WO2017077721A1 - Procédé et dispositif de génération de code bidimensionnel, programme, code bidimensionnel, procédé et dispositif de lecture de code bidimensionnel et système de gestion de code bidimensionnel - Google Patents

Procédé et dispositif de génération de code bidimensionnel, programme, code bidimensionnel, procédé et dispositif de lecture de code bidimensionnel et système de gestion de code bidimensionnel Download PDF

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WO2017077721A1
WO2017077721A1 PCT/JP2016/056819 JP2016056819W WO2017077721A1 WO 2017077721 A1 WO2017077721 A1 WO 2017077721A1 JP 2016056819 W JP2016056819 W JP 2016056819W WO 2017077721 A1 WO2017077721 A1 WO 2017077721A1
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code
protection
block
code block
dimensional code
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PCT/JP2016/056819
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Japanese (ja)
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傳生 西▲崎▼
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株式会社トッパンＴｄｋレーベル
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light

Definitions

  • the present invention relates to a two-dimensional code generation method, a two-dimensional code generation device, a program, a two-dimensional code, a two-dimensional code reading method, a two-dimensional code reading device, and a two-dimensional code management system.
  • the present invention has been made in view of the above-described problems, and its main purpose is to appropriately protect confidential information using a two-dimensional code.
  • the main invention is Obtaining a protection encoding code block by performing protection encoding of the code block by exclusive OR operation in units of bits of a code block having a data code word and a protection encoding pattern; Generating a two-dimensional code based on the protected encoded code block;
  • a two-dimensional code generation method characterized by including:
  • FIG. 4 is an explanatory diagram of a QR code symbol 1;
  • FIG. 2 is a block diagram of an extension encoder 10.
  • FIG. It is explanatory drawing of the QR code symbol production
  • 3 is a block diagram of an extension decoder 20.
  • FIG. It is explanatory drawing of the QR code symbol reading process in 1st Embodiment. It is a flowchart of the QR code symbol reading process in the first embodiment.
  • a two-dimensional code generation method comprising:
  • a protection encoding code block is obtained by performing a protection encoding of the code block by an exclusive OR operation in units of bits of a code block having a data code word and a protection encoding pattern, and the protection encoding code block is obtained.
  • a two-dimensional code generation device characterized in that a two-dimensional code is generated based on the two-dimensional code.
  • Obtaining a protection encoding code block by performing protection encoding of the code block by exclusive OR operation in units of bits of a code block having a data code word and a protection encoding pattern; Generating a two-dimensional code based on the protected encoded code block; A program characterized by causing a computer to execute.
  • a protection coding code block is obtained by performing protection coding of the code block by exclusive OR operation of a code block having a data code word and a protection coding pattern in bit units, and the protection coding code block A two-dimensional code generated based on
  • a protection coding code block is obtained by performing protection coding of the code block by exclusive OR operation of a code block having a data code word and a protection coding pattern in bit units, and the protection coding code block Reading the two-dimensional code generated based on Obtaining the protected encoded code block from the two-dimensional code; Obtaining the code block obtained by protection decoding the protection coding code block by an exclusive OR operation in bit units of the protection coding code block and the protection coding pattern; Extracting the data code word from the code block;
  • a two-dimensional code reading method comprising:
  • a protection coding code block is obtained by performing protection coding of the code block by exclusive OR operation of a code block having a data code word and a protection coding pattern in bit units, and the protection coding code block Read the two-dimensional code generated based on Obtaining the protected encoded code block from the two-dimensional code; Obtaining the code block obtained by protection-decoding the protection coding code block by exclusive OR operation in bit units of the protection coding code block and the protection coding pattern; A two-dimensional code reading apparatus, wherein the data code word is extracted from the code block.
  • a protection coding code block is obtained by performing protection coding of the code block by exclusive OR operation of a code block having a data code word and a protection coding pattern in bit units, and the protection coding code block Reading the two-dimensional code generated based on Obtaining the protected encoded code block from the two-dimensional code; Obtaining the code block obtained by protection decoding the protection coding code block by an exclusive OR operation in bit units of the protection coding code block and the protection coding pattern; Extracting the data code word from the code block; A program characterized by causing a computer to execute.
  • a protection encoding code block is obtained by performing a protection encoding of the code block by an exclusive OR operation in units of bits of a code block having a data code word and a protection encoding pattern, and the protection encoding code block is obtained.
  • a two-dimensional code generation device for generating a two-dimensional code based on the same; The generated two-dimensional code is read, the protection encoding code block is obtained from the two-dimensional code, and the protection encoding code block and the protection encoding pattern are subjected to exclusive OR operation in bit units.
  • a two-dimensional code reading device for obtaining the code block obtained by performing protection decoding on the protection encoded code block, and extracting the data code word from the code block;
  • a two-dimensional code management system comprising:
  • JIS standard Japanese Industrial Standard JIS X 0510: 2004 "Two-dimensional code symbol-QR code” (hereinafter sometimes simply referred to as "JIS standard").
  • JIS standard An encoder that conforms to the JIS standard is referred to as a standard encoder, and a decoder that conforms to the JIS standard is referred to as a standard decoder.
  • an encoder that can perform the protection coding process shown below is called an extension encoder, and a decoder that can perform the protection decoding process is called an extension decoder. And these are distinguished.
  • the “protective coding pattern” is a so-called protective mask pattern used when performing protective coding using exclusive OR for the purpose of preventing reading, and is a standard in the JIS standard. It is different from the mask pattern.
  • the mask pattern defined in the JIS standard is expressed as a “standard mask pattern” in order to distinguish it from this “protective coding pattern”.
  • the “code word” is described as having an 8-bit length. However, depending on the system, the “code word” may be a 16-bit length, or may have another length such as a 1-bit length. You can also.
  • FIG. 1 is an explanatory diagram of the QR code symbol 1.
  • QR code symbol 1 (hereinafter, sometimes simply referred to as “QR code”) is available in various sizes from type 1 to type 40.
  • model number “2” is taken as an example for each function. Will be described.
  • QR code symbol 1 has a function pattern and a coding area.
  • the function pattern is a pattern necessary for searching a QR code symbol position and identifying a characteristic necessary for assisting decoding in a QR code module.
  • the encoding area is an area where necessary information is written.
  • the function pattern includes a position detection pattern FP, a separation pattern SP, a timing pattern TP, an alignment pattern AP, and a quiet zone QZ.
  • the position detection pattern FP is a pattern arranged at at least three corners of the QR code. At the time of reading, by identifying the three position detection patterns FP, the direction and position of the QR code symbol 1 can be correctly recognized.
  • the separation pattern SP is a light module having a width of 1 module arranged around the position detection pattern FP. As a result, the position detection pattern FP can be distinguished from the QR code symbol 1.
  • Module M is a unit cell constituting QR code symbol 1. In principle, one bit corresponds to one module.
  • a group of a plurality of modules M, which are unit cells constituting the QR code, is referred to as a module group.
  • the timing pattern TP is a pattern in which dark modules and bright modules are alternately arranged in a straight line one module at a time. Since the number of modules of the QR code symbol 1 can be recognized by the timing pattern TP, it is possible to identify the QR code model number.
  • the alignment pattern AP is a pattern arranged at a position determined by the QR code model number.
  • the alignment pattern AP serves to assist the search for the position of the QR code symbol 1 in the case of a large module.
  • the quiet zone QZ is a bright module area of at least 4 modules wide provided around the QR code.
  • the encoding area has data, an error correction code word (hereinafter sometimes simply referred to as “correction code word”), and format information FI.
  • the model number information VI is also added to a large model number.
  • the format information FI includes information on an error correction level and a standard mask pattern. Standard mask pattern information is represented by a mask pattern reference. Note that protection coding using a standard mask pattern and a protection coding pattern, which will be described later, is applied only to a region excluding the format information FI and the model number information VI in the coding region.
  • the data and error correction code words are arranged as error correction code words for error correction when actual data and data cannot be read.
  • the format information has information on the error correction level applied to the QR code symbol 1 and the standard mask pattern to be used, and is a coding pattern necessary for decoding the coding region.
  • FIG. 2 is a block diagram of the extension encoder 10 (corresponding to a two-dimensional code generation device).
  • the extension encoder 10 is a QR code symbol 1 generating device capable of performing a QR code symbol generating process to be described later.
  • the extension encoder 10 includes a control unit 11, a display device 13, a printing device 14, and an input device 15.
  • the control unit 11 includes a calculation unit 11a and a storage unit 11b.
  • the calculation unit 11a is composed of a central processing unit and the like, and is responsible for program execution and various calculations.
  • the storage unit 11b is responsible for storing necessary data when executing the program. In particular, the storage unit 11b stores a program for executing a QR code generation process to be described later.
  • the display device 13 has a display function necessary for data input and the like.
  • the display device 13 outputs the generated QR code symbol 1 by display.
  • the printing device 14 also outputs the generated QR code symbol 1 by printing.
  • the input device 15 is used for data input and operation of the extension encoder 10.
  • the configuration of the extension encoder 10 can be realized by installing a program for executing a protection encoding process, which will be described later, in a general computer, a mobile phone, a smartphone, or the like.
  • FIG. 3 is an explanatory diagram of the extended QR code symbol generation process in the first embodiment.
  • FIG. 4 is a flowchart of extended QR code symbol generation processing in the first embodiment.
  • a protection encoding process is performed on an RS block (corresponding to a “code block”) to make it difficult for a third party to read. Therefore, the QR code symbol generated here is referred to as an extended QR code symbol (sometimes simply referred to as a QR code symbol).
  • the extended QR code symbol generation process will be described with reference to these drawings.
  • the information body embedded in the QR code symbol 1 is captured (S102).
  • the information main body may be taken in via the input device 15, or information stored in advance in the storage unit 11b may be used.
  • the QR code symbol 1 has a total number of code words determined according to the model number.
  • the total number of code words is the sum of the number of data code words including the number of information body words and the number of correction code words.
  • the size and number of RS blocks made up of data code words and correction code words are determined according to the model number of the QR code symbol 1. Error correction is performed in units of RS blocks.
  • the error correction level is “H” and the model number is “4”
  • the total number of code words is set to “100”.
  • the number of data code words in one RS block is “9”, and the number of correction code words is “16”.
  • the RS block is a block composed of a data code word and a Reed-Solomon code (hereinafter sometimes referred to as “RS code”) as defined in the JIS standard.
  • the data code word includes an information body, a terminal code, and a padding code word.
  • other information defined in the JIS standard may be included.
  • the RS code is a correction code for performing error correction of the RS block.
  • the RS code used here is also defined by the JIS standard.
  • the code word of the information body is divided into a plurality of blocks. Then, an error correction word is generated for each block, and the generated correction code word is added after the corresponding code word to generate an RS block.
  • the value of the mask pattern reference MPR is initialized to “0” (S108).
  • the value of the mask pattern reference MPR has a numerical value from 0 to 7 (“000” to “111”). Therefore, here, the value of the mask pattern reference child MPR is changed from 0 to 7, and the processing from step S110 to step S116 described later is repeatedly performed. Therefore, the value of the mask pattern reference MPR is initialized to “0”.
  • the protection coding pattern is a pattern used for the above-described RS block protection coding.
  • the protection coding pattern is used to perform exclusive OR with a bit string in the RS block by a process to be described later. Therefore, the protection coding pattern is also a pattern composed of a bit string.
  • the protection coding pattern is stored in the storage unit 11b in advance.
  • this protection coding pattern may be changed for each customer (company), or the customer (company) It may be a unified (unique) value regardless of the company.
  • FIG. 3 shows a state in which an exclusive OR in the bit unit between the RS block and the protection coding pattern is calculated, and the RS block after protection coding is generated.
  • the RS block is subjected to protection coding by the protection coding pattern.
  • protection coding is performed on all these RS blocks. Since exclusive OR is performed in bit units in this way, the protection encoding process and the protection decoding process described later can be made a common process for calculating the exclusive OR. .
  • the RS block after protection coding is used, and a QR code symbol is generated according to the configuration method defined in the JIS standard (S114).
  • the QR code symbols generated here are those before application of the standard mask pattern according to the JIS standard.
  • the QR code symbol generation method before applying the standard mask pattern conforms to the JIS standard and will not be described in detail.
  • each bit of the RS block after protection coding is converted into a module, and these modules are arranged at corresponding positions. Will be.
  • the plurality of modules are a module group, and a standard mask pattern to be described later is applied to the module group.
  • the standard mask pattern specified by the mask pattern reference MPR is applied to the generated QR code symbol (S116).
  • the application of the standard mask pattern will not be described in detail because it conforms to the JIS standard, but as a result, the standard mask pattern is applied to the module group as described above.
  • step S118 it is determined whether or not the value of the mask pattern reference child MPR is 7 (S118). Thus, it is determined whether or not the processing from step S110 to step S114 has been performed for all cases where the value of the mask pattern reference child MPR is 0 to 7. If the value of the mask pattern reference MPR is not 7 in step S118, the value of the mask pattern reference MPR is incremented (S120).
  • step S118 if the value of the mask pattern reference MPR is “7” in step S118, all the QR codes when the value of the mask pattern reference MPR is changed from 0 to 7 in the processing so far. A symbol has been generated. Therefore, these eight QR code symbols are evaluated, and an optimum QR code symbol is specified (S122).
  • the evaluation of the QR code symbol in step S122 is omitted because “evaluation of the mask processing result” in the JIS standard is applied. By performing this evaluation process, QR code symbols with moderately varying modules are identified.
  • step S122 eight types of QR code symbols are stored together and evaluated in step S122. However, evaluation processing is performed each time a QR code symbol is generated. It may be done. The evaluation value of the QR code symbol generated this time may be compared with the evaluation value of the QR code symbol based on the value of the previous mask pattern reference MPR. Then, only QR code symbols having good evaluation values may be stored, and QR code symbols may be generated and evaluated based on the value of the next mask pattern reference child MPR, and evaluation values may be compared. In this way, the storage capacity can be saved.
  • step S122 the QR code symbol specified in step S122 is output (S124).
  • the output of the QR code symbol may be displayed on the display device 13 or may be printed by the printing device 14.
  • the application of the standard mask pattern can be performed before the post-protection-encoded RS block generation processing in step S112.
  • FIG. 5 is a block diagram of the extension decoder 20 (corresponding to a two-dimensional code reader).
  • the extended decoder 20 is a reading device that can perform the reading process of the above-described extended QR code symbol.
  • the extended decoder 20 includes a control unit 21, an imaging device 22, a display device 23, a printing device 24, and an input device 25. Note that a general QR code reader cannot perform the later-described protection decoding process, and therefore cannot appropriately read the extended QR code symbol.
  • the extension encoder 10 and the extension decoder 20 described above constitute a two-dimensional code management system.
  • the control unit 21 includes a calculation unit 21a and a storage unit 21b.
  • the calculation unit 21a is composed of a central processing unit and the like, and is responsible for program execution and various calculations.
  • the storage unit 21b is responsible for storing necessary data when executing the program. In particular, the storage unit 21b stores a program for executing a QR code reading process to be described later.
  • the imaging device 22 is a device for imaging an extended QR code symbol, and is, for example, a CCD camera.
  • the display device 23 has a display function necessary for data input and the like.
  • the display device 23 outputs the information developed from the QR code by display.
  • the printing device 24 also outputs the developed information by printing.
  • the input device 25 is used for data input and operation of the extension decoder 20.
  • the extended decoder 20 includes the imaging device 22, the extended decoder 20 is not necessarily a dedicated device, but can be used to execute an extended QR code symbol reading process, which will be described later, on a general computer, mobile phone, and smartphone. This can be realized by installing a program. Further, the extension encoder 10 and the extension decoder 20 described above can be integrated and realized.
  • FIG. 6 is an explanatory diagram of the extended QR code symbol reading process in the first embodiment.
  • FIG. 7 is a flowchart of the extended QR code symbol reading process in the first embodiment.
  • the QR code symbol reading process will be described with reference to these drawings.
  • an extended QR code symbol is read (S202).
  • the mask pattern reference MPR is read from the read format information FI of the extended QR code symbol (S204).
  • the applied standard mask pattern is specified based on the value of the mask pattern reference MPR, and the standard mask pattern is canceled using this standard mask pattern (S206). Since the standard mask pattern specifying method and the canceling method conform to the JIS standard, description thereof is omitted. As a result, the aforementioned module group is obtained.
  • a plurality of post-protection-encoded RS blocks are developed from the extended QR code symbol module group from which the standard mask pattern is released (S208).
  • a technique similar to the development of the RS block in the JIS standard can be adopted. Thereby, for example, the post-protection-encoded RS block shown in FIG. 6 described above is acquired.
  • a protection coding pattern is fetched from the storage unit 21b (S210).
  • This protection coding pattern is the same pattern as that recorded in the storage unit 11b of the extension encoder 10 described above.
  • This step S210 is executed when the read QR code symbol cannot be extracted from the data code word by the standard decoding process.
  • the QR code symbol in this case cannot be extracted by a normal decoder (standard decoding means).
  • the process of step S210 is performed only when an attempt is made to read a QR code symbol that has been subjected to protection coding by the protection coding pattern as in the present embodiment, and otherwise standard decoding processing is performed. Will be done.
  • the protection coding pattern is stored in the storage unit 21b in advance.
  • this protection coding pattern may be changed for each customer (company), or the customer (company) It may be a unified (unique) value regardless of the company.
  • the extension encoder 10 and the extension decoder 20 are integrated and realized, the protection coding pattern may be recorded in one (common) storage unit.
  • the generated protection coding pattern is used, and protection decoding of the RS block after protection coding is performed (S212).
  • the exclusive OR of the protection-encoded RS block and the protection coding pattern is calculated, and the protection-decoded RS block (that is, the RS block before the protection coding) is generated. Is shown. Although there are a plurality of post-protection-encoded RS blocks in most cases, protection decoding is performed on all of these post-protection-encoded RS blocks.
  • data code words are extracted from the RS block (S214).
  • error correction using an RS code is also performed.
  • error correction even if the data code word is contaminated, it can be restored to the original data code word.
  • the restored data code word is extracted. This is because even if there is a reading error due to contamination or the like, even if a protective decoding operation using a protective coding pattern is performed due to the characteristic of the exclusive OR operation, this error is detected at the same position in the original code word. This is because the bit remains in the bit and is appropriately corrected by the error correction code.
  • the information body included in the extracted data code word is output (S216).
  • the image can be displayed on the display device 23 or can be printed on the printing device 24.
  • the two-dimensional code generation method uses the code block (RS) by the exclusive OR operation in bit units of the code block (RS block) having the data code word and the protection coding pattern.
  • (Block) is subjected to protection encoding to obtain a protection encoding code block (an RS block after protection encoding), and a two-dimensional code is generated based on the protection encoding code block (an RS block after protection encoding). And so on.
  • the extension encoder 10 protects the code block (RS block) by performing an exclusive OR operation in units of bits of the code block (RS block) having the data code word and the protection coding pattern. Encoding is performed to obtain a protection encoding code block (an RS block after protection encoding), and a two-dimensional code is generated based on the protection encoding code block (an RS block after protection encoding).
  • the program according to the present embodiment performs protection coding of a code block (RS block) by exclusive OR operation in bit units of a code block (RS block) having a data code word and a protection coding pattern.
  • a protection coding code block an RS block after protection coding
  • a two-dimensional code based on the protection coding code block (an RS block after protection coding). I decided to make it.
  • the two-dimensional code protects the code block (RS block) by performing an exclusive OR operation on a bit basis between the code block (RS block) having the data code word and the protection coding pattern. Encoding is performed to obtain a protection encoding code block (an RS block after protection encoding), and it is generated based on the protection encoding code block (an RS block after protection encoding).
  • the two-dimensional code reading method is a code block (RS block) obtained by performing an exclusive OR operation on a bit basis between a code block having a data code word (RS block) and a protection coding pattern.
  • a protection encoding code block (an RS block after protection encoding) is obtained, and a two-dimensional code generated based on the protection encoding code block (an RS block after protection encoding) is read.
  • Obtaining a protection encoding code block (an RS block after protection encoding) from the two-dimensional code, and exclusive protection in bit units between the protection encoding code block (an RS block after protection encoding) and the protection encoding pattern Code block (protection-decoded code block (RS block after protection encoding) by logical OR operation) was to contain and to determine the S block), and extracting the data code word from the code block (RS blocks), the.
  • the extended decoder 20 protects the code block (RS block) by performing an exclusive OR operation on a bit basis between the code block having the data code word (RS block) and the protection coding pattern.
  • Encoding is performed to obtain a protection encoding code block (an RS block after protection encoding), a two-dimensional code generated based on the protection encoding code block (an RS block after protection encoding) is read, and the two-dimensional code is read
  • a protection coding code block (an RS block after protection coding) is obtained from the code, and a protection code is obtained by exclusive OR operation in bit units between the protection coding code block (an RS block after protection coding) and the protection coding pattern.
  • a code block (RS block) obtained by protection decoding of the coded code block (RS block after protection coding), It decided to extract the data code word from Doburokku (RS blocks).
  • the program according to the present embodiment performs protection coding of a code block (RS block) by exclusive OR operation in bit units of a code block (RS block) having a data code word and a protection coding pattern.
  • a protection encoded code block an RS block after protection encoding
  • a two-dimensional code A protection coding code block (an RS block after protection coding) is obtained from the above, and an exclusive OR operation in bit units of the protection coding code block (an RS block after protection coding) and the protection coding pattern Code block (RS block) obtained by protection decoding of protection coding code block (RS block after protection coding) And determining, and extracting the data code word from the code block (RS blocks), was used as that causing a computer.
  • the two-dimensional code management system includes a code block (RS block) obtained by performing an exclusive OR operation on a bit basis between a code block (RS block) having a data code word and a protection coding pattern.
  • the generated two-dimensional code is read, a protection encoding code block (an RS block after protection encoding) is obtained from the two-dimensional code, and a protection encoding code block (an RS block after protection encoding) and a pattern for protection encoding Protection coding code block (RS block after protection coding) is protected by exclusive OR operation in bit units Seeking Goka the code blocks (RS blocks), from the code block (RS blocks) and extended decoder 20 to extract the data code word, was to have.
  • a general QR code reading apparatus since a protection coding pattern is applied to the generated two-dimensional code (extended QR code symbol), a general QR code reading apparatus uses a protection decoding process. Cannot be performed, and even a two-dimensional code (extended QR code symbol) cannot be read. That is, the generated two-dimensional code (extended QR code symbol) cannot be read by a normal decoder even if it has a form that is not different from a normal (non-extended) QR code. Therefore, it is possible to protect the information to be concealed more appropriately than in the example in which the information code word itself is encrypted.
  • protection encoding protection decoding
  • code block protection encoding code block
  • protection encoding pattern in units of bits
  • a standard QR code has been described as an example of a two-dimensional code.
  • the present invention is not limited to this, and International Publication Nos. 2015/64334 and 2009-9547.
  • An extended QR code as described in the publication may be used.
  • the code is not limited to the QR code, and other two-dimensional codes (for example, DataMatrix, PDF417, etc.) may be used.
  • the present invention can be applied to any of these two-dimensional codes.
  • the protective coding pattern is stored in advance in the storage unit 11b (storage unit 21b).
  • the present invention is not limited to this.
  • a function for generating a protection coding pattern is recorded in the storage unit 11b (storage unit 21b), and the input value (pass code) input by the user is substituted into the function to perform the protection coding.
  • An industrial pattern may be generated.
  • a value of a trigonometric function SIN (n) is obtained by using an ASCII numeric character string as an input value and n as a decimal number, and this absolute value (the SIN function is a value between ⁇ 1 and +1). Function that outputs numbers after the decimal point as a hexadecimal sequence of the required length " For example, the information character string to be protected and input and the input value are as follows.
  • the information character string “Hello” was “0x48656C6C6F” in hexadecimal notation.
  • the output value (protective coding pattern) was “0x8191520442” in hexadecimal notation. Taking the logical exclusive sum (XOR) of these two results in “0xC9F43E682D”. That is, by the above-described protection encoding process, the information character string “Hello” is protection-encoded into a data code word “0xC9F43E682D” which has no meaning at all.
  • the trigonometric function (SIN function) has been described as an example of the function.
  • the function is not limited to this.
  • a pseudo random number generation function SHA-1, MD5, etc.
  • a cryptographic function SHA-1, MD5, etc.
  • DES conversion function
  • AES AES
  • a mathematical function logarithmic function, etc.
  • the input value may be determined in advance for each customer (company).

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Abstract

L'invention concerne un procédé de génération de code bidimensionnel comprenant : l'exécution d'un codage de protection d'un bloc de code comprenant des mots de code de données et l'obtention d'un bloc de code codé de protection, par l'exécution d'une opération OU-exclusif (XOR) sur chaque bit du bloc de code et d'un motif de codage de protection ; et la génération d'un code bidimensionnel en fonction du bloc de code codé de protection.
PCT/JP2016/056819 2015-11-05 2016-03-04 Procédé et dispositif de génération de code bidimensionnel, programme, code bidimensionnel, procédé et dispositif de lecture de code bidimensionnel et système de gestion de code bidimensionnel WO2017077721A1 (fr)

Applications Claiming Priority (2)

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JP2015-217390 2015-11-05
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005066884A1 (fr) * 2003-12-26 2005-07-21 Wireaction Inc. Systeme de code a barres bidimensionnel procede et logiciel pour creer de code a barres bidimensionnel
JP2009099091A (ja) * 2007-10-19 2009-05-07 Denso Wave Inc 光学的情報読取装置および光学的情報読取システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005066884A1 (fr) * 2003-12-26 2005-07-21 Wireaction Inc. Systeme de code a barres bidimensionnel procede et logiciel pour creer de code a barres bidimensionnel
JP2009099091A (ja) * 2007-10-19 2009-05-07 Denso Wave Inc 光学的情報読取装置および光学的情報読取システム

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