JP2011076395A - Two-dimensional code, two-dimensional code reader and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an image representing a two-dimensional code from being influenced by an imaging environment, in specifying a color assigned to a cell in the two-dimensional code. <P>SOLUTION: In the two-dimensional code 100, each cell group is marked with an information color or combination color associated with information to be represented by the cell group, and each cell C in the cell group is marked with the color of a specific coordinate in a component area arranged in a positional relation without mutual interference in a component model showing a distribution of color components. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a two-dimensional code in which cells are arranged, and a two-dimensional code reader that reads the two-dimensional code and identifies information.

The applicant of the present application has proposed a two-dimensional code having a large information capacity in which information is encoded by coloring each of a plurality of cells (see Patent Document 1).
In this two-dimensional code, since the information represented by the cell is encoded by a method of attaching one of a plurality of colors to the same cell, the information capacity per single cell can be increased, The information capacity of the entire two-dimensional code can be increased.

JP 2007-048070 A

  However, in the above two-dimensional code, when specifying the color attached to the cell on the code reader side, it is specified as a different color depending on the shooting environment of the image representing the two-dimensional code. Information could be mistakenly identified.

  The present invention has been made to solve such problems, and its purpose is to determine the influence of the shooting environment on the image representing the two-dimensional code when specifying the color attached to the cell in the two-dimensional code. It is to provide technology to make it difficult to receive.

  In order to solve the above problem, a first configuration (Claim 1) is a two-dimensional code in which cells are arranged in m × n (1 ≦ m, 1 ≦ n), and is arranged in the m × n. When each cell is divided into cell groups each composed of one or more cells, each cell group has a plurality of colors (hereinafter referred to as “information colors”) or combinations of colors (hereinafter “combinations”) associated with different information. Color)), and is marked with the information color or the combination color associated with the information to be shown in the cell group, and each of the multidimensional spaces in the multidimensional space representing the distribution of the color components. When a component model in which a plurality of component areas expanding as a region are arranged in a positional relationship in which the component areas do not interfere with each other is determined, the component represented by specific coordinates in the component area arranged in the component model The The cell group is marked as a component of the information color or a component of each color in the combination color.

  In the two-dimensional code configured in this way, each cell group is marked with an information color or combination color associated with information to be shown in the cell group, and each cell mark in the cell group is marked with Of the component models representing the distribution of the color components, the color is assigned with a specific coordinate color within the component region arranged in a positional relationship that does not interfere with each other.

  In other words, the mark attached to each cell does not interfere with other cells, except for cells marked with the same component area color, so at least the color assigned to each cell If it is possible to identify whether it is within the component area of the component area, it is determined that the mark is attached with the color of the specific coordinate in the component area without specifying the color of the specific coordinate in the component area. be able to.

  This means that even if a cell is marked with a color different from the original color depending on the shooting environment of the image representing the two-dimensional code, if the mark color is within the component area, that color Can be specified as the color of a specific coordinate, that is, the original color.

  In this way, even if the color is different from the original color depending on the shooting environment, the effect can be suppressed by the component area, so the mark color in each cell can be determined appropriately, and as a result, it is represented by a cell group. Information can be prevented from being mistakenly identified.

  In this configuration, “marking a cell group” means, for example, filling each cell in the cell group, recording a specific symbol in each cell, and a specific figure (for example, various figures such as a circle and a polygon). And so on.

In addition, the component model in the above configuration only needs to represent the distribution of color components in a multidimensional space, and the space may be a two-dimensional space or more.
In the above configuration, the component areas arranged in the component model need only be defined by the number of colors to be used in the two-dimensional code. The specific number is not particularly limited. Here, “do not interfere” means that the component regions are arranged so as not to overlap each other. For this purpose, for example, it is conceivable to arrange each of the component regions at a predetermined interval or more.

  In addition, this component region may be defined as a space that can sufficiently include a range of errors that can occur according to the image capturing environment. For example, a color at a specific coordinate is set as a color under a general shooting environment, and an area including a range of errors that can be generated depending on the shooting environment from this color may be set as a component area. It is conceivable to make the above configuration as a second configuration (claim 2) shown below.

  In the second configuration, each of the component models is arranged such that each of the component regions extending around the specific coordinates is used as a component in a plurality of information colors or a component of each color in a plurality of combination colors. Each component represented by the center coordinates in the component region is used.

  With this configuration, since the original color is the center coordinate of the component region, even in a cell that is marked with a color different from the original color depending on the shooting environment of the image representing the two-dimensional code, It becomes difficult for the color of the mark to protrude outside the component area, and there is a high possibility that the color can be specified as the color of a specific coordinate, that is, the original color.

Moreover, each said structure is good to make it like the 3rd structure (Claim 3) shown below.
In the third configuration, each of the cells arranged in the m × n is divided by a separator with a predetermined color, and at a specific coordinate in the component area arranged in the component model. Each of the represented components is used as a component in the plurality of information colors or a component of each color in the plurality of combination colors and a component of the color attached to the separator.

  In this configuration, since the separator is formed with a color of the component area different from the color of the mark attached to the cell, it is formed in a state different from the original color depending on the shooting environment of the image representing the two-dimensional code. Even in the case of a separator, if the color is within the component region, the color can be specified as the original color, that is, the separator without fail.

  In order to solve the above-mentioned problem, a fourth configuration (claim 4) is a two-dimensional system for identifying information by reading a two-dimensional code in which cells are arranged in m × n (1 ≦ m, 1 ≦ n). A code reader for acquiring an image indicating the two-dimensional code, and from each of the images acquired by the image acquiring means, a mark attached to each cell in the two-dimensional code indicated by the image Information corresponding to a color or a combination of colors assigned to a cell group consisting of one or more cells in the two-dimensional code based on a cell specifying means for specifying a color and the color of the cell specified by the cell specifying means Each of the specified information is identified based on a database in which the correspondence relationship between the color or color combination of the cell group including one or more cells and the information is registered, and each of the identified information is acquired by the image acquisition. Comprises an information acquisition means for acquiring an information group to be identified from the two-dimensional code represented by the acquired image by the step, the.

  Then, when a component model in which a plurality of component regions each expanding as a multidimensional region are arranged in a positional relationship in which the component regions do not interfere with each other in a multidimensional space representing the distribution of color components is determined, the cell identification The means determines, for each cell in the two-dimensional code, to which component region arranged in the component model the color component attached to the cell is distributed, The color of the component represented by specific coordinates in the determined component area is specified as the color attached to the cell.

The two-dimensional code reader configured as described above is suitable for identifying information from the two-dimensional code according to any one of the first to third configurations.
Further, in this configuration, when the component model is one in which each of the component regions extending around the specific coordinates is arranged, the fifth configuration (Claim 5) shown below is preferable. .

  In this configuration, for each cell at each position in the two-dimensional code, the cell specifying unit distributes the color component attached to the cell to any of the component regions arranged in the component model. The color of the component represented by the center coordinates in the determined component area is specified as the color attached to the cell.

This configuration is suitable for identifying information from the two-dimensional code according to the second configuration or the third configuration based on this configuration.
In addition, the fourth or fifth configuration described above may be a sixth configuration (claim 6) described below.

  In this configuration, the cell specifying means has a color represented by a component in the component region allocated to the separator and separating each cell in the two-dimensional code among the component regions arranged in the component model. Are identified from the image area of the image acquired by the image acquisition means, the identified area is regarded as a separator in the two-dimensional code, and each of the areas divided into the separator is a cell in the two-dimensional code. Specify as the position of.

This configuration is suitable for identifying information from the two-dimensional code according to the third configuration.
Moreover, in order to solve the said subject, it is good also as a program (Claim 7) for functioning a computer as all the means with which the two-dimensional code reader which concerns on any one of the structure from 4th to 6th is equipped.

The computer controlled by this program can constitute a part of the two-dimensional code reader according to any one of the fourth to sixth configurations.
Note that the above-described program is composed of an ordered sequence of instructions suitable for processing by a computer system, and can be used for a two-dimensional code reader or a user using the same via various recording media and communication lines. It is provided.

Block diagram showing the configuration of a two-dimensional code reader Diagram showing two-dimensional code Diagram showing component model Flow chart showing information identification processing

Embodiments of the present invention will be described below with reference to the drawings.
(1) Overall Configuration As shown in FIG. 1, the two-dimensional code reader 1 includes a control unit 10 that controls the entire two-dimensional code reader 1, a display unit 20 that displays various information, and an operation unit 30 that receives operations from the user. And a media drive 40 capable of inputting data from the outside of the two-dimensional code reader 1 via a medium, a camera 50 capable of acquiring image data indicating an image, and the like.

The two-dimensional code reader 1 is configured to be mounted on, for example, a mobile phone terminal, a portable information terminal, a known personal computer, or the like.
(2) Two-dimensional code Here, the two-dimensional code 100 read by the two-dimensional code reader 1 will be described.

  As shown in FIG. 2, the two-dimensional code 100 has a configuration in which cells C <b> 11 to Cmn are arranged in m × n (1 ≦ m, 1 ≦ n) on a black separator 110. Each cell C is arranged in a state where a certain gap is provided.

  In this two-dimensional code 100, when cells arranged in m × n are divided into cell groups each composed of one or more cells, each cell group has a plurality of colors (hereinafter “ Among the color combinations (hereinafter referred to as “information colors”) or color combinations (hereinafter referred to as “combination colors”), marks are given by information colors or combination colors associated with information to be indicated in the cell group. In the present embodiment, the cell C is filled with the corresponding color, and the cell C is set as a region of the corresponding color, thereby marking the cell C.

  In addition, among the cells C in each row, the cells C11 to Cm1 located at the head (the left end in the figure, the same applies hereinafter) are assigned as specific cells for specifying the position of the two-dimensional code 100. A pattern for specifying the position and orientation of the two-dimensional code 100 is formed by the color attached to the specific cell and the separator 110.

  As shown in FIG. 3, the colors of the marks assigned to the cells C are respectively three-dimensional areas in a three-dimensional space representing the distribution of cyan (C), magenta (M), and yellow (Y). A plurality of component areas (“9” in the present embodiment) extending in a spherical shape are determined by a component model in which these component areas are arranged in such a size and positional relationship that they do not interfere with each other. Specifically, each of the components represented by the center coordinates in the component area arranged in the component model is marked in the cell group as an information color component or a component of each color in the combination color.

  Here, `` component areas do not interfere with each other '' means that the component areas are spaced apart from each other so that the component areas do not overlap, or the boundaries of the component areas are adjacent to each other, It is to be.

  The size of the component area is defined as a space that can sufficiently include the range of errors that can occur depending on the shooting environment of the image. In this embodiment, the color at a specific coordinate is set under a general shooting environment. A region including a range of errors that can occur from this color according to the shooting environment is defined as a component region.

Further, the color of the mark attached to the specific cell in the two-dimensional code 100 and the color of the separator 110 include the color of the center coordinate in the component region not used for the color of the mark attached to the cell C (in this embodiment). The color of the component close to black is used.
(3) Information identification process Below, the process sequence of the information identification process performed by the two-dimensional code reader 1 (the control part 10) is demonstrated based on FIG. This information identification process is started when an operation for starting the information identification process is performed on the operation unit 30.

  First, image data is acquired (s110). Here, image data indicating an image captured by the camera 50, image data input from a medium via the media drive 40, image data generated by the control unit 10 itself, and the like are read into the built-in memory of the control unit 10. .

  Next, for the image data acquired in s110, it is checked whether or not the two-dimensional code 100 exists in the image indicated by the image data (s120). Here, first, a pattern search for specifying the position of the two-dimensional code 100 is performed from the image indicated by the image data acquired in s110. Then, it is determined that the two-dimensional code 100 exists when such a pattern, that is, a region including the specific cell and the separator 110 is detected.

When it is determined by the search by s120 that the two-dimensional code 100 does not exist (s120: NO), the information identification process is terminated.
On the other hand, when it is determined by the search by s120 that the two-dimensional code 100 exists (s120: YES), each image area of the two-dimensional code 100 is extracted from the image indicated by the image data (s130). Here, image areas having a pattern for specifying the position of the two-dimensional code 100 are extracted as image areas of the two-dimensional code 100 from the image indicated by the image data acquired in s110. Then, each image data composed of the image regions extracted in this way is generated.

  Next, it is checked whether there is an unprocessed image area among the areas of the two-dimensional code 100 extracted in s130 (s140). Here, it is checked whether or not there is an unprocessed image area in which the information group is not identified in the subsequent processing in the image area of the two-dimensional code 100 extracted in s130.

  If it is determined in s140 that an unprocessed image area exists (s140: YES), one of the unprocessed image areas is selected as a subsequent process target (s150). ).

  Next, the position of each cell C in the two-dimensional code 100 included in this image is specified from the image region selected in s150 (s160). Here, first, among the component regions arranged in the component model, the region in which the color is represented by the component in the component region allocated to the separator 110 and dividing each cell C in the two-dimensional code 100 is It is specified from the image area selected in s150. Subsequently, this region is regarded as the separator 110 in the two-dimensional code 100, and each region divided into the separator 110 is specified as the position of the cell C in the two-dimensional code 100. At this time, the region of the separator 110 is determined by the fact that the region in which the color is detected in the image region is a component distributed (positioned) in the component region corresponding to the separator 110.

  Next, the color of the mark attached to each cell C whose position is specified in s160 is specified (s170). Here, for each cell C whose position is specified in s160, it is determined in which component region the color component attached to this cell C is distributed in the component model. The color of the component represented by the specific coordinates in the component area thus determined is specified as the color of the mark attached to the cell C. At this time, the area of the cell C is determined by the fact that the area where the color is detected in the image area is a component distributed in any one of the component areas corresponding to the cell C.

  Next, based on the position of the cell C specified in s160 and the color of the cell C specified in s170, an information group corresponding to a cell group including one or more cells C in the two-dimensional code 100 is obtained. Is identified (s180). Here, based on the position of each cell C and the color of the mark, the color or combination of colors assigned to each cell group consisting of one or more cells C in the two-dimensional code 100 is specified, and thus the specified color or color Each piece of information corresponding to each combination is specified on the basis of a database in which a correspondence relationship between the color of each cell group or a combination of colors and information is registered. Thus, each specified information (information group) becomes an information group identified from the two-dimensional code 100 indicated by the image region extracted in s150.

  Thus, if recognition by s180 is performed, it will return to s140 and it repeats until it performs with respect to all the two-dimensional codes 100 extracted in s130 after that from s140.

If it is determined in s140 that there is no unprocessed image area, that is, if s140 to s160 are performed for all the two-dimensional codes 100 (s140: NO), each piece of information recognized in s180. After the group (message indicating that information is not recognized in s160) is displayed on the display unit 20 (s190), the information identification process is terminated. In s170, when a predetermined operation is performed on the operation unit 30 after the information group is displayed on the display unit 20, the information group is recorded on the medium set in the RAM 16 or the media drive 40. Is done.
(4) Operation and Effect In the two-dimensional code 100 in the above embodiment, each cell group is marked with an information color or a combination color associated with information to be shown in the cell group. Each of the marks C is attached with a color of a specific coordinate in a component area arranged in a positional relationship that does not interfere with each other in the component model representing the distribution of color components.

  In other words, the mark given to each cell C is attached to at least each cell C because the color component does not interfere with other cells C except for the cell C marked with the color of the same component region. If it is possible to identify the component color within which component area, it is marked with the color of the specific coordinate in the component area without specifying the color of the specific coordinate in the component area. Can be determined.

  This is because even if the cell C is in a state where the mark is attached with a color different from the original color depending on the shooting environment of the image representing the two-dimensional code 100, the mark color is within the component area. This means that the color can be specified as the color of a specific coordinate, that is, the original color.

  In this way, even if the color is different from the original color depending on the shooting environment, the influence can be suppressed by the component region, and therefore the control unit 10 side can appropriately determine the color of the mark in each cell C, and the result Thus, it is possible to prevent the information represented by the cell group from being erroneously identified.

  In the above embodiment, the original color is the center of the component region even in the cell C that is marked with a color different from the original color depending on the shooting environment of the image representing the two-dimensional code 100. Since it is a coordinate, the color given as a mark is difficult to protrude outside the component area, and it is highly possible that the color can be specified on the control unit 10 side as a color of a specific coordinate, that is, an original color.

In the above embodiment, since the separator is formed with the color of the component region different from the color of the mark attached to the cell C in the two-dimensional code 100, the control unit 10 side has the two-dimensional code 100. Even if it is a separator that is formed in a color different from the original color depending on the shooting environment of the image that represents the color, if that color is within the component area, that color will be used as the original color, that is, as a reliable separator Can be identified.
(5) Modifications Embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can take various forms as long as they belong to the technical scope of the present invention. Needless to say.

  For example, in the above-described embodiment, the cell C in the two-dimensional code 100 is configured as a corresponding color area, thereby realizing a state in which the cell C is marked. However, in order to mark the cell C, for example, a specific symbol is recorded in each cell, a specific figure (for example, various figures such as a circle and a polygon) is recorded, and the like. Also good.

  Moreover, in the said embodiment, the case where a component model was three-dimensional space was illustrated. However, as long as this component model represents the distribution of color components in a multidimensional space, the space may be a space other than three-dimensional.

  In the above embodiment, the component regions arranged in the component model need only be defined by the number of colors to be used in the two-dimensional code 100. If the respective component regions can be arranged in regions that do not interfere with each other, The specific number is not particularly limited.

  In the above embodiment, the component model is configured in the CMY color space. However, the color space of the component model can adopt a color space other than CMY as long as it represents a color component in a three-dimensional space. Needless to say.

In addition, all the separators 110 of the two-dimensional code 100 in the above embodiment have the same color, but the separators 110 are predetermined according to the color of the mark attached to each cell C adjacent in the same direction. It may be a different color. In this case, when the position of the cell C is specified in s160 of FIG. 4, after the color of the cell C, which is a process of scanning the image region along a certain direction, is specified, the color of the separator 110 corresponding to this color is changed. What is necessary is just to comprise so that it may determine with having detected that the area | region of the cell C which specified the previous color was complete | finished and it reached | attained the area | region of the separator 110. In this case, since it is not necessary to align the colors of the separators 110 to the same color, the degree of freedom in color is increased, and the design as the two-dimensional code 100 can be further improved.
(6) Correspondence with the Present Invention In the embodiment described above, s110 in FIG. 4 is an image acquisition means in the present invention, s160 and s170 in FIG. 4 are cell specifying means in the present invention, and s180 in FIG. It is the information acquisition means in invention.

  DESCRIPTION OF SYMBOLS 1 ... Two-dimensional code reader, 10 ... Control part, 20 ... Display part, 30 ... Operation part, 40 ... Media drive, 50 ... Camera, 100 ... Two-dimensional code, 110 ... Separator, C ... Cell.

Claims (7)

a two-dimensional code in which cells are arranged in m × n (1 ≦ m, 1 ≦ n),
In the case where the cells arranged in m × n are divided into cell groups each composed of one or more cells, each cell group has a plurality of colors associated with different information (hereinafter referred to as “information colors”) or Of the color combinations (hereinafter referred to as “combination colors”), the information color or the combination color associated with the information to be indicated in the cell group is marked,
In a multidimensional space that represents the distribution of color components, when a component model in which a plurality of component areas that are spread as multidimensional areas are arranged in a positional relationship that does not interfere with each other is arranged in the component model The cell group is marked with each component represented by specific coordinates in the component region as the information color component or the component color component in the combination color. code. In the component model, each of the component regions extending around the specific coordinate is arranged, and the component coordinate in the plurality of information colors or the component of each color in the plurality of combination colors is represented by the central coordinate in the component region. Each of the represented components is used. The two-dimensional code according to claim 1. Each of the cells arranged in m × n is separated by a separator with a predetermined color,
Each of the components represented by specific coordinates in the component area arranged in the component model includes a plurality of components in the information color or a component of each color in the plurality of combination colors, and a color attached to the separator The two-dimensional code according to claim 1, wherein the two-dimensional code is used as a component of A two-dimensional code reader for identifying information by reading a two-dimensional code in which cells are arranged in m × n (1 ≦ m, 1 ≦ n),
Image acquisition means for acquiring an image indicating the two-dimensional code;
Cell specifying means for specifying the color of each mark attached to each cell in the two-dimensional code indicated by the image from the image acquired by the image acquiring means;
Each piece of information corresponding to a color or a combination of colors assigned to a cell group consisting of one or more cells in the two-dimensional code based on the color of the cell specified by the cell specifying means consists of one or more cells. The correspondence between the color of the cell group or the combination of colors and the information is specified based on the registered database, and each of the specified information is identified from the two-dimensional code indicated by the image acquired by the image acquisition means. And an information acquisition means for acquiring as an information group,
In the multidimensional space representing the distribution of the color components, when the component model in which a plurality of component areas each expanding as a multidimensional area are arranged in a positional relationship where the component areas do not interfere with each other is defined, the cell specifying means For each cell in the two-dimensional code, it is determined whether the component of the color attached to the cell is distributed in which component region arranged in the component model, and the determination is made A two-dimensional code reader, characterized in that a color of a component represented by specific coordinates in a component area is specified as a color attached to the cell. In the case where the component model is one in which each of the component regions extending around the specific coordinates is arranged,
The cell specifying means is such that, for each cell at each position in the two-dimensional code, the color component attached to the cell is distributed in any of the component regions arranged in the component model. 5. The two-dimensional code reader according to claim 4, wherein the color of the component represented by the center coordinates in the determined component region is specified as a color attached to the cell. The cell specifying means, among the component areas arranged in the component model, an area having a color represented by a component in the component area allocated to a separator and separating each cell in the two-dimensional code, Identify from the image area of the image acquired by the image acquisition means, regard the specified area as a separator in the two-dimensional code, and specify each of the areas divided by the separator as the cell position in the two-dimensional code The two-dimensional code reader according to claim 4 or 5, wherein:   The program for functioning a computer as all the means with which the two-dimensional code reader as described in any one of Claims 4-6 is provided.

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