JP2009123088A - Data code reader and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a data code to be normally read even when a white smear portion and a dark image are generated in the image data of the data code. <P>SOLUTION: The device is equipped with an imaging device for iteratively imaging an area, including the data code, attached to a moving object and comprising, at least, a plurality of data blocks, a decoding part for decoding to each of, at least, the two image data acquired by iterative imaging by this imaging device, a decoding judging part for judging whether decoding result by the decoding part for each of the plurality of data blocks of at least two image data is allowed or not, and a decoding combination part for acquiring the final decoding result by combining the decoding data of each of the data blocks judged allowed to be decoded by this decoding judging part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a data code reading apparatus and method for reading at least a data code consisting of a plurality of data blocks attached to an object such as a commodity moved in front of a two-dimensional imaging apparatus, for example.

  There are data code recognition devices that read and recognize data codes such as two-dimensional bar codes, QR codes, and symbols. This data code recognition device images a data code such as a two-dimensional barcode, QR code, symbol, etc., for example, by an imaging device, and performs image processing on an image signal having a multi-value gray level output from the imaging device. In this image processing, preprocessing for binarizing an image signal having a multilevel gray level is performed, and various processes such as barcode decoding and pattern recognition are performed based on the binarized binary image data. Do.

In such a data code recognition device, when a data code such as a two-dimensional barcode, QR code, or symbol is imaged by an imaging device, illumination is performed in order to recognize these data codes with high accuracy. As a technique for performing this illumination, for example, there is Patent Document 1. This Patent Document 1 illuminates a substrate mark with direct light through a passage hole of a diffusion plate among lights output from a plurality of illumination light sources such as LEDs, and illuminates the substrate mark with diffuse light incident obliquely from the diffusion plate It is also disclosed that a plurality of illumination light sources are selectively turned on in accordance with the reflection characteristics of the substrate mark.
JP 2001-304817 A

  However, when an image pickup apparatus captures an image with a data code such as a two-dimensional bar code, QR code, or symbol illuminated, if the print surface on which the QR code is printed has specular reflection characteristics, a plurality of LEDs, etc. The portion of the light that is output from the illumination light source, reflected by the QR code printing surface, and incident on the imaging device is large. Thus, for example, as shown in FIG. 9, the image data acquired by the imaging device includes a portion in which the amount of reflected light increases in the QR code 1 corresponding to an illumination light source such as a plurality of LEDs, a so-called overexposed portion. A plurality of 2 may occur. For this reason, normal image data of QR code 1 cannot be acquired, and QR code 1 cannot be decoded. Even if the QR code 1 is illuminated, for example, illumination unevenness occurs as shown in FIG. 10, and the dark and dark image portion 3 may be generated in which the gray level at the corner of the QR code 1 is lower than other portions. Even in this case, normal image data of QR code 1 cannot be acquired, and QR code 1 cannot be decoded.

  An object of the present invention is to provide a data code reading apparatus and method that can normally read a data code even if an overexposed portion or a dark image occurs in image data of the data code.

  A data code reading device according to a main aspect of the present invention includes an imaging device that is attached to a moving object and that images at least a region including at least a data code composed of a plurality of data blocks, and images the imaging device. A decoding unit that performs decoding for each of a plurality of data blocks with respect to each of at least two image data acquired by the above, and whether or not the decoding result by the decoding unit for each of a plurality of data blocks of at least two image data is enabled / disabled A decoding determining unit for determining, and a decoding combining unit for acquiring the final decoding result by combining the decoding data of each data block determined to be decodable by the decoding determining unit.

  According to another aspect of the present invention, there is provided a data code reading method, wherein a region attached to a moving object and including at least a data code composed of a plurality of data blocks is imaged at least twice and acquired by this imaging. Each of the at least two image data is decoded for each of a plurality of data blocks, and each of the plurality of data blocks of the at least two image data is determined as to whether or not the decoding result is possible. The decoding result of each data block determined to be decodable is combined to obtain the final decoding result.

  According to the present invention, it is possible to provide a data code reading apparatus and method that can normally read a data code even if an overexposed portion or a dark image is generated in the image data of the data code.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration diagram of a data code reader. This data code reader is used for an electronic cash register, for example. This data code reader is equipped with a CPU (Central Processing Unit) 10 as a control unit main body. The CPU 10 is connected to a ROM (Lead Only Memory) 11, a RAM (Random Access Memory) 12, a communication interface (communication I / F) 13, and an imaging device 14, and receives a command from the CPU 10. A binarization processing unit 15, a decoding unit 16, a decoding determination unit 17, a decoding combination unit 18, and a lighting unit 19 are included.

  In the ROM 12, for example, a business program and a data code reading program for executing the business of the electronic cash register are stored in advance. The data code reading program causes at least two multi-tone image data to be obtained by repeatedly capturing an area including QR code 1 printed on a label affixed to the product 20 as a data code by the imaging device 14 at least twice. The decoding unit 16 decodes each of the multi-gradation image data for each of the plurality of data blocks, and the decoding determination unit 17 determines whether the decoding result is possible for each data block. The decoding combination unit 18 combines the decoded data of each data block determined to be decodable by the determination of the decoding result, and obtains the final decoding result.

The RAM 12 is formed with an area for temporarily storing various data. For example, the multi-gradation image data acquired by imaging of the imaging device 14 is temporarily stored in the area, or the QR code decoded by the decoding unit 16 is stored. The information included in 1 is temporarily stored in the same area.
An external device is connected to the communication I / F 13 through a transmission path (not shown). The communication I / F 13 performs data communication between external devices through a transmission path.
The imaging device 14 images an area including the QR code 1 on the label attached to the product 20 and outputs a multi-gradation image signal. For example, an image sensor including a CCD or the like is used. When the product 20 moves once within the imaging range of the imaging device 14 by an operator's operation, for example, when the imaging device 14 is repeatedly performing imaging operations at predetermined intervals, the imaging device 14 The imaging operation for QR code 1 is performed at least twice. Note that the number of imaging operations performed while the product 20 moves once across the imaging range of the imaging device 14 is the moving speed of the product 20 that is moved by an operator's operation and the repetition period of the imaging operation by the imaging device 14. For example, it may be performed twice or more.

The binarization processing unit 15 binarizes the multi-tone image signal output from the imaging device 14 using a threshold value, and acquires the binarized image data.
The decoding unit 16 performs decoding for each of a plurality of data blocks in the QR code 1 from the binarized image data acquired by the binarization processing unit 16. That is, the QR code 1 has a plurality of data blocks, for example, data blocks b _{1 to} b ₇ as shown in the schematic diagram of FIG. Thereby, the decoding unit 16 performs decoding for each of the data blocks b _{1 to} b ₇ in the QR code 1. The QR code 1 also has an error correction block in which a checksum for checking is encoded.

The decoding determination unit 17 determines whether each decoding result for each data block b _{1 to} b ₇ in the QR code 1 by the decoding unit 16 is acceptable or not. If the decoding result is acceptable, it indicates that each decoding of each data block b _{1 to} b ₇ in the QR code 1 has been normally performed. If the decoding result is not possible, it indicates that the decoding for each of the data blocks b _{1 to} b ₇ in the QR code 1 is not normally performed and the decoding data is missing.

The decode combination unit 18 combines the decode data of the data blocks b _{1 to} b ₇ determined to be decodable by the decode determination unit 17 and acquires the final decoding result. That is, at least two pieces of multi-tone image data including the QR code 1 are acquired when the product 20 moves once across the imaging range of the imaging device 14. Decoding for each of the data blocks b _{1 to} b ₇ in the QR code 1 is performed with at least two multi-gradations acquired when the product 20 moves once across the imaging range of the imaging device 14. This is performed for each image data. Therefore, the decoding combination unit 18 determines each data block b ₁ to b determined as being decodable among the results of decoding for each data block b _{1 to} b ₇ performed for each of at least two multi-gradation image data. ₇ to obtain the final decoding result.

Specifically, the decoding combination unit 18 obtains at least one data block, for example, a data block, as a result of decoding for each of the data blocks b _{1 to} b ₇ for the multi-tone image data acquired by the first imaging by the imaging device 14. if the determination result of the decoding not to b _2, decodes the decoded data missing data block b ₂ of the decoding impossible, for each image data of the multi-gradation obtained by the imaging of the second and subsequent from the imaging device 14 The result is rewritten to the decoded data of the data block b _{2 that} is the same as the data block b ₂ determined to be undecodable and determined to be decodable.

In this case, the decoding combination unit 18 decodes each data block b _{1 to} b _{7 to} at least one data block b ₂ as a result of decoding the multi-tone image data acquired by the first imaging by the imaging device 14. If the determination result indicates that the data block cannot be decoded, the decoded data of each of the data blocks b _{1 to} b ₇ including the data block b ₂ that cannot be decoded is stored in the RAM 12, for example. Then, after the second imaging by the imaging device 14, the decoding combination unit 18 is a data block that is determined to be able to decode the decoding data that cannot be decoded among the decoding data of the data blocks b _{1 to} b ₇ stored in the RAM 12. It rewrites the decoded data of b _2.

The decoding combination unit 18 performs decoding on each of the data blocks b _{1 to} b ₇ by the decoding unit 16 with respect to the multi-tone image data acquired by the first imaging by the imaging device 14, and as a result, all the data blocks If b _{1 to} b ₇ are determination results that can be decoded, the decoded data of the respective data blocks b _{1 to} b ₇ is set as the final decoding result.

  The lighting unit 19 lights a plurality of light sources, for example, LEDs 21-1 to 21-n. These LEDs 21-1 to 21-n illuminate the product 20 to be moved within the imaging range of the imaging device 14 by an operator's operation, for example.

Next, a data code reading operation by the apparatus configured as described above will be described with reference to a data code reading flowchart shown in FIG.
The imaging device 14 performs an imaging operation every predetermined period and outputs the multi-gradation image signal. In step # 1, the CPU 10 inputs a multi-tone image signal output from the imaging device 14 at predetermined intervals, and sends the multi-tone image signal to the binarization processing unit 15. The binarization processing unit 15 binarizes the multi-gradation image signal acquired by the imaging device 14 using a threshold value, and acquires the binarized image data. Note that during the imaging operation of the imaging device 14, the lighting unit 19 lights, for example, the LEDs 21-1 to 21-n.

  Next, in step # 2, the CPU 10 detects the QR code 1 based on the binarized image data acquired by the binarization processing unit 15. If the QR code 1 is not detected as a result of this detection, the CPU 10 returns to step # 1.

  On the other hand, when the product 20 is moved once within the imaging range of the imaging device 14 by an operator's operation, for example, when the imaging device 14 repeatedly performs imaging operations at predetermined intervals, the imaging device 14 The region including the QR code 1 on the label attached to the product 20 is imaged, and the multi-tone image signal is output. At this time, the number of imaging operations of the imaging device 14 with respect to the QR code 1 performed while the product 20 moves once within the imaging range of the imaging device 14 depends on the moving speed of the product 20 that is moved by the operation of the operator and the imaging device. 14 is determined based on the repetition period of the imaging operation according to 14, and for example, the imaging operation is performed twice. Also at this time, the lighting unit 19 lights the LEDs 21-1 to 21-n, for example. Thereby, the QR code 1 on the product 20 moved by the operator's operation and the label attached to the product 29 is illuminated by the illumination light output from the LEDs 21-1 to 21-n.

However, at the time of the first imaging operation, the CPU 10 inputs a multi-tone image signal output from the imaging device 14 and sends the multi-tone image signal to the binarization processing unit 15 in step # 1. . The binarization processing section 15 binarizes using a threshold respectively multi-gradation image signal obtained by the imaging of the imaging device 14, and acquires the binarized image data D _1. Figure 4 shows a schematic view of the obtained binarized image data D ₁ by the imaging operation of the first. The binary image data _{D 1,} as well as showing the image of QR code 1, are not actually imaged is positioned between the QR code 1 and a plurality of LED21-1~21-n for example, each LED21-1~21-6 The LEDs 21-1 to 21-6 are also shown for easy understanding of the relationship.

Then, CPU 10 at step # 2, detects the QR code 1 on the basis of the 2 obtained by the binarization processing section 15 binarizes the image data _{D 1.} Next, the CPU 10 proceeds to step # 4, and performs error detection and correction processing using each check described for each error correction block in the QR code 1.

Next, the decoding unit 16 includes a plurality of data blocks b _{1 to} b ₇ shown in FIG. 2 in the QR code 1 from the binarized image data D ₁ acquired by the binarization processing unit 16 in step # 5, for example. Decode each time. FIG. 5 shows a decoding result for each of the data blocks b _{1 to} b ₇ . The decoding result is, for example, that the data blocks b ₁ , b ₃ , b _{5 to} b ₇ can be decoded (OK), but the data blocks b ₂ and b ₄ cannot be decoded (NG).

Next, in step # 6, the decoding determination unit 17 determines whether each decoding result for each data block b _{1 to} b ₇ in the QR code 1 as shown in FIG. That is, if the decoding result is acceptable, the decoding determination unit 17 determines that each decoding of each data block b ₁ , b ₃ , b _{5 to} b _{7 in} the QR code 1 is normally performed, and decodes If the result is not possible, it is determined that the decoding for each data block b ₂ and b ₄ in the QR code 1 is not normally performed and the decoded data is missing. However, since the determination results of all the data blocks b _{1 to} b ₇ are not decodable, the decode determination unit 17 sends this fact to the CPU 10. When the CPU 10 receives that the determination results of all the data blocks b _{1 to} b ₇ are not decodable, the CPU 10 proceeds to step # 7, and for each data block b _{1 to} b ₇ in the QR code 1 shown in FIG. Each decoding result is stored in the RAM 12, for example.
Next, in step # 8, the CPU 10 determines whether or not the previous decoding result is stored in the RAM 12. As a result of this determination, since the previous decoding result is not stored in the RAM 12, the CPU 10 returns to step # 1 again.

Next, during the second imaging operation, the CPU 10 sends the multi-gradation image signal output from the imaging device 14 to the binarization processing unit 15 in step # 1. As described above, the binarization processing unit 15 binarizes multi-tone image signals using threshold values, and obtains binarized image data D ₂ as shown in FIG. 6, for example. . Position of the QR code 1 in on the binary image data D ₂ is moved to the left from the position of the QR code 1 on the binary image data D _1. Then, CPU 10 at step # 2, based on the binary image data _{D 2} detects a QR code 1, at step # 4, the check described in each error correction block in QR Code 1 Is used to detect and correct errors.

Next, in step # 5, the decoding unit 16 performs decoding for each of the data blocks b _{1 to} b ₇ in the QR code 1 from the binarized image data D ₂ . Figure 7 shows the result of decoding of each data block _b 1 ~b _7, for example, a decodable for each data block _{b 1, b 2, b 4} ~b 7 (OK), the decoding for each data block _{b 3} Impossible (NG).

Next, the decoding judgment unit 17 in step # 6, it is judged Yes, not for each decoding result of each data block b ₁ ~b ₇ in QR code 1 as shown in FIG. 7, in the QR code 1 That each data block b ₁ , b ₂ , b _{4 to} b ₇ is normally decoded and each data block b _{3 in} the QR code 1 is not normally decoded. Judge that it is missing. However, since the determination results of all the data blocks b _{1 to} b ₇ are not decodable, the decode determination unit 17 sends this fact to the CPU 10. Thus, CPU 10, at step # 7, is stored in for example RAM12 each decoding result of each data block _b 1 ~b ₇ in QR code 1 shown in FIG.

Note that each decoding result for each of the data blocks b _{1 to} b ₇ in the QR code 1 shown in FIG. 5 acquired during the first imaging operation and the QR code 1 shown in FIG. 7 acquired during the second imaging operation are shown. The difference between the decoding results for each of the data blocks b _{1 to} b _{7 in} FIG. 4 is that the product 20 is moved once within the imaging range of the imaging device 14 by an operator's operation, for example. As shown in FIG. 6, the positional relationship between the QR code 1 and the LEDs 21-1 to 21-6 changes, and the illumination position with respect to the QR code 1 and the amount of illumination light change due to the change in the positional relationship. As a result, for example, as shown in FIG. 9, the QR code 1 has a plurality of portions where the amount of reflected light increases, so-called whiteout portions 2, or illumination unevenness occurs, for example, as shown in FIG. In some cases, the darkness level of the corners of one is lower than that of the other parts, resulting in a dark image part 3.

Next, in step # 8, the CPU 10 determines whether or not the previous decoding result is stored in the RAM 12, and as a result of this determination, the RAM 12 stores the previous decoding result in the QR code 1 shown in FIG. Since there is storage of each decoding result for each of the data blocks b _{1 to} b _{7, a} command for combining the decoding results is issued to the decoding combination unit 18.

In step # 9, the decoding combination unit 18 performs decoding for each data block b _{1 to} b ₇ in the QR code 1 shown in FIG. 5 at the time of the first imaging operation stored in the RAM 12, 7 and the respective decoding results for each of the data blocks b _{1 to} b ₇ in the QR code 1 shown in FIG.
Next, for example, the decoding combination unit 18 makes each data block b ₂ , b that is missing and becomes undecoded among the decoding results for each data block b _{1 to} b ₇ in the QR code 1 shown in FIG. ₄ decode data is read from the decode results of the data blocks b ₂ and b _{4 in} the QR code 1 shown in FIG.
Next, the decode combination unit 18 reads the decoded data of the data blocks b ₂ and b _{4 in} the QR code 1 shown in FIG. 7 and the data blocks b ₁ to b in the QR code 1 shown in FIG. Of the decoding results for every _{7, the} data blocks b ₂ and b ₄ are rewritten to be missing because they cannot be decoded. As a result, the decoding combination unit 18 acquires the final decoding result for each of the data blocks b _{1 to} b ₇ in the QR code 1 as shown in FIG. As the final decoding result, the decoding results of all the data blocks b _{1 to} b _{7 in} the QR code 1 can be decoded.

For example, the decoding combination unit 18 decodes the decoded data of the data block b ₃ which is missing and becomes undecoded among the decoding results for each of the data blocks b _{1 to} b ₇ in the QR code 1 shown in FIG. Read from the decoding result of each data block b _{3 in} the QR code 1 shown in FIG. 5, and the read decoded data of the data block b ₃ in the QR code 1 shown in FIG. 5 is the data in the QR code 1 shown in FIG. it may be rewritten in the block _{b 3.}

Next, in step # 6, the decode determination unit 17 again determines whether or not each decode result for each data block b _{1 to} b ₇ in the QR code 1 shown in FIG. It is determined that each decoding of all the data blocks b ₁ , b ₃ , b _{5 to} b ₇ is normally performed.
However, in step # 10, the CPU 10 sends each decoding result for each of the data blocks b _{1 to} b ₇ in the QR code 1 shown in FIG. 8 to an external device such as a POS system through the communication I / F 13, for example. Then, in step # 11, the CPU 10 decodes each data block b _{1 to} b ₇ in the QR code 1 shown in FIG. 5 stored in the RAM 12 and each QR code 1 shown in FIG. The decoding results of the data blocks b ₂ and b ₄ are cleared, and the decoding results of the data blocks b _{1 to} b ₇ in the QR code 1 shown in FIG. 8 are also cleared.

At the time of the first imaging operation, the decode determination unit 17 determines whether or not each decode result for each data block b _{1 to} b ₇ in the QR code 1 as shown in FIG. However, as a result of this determination, if all the data blocks b _{1 to} b ₇ are determined to be decodable, the decode combining unit 18 finalizes the decoded data of each data block b _{1 to} b ₇ of the determination result. Is the decoding result.

As described above, according to the above-described embodiment, for example, decoding is impossible among the decoding results for each of the data blocks b _{1 to} b ₇ in the QR code 1 illustrated in FIG. 5 at the time of the first imaging operation, for example. reads the missing data blocks b _2, decoded data of b _4, for example, from second each decoding result of each data block b _2, b ₄ in QR code 1 shown in FIG. 7 at the time of imaging operation, the rewriting the decoded data for each data block b _2, b ₄ read the QR code each data block b ₂ missing become decode not among the decoded result in _1, b ₄ shown in FIG. 5. As a result, it is possible to obtain a final decoding result in which the decoding results of all the data blocks b _{1 to} b ₇ as shown in FIG. 8 can be decoded.

Therefore, for example, when the product 20 is moved once within the imaging range of the imaging device 14 by the operation of the operator, the QR code 1 and each of the LEDs 21-1 to 21-6 as shown in FIGS. The illumination position with respect to the QR code 1 and the amount of illumination light change due to the change in the positional relationship. For example, as shown in FIG. For example, as shown in FIG. 10 above, even if illumination unevenness occurs and the darkness level of the corner of the QR code 1 is lower than that of the other portions and the dark image portion 3 is generated, it cannot be decoded and is missing. The decoded data of the existing data block can be rewritten to decode data that can be decoded. As a result, for example, even if the product 20 is moved once within the imaging range of the imaging device 14 by the operation of the operator, the final decoding result in which the decoding results of all the data blocks b _{1 to} b ₇ can be decoded is obtained. You can get it. Thereby, the success rate of decoding QR code 1 can be improved.

In the above embodiment, for example, all the data blocks b are obtained by combining the decode results that can be decoded from the decode results for each of the data blocks b _{1 to} b ₇ in the QR code 1 acquired by two imaging operations, for example. _Although the final decoding result in which the decoding results _{1 to} b ₇ are decodable is acquired, the present invention is not limited to this, and for example, when the product 20 moves once within the imaging range of the imaging device 14, for example, three times If the above imaging operation is performed, all the decoding results that can be decoded are combined from the decoding results for each of the data blocks b _{1 to} b ₇ in the QR code 1 respectively acquired by these three or more imaging operations. decoding result of the data blocks b ₁ ~b ₇ may acquire the final decoding result is decodable.

Note that 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. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
For example, in the above-described embodiment, the case where the data code is applied to the reading of the QR code 1 has been described. However, the present invention is not limited to this, and the present invention can be applied to the case of reading a data code such as a two-dimensional bar code or a symbol. is there.

1 is a configuration diagram showing an embodiment of a data code reading device according to the present invention. The schematic diagram which shows the some data block in QR Code read by the apparatus. The data code reading flowchart in the same apparatus. FIG. 4 is a schematic diagram of binarized image data acquired by the first imaging operation of the imaging apparatus in the apparatus. FIG. 6 is a schematic diagram showing a decoding result of each data block in the QR code during the first imaging operation by the apparatus. FIG. 6 is a schematic diagram of binarized image data acquired by a second imaging operation of the imaging device in the same device. FIG. 6 is a schematic diagram showing a decoding result of each data block in the QR code during the second imaging operation by the apparatus. The schematic diagram which shows the last decoding result with respect to each data block in QR Code acquired by the apparatus. The schematic diagram which shows the image data which the overexposure part produced in QR Code. The schematic diagram which shows the image data which the dark image part produced by illumination unevenness in QR Code.

Explanation of symbols

  1: QR code, 10: CPU, 11: ROM, 12: RAM, 13: communication interface (communication I / F), 14: imaging device, 15: binarization processing unit, 16: decoding unit, 17: decoding determination Part, 18: decoding combination part, 19: lighting part, 20: product, 21-1 to 21-n: LED.

Claims (9)

An imaging device that repeatedly attaches an image to an object that is attached to a moving object and includes at least a data code including a plurality of data blocks;
A decoding unit that decodes each of the plurality of data blocks with respect to each of at least two image data acquired by repeated imaging by the imaging device;
A decoding determination unit that determines whether the decoding result by the decoding unit is possible or not for each of the plurality of data blocks of the at least two image data;
A decoding combination unit that obtains a final decoding result by combining the decoding data of each of the data blocks determined to be decodable by the decoding determination unit;
A data code reading apparatus comprising:   As a result of the determination by the decode determination unit, the decode combination unit determines that the decoded data missing in the data block is the same as the data block and can be decoded if there is the data block that cannot be decoded. 2. The data code reading device according to claim 1, wherein the data code reading device is rewritten to decode data of the data block of the other image data. The decoding unit performs decoding for each of the plurality of data blocks with respect to each of the at least two image data acquired when the object moves once across the imaging range of the imaging device,
The decoding determination unit determines whether the decoding result by the decoding unit is acceptable;
The decoding combination unit obtains a final decoding result by combining the decoding data of the data blocks determined to be decodable by the decoding determination unit,
The data code reader according to claim 1.   The decoding combination unit is a determination result indicating that at least one data block cannot be decoded as a result of the decoding for each of the plurality of data blocks with respect to the image data acquired by first imaging by the imaging device. The decoded data missing in the undecodable data block is determined to be undecodeable among the decoding results for the respective image data acquired by the second or subsequent imaging by the imaging device. 2. The data code reading apparatus according to claim 1, wherein the data code reading device is rewritten to the decoded data of the data block that is the same as the block and is determined to be decodable.   The decoding combination unit stores the decoded data of the plurality of data blocks including the data block that cannot be decoded if the determination result is that the at least one data block cannot be decoded. The imaging data of the plurality of stored data blocks is rewritten to the decoded data of the data block determined to be decodable from the stored decoded data of the plurality of data blocks after the second imaging. 4. The data code reading device according to 4.   The decoding combination unit decodes the image data obtained by the first imaging by the imaging device for each of the plurality of data blocks by the decoding unit, so that all the data blocks can be decoded. 2. The data code reading apparatus according to claim 1, wherein the decoded data of the plurality of data blocks is used as the final decoding result.   The data code reader according to claim 1, wherein the data code is a QR code. Repetitively image a region attached to a moving object and including at least a data code composed of a plurality of data blocks,
Perform decoding for each of the plurality of data blocks for each of at least two image data acquired by repeated imaging,
Determining whether the decoding result is possible or not for each of the plurality of data blocks of the at least two image data;
The final decoding result is obtained by combining the decoding data of each data block determined to be decodable by the determination of the decoding result,
A data code reading method.   If there is the data block that cannot be decoded as a result of the determination as to whether the decoding result is possible or not, the other decoded data that is determined to be the same as the data block and that can be decoded are included in the data block. 9. The data code reading method according to claim 8, wherein the data block is rewritten to decoded data of the data block.

Images