WO2017036265A1 - Qr 码位置探测图形破损时的解码方法及系统 - Google Patents
Qr 码位置探测图形破损时的解码方法及系统 Download PDFInfo
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- WO2017036265A1 WO2017036265A1 PCT/CN2016/091971 CN2016091971W WO2017036265A1 WO 2017036265 A1 WO2017036265 A1 WO 2017036265A1 CN 2016091971 W CN2016091971 W CN 2016091971W WO 2017036265 A1 WO2017036265 A1 WO 2017036265A1
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- patterns
- pattern
- position detection
- positioning
- dimensional code
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06K7/1417—2D bar codes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06K7/1456—Methods for optical code recognition including a method step for retrieval of the optical code determining the orientation of the optical code with respect to the reader and correcting therefore
Definitions
- the present invention relates to the field of two-dimensional code technology, and in particular, to a decoding method and system for QR code position detection pattern damage.
- QR codes are more and more widely used, and due to environmental influences, QR code images may be damaged. Since the QR code itself contains the functional area and the coding area, with some features of the functional area, the QR code image information is still recoverable and recognizable after the QR code is damaged to a certain extent.
- the functional area of the QR code includes a position detection pattern (1), a position detection pattern separator (2), a positioning pattern (3), a correction pattern (4), and an encoding area including a format information graphic (5), version Information graphics (6), data information graphics (7).
- the positioning of the QR code is usually achieved by recognizing the three position detection patterns, but if the position detection pattern is broken, the QR code cannot be located in a conventional manner.
- the Chinese invention patent No. CN104463059A discloses a reconstruction method for detecting a damaged pattern in a QR code recognition. According to the other two detection patterns and the positioning pattern of the lower right corner of the standard QR code pattern, The three detection patterns are reconstructed and reconstructed, and three sets of squares are reconstructed in the process of reconstruction. However, only one set of squares is relatively consistent with the actual figure, so the method has certain redundancy.
- the positioning graphic in the lower right corner of the application file is actually a correction graphic, and the number of the same graphic image in the lower right corner is more than one in the QR code image, so the process is complicated and reconstructed by this method. The efficiency is relatively low.
- the technical problem to be solved by the present invention is to provide a decoding method and system for a QR code position detection pattern damage ⁇ with high efficiency and small error.
- a decoding method for QR code position detection pattern damage [0006] A decoding method for QR code position detection pattern damage , [0007] performing binarization on the received image including the two-dimensional code pattern, and searching for a position detection pattern;
- the beneficial effects of the present invention are: determining the positional relationship between the two position detection patterns found by using the geometric relationship between the boundary lines and the vertices of the two position detection patterns, and determining the two-dimensional shape by combining the function graphics of the positioning patterns.
- the area where the code pattern is located and the rotation angle of the two-dimensional code pattern, the area where the damaged position detection pattern is located can also be directly inferred.
- the method of identifying the QR code is relatively straightforward and efficient; according to the black and white boundary line and the position detection pattern on the positioning pattern The two-dimensional code pattern is meshed, and the error of decoding the QR code is small.
- a decoding system for QR code position detection pattern damage comprising: a binarization module, a first search module, a statistics module, a judgment module, a second search module, a determination module, a mesh division module, Decoding module,
- a binarization module that binarizes the received image including the two-dimensional code pattern
- a first searching module configured to search for a position detection pattern in an image that receives the included two-dimensional code graphic
- a statistical module configured to calculate an equation of a line where the boundary lines of the two position detection patterns are located, a vertex coordinate, and calculate a data bit width of the two-dimensional code pattern
- a judging module configured to determine, by using a geometric relationship between a boundary line and a vertex of the two position detecting patterns, whether the positional relationship between the two position detecting patterns is an adjacent relationship or a diagonal relationship;
- the second searching module is configured to find a positioning pattern between the two position detecting patterns that determine the positional relationship according to the positional relationship of the two position detecting patterns, the positional features of the positioning patterns, and the black and white graphic features;
- a determining module configured to determine an area where the two-dimensional code graphic is located according to the two position detecting patterns and the positioning graphic
- a mesh dividing module configured to detect the graphic, the positioning graphic, and the two-dimensional code graphic according to the two positions The data bit width is meshed to the area where the two-dimensional code graphic is located
- a decoding module configured to decode the meshed two-dimensional code pattern.
- the beneficial effects of the present invention are: finding a position detection pattern in the received image containing the two-dimensional code pattern by the binary module and the first finding module, and the two position detection patterns pass the statistics module, the judgment module, The second searching module and the determining module determine the region where the two-dimensional code graphic is located, and divide and decode the region where the two-dimensional code graphic is located by using the mesh dividing module and the decoding module.
- the system structure is reasonable, and the decoding has a position detecting graphic.
- the damaged two-dimensional code pattern has high efficiency and small error.
- 1 is a schematic structural diagram of a QR code functional area and a coding area
- FIG. 2 is a flowchart of a method for decoding a QR code position detection pattern damage according to Embodiments 1 and 2 of the present invention
- FIG. 3 is a second position detection pattern of a QR code according to Embodiments 1 and 2 of the present invention. Schematic diagram of the vertices and boundary lines of Q1;
- FIG. 4 is a schematic diagram showing the structure of the vertices and boundary lines of the two position detecting patterns Q2 of the QR code according to the first and second embodiments of the present invention
- FIG. 5 is a schematic structural diagram of a suspected positioning pattern area in which the positional relationship between two position detecting patterns is an adjacent relationship according to the first embodiment of the present invention
- FIG. 6 is a schematic structural diagram of a positional relationship of two position detecting patterns in which the two-dimensional code pattern of the adjacent relationship ⁇ is divided along the first direction according to the first embodiment of the present invention
- FIG. 7 is a schematic structural diagram of a positional relationship of two position detection patterns in which the two-dimensional code patterns of the adjacent relationship ⁇ are divided along the first direction and then divided in the second direction according to the first embodiment of the present invention
- 8 is a schematic structural diagram of a suspected positioning pattern area in which a positional relationship between two position detecting patterns is a diagonal relationship ⁇ according to a second embodiment of the present invention
- FIG. 9 is a schematic structural diagram of a two-dimensional code pattern in which a positional relationship between two position detecting patterns is a diagonal relationship ⁇ according to a second embodiment of the present invention.
- FIG. 10 is a system block diagram of a decoding system for QR code position detection pattern damage according to Embodiment 3 of the present invention.
- format information graphics 6, version information graphics; 7, data information graphics;
- Binarization module 12. First seeking module; 13. Statistics module; 14. Judging module;
- Second finding module 16, determining module; 17, meshing module; 18, decoding module;
- the most critical idea of the present invention is: according to the positioning pattern located between the position detection patterns, occupying a width of a data bit width, and having black and white phase, continuous black dots and continuous white points occupy a data bit width
- the two-dimensional code pattern has high recognition efficiency and small error.
- a specific embodiment of the invention is:
- the method further includes:
- the received image including the two-dimensional code pattern is not decoded by the above method.
- the width of the side length of the position detecting pattern can be calculated according to the equation of the straight line where the boundary line of the two position detecting patterns is located, and the vertex coordinates;
- the quotient obtained by dividing the width of the side length of the position detecting pattern by 7 is the data bit width of the two-dimensional code pattern.
- the data bit width of the two-dimensional code pattern is calculated according to the feature that the side length of the position detection pattern includes seven data bit widths, and the side length of the position detection pattern passes through the line equation of the boundary line of the position detection pattern.
- the fixed point coordinates can be directly calculated using the geometric relationship, and the method is reasonable.
- the geometric relationship between the boundary line and the vertices of the two position detecting patterns is used to determine whether the positional relationship between the two position detecting patterns is an adjacent relationship or a diagonal relationship, specifically:
- intersection of two straight lines on the first pair of boundary lines and the intersection of two straight lines on the second pair of boundary lines have the same vertex positions on the position detection pattern, and the first pair of boundary lines correspond to two
- the straight lines are perpendicular to each other, and the two straight lines corresponding to the second pair of boundary lines are also perpendicular to each other, and the two slopes of the two straight lines corresponding to the first pair of boundary lines are the same as the two slopes of the two straight lines corresponding to the second pair of boundary lines.
- the positional relationship of the two position detection patterns is an adjacent relationship, the two intersection points of the first pair of boundary lines and the second pair of boundary lines are respectively
- the distance between the two intersection points and the first vertex or the second vertex is calculated, and as long as one of the two distance values is smaller than the point distance threshold, the two positions can be determined.
- the positional relationship of the detection pattern is an adjacent relationship. In an ideal state, one of the two distance values is equal to 0. In order to eliminate the boundary line, the value of the vertex and the error generated by the calculation process, the setting is set.
- the threshold value if the positional relationship of the two position detection patterns is relative, the distance between the two intersection points to any one of the vertices is greater than the width of the position detection pattern, so the maximum value of the point distance threshold can be set to the position
- the width value of the pattern is detected, the method is reasonable and the calculation is simple, and the efficiency and accuracy of identifying the QR code are improved.
- the geometric relationship between the boundary line and the vertex of the two position detection patterns is used to determine whether the positional relationship between the two position detection patterns is an adjacent relationship or a diagonal relationship, specifically:
- [0071] preset a straight line distance threshold, and respectively calculate a distance between two boundary lines parallel to each other among the four boundary lines of the other position detecting pattern to a boundary line parallel to the two boundary lines in the first pair of boundary lines, Get four distance values;
- one of the four distance values is equal to 0.
- the linear distance threshold is set;
- the positional relationship of the detection pattern is a relative relationship, and the four distance values are greater than the width of the position detection pattern, so the maximum value of the line distance threshold can be set to the width value of the position detection pattern, and the method is reasonable and simple to calculate. Improve the efficiency and accuracy of identifying QR codes.
- the positioning pattern between the two position detecting patterns that determine the positional relationship is found according to the positional features of the positioning pattern and the black and white graphic features. , Specifically:
- the positional relationship of the two position detecting patterns is an adjacent relationship
- [0078] preset a numerical similarity threshold, and select, in the ratio of the two suspected positioning patterns, a proportion of the suspected positioning figure that satisfies the condition that the difference between the two values is less than the numerical similarity threshold condition as the positioning graphic area;
- the graphic corresponding to the positioning graphic area is a positioning graphic.
- the area between the two position detecting patterns has a positioning pattern, and the positioning pattern is between the two positions detecting patterns.
- the length is equal to the distance between the two position detection patterns relative to the boundary line
- the width is equal to one data bit width of the two-dimensional code pattern
- the number of consecutive black points on the positioning pattern is similar to the number of consecutive white points
- the continuous black point and the continuous white point occupy a data bit width
- the two suspected positioning patterns are located between the two position detecting patterns, and coincide with one of the two position detecting pattern edges by one data bit width; Judging whether it is a positioning graphic in a suspected positioning graphic, only need to judge continuous black dots and continuous white Whether the difference between the number of points is within a preset numerical similarity threshold, the method data is relatively straightforward, and the efficiency of identifying the positioning pattern is high and the error is small.
- the received two-dimensional code images are meshed according to the data bit widths of the two position detection patterns, the positioning patterns, and the two-dimensional code patterns. , Specifically:
- the positional relationship of the two position detecting patterns is an adjacent relationship
- a direction perpendicular to a longitudinal direction of the positioning pattern area is a first direction, and a direction parallel to a length direction of the positioning pattern area is a second direction;
- the first direction of the area where the positioning pattern is located is divided according to the boundary line of the black and white pixel points in the positioning pattern, and the area where the position detecting pattern is located is divided according to the data bit width, and two position detecting patterns are known.
- the two-dimensional code pattern can be inferred on the side of the positioning pattern sought, and the width of the two-dimensional code pattern in the first direction is in the second
- the width in the direction is the same, that is, the square area
- the width of the two-dimensional code pattern in the second direction is the distance between the outermost relative boundary lines of the two position detection patterns, and the distance can be obtained, and the two-dimensional code pattern is obtained.
- the width in the first direction can be obtained, and the first direction of the two-dimensional code pattern is divided according to the data bit width. The method can accurately divide the two-dimensional code pattern, and the decoding error is small.
- the positioning pattern between the two position detecting patterns that determine the positional relationship is found according to the positional features of the positioning pattern and the black and white graphic features. , Specifically:
- the positional relationship of the two position detecting patterns is a diagonal relationship
- [0093] preset a numerical similarity threshold, and select, in the ratio of the four suspected positioning patterns, a ratio of two suspected positioning patterns satisfying the difference between the two values and the numerical similarity threshold and the mutually perpendicular condition as two Positioning the graphics area;
- the graphic corresponding to the two positioning graphic regions is a positioning graphic.
- the positional relationship of the two position detecting patterns is a diagonal relationship
- the two positioning patterns found have the characteristics of being perpendicular to each other. If the two positioning patterns found are not perpendicular to each other, the search for the positioning pattern fails, and the two-dimensional code pattern is not performed. Decoding; the number of consecutive black points on the positioning pattern is similar to the number of consecutive white points, and the continuous black point and the continuous white point occupy a data bit width, and determine whether the positioning is in the four suspect positioning patterns.
- the figure only needs to judge whether the difference between the continuous black point and the number of consecutive white points is within a preset numerical similarity threshold, and the method data is relatively straightforward;
- the two positioning graphic areas are mutually Vertical means that the length direction or the width direction is perpendicular to each other, and the corner where two mutually perpendicular positioning patterns intersect is the broken position.
- the area where the pattern is detected is detected, and the method for identifying the positioning pattern in the two positioning pattern areas is high in efficiency and small in error.
- the received two-dimensional code images are meshed according to the data bit widths of the two position detecting patterns, the positioning patterns, and the two-dimensional code patterns. , Specifically:
- the positional relationship of the two position detecting patterns is a diagonal relationship
- the area where the two-dimensional code pattern is located is a square area, and each of the positioning pattern areas is divided perpendicularly to the length direction of the positioning pattern according to the boundary line of the black and white pixel points in the positioning pattern, and then the data is widened according to the data.
- the two position detection patterns are divided, and the mesh division of the two-dimensional code graphics can be completed.
- the meshing method is accurate and effectively ensures the correct decoding of the two-dimensional code graphic.
- the first embodiment of the present invention is:
- the width of the side length of the position detecting pattern can be calculated according to the equation of the straight line where the boundary line of the two position detecting patterns is located, and the vertex coordinates;
- the quotient obtained by dividing the width of the side length of the position detecting pattern by 7 is the data bit width W of the two-dimensional code pattern
- the geometric relationship between the boundary line and the vertices of the two position detecting patterns is used to determine whether the positional relationship between the two position detecting patterns is an adjacent relationship or a diagonal relationship, specifically:
- the two position detection patterns are respectively labeled as Q1 and Q2, and the vertices of the two position detection patterns Q1 and Q2 are separated into I1 as Ql.l, Q1.2, Q1.3, Q1.4 and Q2.1, Q2.2, Q2.3, Q2.4, the four boundary lines of the two position detection patterns Ql and Q2 are Ql.l, Ql.u, Ql.r, Ql.d and Q2.1,
- the preset point distance threshold is W, and the distance between the two intersection points and the first vertex or the second vertex is calculated to obtain two distance values; in fact, the point distance threshold may be set to be greater than or equal to 0, and less than or equal to Any value within the range of values of W;
- the positional relationship between the two position detection patterns is an adjacent relationship
- the positional relationship between the two position detection patterns, the positional features of the positioning patterns, and the black and white graphic features are used to find a positional relationship.
- the positioning pattern between the two position detection patterns is specifically as follows:
- [0120] preset a numerical similarity threshold, and select, in the ratio of the two suspected positioning patterns, a proportion of the suspected positioning figure that satisfies the condition that the difference between the two values is less than the numerical similarity threshold condition as the positioning graphic area;
- the graphic corresponding to the positioning graphic area is a positioning graphic
- the area of the two-dimensional code patterns is meshed, specifically:
- a direction perpendicular to a length direction of the positioning pattern area is a first direction, and a direction parallel to a length direction of the positioning pattern area is a second direction;
- the first direction of the positioning pattern area is divided according to the boundary line of the black and white pixel points in the positioning pattern
- the second bit direction of the area where the two-dimensional code pattern is located is divided according to the data bit width
- FIG. 1 to FIG. 4, FIG. 8, and FIG. 9, the second embodiment of the present invention is:
- the positional relationship between the two position detecting patterns is a diagonal relationship
- two position detecting patterns for determining the positional relationship are found according to the positional relationship of the two position detecting patterns, the positional features of the positioning patterns, and the black and white graphic features.
- the positioning pattern between them is as follows:
- [0136] preset a numerical similarity threshold, and select, in the ratio of the four suspected positioning patterns, a ratio of two suspected positioning patterns satisfying any two numerical values that are smaller than the numerical similarity threshold and mutually perpendicular conditions as two Positioning the graphics area;
- the graphic corresponding to the two positioning graphic regions is a positioning graphic
- the data width of the two-dimensional code pattern is meshed according to the data width of the two position detection patterns, the positioning pattern, and the two-dimensional code pattern, specifically:
- a decoding system for QR code position detection pattern damage includes a binarization module 11, a first search module 12, a statistics module 13, a determination module 14, a second search module 15, and a determination module. 16 , the meshing module 17, the decoding module 18,
- the binarization module 11 binarizes the received image including the two-dimensional code pattern
- the first searching module 12 is configured to search for a position detection graphic in the received image that includes the two-dimensional code graphic.
- the statistics module 13 is configured to calculate an equation of a line where the boundary lines of the two position detection patterns are located, a vertex coordinate, and calculate a data bit width of the two-dimensional code pattern;
- the determining module 14 is configured to determine, by using a geometric relationship between a boundary line and a vertex of the two position detecting patterns, whether the positional relationship between the two position detecting patterns is an adjacent relationship or a diagonal relationship;
- the second searching module 15 is configured to find a positioning pattern between the two position detecting patterns that determine the positional relationship according to the positional relationship of the two position detecting patterns, the positional features of the positioning patterns, and the black and white graphic features;
- the determining module 16 is configured to determine a region where the two-dimensional code graphic is located according to the two position detecting patterns and the positioning pattern
- the meshing module 17 is configured to mesh the region where the two-dimensional code graphic is located according to the data bit widths of the two position detecting patterns, the positioning patterns, and the two-dimensional code patterns;
- the decoding module 18 is configured to decode the meshed two-dimensional code pattern.
- Embodiment 3 of the present invention is:
- a decoding system for QR code position detection pattern damage comprising a binarization module 11, a first search module 12, a statistics module 13, a determination module 14, a second search module 15, a determination module 16, a mesh division Module 17, decoding module 18,
- the binarization module 11 binarizes the received image including the two-dimensional code pattern
- the first searching module 12 is configured to search for a position detection graphic in the received image that includes the two-dimensional code graphic.
- the statistics module 13 is configured to calculate an equation of a line where the boundary lines of the two position detection patterns are located, a vertex coordinate, and calculate a data bit width of the two-dimensional code pattern;
- the determining module 14 is configured to determine, by using a geometric relationship between a boundary line and a vertex of the two position detecting patterns, whether the positional relationship between the two position detecting patterns is an adjacent relationship or a diagonal relationship;
- the second searching module 15 is configured to find a position between the two position detecting patterns that determine the positional relationship according to the positional relationship of the two position detecting patterns, the positional features of the positioning patterns, and the black and white graphic features.
- the determining module 16 is configured to determine a region where the two-dimensional code graphic is located according to the two position detecting patterns and the positioning pattern
- the meshing module 17 is configured to mesh the region where the two-dimensional code graphic is located according to the data bit widths of the two position detecting patterns, the positioning patterns, and the two-dimensional code patterns;
- the decoding module 18 is configured to decode the meshed two-dimensional code pattern.
- the present invention provides a decoding method and system for QR code position detection pattern damage.
- the two position detection patterns are first determined by geometric relationship. The positional relationship between the two, then find the positioning pattern, determine the area where the two-dimensional code graphic is located, and finally decode the area where the two-dimensional code graphic is located, and the method does not have redundant calculation, and fully utilizes the position detection pattern and the positioning pattern.
- the feature of identifying a two-dimensional code pattern is high in efficiency and small in error.
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EP16840694.0A EP3330885B1 (en) | 2015-09-02 | 2016-07-28 | Decoding method and system for use when qr code position detection graph is damaged |
BR112018003692-7A BR112018003692B1 (pt) | 2015-09-02 | 2016-07-28 | Método de decodificação e sistema para qr code com um padrão de detecção de posição danificada |
US15/895,199 US10438038B2 (en) | 2015-09-02 | 2018-02-13 | Decoding method and system for QR code with one damaged position detection pattern |
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CN201510553171.1 | 2015-09-02 | ||
CN201510553171.1A CN105138943B (zh) | 2015-09-02 | 2015-09-02 | Qr码位置探测图形破损时的解码方法及系统 |
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US15/895,199 Continuation US10438038B2 (en) | 2015-09-02 | 2018-02-13 | Decoding method and system for QR code with one damaged position detection pattern |
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US20180165492A1 (en) | 2018-06-14 |
EP3330885B1 (en) | 2020-10-07 |
BR112018003692A2 (pt) | 2018-09-25 |
CN105138943A (zh) | 2015-12-09 |
EP3330885A1 (en) | 2018-06-06 |
US10438038B2 (en) | 2019-10-08 |
EP3330885A4 (en) | 2018-09-05 |
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