JP4247190B2 - Two-dimensional code recognition device and program - Google Patents

Description

  The present invention relates to a two-dimensional code identification device for recognizing a two-dimensional code displayed on a card on which an opinion is described and a program therefor, for example, in a system that supports meetings and workshops employing the opinion aggregation method.

  The KJ method is known as one of the opinion gathering methods used in meetings and workshops. The KJ method writes ideas and opinions from brainstorming, etc., and miscellaneous information collected from various survey sites one by one on a small card (out of paper), and those with similar contents from each other In the work of collecting and grouping, we try to generate hints and inspirations that help solve the theme.

  The basic procedure of the KJ method is shown below. First, participants write data such as ideas and collected information on a small card one by one. Next, the created cards are arranged on a desk or the like, and a group is created by collecting cards whose contents written on the cards are similar. In addition, a nameplate summarizing the contents is attached to each created group. In the card group organization, first, a small group is created, then a small group is created as a middle group, and then a middle group is created as a large group. When the KJ method is used in this way, it is possible to collect various opinions while repeating the grouping of cards and derive hints useful for the theme solution.

  By the way, recently, in meetings and workshops using the KJ method, an attempt has been made to record the process of collecting opinions and to reuse the recorded information for a virtual meeting or the like later. As a process recording method, for example, a video camera is used to capture an image of a card grouping process, and a movement history of each card is detected and recorded from the captured image data. At that time, a code for identifying the card is printed on each card, and the movement history of each card is detected by performing image processing on the captured image data and recognizing the code. Yes. As the code, a general-purpose one-dimensional bar code or a two-dimensional code such as a QR code having information in the horizontal and vertical directions is used (for example, see Non-Patent Document 1).

http://www.keyence.co.jp/barcode/2jigenbasic/chishiki4.html

  However, in meetings and workshops using the KJ method, the orientation of each card placed on the desk or wall varies, and this orientation changes each time the card is moved. For this reason, in a conventional system using an existing barcode, the barcode may not be recognized correctly depending on the card orientation. For accurate recognition, for example, it may be possible to perform barcode recognition processing after correcting the inclination of image data according to the card orientation. Another problem is that it requires a complex algorithm and a lot of processing time.

  The present invention has been made paying attention to the above circumstances, and its purpose is to enable stable code recognition processing without using a complicated image processing algorithm even if the orientation of the display medium changes, In particular, it is an object of the present invention to provide a two-dimensional code recognition apparatus suitable for use in the recording process of an opinion aggregation process and a program thereof.

In order to achieve the above object, a two-dimensional code recognition apparatus and a program therefor according to the present invention include a code data description part in which a plurality of cells are two-dimensionally arranged, and a position detection pattern part indicating the position of the code data description part. When recognizing the two-dimensional code by performing image processing on the medium image data obtained by imaging the two-dimensional code provided and the scale information defining the scale reference of the two-dimensional code. ,
First, the scale information is detected from the medium image data, and the scale reference value of the two-dimensional code is calculated based on the detected scale information. Then, template information whose size is adjusted based on the calculated scale reference value is generated, and the position detection pattern portion is detected from the medium image data based on the generated template information. . Next, an existence range of the code data description portion is estimated based on a detection position of the position detection pattern portion in the medium image data, and the code data is calculated from the estimated existence range in the medium image data. The description part is detected, and the code data described in the detected code data description part is decoded.

  Therefore, according to the present invention, the position detection pattern portion indicating the position of the code data description portion is first detected, and the code data description portion is recognized using the detected position detection pattern portion. For this reason, when recognizing a two-dimensional code by image processing from image data including a two-dimensional code, even if the direction of the two-dimensional code is rotated in an arbitrary direction, the image data is not subjected to inclination correction or the like. The code data description part can be detected with high probability, and the code data can be decoded. Therefore, a two-dimensional code can be recognized easily and efficiently in a short time without using a complicated image processing algorithm.

  In addition, prior to the detection of the position detection pattern portion, scale information is detected from the medium image data, and a scale reference value of the two-dimensional code is calculated based on this. Then, template information whose size is adjusted based on the calculated scale reference value is generated, and the position detection pattern portion is detected based on the generated template information. For this reason, it becomes possible to detect the position detection pattern portion quickly and reliably.

Further, the present invention provides the position detection pattern portion when estimating the existence range of the code data description portion when the position detection pattern portion has a direction indicating pattern that represents the existence direction of the code data description portion by a shape. The existence range of the code data description part is estimated based on the detected position of the code and the shape of the direction indicating pattern.
Therefore, when the position detection pattern portion is detected, the existence range of the code data description portion is estimated based on the shape of the direction indicating pattern. For this reason, for example, even if a pattern for position detection such as a QR code is provided, the position where the code data description portion is present can be estimated easily and quickly compared to a pattern having no direction indicating function.

Further, according to the present invention, when the position detection pattern is set to a unique color, the position detection pattern portion is detected from the medium image data based on the unique color when detecting the position detection pattern portion. It is characterized by doing.
In this way, even when the medium image data includes an image pattern having a shape similar to the position detection pattern, the position detection pattern can be detected more accurately by considering the color.

Furthermore, according to the present invention, when the code data description part includes a check pattern indicating the validity of the two-dimensional code, when decoding the code data, first, the validity of the two-dimensional code is determined based on the check pattern. . If the validity of the two-dimensional code is confirmed as a result of the determination of the validity, the code data described in the code data description section is decoded.
In this way, for example, when an image pattern similar to the code data description portion exists in the medium image data due to the influence of image noise or the like, it can be prevented from being erroneously recognized as an immediate code data description portion.

Furthermore, the present invention provides a method for decoding code data when the code data is expressed by setting a plurality of cells in which the code data description section is two-dimensionally arranged to one of the first and second colors. In addition, the code data is decoded by determining the color of each cell in the code data description section.
In this way, it is not necessary to identify the code width with high accuracy unlike a one-dimensional barcode, and the code can be accurately recognized by a relatively simple image recognition process.

  As described above, according to the present invention, when the two-dimensional code is found and decoded, the position detection pattern portion is first detected, and the code data description portion of the code data description portion is detected based on the detected position detection pattern portion. By estimating the existence range and detecting the code data description part from this estimated range and decoding it, even if the orientation of the display medium changes, it is stable without using complex image processing algorithms A code recognition process can be performed, and a two-dimensional code recognition apparatus suitable for use in the recording process of an opinion aggregation process and a program thereof can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a conference support system which is one of uses of a two-dimensional code according to the present invention. In this system, a board imaging device VI and a card imaging device CA are connected to a server device SV via a signal cable, and user terminals PC1 to PCk can be connected to the server device SV via a communication network NW. It is. The communication network NW is configured by, for example, the Internet or a LAN (Local Area Network).

  The server device SV has a function as a conference information management device. The server device SV has a function of taking in video data captured by the board imaging device VI via a cable and image data captured by the card imaging device CA. And a function of capturing via a cable.

  The user terminals PC1 to PCk are configured by a personal computer and include a display device and input devices such as a keyboard and a mouse. These user terminals PC1 to PCk communicate with the server device SV via the communication network NW, and are used to view the conference information distributed by the user who is the conference viewer in a virtual environment.

  FIG. 2 is a diagram showing how conference information is recorded in the system shown in FIG. In the figure, a board 1 is provided on a desk or a wall, and an opinion collecting process by the KJ method or the like is executed on the board 1. In this process, for example, cards 21 to 2i on which opinions are entered are placed on the board 1, and these cards 21 to 2i are manually moved on the board 1 by the participants so that the entered opinions are close to each other. This is done by forming a group between each other. The board 1 may be a commercially available white board, imitation paper, or the like, or may use the wall or desk of the venue as it is.

  The cards 21 to 2i are provided with an opinion entry area and a card identification area. The opinion entry area is an area where conference participants write their opinions using a pen or the like. A two-dimensional code is displayed in the card identification area. The two-dimensional code includes individual identification information unique to each card (hereinafter referred to as a card ID), and is printed on the card in advance. The cards 21 to 2i are not limited in shape and material as long as opinions can be entered using a writing instrument such as a pen. For example, commercially available sticky notes with an adhesive can be used.

  The board imaging device VI is composed of, for example, a video camera capable of capturing moving images, and images the entire board 1 on which opinions are aggregated over time. Then, the board video data and digital audio data obtained by this imaging are sent to the server device SV via a DV cable, for example.

  FIG. 3 shows an example of board video data. The board image data includes image data of a plurality of cards 21 to 2i arranged on the board 1 and a scale square image SS described later. The image data of each of the cards 21 to 2i includes a two-dimensional code for identifying the card image, and the scale square image SS is used for recognizing the two-dimensional code. The scale square image used in the board image data is composed of a square image having one side in the long side direction of the two-dimensional code.

  The card imaging device CA is constituted by a digital still camera, for example, and images the cards 21 to 2i one by one. Then, the card image data obtained by this imaging is sent to the server device SV via, for example, a USB cable. The card image data includes an image representing an opinion or the like written on one card, a two-dimensional code for identifying the card, and a scale square image used for recognition of the two-dimensional code. The scale square image used in the card video data is composed of a square image having one side of the length in the short side direction of the two-dimensional code.

  The server device SV also has a function as a two-dimensional code recognition device. That is, the server device SV stores the board image data sent from the board imaging device VI and the card image data sent from the card imaging device CA. Then, the stored card image data is read, and the two-dimensional code displayed in the card identification area is recognized by the image recognition process, and the card ID is decoded.

  Next, the server apparatus SV compares the board video data and the card ID included in the card image data, and detects the position of the card on the board video data if they match. Then, the detected position information of the card is stored in the memory included in the server device SV as movement history information. The conference information data is reconstructed from the card movement history information and the card image data stored in this manner, and distributed to the user terminals PC1 to PCk.

By the way, the two-dimensional code displayed in the card identification areas of the cards 21 to 2i is configured as follows. FIG. 4 shows the configuration.
That is, the two-dimensional code includes a data description part DT in which a plurality of cells are two-dimensionally arranged, and cutout symbol parts SS and SE arranged at both ends thereof. The data description part DT is a two-dimensional array of a plurality of square cells, and is divided into a check pattern area and a data area. As shown in FIG. 5, a predetermined check pattern CP is inserted into the check pattern area. The check pattern CP is used to determine the correctness when recognizing a two-dimensional code. A card ID is inserted into the data area. For example, each cell is assigned to each bit of the code data constituting the card ID, and is set to white or black according to the bit value.

  The cut-out symbol portions SS and SE are used to find the position of the data description portion DT on the cards 21 to 2i when recognizing the two-dimensional code, and a direction indication pattern indicating the existence direction of the data description portion DT is used. Form. For example, as shown in FIG. 4, the direction indicating pattern is formed by combining a pattern shape of “reverse U type” and “U type”. Note that the pattern shape of the direction indicating pattern of the cutout symbol portions SS and SE is not limited to “reverse U type” and “U type”, but a combination of “<type” and “> type” Any combination of shapes can be used as long as it indicates the direction in which the data description part DT exists, such as a combination of “→” and “←”. The direction indicating pattern may be colored with a unique color. As this unique color, a color that is not used in the card in the conference support system is selected.

Now, an apparatus for recognizing the two-dimensional code is configured as follows. FIG. 5 is a block diagram showing a functional configuration of the server apparatus SV having a two-dimensional code recognition function.
That is, the server apparatus SV includes a central processing unit (CPU) 11 such as a microprocessor. The CPU 11 is connected to a data memory 13, a program memory 14, and a data memory 14 via a bus 12, and further has a camera input interface (camera input I / F) 15, a video input I / F 16, and a creation device input I / F 17. And an output interface (output I / F) 18 is connected.

  The camera input I / F 15 captures card image data sent from the card imaging apparatus CA via a cable under the control of the CPU 11. The video input I / F 16 takes in board image data sent from the board imaging device VI via a cable under the control of the CPU 11. The card image data and board image data can also be read from an external storage medium such as a magnetic disk, an optical disk, or a memory card.

  A code creation device AS is connected to the creation device input I / F 17 via a cable. The code creation device AS creates a two-dimensional code to be displayed on each of the card cards 21 to 2i, and outputs symbol template information and code attribute data corresponding to the created two-dimensional code. The creation device input I / F 17 takes in the symbol template information and code attribute data output from the code creation device AS. A display 19 is connected to the output I / F 18. The output I / F 18 displays a two-dimensional code decoding result on the display 19 under the control of the CPU 11.

  The data memory 14 includes a hard disk and a flash memory, and includes a search image storage area 14a, a symbol template information storage area 14b, and a code attribute data storage area 14c. In the search image storage area 14a, card image data captured via the camera input I / F 15 and board image data captured via the video input I / F 16 are stored.

  The symbol template information storage area 14b stores the symbol template information captured via the creation device input I / F 17. Similarly, the code attribute data storage area 14c stores the code attribute data fetched via the creation device input I / F 17.

  In the program memory 13, as application programs for realizing the present invention, a search image input control program 13a, a scale square recognition program 13b, a template size control program 13c, a cut-out symbol search program 13d, and a data description A range specifying program 13e, a check bit analysis program 13f, and a code data decoding program 13g are stored.

  The search image input control program 13a fetches the card image data sent from the card imaging device CA and the board image data sent from the board imaging device VI via the camera input I / F 15 and the video input I / F 16, respectively. Each image data is stored in the search image storage area 14a.

  The scale square recognition program 13b recognizes the scale square image data SS from the board image data and card image data that are search target images. At this time, as the square for scale, there are a first square image whose one side is the length in the long side direction of the two-dimensional code and a second square image whose one side is the length in the short side direction of the two-dimensional code. The first square image is recognized from the board image data, and the second square image is recognized from the card image data. As a scaling square recognition method, feature extraction (blob analysis), which is one of image processing techniques, is used, and square features are extracted. Further, the scale square recognition program 13b calculates the length of one side of the extracted first and second squares. The length of one side of the square is calculated from the coordinates of the apex of the square using the three-square theorem.

  The template size control program 13c reads the symbol template information from the symbol template information storage area 14b, and sets the size of the symbol template information based on the length of one side of the square calculated by the scale square recognition program 13b. adjust.

  The cutout symbol search program 13d searches the cutout symbol portions SS and SE of the two-dimensional code from the board image data or card image data stored in the search image storage area 14a, and uses the size-adjusted symbol template. The cutout symbol portions SS and SE are detected by the pattern matching.

  The data description range specifying program 13e uses a two-dimensional code data description part DT based on the position coordinates of the cutout symbol parts SS and SE detected by the cutout symbol search program 13d and the pattern shape of the direction indicating pattern. Estimate the existing range. And the candidate of the data description part DT is extracted from this estimated range.

  The check bit analysis program 13f determines the validity of the candidates for the data description part DT extracted by the data description range specifying program 13e based on the check pattern CP. The validity of the two-dimensional code is determined in order to avoid erroneous recognition of the two-dimensional code due to the influence of image noise or the like.

  The code data decoding program 13g decodes the white and black patterns described in each cell into binary code data for the data description part DT of the two-dimensional code whose validity has been confirmed by the check bit analysis program 13f. Further, this binary code data is converted into a decimal card ID.

Next, a two-dimensional code recognition processing operation in the server apparatus SV configured as described above will be described. FIG. 7 is a flowchart showing the control procedure and control contents.
When the capture of the card image data and the board image data is completed, the server apparatus SV reads out the image data to be searched for the two-dimensional code from the search image storage area 14a. Then, in this state, first, the scale square recognition program 13b is executed in step 7a, and the scale square image SS composed of squares is recognized from the read image data by using, for example, blob analysis.

  For example, the board image data recognizes a first square image whose one side is the length in the long side direction of the two-dimensional code, while the card image data has one side of the length in the short side direction of the two-dimensional code. The second square image is recognized. Then, the length of one side of the recognized scale square image SS is calculated using the square theorem from the coordinates of the vertexes of the square.

  Next, the CPU 11 of the server device SV executes the template size control program 13c in step 7b, and reads the symbol template information previously fetched from the code creation device AS from the symbol template information storage area 14b. In step 7c, based on the distance between symbols (a shown in FIG. 9) included in the read symbol template information and the length of one side of the scale square image SS calculated in step 7a. Adjust the size of the symbol template. This size adjustment is performed by multiplying the symbol shape and intersymbol distance included in the symbol template information by b / a. 9 and 10 show the state of the processing. With this size adjustment, the symbol template is set to the same size as the cut-out symbol portions SS and SE of the two-dimensional code existing in the search image data.

  Next, the CPU 11 executes the cut-out symbol search program 13d in step 7d, and searches the cut-out symbol portions SS and SE from the search target image data using the size-adjusted symbol template. This search process is performed by performing pattern matching between the symbol template and the search target image data.

  When the cutout symbol parts SS and SE are found in this way, the CPU 11 subsequently executes the data description range specifying program 13e in step 7e, based on the position coordinates of the cutout symbol parts SS and SE and the shape of the direction indication pattern. Then, the existence range of the data description part DT is estimated. For example, as shown in FIG. 11A, an area between the cutout symbol portions SS and SE and a range excluding the margin for one cell that touches each of the cutout symbol portions SS and SE is defined in the data description portion DT. Estimated as the existence range. This existence range is recognized as the data description part DT. Then, based on the size obtained by multiplying the size of one cell stored in the code attribute data storage area 14c by b / a, the estimated range is divided as shown in FIG. This divided small range is recognized as a two-dimensional code cell.

  Next, the CPU 11 executes the check bit analysis program 13f in step 7f, detects the check pattern CP, and determines the validity of the candidate data description part DT. For example, as shown in FIG. 11C, 2 × 2 4 cells at the left end of the data description part DT are extracted as the check pattern CP, and the monochrome pattern of the 4 cells is determined. Then, as shown in FIG. 11C, if only the upper left cell is black and the other three cells are white among the four cells, it is determined that the check pattern CP is correct, and the data description part searched by this is determined. The validity of DT candidates is guaranteed. Therefore, the recognition error of the two-dimensional code due to the influence of image noise or the like can be avoided in advance.

  When the validity of the two-dimensional code is confirmed in the determination of the check pattern CP, the CPU 11 proceeds from step 7g to step 7h. In step 7h, the code data decoding program 13g is executed. FIG. 8 is a flowchart showing the processing procedure and processing contents.

  That is, first, in step 8a, the CPU 11 specifies the data description range by excluding the check pattern CP from the extracted data description portion DT. Next, in step 8b, the lower right cell is selected as the cell corresponding to the lowest digit of the code data among the plurality of divided cells in the specified data description range, and this selected initial position is selected. Whether the cell is white or black is determined from the luminance value in step 8c.

  Subsequently, in step 8d, a cell adjacent to the left side of the selected cell is selected, and whether the selected cell is white or black is determined in step 8c. Thereafter, in the same manner, in step 8d, it is determined whether each cell is white or black in step 8c while sequentially moving the cell selection position from right to left, and further sequentially moving from the lower row to the upper row.

  When the white / black determination is completed for all the cells, the CPU 11 proceeds from step 8e to step 8f, where a binary code is generated based on the determination result of each cell. For example, white is converted to “0” and black is converted to “1”. The generated binary code is converted into a decimal code in step 8g, and the converted decimal code is stored in the data memory 14 as a card ID in step 8h. Finally, in step 7i, the CPU 11 outputs the stored card ID to the display 19 via the output I / F 18 for display.

  As described above, in this embodiment, when recognizing a two-dimensional code from search target image data, first, the scale square image SS is recognized from the search target image data and the length of one side thereof is recognized. Calculate Next, the size of the symbol template is adjusted using the calculated length of one side as a scale reference value, and the cut-out symbol portions SS and SE are extracted from the search target image data based on the size-adjusted symbol template. Recognize Then, the existence range of the data description part DT is estimated based on the recognized cutout symbol parts SS and SE, and the candidate image of the data description part included in the estimated existence range is validated by the check pattern CP. After determining the sex, the code data described in the data description part DT is decoded.

  Therefore, the cutout symbol portions SS and SE indicating the position of the data description portion DT are first detected, and the data description portion DT is recognized using the detected cutout symbol portions SS and SE. For this reason, when recognizing a two-dimensional code by image processing from image data including a two-dimensional code, even if the direction of the two-dimensional code is rotated in an arbitrary direction, the image data is not subjected to inclination correction or the like. The code data description part can be detected with high probability, and the code data can be decoded. Therefore, a two-dimensional code can be recognized easily and efficiently in a short time without using a complicated image processing algorithm.

  In addition, prior to the detection of the cutout symbol portions SS and SE, the scale square image SS is detected from the image data to be searched, and the scale reference value of the two-dimensional code is calculated based on the image SS. Then, a symbol template whose size is adjusted based on the calculated scale reference value is generated, and the cutout symbol portions SS and SE are detected based on the generated symbol template. For this reason, it becomes possible to detect the cutout symbol portions SS and SE quickly and reliably.

  Further, as the scale square image SS, a first square image having a length in the long side direction of the two-dimensional code as one side and a second square image having a length in the short side direction of the two-dimensional code as one side. When the two-dimensional code is recognized from the board image data, the first square image is used. On the other hand, when the two-dimensional code is recognized from the card image data, the second square image is used. Like to use. For this reason, even if the board image data contains a large number of two-dimensional codes in a small size, or the card image data contains only one relatively large size two-dimensional code. Can be recognized efficiently and accurately.

  Further, in this embodiment, the cutout symbol portions SS and SE are provided with direction indication patterns that indicate the existence direction of the data description portion DT by the shape, and the existence range of the code data description portion is estimated based on the shape of the direction indication pattern. Like to do. Therefore, for example, the position where the code data description portion is present can be estimated easily and quickly compared to a case where a pattern for position detection such as a QR code does not have a direction indicating function.

  Furthermore, if the cutout symbol portions SS and SE are set to unique colors, the cutout symbol portions SS and SE are recognized based on the unique colors when the cutout symbol portions SS and SE are detected. It is also possible. Therefore, even when an image pattern having a shape similar to the cutout symbol portions SS and SE is included in the search target image data, the cutout symbol portion SS is used by using the color as one of the determination conditions. , SE can be detected more accurately and quickly.

  Further, in this embodiment, the data description part DT includes a check pattern CP indicating the validity of the two-dimensional code, and when decoding the code data, first, the validity of the two-dimensional code is determined based on the check pattern CP. When the validity of the two-dimensional code is confirmed, the code data described in the data description part DT is decoded. Therefore, for example, when an image pattern similar to the data description part DT exists in the medium image data due to the influence of image noise or the like, it can be prevented from being erroneously recognized as the data description part, and the recognition rate is improved. Can be made.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the clipping symbol portions SS and SE are arranged on the left and right of the data description portion DT has been described as an example. However, the clipping symbol portions SS and SE are arranged above and below the data description portion DT. May be. In addition, the shape and specific color of the direction indicating pattern in the cutout symbol portion can be arbitrarily set. Further, the color of each cell in the data description section is not limited to white and black, and other color combinations such as white and blue, white and red, and the like can be used.

  In addition, the number and size of the cells constituting the data description part, the configuration of the two-dimensional array, the size and shape of the first and second position detection patterns, the arrangement position with respect to the data description part, the recognition procedure of the two-dimensional code and its The contents, the configuration of the square and symbol templates, and the recognition method thereof can be variously modified and implemented without departing from the gist of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The schematic block diagram which shows one Embodiment of the meeting assistance system which is one of the uses of the two-dimensional code concerning this invention. The figure which shows the mode of the recording of the meeting information in the system shown in FIG. The figure which shows the structure of the card | curd used with the system shown in FIG. The figure which shows the structure of the two-dimensional code concerning one Embodiment of this invention. The figure which shows an example of the check pattern set to the two-dimensional code shown in FIG. The functional block diagram which shows the structure of the server apparatus which is one Embodiment of the two-dimensional code recognition apparatus concerning this invention. The flowchart which shows the two-dimensional code recognition procedure and content by the server apparatus shown in FIG. The flowchart which shows the procedure and content of the data decoding process in the flowchart shown in FIG. The figure which shows an example of the square for a scale produced in a code production apparatus. The figure which shows an example of the square for a scale detected from the captured image data of a card | curd. The figure for demonstrating the decoding procedure of code data.

Explanation of symbols

  SV ... Server device, VI ... Board imaging device, CA ... Card imaging device, communication network ... NW, PC1-PCk ... User terminal, 1 ... Board, 21-2i ... Card, 21A ... Opinion entry area, 21B ... Two-dimensional code Entry area, AS ... two-dimensional code creation device, DT ... data description part, SS, SE ... slicing symbol part, SS ... scaling square, 11 ... CPU, 12 ... bus, 13 ... program memory, 13a ... search image input Control program, 13b ... Square recognition program for scale, 13c ... Template size control program, 13d ... Cutout symbol search program, 13e ... Data description range identification program, 13f ... Check bit analysis program, 13g ... Code data decoding program, 14 ... Data Memory, 14a ... Image storage area, 14b ... Symbol template information storage area, 14c ... Code attribute data storage area, 15 ... Camera input I / F, 16 ... Video input I / F, 17 ... Creation device input I / F, 18 ... Output I / F, 19 ... Display.

Claims (10)

A two-dimensional code having a code data description part in which a plurality of cells are two-dimensionally arranged and a position detection pattern part indicating the position of the code data description part, and scale information defining a scale reference of the two-dimensional code are respectively displayed. A two-dimensional code recognition device for recognizing the two-dimensional code by performing image processing on medium image data obtained by imaging the medium,
Means for detecting the scale information from the medium image data;
Means for calculating a scale reference value of the two-dimensional code based on the detected scale information;
Means for generating template information whose size is adjusted based on the calculated scale reference value;
Means for detecting the position detection pattern portion from the medium image data based on the generated template information;
Means for estimating the existence range of the code data description part based on the detection position of the position detection pattern part in the medium image data;
Means for detecting the code data description part from the estimated existence range in the medium image data;
And a means for decoding the code data described in the detected code data description section. When the position detection pattern portion has a direction indication pattern that represents the direction in which the code data description portion exists by a shape,
The means for estimating the existence range of the code data description portion estimates the existence range of the code data description portion based on the detection position of the position detection pattern portion and the shape of the direction indication pattern. The two-dimensional code recognition apparatus according to claim 1. When the position detection pattern is set to a unique color,
The means for detecting the position detection pattern portion detects the position detection pattern portion from the medium image data based on the template information having the adjusted size and the unique color. The two-dimensional code recognition apparatus according to claim 1. When the code data description part includes a check pattern representing the validity of the two-dimensional code,
The means for decoding the code data includes:
Means for determining the validity of the two-dimensional code based on the check pattern included in the detected code data description unit;
And a means for decoding code data described in the detected code data description section when the validity of the two-dimensional code is confirmed as a result of the determination of the validity. The two-dimensional code recognition apparatus described. When the code data description unit expresses code data by setting a plurality of two-dimensionally arranged cells to one of the first and second colors,
2. The two-dimensional code recognition apparatus according to claim 1, wherein the means for decoding the code data decodes the code data by determining the color of each cell of the detected code data description section. A two-dimensional code having a code data description part in which a plurality of cells are two-dimensionally arranged and a position detection pattern part indicating the position of the code data description part, and scale information defining a scale reference of the two-dimensional code are respectively displayed. A program used in a two-dimensional code recognition apparatus for recognizing the two-dimensional code by performing image processing on a medium image data obtained by imaging the medium thus obtained,
Processing for detecting the scale information from the medium image data;
Based on the detected scale information, a process of calculating a scale reference value of the two-dimensional code,
Processing to capture template information of the position detection pattern portion;
A process of adjusting the size of the template information based on the calculated scale reference value;
Processing for detecting the position detection pattern portion from the medium image data based on the template information having the adjusted size;
A process of estimating the existence range of the code data description part based on the detection position of the position detection pattern part in the medium image data;
Processing for detecting the code data description unit from the estimated existence range in the medium image data;
A program for causing the processor to execute a process of decoding the code data described in the detected code data description section. When the position detection pattern portion has a direction indication pattern that represents the direction in which the code data description portion exists by a shape,
The process of estimating the existence range of the code data description section estimates the existence range of the code data description section based on the detection position of the position detection pattern section and the shape of the direction indication pattern. The program according to claim 6. When the position detection pattern is set to a unique color,
The process of detecting the position detection pattern portion detects the position detection pattern portion from the medium image data based on the template information having the adjusted size and the unique color. The program according to claim 6. When the code data description part includes a check pattern representing the validity of the two-dimensional code,
The process of decoding the code data includes:
A process of determining the validity of the two-dimensional code based on the check pattern included in the detected code data description part;
When the validity of the two-dimensional code is confirmed as a result of the validity determination, the processor is caused to execute a process of decoding the code data described in the detected code data description unit. The program according to claim 6 . When the code data description unit expresses code data by setting a plurality of two-dimensionally arranged cells to one of the first and second colors,
The program according to claim 6 , wherein the process of decoding the code data decodes the code data by determining a color of each cell of the detected code data description part.

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