carried out without considering whether the total width value of the bar code module is qualified or not, or after detecting the Z value of the bar code and the total width value of the module by other means. It should be noted that, the detection sequence of the left blank area and the right blank area is adjustable, and there is no restriction. Furthermore, the comparison detection of the width of the other blank area can be stopped after the comparison detection of the blank area is finished and the blank area width is judged to be unqualified, because the quality of the corresponding bar code can be judged to be unqualified at the moment.
Example 6
The embodiment introduces an comparison method of the commodity bar code comparator, wherein the adopted comparator is as in the embodiment 1 to the embodiment 4, and the comparator also meets the requirement that on a comparison plate body of the commodity bar code comparator, at least a module measuring part of a left blank measuring area or a right blank measuring area is provided with an amplification factor reference line parallel to a Y axis, wherein the amplification factor reference line comprises a maximum coefficient reference line and a minimum coefficient reference line, an X-axis coordinate value of a point where the maximum coefficient reference line and the multiplying power reference line intersect is equal to a set maximum amplification factor corresponding bar code module total width upper limit value, and an X-axis coordinate value of a point where the minimum coefficient reference line and the multiplying power reference line intersect is equal to a set minimum amplification factor corresponding bar code module total width lower limit value;
In the method of this embodiment, step a and step B may adjust the comparison sequence according to the setting area of the amplification factor reference line on the comparison board, if the amplification factor reference line is set in the left space measurement area, the comparison of the total width of the module is performed by using the left space measurement area, and after the comparison of the total width of the module is qualified, the comparison detection of the left space area is performed, and finally the comparison detection of the right space area is performed by using the right space measurement area. If the two measuring areas are provided with Z value range reference lines, selecting any one of the left empty measuring area or the right empty measuring area for comparison detection in advance.
Referring to fig. 3, 7 and 8, the comparison method of the present embodiment includes:
S1, performing module width comparison by using a left blank measurement area or a right blank measurement area provided with an amplification factor reference line, wherein the module width comparison comprises the steps of covering a comparison plate body on the surface of a bar code to be detected, enabling the bar code to be projected on a module measurement part, enabling one side edge line of the bar code module to coincide with a Y axis, judging whether the other side edge line of the bar code module is positioned between a maximum factor reference line and a minimum factor reference line, if the maximum factor reference line and the minimum factor reference line are met, judging that the width of the bar code module is qualified, and if the maximum factor reference line and the minimum factor reference line are not met, judging that the width of the bar code module is not qualified, and stopping comparison detection;
s2, detecting the width of a bar code blank area, comprising the following steps:
a) When the left empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the left blank measurement area to coincide with the outer side edge line of the first module of the bar code initiator, projecting the bar code on the module measurement part of the left blank measurement area, and projecting the bar code left blank area on the blank area measurement part of the left blank measurement area;
Acquiring an actual intersection point of an outer edge line of a last module of the bar code terminator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis by connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a left blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether a boundary line of the left blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the left blank area of the bar code is qualified;
B) When the right empty measuring area is used for bar code comparison:
Covering the comparison plate body on the surface of the bar code to be detected, enabling the Y axis of the right empty measuring area to coincide with the outer side edge line of the last module of the bar code terminator, projecting the bar code on the module measuring part of the right empty measuring area, and projecting the bar code right empty area on the empty area measuring part of the right empty measuring area;
Acquiring an actual intersection point of an edge line at the outer side of a first module of a bar code initiator and the multiplying power reference line, selecting a mapping reference line which is nearest to the actual intersection point or passes through the actual intersection point, acquiring connection points of the scale reference lines and an X axis through connecting equal scale reference lines of the mapping reference line, and determining a reference position point of a minimum width boundary of a right blank area of the bar code on the X axis according to the position of the connection points and the position relation between the selected mapping reference line and the actual intersection point;
judging whether the boundary line of the right blank area of the bar code and the X axis intersect at the reference position point or one side of the reference position point deviating from the origin, if so, the width of the right blank area of the bar code is qualified.
Similarly, in step S2, if the blank area comparison detection performed first is finished and it is determined that the blank area width is not acceptable, the comparison detection of the other blank area width may be stopped, because it may already be determined that the corresponding barcode quality is not acceptable.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by one of ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which fall within the protection of the present invention.
Claims (10)
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