JP2009276947A - Code reading device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for preventing a barcode read error. <P>SOLUTION: A code reading device comprises: a CPU 11 for decoding reading data output by a scanner section 16; a flash memory 17 for storing a grade of a decode parameter for each of a plurality of decode parameters to be used when decoding; a flash memory 17 for storing the combination information composed of a plurality of decode parameters; a CPU 11 for generating combination of a plurality of decode parameters; a CPU 11 for acquiring a grade of a decode parameter based on the generated combination and for computing the total grade of the decode parameter; a CPU 11 for acquiring the combination information corresponding to the generated combination and for computing the determination information for determining whether the read data is to be decoded or not based on the obtained combination information and the total grade; and a CPU 11 for controlling to execute decoding or not based on the determination information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a code reader and a program.

  Conventionally, a code reading device (hereinafter referred to as a bar code reader) that reads a data code indicating a bar code or a two-dimensional code is known.

  The barcode read by the barcode reader is composed of a black bar and a white space, and numerical values and characters are expressed by combinations of the respective widths. Bar codes with poor print quality (hereinafter referred to as damage bar codes) have a width that is far from the specified value, and includes dust (noise) due to bar image defects or dirt.

Therefore, there are known techniques for decoding the barcode reading data read by the barcode reader by changing the width of the black bar or white space, and for decoding by changing the criteria for determining the width. It has been.
In addition, when the distance from the barcode reader to the barcode is long, a technique for increasing the scanning width of the light beam so that the barcode is included in the readable range is also known (see, for example, Patent Document 1). ).
JP 2005-63142 A

  However, with the above technique, there is a high possibility that misreading occurs. For example, when the width of the black bar or white space of the read data is changed, decoding is performed with the read data changed, and the possibility of misreading the barcode is increased.

In order to prevent misreading of a barcode, a technique for performing collation and check digit calculation is known. Here, collation refers to collating data obtained by reading a barcode and converting it into characters and numerical values and data obtained by converting a previously (previous) read barcode into characters and numerical values. Check digit calculation is a calculation method used for maintaining the accuracy of data obtained by converting a read barcode into characters or numerical values.
However, when collation is performed, collation is not effective for barcodes that are misread continuously. In addition, regarding check digit calculation, there is a possibility that a bar code of a standard that does not support the check digit exists, or that the check digit itself is misread and the check digit calculation happens to coincide. For this reason, there was a problem that misreading of the barcode could not be prevented.

  The subject of this invention is providing the technique which prevents the misreading of a barcode.

In order to solve the above-described problems, a code reading device according to a first aspect of the present invention provides:
Reading means for reading a data code indicating a bar code or a two-dimensional code and outputting the read read data;
Decoding means for decoding the read data output by the reading means;
Reliability information storage means for storing reliability information representing reliability of decoding for each of a plurality of decoding parameters used at the time of decoding by the decoding means;
Combination storage means for storing combination information in which the plurality of decoding parameters are combined;
Generating means for generating a combination of the plurality of decoding parameters;
Based on the combination generated by the generation unit, the reliability information corresponding to each decoding parameter is acquired from the reliability information storage unit, and a calculation unit that calculates the total of the acquired reliability information;
The combination information corresponding to the combination generated by the generation unit is acquired from the combination storage unit, and read by the reading unit based on the acquired combination information and the total calculated by the calculation unit. Determination information calculating means for calculating determination information for determining whether to decode the read data;
First decoding control means for controlling whether to cause the decoding means to execute decoding based on the judgment information calculated by the judgment information calculating means;
Is provided.

The invention described in claim 2 is the code reader according to claim 1,
The first decoding control means includes:
When the determination information exceeds a predetermined allowable value, the decoding unit does not execute decoding. When the determination information is within the predetermined allowable value, the determination unit is based on the combination generated by the generation unit. Then, the decoding unit executes decoding.

The invention described in claim 3 is the code reader according to claim 1 or 2,
The reliability information storage means includes
A plurality of parameter setting steps are provided for each decoding parameter, and the reliability information is stored corresponding to each parameter setting step.

According to a fourth aspect of the present invention, in the code reading device according to any one of the first to third aspects,
The combination information is
Including magnification information set for each combination of the plurality of decoding parameters;
The determination information calculation means includes
The determination information is calculated by adding the magnification information and the sum.

According to a fifth aspect of the present invention, in the code reader according to any one of the first to fourth aspects,
When the determination information calculated by the determination information calculation means exceeds a predetermined allowable value, output means for outputting a decoding result decoded by the decoding means;
First adjustment means for adjusting the reliability information and the combination information based on the decoding result output by the output means;
First storage control for storing reliability information adjusted by the first adjustment unit in the reliability information storage unit, and storing combination information adjusted by the first adjustment unit in the combination information storage unit Means,
Is provided.

The invention according to claim 6 is the code reader according to any one of claims 1 to 4,
Second decoding control means for controlling whether to cause the decoding means to execute decoding based on the combination generated by the generating means;
When the decoding of the decoding means is executed by the second decoding control means, the decoded result is compared with whether or not the decoded result in which the data code is properly decoded matches, and the comparison result Based on the second adjustment means for adjusting the reliability information and the combination information;
Second storage control for storing reliability information adjusted by the second adjustment unit in the reliability information storage unit and storing combination information adjusted by the second adjustment unit in the combination information storage unit Means,
The code reading device according to any one of claims 1 to 4, further comprising:

The program of the invention described in claim 7 is:
Computer
Reading means for reading a data code indicating a bar code or a two-dimensional code and outputting the read data;
Decoding means for decoding the read data output by the reading means;
Reliability information storage means for storing reliability information representing reliability of decoding for each of a plurality of decoding parameters used at the time of decoding by the decoding means;
Combination storage means for storing combination information in which the plurality of decoding parameters are combined;
Generating means for generating a combination of the plurality of decoding parameters;
Calculation means for acquiring the reliability information corresponding to each decoding parameter from the reliability information storage means based on the combination generated by the generation means, and calculating the total of the acquired reliability information;
The combination information corresponding to the combination generated by the generation unit is acquired from the combination storage unit, and read by the reading unit based on the acquired combination information and the total calculated by the calculation unit. Determination information calculating means for calculating determination information for determining whether to decode the read data;
First decoding control means for controlling whether or not to cause the decoding means to perform decoding based on the judgment information calculated by the judgment information calculating means;
To function as.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which prevents the misreading of a barcode can be provided.

  Hereinafter, an example of an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

(First embodiment)
A first embodiment according to the present invention will be described with reference to FIGS. Hereinafter, a description will be given using a code reader (hereinafter referred to as a barcode reader) that reads a barcode as a data code. First, the operation when the barcode reader 1 reads the barcode A will be described with reference to FIG. The bar code A is a data code composed of a black bar and a white space, and numerical values and characters are expressed by combinations of the respective widths. The barcode reader 1 irradiates the barcode A with laser light and receives reflected light of the irradiated laser light. Then, reading data (binary data) of the barcode A is acquired based on the received reflected light, the acquired reading data is decoded, and numerical values / characters expressed by the barcode A are acquired.

  Next, the internal configuration of the barcode reader 1 will be described with reference to FIG. As shown in FIG. 2, the barcode reader 1 includes a decoding unit, a generating unit, a calculating unit, a determination information calculating unit, a CPU (Central Processing Unit) 11 as a first decoding unit, an input unit 12, and a RAM 13 ( A random access memory (Random Access Memory), a display unit 14, a ROM (Read Only Memory) 15, a scanner unit 16 as a reading unit, a reliability information storage unit, and a flash memory 17 as a combination storage unit. Are connected via a bus 19. Each unit is supplied with power from the power supply unit 18.

  The CPU 11 centrally controls each part of the barcode reader 1. The CPU 11 develops a program specified from the system program and various application programs stored in the ROM 15 in the RAM 13 and executes various processes in cooperation with the program expanded in the RAM 13.

  The CPU 11 generates a combination of a plurality of decoding parameters in cooperation with the first program stored in the ROM 15, and sets reliability information corresponding to each decoding parameter based on the generated combination in the parameter score table 90. Is obtained from the flash memory 17 in which is stored, the total of the obtained reliability information is calculated, and the combination information corresponding to the generated combination is obtained from the flash memory 17 in which the combination score table 91 is stored. Based on the acquired combination information and the calculated reliability information, determination information for determining whether to decode the read data read by the scanner unit 16 is calculated and calculated. Based on the determination information, decoding of the read data is controlled.

The decode parameter is a parameter used when decoding the read data of the barcode read by the scanner unit 16. The decode parameters correspond to param-1 to param-10 described later.
To generate a combination of decoding parameters, the number of decoding parameter setting steps is set for each decoding parameter, one step is selected from the number of setting steps set by each decoding parameter according to the rule, and all decoding parameters are set. It means generating a combination of the number of steps selected in (param-1 to param-10). The number of decoding parameter setting stages refers to the number of stages provided according to the contents of the decoding parameters. The number of decoding parameter setting steps corresponds to “set1” to be described later. Decoding parameter combinations are generated by setting each decoding parameter, for example, “param-1” is “set-1”, param-2 is “set-2”, and param-10 is “set-1”. This is executed by selecting one stage from the set number of stages and generating a combination of stages selected by all the decoding parameters (param-1 to param-10).
The reliability information is information representing the reliability of decoding, and corresponds to the number of decoding parameters described later. The total reliability information is the total number of decoding parameters.
The combination information is information obtained by combining the decode parameters, and refers to a combination number in a combination score table 91, which will be described later, a combination of the number of steps set for each decode parameter, and a score magnification.
Acquiring combination information corresponding to the generated combination means searching for combination information that matches the generated combination of decode parameters from the combination score table 91 and acquiring the searched combination information. Specifically, referring to the combination score table 91, the combination score table 91 is searched for a combination of the set number of steps of each decoding parameter that matches the generated combination (a combination of the number of setting steps selected by each decode parameter). In this case, the score magnification corresponding to the searched combination is acquired.
The determination information is information for determining whether or not the read data read by the scanner unit 16 is to be decoded, and is information obtained by integrating the acquired score magnification and the total score of the calculated decoding parameters. That means. The determination information corresponds to a total value described later.

  The input unit 12 includes various keys such as a trigger key for instructing barcode reading, numeric / character input keys, and various function keys, and outputs a key input signal of each key pressed by the operator to the CPU 11. The input unit 12 may be configured as a touch panel integrally with the display unit 14.

  The RAM 13 is a volatile memory that temporarily stores information, and has a plurality of work areas that store various programs to be executed and data related to these various programs.

  The display unit 14 includes an LCD (Liquid Crystal Display), an ELD (ElectroLuminescent Display), and the like, and performs various displays according to a display signal from the CPU 11.

  The ROM 15 is a storage unit in which various programs and various data are stored in advance for reading only. The ROM 15 stores a first program described later.

  The scanner unit 16 reads a barcode in accordance with a control signal from the CPU 11 and outputs the read data (binary data) read to the CPU 11.

  The flash memory 17 is a storage unit that can read and write information such as various data. The flash memory 17 stores a parameter table 30, a parameter score table 90, and a combination score table 91 described later.

  Next, the parameter table 30 will be described with reference to FIG. The parameter table 30 is a table that defines the setting contents of the decoding parameter corresponding to the number of setting steps for each decoding parameter. param-1 to param-10 indicate each decoding parameter used when decoding the read data. set-1 to set-8 indicate the number of setting stages of each decoding parameter. Each decoding parameter (param-1 to param-10) is set according to the number of decoding parameter setting stages. The number of setting stages indicates that the higher the setting stage value, the higher the possibility of misreading.

  param-1 (margin check parameter) is reduced to what extent the left and right margin widths of the read data (the binarized data of the black bar and white space constituting the barcode and the left and right margin widths) are reduced. Even if it is determined that reading is OK, this is a decoding parameter that represents the minimum value by a magnification. In order to be able to read a barcode with a small left and right margin width, it is necessary to reduce the magnification. For example, in the case of “set-1”, the margin check parameter is set to “6 times”, and in the case of “set-2”, the margin check parameter is set to “4 times”.

param-2 (inter-character gap parameter) indicates whether the reading is OK (success) or NG (failure) by checking the size of the gap (space) between characters (a group consisting of several black bars and white space). This is a decoding parameter for setting the determination to be valid or invalid. For example, in the case of “set-1”, the inter-character gap parameter is set to “valid”. In this case, it is determined whether the reading of the barcode reading data is OK or NG based on a predetermined gap between characters. For example, when the gap between characters of the read data read is larger than a predetermined gap between characters, the reading is determined as NG.
In the case of “set-2”, the inter-character gap parameter is set to “invalid”. In this case, the determination as to whether reading is OK or NG is not performed based on the gap between characters.

param-3 (a delineator parameter) is a decoding parameter for setting whether the read OK or NG determination is valid or invalid by checking the ratio of the black bar width to the white space width constituting the delimiter and the guard bar. Here, the delineator will be described with reference to FIGS. 4 and 5. FIG. 4A shows an add-on. An add-on refers to a 2-digit or 5-digit supplementary code added after an EAN code or the like. FIG. 4A shows a 5-digit add-on. FIG. 4B is a diagram showing a delineator. As shown in FIG. 4B, the delineator refers to a group of bars composed of one white space and one black bar existing between characters in the add-on. The ratio of white space to black bar is approximately 1: 1. When the check is performed, for example, determination is made that reading is OK when the size of the black bar is within a range of ± 25% with respect to the size of the white space, and reading NG is performed when the size is out of the range. 5A and 5B are diagrams showing guard bars. The guard bar refers to a group of bars existing at the left end and the right end of the bar code in the EAN code, JAN code, UPC-A code, and UPC-E. The number of bars constituting the guard bar varies depending on the type of cord. For example, in the case of an EAN code, a JAN code, and a UPC-A code, as shown in FIG. 5A, the code is composed of two black bars and one white space. The ratio of these bars is approximately 1: 1: 1. In the case of the UPC-E code, as shown in FIG. 5B, the leftmost guard bar is composed of two black bars and one white space. The ratio of these bars is approximately 1: 1: 1. The rightmost guard bar is composed of three black bars and two white spaces. The ratio of these bars is approximately 1: 1: 1: 1: 1. When the check is performed, for example, determination is made that reading is OK when the size of the black bar is within a range of ± 25% with respect to the size of the white space, and reading NG is performed when the size is out of the range.
For example, in the case of “set-1”, the delineator parameter is set to “valid”. In this case, the ratio between the black bar width and the white space width constituting the delineator included in the add-on is checked to determine whether reading is OK or NG. Further, in this case, it is determined whether or not the left / right ratio of the guard bar is larger than a predetermined ratio. For example, regarding the black bar and white space constituting the delineator, if the black bar width exceeds the predetermined allowable range with respect to the white space width, the reading is determined to be NG. If the guard bar ratio is larger than a predetermined threshold, the reading is determined as NG.
In the case of “set-2”, the delineator parameter is set to “invalid”. In this case, whether the reading is OK or NG is not executed based on the delineator and the guard bar.

  param-4 (threshold (magnification) parameter) is a decoding parameter for changing the threshold for identifying whether the width of the black bar and the white space is thick or thin. For example, in the case of “set-1”, the threshold (magnification) parameter is set to “black × 1.5 white × 1.5”. In this case, the threshold value (magnification) for the black bar is set to “1.5”, and the threshold value (magnification) for the white space is set to “1.5”.

param-5 (threshold (reference position) parameter) is used to calculate the black bar and white space reference width and the white space reference width in order to calculate the tendency of the black bar and white space width to increase in the entire barcode. This is a decoding parameter for switching a reference position to be referred to when acquiring. The reference width of the black bar and the reference width of the white space are compared, the black and white fatness tendency is calculated, and the correction is performed based on the tendency to perform decoding. 6 to 8 show the relationship between each code and the reference position. First, FIG. 6 shows a reference position in each barcode. FIG. 6A is a diagram illustrating reference positions (left guard bar, center bar) of EAN, JAN, and UPC-A codes. FIG. 6B is a diagram showing the reference position (left guard bar, right guard bar) of the UPC-E code. FIG. 6C is a diagram illustrating a reference position (start pattern) of the add-on code. Next, FIGS. 7 and 8 show the relationship between the barcode (analysis code) and the reference position. FIG. 7A shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-1” (LeftGB: (white + black) / 2 StartPattern). FIG. 7B shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-2” (CenterGB StartPattern). FIG. 7C shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-3” (LeftGB: (white + black) StartPattern). FIG. 8A shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-4” (LeftGB: (white + black) / 2 WPC section). FIG. 8B shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-5” (CenterGB: WPC section). FIG. 8C shows the relationship between the barcode and the reference position when the threshold (reference position) parameter is “set-6” (LeftGB: (white + black): WPC section).
For example, in the case of “set−1”, the threshold (reference position) parameter is set to “LeftGB: (white + black) / 2 StartPattern”. In this case, in the analysis of the EAN, JAN, UPC-A, and UPC-E codes, the reference position becomes the left guard bar to calculate the tendency of the black bar and white space to become thicker, and the optical characteristics are corrected and corrected. Perform the calculation. In addition, in the analysis of the add-on code, the reference position for calculating the thinning tendency of the black bar / white space is the start pattern.
In the case of “set-2”, the threshold (reference position) parameter is set to “(CenterGB StartPattern)”. In this case, in the analysis of the EAN, JAN, UPC-A, and UPC-E codes, the reference position for calculating the tendency of the black bar / white space to become thicker is the center bar. In addition, in the add-on code analysis, the reference position for calculating the tendency of the black bar / white space to become thicker is a start pattern.

  param-6 (threshold (monochrome) parameter) is a decoding parameter for setting whether or not binarization (or quaternarization) of black bars and white spaces is performed collectively. For example, in the case of “set-1”, the threshold (monochrome) parameter is set to “monochrome mixture calculation”. In this case, the black bar and the white space are collectively binarized (or binarized). In the case of “set-2”, the threshold (monochrome) parameter is set to “monochrome separation calculation”. In this case, the black bar and the white space are binarized (or binarized) separately.

  param-7 (thickening / thinning correction parameter) is a decoding parameter for setting whether to increase or decrease the width of the black bar or white space. For example, in the case of “set-1”, the fat / thin correction parameter is set to “no correction”. In this case, thickening / thinning correction of the black bar or white space is not executed. In the case of “set-2”, the thinning correction parameter is set to “white thickness 0.6 module”. In this case, the white space width is corrected by 0.6 modules. The module is a unit of the smallest bar or space width among all black bars and white spaces in the barcode.

  param-8 (noise parameter) is a decoding parameter for setting the width of a bar regarded as noise when performing noise removal. For example, in the case of “set-1”, the noise parameter is set to “invalid”. In this case, noise removal is not performed. In the case of “set-2”, the noise parameter is set to “40 Count”. In this case, the width of the bar regarded as noise when performing noise removal is set to 40 counts. The count is a clock count number.

  param-9 (character difference parameter) is a decoding parameter that enables or disables the determination of the difference between successive character widths. For example, in the case of “set-1”, the character difference parameter is set to “valid”. In this case, based on the difference value between successive character widths, a determination is made as to whether reading is OK or NG. In the case of “set-2”, the character difference parameter is set to “invalid”. In this case, whether the reading is OK or NG is not executed based on the difference value between the character widths.

  param-10 (maximum / minimum check parameter) is a decoding parameter that enables or disables the determination of the ratio between the minimum bar having the minimum width and the maximum bar having the maximum width in the character. For example, in the case of “set-1”, the maximum / minimum check parameter is set to “valid”. In this case, a determination is made as to whether reading is OK or NG based on the ratio between the minimum bar and the maximum bar in the character. In the case of “set-2”, the maximum / minimum check parameter is set to “invalid”. In this case, whether the reading is OK or NG is not performed based on the ratio between the minimum bar and the maximum bar.

  Next, the parameter score table 90 will be described with reference to FIG. Each numerical value of the parameter score table 90 indicates a parameter score corresponding to the number of parameter setting steps in each decoding parameter (param1 to param10). For example, the decode parameter score in “set-1” of param1 (margin check parameter) is “0”, the decode parameter score in “set-2” is “2”, and the decode parameter score in “set-3” is “4” is shown.

Next, the combination score table 91 will be described with reference to FIG.
The combination score table 91 includes a combination No, the number of steps set for each decoding parameter ("param-1" to "param-10"), and "ratio" (score magnification). The combination No. is an identification number of each decoding parameter combination. The number of setting stages of each decoding parameter is one setting stage number selected by each decoding parameter “param-1” to “param-10”. For example, combination No. The number of setting stages of each decoding parameter in 1 is “param-1” (margin check parameter): “set2”, “param-2” (inter-character gap parameter): “set2”, “param-3” (delineator) Parameter): “set1”, “param-4” (threshold (magnification) parameter): “set1”, “param-5” (threshold (reference position) parameter): “set1”, “param-6” (threshold ( (Black and white) parameters): “set1”, “param-7” (thickness correction parameter): “set1”, “param-8” (noise parameter): “set1”, “param-9” (character difference parameter) : “Set1”, “param-10” (maximum and minimum parameters): “set1”. That is, the combination No. 1 includes a margin check parameter “6 times”, an inter-character gap parameter “invalid”, a delineator “valid”, a threshold (magnification) parameter “black * 1, 5, white * 1.5”, and a threshold (reference position) parameter. “LeftGB (white + black) / 2 StartPattern”, threshold (black and white) parameter “black and white mixed calculation”, thickening correction parameter “no correction”, noise parameter “invalid”, character difference parameter “valid”, maximum and minimum check parameter “Valid”, indicating that these decoding parameters are combined.
“Ratio” indicates a point magnification. The point magnification is a magnification value assigned according to a combination of decoding parameters. It indicates that the higher the magnification value of the point magnification, the higher the possibility of misreading when reading the barcode using each decoding parameter corresponding to the combination.
Further, the score of each decode parameter in the parameter score table 90 and the score magnification in the combination magnification table 91 were read and evaluated while customizing each decode parameter for various damage barcodes, and the tendency of misreading was investigated. Based on the result, the value is set in advance.

Next, the operation of the barcode reader 1 will be described.
First, the first process executed by the barcode reader 1 will be described with reference to FIGS. In the first process shown in FIG. 11, the score of the decode parameter corresponding to each decoding parameter setting stage is acquired, the total score of the acquired decode parameter score and the score magnification are integrated, and the calculated integrated value is obtained. This is a process for controlling whether or not to execute decoding based on this.

  For example, when the execution instruction of the first process is input via the input unit 12 as a trigger, the first program read from the ROM 15 and appropriately expanded in the RAM 13 and the CPU 11 cooperate with each other in FIG. The first process shown in FIG.

  It is assumed that an upper limit value of the number of setting stages for each decoding parameter (the number of setting stages at the right end of each decoding parameter in the parameter table 30) is stored in an arbitrary work area (working area) of the RAM 13 in advance. Specifically, param-1 (margin check parameter) is “set-3”, param-2 (character gap parameter) is “set-2”,... Param-10 (character gap parameter) “Set-2” is stored in the work area of the RAM 13.

  First, read data read via the scanner unit 16 is acquired (step S11). Then, the current combination of decoding parameters (parameters) is initialized (step S12). Initialization means setting the number of setting stages of the current decoding parameter to “set−1”. At this time, the initialized number of set stages is stored in an arbitrary work area of the RAM 13. Then, decoding is executed by reflecting the combination of the current decoding parameters (parameters) initialized in step S11 (step S13). Decoding refers to converting the read data acquired in step S11 into data such as characters and numerical values.

Then, it is determined whether or not the decoding result is OK (step S14). Specifically, the decoding result executed in step S13 is analyzed, and it is determined whether or not the decoding result is OK based on whether or not the conversion to some character or numerical value is completed. When it is determined that the decoding result is OK (step S14; YES), the first process is terminated. When the decoding result is determined to be NG (step S14; NO), parameter customization processing is executed (step S15).

  Here, the parameter customization process will be described with reference to FIGS. 12 and 13. First, after the execution of step S14 of the first process, the number of setting stages of param-1 (margin check parameter) is incremented by 1 (step S151). When the number of setting stages is incremented by 1, the number of setting stages stored in the RAM 13 is updated and stored in step S12. For example, the set stage number of param-1 (margin check parameter) is updated and stored from “set-1” to “set-2”.

  Then, it is determined whether or not the number of setting stages of param-1 (margin check parameter) exceeds set-3 (step S152). The determination in this step is performed by comparing the upper limit value of the number of setting stages of each decoding parameter stored in the RAM 13 in advance with the number of setting stages of each decoding parameter updated and stored in the RAM 13 in step S151. Is called. Similar processing is performed in steps S155, S157, S159, S161, S163, S165, S167, S169, and S171. For example, in this step, the upper limit value (“set-3”) of the number of setting stages of param-1 (margin check parameter) stored in advance in the RAM 13 and the number of setting stages updated and stored in the RAM 13 in step S152. “Set-2” is compared. In this case, since “set-2” does not exceed “set-3”, the determination result is “NO”, and the subsequent processing is performed. Then, the parameter customization process is repeatedly executed (for example, step S19 described later; NO or step S21; if NO, the parameter customization process is repeatedly executed), and the number of setting stages of param-1 (margin check parameter) is set. When “set-4” is set, the determination result is “YES”, and the process proceeds to step S154.

  If it is determined that the number of setting stages of param-1 (margin check parameter) does not exceed set-3 (step S152; NO), parameter customization is set as successful (step S153). After execution of step S153, the process proceeds to step S16 of the first process. If it is determined that the number of setting stages of param-1 (margin check parameter) exceeds set-3 (step S152; YES), the number of setting stages of param-2 (inter-character gap parameter) is incremented by one, and param -1 (margin check parameter) is set (set) to set-1 (step S154).

  After execution of step S154, it is determined whether or not the number of steps set for param-2 (inter-character gap parameter) exceeds set-2 (step S155). If it is determined that the setting stage number of param-2 (inter-character gap parameter) does not exceed set-2 (step S155; NO), the process proceeds to step S153. If it is determined that the number of setting stages of param-2 (inter-character gap parameter) exceeds set-2 (step S155; YES), the number of setting stages of param-3 (delineator parameter) is incremented by one, and param -2 (gap parameter between characters) is set to set-1 (step S156).

  After execution of step S156, it is determined whether or not the number of setting stages of param-3 (a delineator parameter) exceeds set-2 (step S157). If it is determined that the number of setting stages of param-3 (a delineator parameter) does not exceed set-2 (step S157; NO), the process proceeds to step S153. If it is determined that the number of setting stages of param-3 (delineator parameter) exceeds set-2 (step S157; YES), the number of setting stages of param-4 (threshold (magnification) parameter) is incremented by 1, param-3 (a delineator parameter) is set to set-1 (step S158).

  After execution of step S158, it is determined whether or not the number of setting stages of param-4 (threshold (magnification) parameter) exceeds set-8 (step S159). When it is determined that the number of setting stages of param-4 (threshold (magnification) parameter) does not exceed set-8 (step S159; NO), the process proceeds to step S153. When it is determined that the number of setting stages of param-4 (threshold (magnification) parameter) exceeds set-8 (step S159; YES), the number of setting stages of param-5 (threshold (reference position) parameter) is +1 and param-4 (threshold (magnification) parameter) is set to set-1 (step S160).

  After execution of step S160, it is determined whether or not the number of steps set for param-5 (threshold (reference position) parameter) exceeds set-6 (step S161). When it is determined that the number of setting stages of param-5 (threshold (reference position) parameter) does not exceed set-6 (step S161; NO), the process proceeds to step S153. When it is determined that the number of setting stages of param-5 (threshold (reference position) parameter) exceeds set-6 (step S161; YES), the number of setting stages of param-6 (threshold (monochrome) parameter) is +1 and param-5 (threshold (reference position) parameter) is set to set-1 (step S162).

  After execution of step S162, it is determined whether or not the number of steps set for param-6 (threshold (monochrome) parameter) exceeds set-2 (step S163). If it is determined that the number of setting stages of param-6 (threshold (monochrome) parameter) does not exceed set-2 (step S163; NO), the process proceeds to step S153. If it is determined that the number of setting steps of param-6 (threshold (monochrome) parameter) exceeds set-2 (step S163; YES), the number of setting steps of param-7 (thickening correction parameter) is incremented by one. , Param-6 (threshold (monochrome) parameter) is set to set-1 (step S164).

  After the execution of step S164, it is determined whether or not the number of steps set for param-7 (thickness correction parameter) exceeds set-5 (step S165). When it is determined that the number of setting stages of param-7 (thickening / thinning correction parameter) does not exceed set-5 (step S165; NO), the process proceeds to step S153. If it is determined that the number of setting stages of param-7 (thickness correction parameter) exceeds set-5 (step S165; YES), the number of setting stages of param-8 (noise parameter) is incremented by 1 and param- 7 (thickness / thinning correction parameter) is set to set-1 (step S166).

  After execution of step S166, it is determined whether or not the number of setting steps of param-8 (noise parameter) exceeds set-5 (step S167). When it is determined that the number of setting stages of param-8 (noise parameter) does not exceed set-5 (step S167; NO), the process proceeds to step S153. If it is determined that the number of setting steps of param-8 (noise parameter) exceeds set-5 (step S167; YES), the number of setting steps of param-9 (character difference parameter between characters) is incremented by 1 and param- 8 (noise parameter) is set to set-1 (step S168).

  After execution of step S168, it is determined whether or not the number of steps set for param-9 (character difference parameter) exceeds set-2 (step S169). If it is determined that the number of setting stages of param-9 (character difference parameter) does not exceed set-2 (step S169; NO), the process proceeds to step S153. When it is determined that the number of setting stages of param-9 (character difference parameter) exceeds set-2 (step S169; YES), the number of setting stages of param-10 (maximum / minimum check parameter) is incremented by 1, param-9 (character difference parameter) is set to set-1 (step S170).

  After execution of step S170, it is determined whether or not the number of setting stages of param-10 (maximum / minimum check parameter) exceeds set-2 (step S171). If it is determined that the number of setting stages of param-10 (maximum / minimum check parameter) does not exceed set-2 (step S171; NO), the process proceeds to step S153. If it is determined that the number of setting stages of param-10 (maximum / minimum check) exceeds set-2 (step S171; YES), it is determined that parameter customization has failed (step S172). After execution of step S172, the process proceeds to step S16 of the first process.

  Then, based on the result of the parameter customization process executed in step S15, it is determined whether or not the parameter combination customization has failed (step S16). If it is determined that the parameter combination customization has failed (step S16; YES), it is determined that the reading is NG (step S17). When it is determined that the parameter combination has been successfully customized (step S16; NO), a total value calculation process is executed (step S18).

Next, the total value calculation process will be described with reference to FIG.
First, the number of setting stages of each decoding parameter set in the parameter customization process is acquired from the RAM 13. Then, the parameter score table 90 is searched, and a score corresponding to the current set stage number (set number) of param-1 (margin check parameter) is obtained (step S181). Then, the parameter score table 90 is searched, and the score corresponding to the current set number of param-2 (inter-character gap parameter) is acquired (step S182). Then, the parameter score table 90 is searched, and a score corresponding to the current set number of param-3 (a delineator parameter) is acquired (step S183). Then, the parameter score table 90 is searched, and the score corresponding to the current set number of param-4 (threshold (magnification) parameter) is acquired (step S184). Then, the parameter score table 90 is searched, and a score corresponding to the current set number of param-5 (threshold (reference position) parameter) is acquired (step S185). Then, the parameter score table 90 is searched, and the score corresponding to the current set number of param-6 (threshold value (monochrome parameter) is obtained (step S186), and the parameter score table 90 is searched and param-7. The score corresponding to the current set number of (thickness correction parameter) is acquired (step S187), and the parameter score table 90 is searched, and the score corresponding to the current set number of param-8 (noise parameter). (Step S188) The parameter score table 90 is searched, and the score corresponding to the current set number of param-9 (inter-character gap parameter) is acquired (Step S189). Table 90 is searched and param-10 (maximum minimum Tsu number corresponding to the current set number of click parameters) is acquired (step S190).

  After execution of step S190, the points acquired in steps S181 to S190 are summed (step S191). Then, the combination score table 91 is searched, and the score magnification corresponding to each combination of the set stage numbers of param-1 to param-10 is acquired (step S192). Specifically, the combination No. that matches the set number of steps of each decoding parameter is set. Is retrieved from the combination score table 91, and the retrieved combination No. The score magnification corresponding to is acquired. Then, the score multiplication obtained in step S192 is added to the total score totaled in step S191 (step S193). After execution of step S193, the process proceeds to step S19 of the first process shown in FIG.

  Then, it is determined whether or not the total value calculated by the total value calculation process of step S18 (the integrated value of the total score and the score magnification) is smaller than the allowable value (step S19). Here, the allowable value is a threshold value for determining whether or not to perform decoding based on the number of customization parameter setting steps, and is a value stored in advance in the flash memory 17. For example, the allowable value is 10, and in step S192 of the total value calculation process, the combination No. in the combination score table 91 is set. 2 is searched. In this case, param-1 (margin check parameter) is “set-2” (2 points), param-2 (character gap parameter) is “set-1” (0 points), and param-3 (delineator parameter). "Set-2" (point 2), param-4 (threshold (magnification) parameter) is "set-1" (point 0), param-5 (threshold (reference position) parameter) is "set-" 1 ”(score 0), param-6 (threshold (monochrome) parameter) is“ set-1 ”(score 0), param-7 (thickness correction parameter) is“ set-1 ”(score 0), param-8 (noise parameter) is “set-1” (point 0), param-9 (character difference parameter) is “set-1” (point 0), param-10 ( Large minimum check parameter) is "set-1" (score 0). Therefore, the total score is “4”. In addition, combination No. Since the point magnification in 2 is 1.0, the total value = 4 × 1.0 = 4. In this case, since the total value “4” is smaller than the allowable value “10”, it is determined as a reliable combination of decoding parameters, and is determined to be decodable.

  For example, in step S192 of the total value calculation process, the combination No. in the combination score table 91 is set. Suppose that 26 is retrieved. In this case, param-1 (margin check parameter) is “set-3” (score 4), param-2 (character gap parameter) is “set-2” (score 3), param-3 (delineator parameter). "Set-1" (point 0), param-4 (threshold (magnification) parameter) is "set-1" (point 0), param-5 (threshold (reference position) parameter) is "set-" 1 ”(score 0), param-6 (threshold (monochrome) parameter) is“ set-1 ”(score 0), param-7 (thickness correction parameter) is“ set-1 ”(score 0), param-8 (noise parameter) is “set-1” (point 0), param-9 (character difference parameter) is “set-1” (point 0), param-10 ( Large minimum check parameter) is "set-1" (score 0). Therefore, the total score is “7”. In addition, combination No. Since the point magnification at 26 is 2.0, the total value = 7 × 2.0 = 14. In this case, since the total value “14” is larger than the allowable value “10”, it is determined that the combination of decoding parameters has a high risk of misreading, and it is determined that decoding is impossible.

  After execution of step S19, decoding is performed reflecting the customized parameters (step S20). Specifically, decoding is executed according to the setting content corresponding to the number of setting steps selected by each decoding parameter. For example, the combination of each decoding parameter is the combination No. Suppose that it corresponds to 2. In this case, the setting content of param-1 (margin check parameter) is “4 times” from “set-2”, and the setting content of param-2 (inter-character gap parameter) is “invalid” from “set-1”. -3 (Delineator parameter) is set to “invalid” from “set-2”, and param-4 (threshold (magnification) parameter) is set to “black * 1.5 white” from “set-1”. * 1.5 ”and param-5 (threshold (reference position) parameter) are set from“ set-1 ”to“ LeftGB: (white + black) / 2 ”, param-6 (threshold (monochrome) parameter) The setting content of “black and white mixed calculation” from “set-1” and the setting content of param-7 (thickening / thinning correction parameter) are set to “no correction” and param-8 from “set-1”. The setting content of “parameter” is “invalid” from “set-1”, and the setting content of param-9 (character difference parameter) is “valid” from “set-1”, and param-10 (maximum / minimum check parameter). ) Is “valid” from “set-1”. The decoding of this step is executed with the setting contents of each decoding parameter.

  Then, it is determined whether or not the decoding result is OK (step S21). Specifically, it is determined whether or not the decoding result is OK based on whether or not the decoding executed in step S20 has been completed (that is, whether or not conversion to any character or numerical value has been completed). . When it is determined that the decoding result is not OK (step S21; NO), the process proceeds to step S15. When it is determined that the decoding result is OK (step S21; YES), it is determined that the reading is OK (step S22). After execution of step S22, the first process is terminated.

  As described above, according to the present embodiment, the scanner unit 16 decodes the read data based on the integrated value of the total score and the score magnification of the decode parameters. Thereby, for example, even for a barcode with poor print quality, the read data is decoded based on the integrated value of the total score and the score magnification of the decode parameter, so that the reliability of decoding can be improved. It is possible to prevent erroneous reading of the barcode. Further, since misreading of bar codes can be prevented, more bar codes can be read.

  Also, if the integrated value of the total score and the point magnification of the decode parameter exceeds the allowable value, the decoding is not executed, and the integrated value of the total score and the point magnification of the decode parameter is within a predetermined allowable value Performs decoding based on the generated combination. As a result, since the decoding of the barcode with low reliability of decoding (that is, the barcode with high possibility of misreading) is not executed, the reliability of decoding can be improved and the misreading of the barcode can be prevented. it can.

  Further, the decoding parameter score is stored in the flash memory 17 in correspondence with each decoding parameter setting stage. Thereby, since the score of each decoding parameter is set according to the setting stage, the reliability of decoding according to each decoding parameter can be reflected in the total value (the integrated value of the total score and the score multiplication factor). it can. As a result, it is possible to improve the degree of freedom for customizing the decoding parameters (combining the decoding parameters) while maintaining the decoding reliability.

  Also, the total value is calculated by integrating the total score and the score magnification. Thereby, since the total value is calculated using the point magnification set for each combination of the decoding parameters, it is possible to accurately calculate the total value. Therefore, the reliability of decoding can be improved.

(Second Embodiment)
A second embodiment according to the present invention will be described with reference to FIGS. Hereafter, the same code | symbol is attached | subjected to the part similar to the barcode reader 1, and the detailed description is used and a different part is demonstrated.

  In the barcode reader 1, the second program is stored in the ROM 15.

The CPU 11 serving as the output means, the first adjustment means, and the first storage control means, in cooperation with the second program stored in the ROM 15, allows the integrated value of the point magnification and the total score of the decode parameters to be an allowable value. The decoded decoding result is output, and based on the output decoding result, the score and the score magnification of the decoding parameter are adjusted, and the adjusted decoding parameter score is stored in the parameter score table 90, The adjusted score magnification is stored in the combined score table 91.
Outputting the decoding result means displaying the decoding result of the read data on the display unit 14. Specifically, adjusting the decoding parameter score and the point magnification based on the output decoding result means that when the displayed decoding result is normal data, the decoding parameter of the decoding parameter at the time of decoding the displayed decoding result is It means lowering the score and the score magnification.

  15 and 16 show the flow of the second process. The second process is a process of displaying the decoding result on the display unit 14 and adjusting the decoding parameter score and the score magnification when there is an input that the displayed data is normal data.

  For example, the second program read out from the ROM 15 and loaded in the RAM 13 as appropriate is triggered by the input of the execution instruction of the second process via the input unit 12, and the CPU 11 performs the second operation. The process is executed.

  Steps S61 to S69 are the same as steps S11 to S19 of the first process. The parameter customization process executed in step S65 is the same as the process executed in steps S151 to S172 of the first process. The total value calculation process executed in step S68 is the same as the process executed in steps S181 to S193 of the first process.

  If it is determined in step S69 that the total value is smaller than the allowable value (step S69; YES), decoding is performed by reflecting the customized parameters (step S70). Then, it is determined whether or not the decoding result is OK (step S71). When it is determined that the decoding result is not OK (step S71; NO), the process proceeds to step S65. If it is determined that the decoding result is OK (step S71; YES), it is determined that the reading is OK (step S72). After execution of step S72, the second process is terminated.

  If it is determined in step S69 that the total value is larger than the allowable value (step S69; NO), decoding is performed by reflecting the customized parameters (step S73). Then, it is determined whether or not the decoding result is OK (step S74). When it is determined that the decoding result is not OK (step S74; NO), the process proceeds to step S65. When it is determined that the decoding result is OK (step S74; YES), the decoded data is displayed on the display unit 14 (step S75). For example, decoded characters and numerical values are displayed on the display unit 14.

  After execution of step S74, the display data displayed on the display unit 14 is in a standby state waiting for input by the user as to whether it is normal data or incorrect data (step S76). Then, it is determined whether or not there is an input indicating normal data (step S77). For example, when the display data displayed on the display unit 14 in step S76 is referred to by the user and is determined to be a normal value, an input indicating a normal result is received via the input unit 12. . On the other hand, when the user determines that the display data is not a normal value, an input indicating that the display data is not a normal value is received via the input unit 12.

  If it is determined in step S77 that there is no input that the result is normal (step S77; NO), the process proceeds to step S65. In step S77, when it is determined that there is an input indicating that the result is normal (step S77; YES), the score and the score magnification for the parameter combination in use are lowered (step S78). For example, in the total value calculation process in step S68, the combination No. Suppose that 26 combinations are retrieved. In this case, if it is determined in step S77 that there is an input indicating that the result is normal, the score and the score magnification for the combination of decoding parameters in use are lowered. For example, at the time of decoding, as shown in FIG. 17A, the score in the set stage number set-3 of param-1 (margin check parameter) in the parameter score table 90 is “4”, param-2 (inter-character gap). It is assumed that the number of points in the setting stage number set-2 of “parameter” is “3”. In this case, as shown in FIG. 17B, the number of points in the set stage number set-3 of param-1 (margin check parameter) in the parameter score table 90 is “3” and param-2 (inter-character gap parameter). The score in the set stage number set-2 is adjusted to “2”. In addition, as shown in FIG. The point magnification at 26 is adjusted from 2.0 to 1.9. The adjusted decoding parameter score is reflected in the parameter score table 90 and the score magnification is reflected in the combination score table 91, and updated. The adjusted parameter score table 90 and the combined score table 91 are used for subsequent barcode reading. And after execution of step S78, it transfers to step S65.

  As described above, according to the present embodiment, when the total value exceeds the allowable value, the decoding result is displayed on the display unit 14. As a result, the user can confirm the decoding result displayed on the display unit 14 and determine whether or not to perform decoding. Therefore, decoding can be performed according to the user's judgment. In addition, since decoding can be performed according to the user's judgment, for example, even when read data is obtained when the calculated total value exceeds the allowable value even though a normal decoding result is obtained. Decoding can be performed, and the barcode reading range can be expanded.

  In addition, after the decoding parameter score and the point magnification are adjusted, decoding can be performed using the adjusted decoding parameter score and the point magnification. As a result, after adjustment of the decoding parameter score and the score magnification, it is possible to perform decoding using the decoding parameter score and the score magnification reflecting the user's judgment.

(Third embodiment)
A third embodiment according to the present invention will be described with reference to FIG. Hereafter, the same code | symbol is attached | subjected to the part similar to the barcode reader 1, and the detailed description is used and a different part is demonstrated.

  In the barcode reader 1, the third program is stored in the ROM 15.

The CPU 11 serving as the second decoding control means, the second adjustment means, and the second storage control means, based on the generated combination in cooperation with the third program stored in the ROM 15, Control whether or not to execute decoding, and when decoding of read data is executed, compare whether or not the decoded decoding result and the decoding result obtained by properly decoding the barcode match, Based on the comparison result, the score and the score magnification of the decoding parameter are adjusted, the adjusted score of the decoding parameter is stored in the parameter score table 90, and the adjusted score magnification is stored in the combination score table 91.
The decoding result obtained by properly decoding the barcode means a correct decoding result when the sample barcode that is a damaged barcode sample can be read correctly (when decoded).
Based on the comparison result, adjusting the decode parameter score and the score multiplication factor is, for example, when the decode result obtained by decoding the read data matches the correct decode result obtained when the sample barcode is read correctly. This means that the decoding parameter score and the point magnification are reduced at the time of decoding. Further, when the decode result obtained by decoding the read data does not match the correct decode result when the sample bar code is read correctly, it means that the decode parameter score and the score magnification at the time of decoding the read data are increased.

  FIG. 19 shows the flow of the third process. The third process controls the decoding execution based on whether or not the decoding parameter customization (combination) has succeeded. When decoding is executed, the decoding parameter is compared with the decoding result of the sample code. Is a process of adjusting the score and the score magnification.

  For example, the third program read from the ROM 15 and appropriately expanded in the RAM 13 is triggered by the input of the execution instruction of the third process via the input unit 12 and the CPU 11 and the third process is executed. The process is executed.

  First, a correct decoding result (characters or numerical values) when a sample barcode as a damage barcode sample is correctly read is stored in the flash memory 17 (step S81). Then, a barcode reading start key is input from the user via the input unit 12, whereby barcode reading is started (step S82). Then, the read data read in step S82 is acquired (step S83). Then, the current combination of customization parameters is initialized (step S84). Then, parameter customization processing is executed (step S85). The parameter customization process is the same as the process executed in steps S151 to S172 of the first process.

  After execution of step S85, it is determined whether or not customization has failed (step S86). When it is determined that the customization has failed (step S86; YES), the third process is terminated.

  If it is determined in step S86 that the customization has been successful (step S86; NO), decoding is performed by reflecting the customized parameters (step S87). Then, it is determined whether or not the decoding result is OK (step S88). If it is determined that the decoding result is not OK (step S88; NO), the process proceeds to step S85. If it is determined that the decoding result is OK (step S88; YES), it is determined whether or not the decoding result decoded in step S87 matches the correct decoding result stored in step S81 (step S89). . Specifically, whether the result decoded in step S87 (for example, character or numerical data) matches the correct decoding result (for example, character or numerical data) stored in the flash memory 17 in step S81. Is determined.

  If it is determined in step S89 that the decoding result matches the correct decoding result (step S89; YES), the score and magnification for the parameter combination in use are lowered (step S90). For example, as described with reference to FIGS. 17 and 18, the decode parameter score and the score multiplication factor are lowered. After execution of step S90, the process proceeds to step S85. If it is determined in step S89 that the decoding result does not match the correct decoding result (step S89; NO), the score and magnification for the parameter combination in use are increased (step S91). That is, the decode parameter score and the score magnification are increased. When the decode parameter score and the score magnification are adjusted (that is, the decode parameter score and the score magnification are increased or decreased), the adjusted decode parameter score is reflected in the parameter score table 90 and the score magnification is reflected in the combination score table 91, respectively. The update is stored. The adjusted parameter score table 90 and the combined score table 91 are used for subsequent barcode reading. And after execution of step S91, it transfers to step S85.

  As described above, according to the present embodiment, it is compared whether or not the decoded decoding result matches the correct decoding result of the barcode (sample code) read in advance, and the decoding parameter score and set score multiplication factor Therefore, accurate decoding can be performed, and misreading of bar codes can be prevented. In addition, since misreading of the bar code can be prevented, the bar code reading range can be expanded.

  In addition, after the decoding parameter score and the point magnification are adjusted, decoding can be performed using the adjusted decoding parameter score and the point magnification. As a result, after adjustment of the decode parameter score and the score magnification, it is possible to perform decoding using the adjusted decode parameter score and score magnification.

  The description in the above embodiment is an example of the code reading apparatus and the program according to the present invention, and the present invention is not limited to this.

For example, in the above embodiment, when the number of setting stages is converted in the decoding parameter customization process, the number of setting stages is set to “+1” (that is, the decoding judgment is loosened). However, the present invention is not limited to this. Absent. For example, the number of set stages may be “−1” (that is, the determination of decoding is strict).
Specifically, for example, “set-2A” and “set-3A” are newly provided in the number of setting stages in param-1 (margin check parameter) of the parameter table 30, and the left and right margin widths in “set-2A” are set. The left and right margin widths in “8 times” and “set-3A” are set to “10 times”. In the parameter score table 90, the score in “set-2A” is “−2”, and the score in “set-3A” is “−4”. In this case, if the decoding decision is changed to be strict, “set-1” → “set-2A” → “set-3A”. Therefore, the magnification representing the left and right margin width is 6 times → 8 times → 10 times, and the determination shifts in a more severe direction. Further, since the score of the decoding parameter is 0 → −2 → −4, the total value of the decoding parameter score calculated as a result decreases. At this time, if the total number of decode parameters is reduced, there is a room for increasing the number of steps for setting other decode parameters. Therefore, other decode parameters may be set loosely.

  Further, the number of setting stages in the parameter score table 90 shown in FIG. 9 is an example, and the present invention is not limited to this. For example, the number of setting steps may be increased or decreased for each decoding parameter.

  Further, although the allowable value is a predetermined value, it is not limited to this. For example, an allowable value may be set by the user.

  In addition, the value of the decoding parameter in each table is an example and is not limited thereto. For example, a value optimized according to the performance and reading environment of the barcode reader 1 and the barcode printing conditions may be used.

  Also, the types of parameters are examples and are not limited thereto. For example, if there are other decoding parameters that may improve the reading performance, these decoding parameters may be added.

  In the above embodiment, the barcode reader 1 reads a barcode, but the present invention is not limited to this. For example, a two-dimensional code may be read.

  In addition, the detailed configuration and detailed operation of the barcode reader 1 in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

It is a figure explaining operation | movement at the time of the barcode reader which concerns on this invention reads a barcode. It is a block diagram which shows the internal structure of a barcode reader. It is a figure which shows a parameter table. (A) is a figure showing an add-on. (B) is a diagram showing a delineator. (A) is a figure which shows the guard bar in the case of an EAN code, a JAN code, and a UPC-A code. (B) is a figure which shows the guard bar in the case of a UPC-E code | cord | chord. (A) is a figure which shows the reference position (left guard bar, center bar) of EAN, JAN, and UPC-A code | cord | chord. (B) is a figure which shows the reference position (left guard bar, right guard bar) of a UPC-E code. (C) is a figure which shows the reference position (start pattern) of an add-on code. (A) is a diagram showing the relationship between the code and the reference position when the threshold (reference position) parameter is “set-1” (LeftGB: (white + black) / 2 StartPattern). (B) is a diagram showing the relationship between the code and the reference position when the threshold (reference position) parameter is “set-2” (CenterGB StartPattern). (C) is a diagram showing the relationship between codes and reference positions when the threshold (reference position) parameter is “set-3” (LeftGB: (white + black) StartPattern). (A) is a diagram showing the relationship between codes and reference positions when the threshold (reference position) parameter is “set-4” (LeftGB: (white + black) / 2 WPC section). (B) is a diagram showing the relationship between the code and the reference position when the threshold (reference position) parameter is “set-5” (CenterGB: WPC section). (C) is a diagram showing the relationship between the code and the reference position when the threshold (reference position) parameter is “set-6” (LeftGB: (white + black): WPC section). It is a figure which shows a parameter score table. It is a figure which shows a combination score table. It is a flowchart which shows a 1st process. It is a flowchart which shows a parameter customization process. It is a flowchart which shows a parameter customization process. It is a flowchart which shows a total value calculation process. It is a flowchart which shows a 2nd process. It is a flowchart which shows a 2nd process. (A) is a figure which shows the parameter score table before parameter adjustment. (B) is a figure which shows the parameter score table after parameter adjustment. It is a figure which shows that the point magnification was adjusted. It is a flowchart which shows a 3rd process.

Explanation of symbols

1 Bar code reader 11 CPU
12 Input unit 13 RAM
14 Display 15 ROM
16 Scanner 17 Flash memory 18 Power supply 19 Bus

Claims (7)

Reading means for reading a data code indicating a bar code or a two-dimensional code and outputting the read read data;
Decoding means for decoding the read data output by the reading means;
Reliability information storage means for storing reliability information representing reliability of decoding for each of a plurality of decoding parameters used at the time of decoding by the decoding means;
Combination storage means for storing combination information in which the plurality of decoding parameters are combined;
Generating means for generating a combination of the plurality of decoding parameters;
Based on the combination generated by the generation unit, the reliability information corresponding to each decoding parameter is acquired from the reliability information storage unit, and a calculation unit that calculates the total of the acquired reliability information;
The combination information corresponding to the combination generated by the generation unit is acquired from the combination storage unit, and read by the reading unit based on the acquired combination information and the total calculated by the calculation unit. Determination information calculating means for calculating determination information for determining whether to decode the read data;
First decoding control means for controlling whether to cause the decoding means to execute decoding based on the judgment information calculated by the judgment information calculating means;
A code reader comprising: The first decoding control means includes:
When the determination information exceeds a predetermined allowable value, the decoding unit does not execute decoding. When the determination information is within the predetermined allowable value, the determination unit is based on the combination generated by the generation unit. The code reading device according to claim 1, wherein the decoding unit executes decoding. The reliability information storage means includes
The code reading device according to claim 1, wherein a plurality of parameter setting steps are provided for each decoding parameter, and the reliability information is stored corresponding to each parameter setting step. The combination information is
Including magnification information set for each combination of the plurality of decoding parameters;
The determination information calculation means includes
The code reading device according to claim 1, wherein the determination information is calculated by integrating the magnification information and the total. When the determination information calculated by the determination information calculation means exceeds a predetermined allowable value, output means for outputting a decoding result decoded by the decoding means;
First adjustment means for adjusting the reliability information and the combination information based on the decoding result output by the output means;
First storage control for storing reliability information adjusted by the first adjustment unit in the reliability information storage unit, and storing combination information adjusted by the first adjustment unit in the combination information storage unit Means,
The code reading device according to claim 1, further comprising: Second decoding control means for controlling whether to cause the decoding means to execute decoding based on the combination generated by the generating means;
When the decoding of the decoding means is executed by the second decoding control means, the decoded result is compared with whether or not the decoded result in which the data code is properly decoded matches, and the comparison result Based on the second adjustment means for adjusting the reliability information and the combination information;
Second storage control for storing reliability information adjusted by the second adjustment unit in the reliability information storage unit and storing combination information adjusted by the second adjustment unit in the combination information storage unit Means,
The code reading device according to any one of claims 1 to 4, further comprising: Computer
Reading means for reading a data code indicating a bar code or a two-dimensional code and outputting the read data;
Decoding means for decoding the read data output by the reading means;
Reliability information storage means for storing reliability information representing reliability of decoding for each of a plurality of decoding parameters used at the time of decoding by the decoding means;
Combination storage means for storing combination information in which the plurality of decoding parameters are combined;
Generating means for generating a combination of the plurality of decoding parameters;
Calculation means for acquiring the reliability information corresponding to each decoding parameter from the reliability information storage means based on the combination generated by the generation means, and calculating the total of the acquired reliability information;
The combination information corresponding to the combination generated by the generation unit is acquired from the combination storage unit, and read by the reading unit based on the acquired combination information and the total calculated by the calculation unit. Determination information calculating means for calculating determination information for determining whether to decode the read data;
First decoding control means for controlling whether or not to cause the decoding means to perform decoding based on the judgment information calculated by the judgment information calculating means;
Program to function as.

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