JP2023073847A - Computer program, authenticity determination device, and authenticity determination method - Google Patents

Abstract

To provide a computer program, an authenticity determination device, and an authenticity determination method capable of accurately performing authenticity determination for an identification certificate or the like.SOLUTION: A computer program executes processes of: acquiring an image of an object medium; specifying a determination object image on the basis of the acquired image; applying a prescribed image process to the specified determination object image; extracting identifying information on the basis of the image processed determination object image; and determining authenticity of the object medium on the basis of the extracted identifying information.SELECTED DRAWING: Figure 1

Description

The present invention relates to a computer program, an authenticity determination device, and an authenticity determination method.

Consumer printers (e.g., dye-sublimation, inkjet, etc.) have made it possible to create duplicates and counterfeits of ID cards that are difficult to distinguish visually, and detection of these duplicates and counterfeits has become an issue. . As anti-duplication techniques, there have been proposed methods such as holograms, which are difficult to duplicate and can be identified at first glance, and embedding of IC chips, etc., which cannot be duplicated with a printer.

Patent Document 1 discloses an anti-counterfeit sheet on which microcharacters are printed, which makes it possible to easily visually identify that an image has been forged by copying.

JP-A-6-183192

However, in order to detect the microcharacters, it is necessary to know in advance where the microcharacters are printed, and image processing for recognizing the microcharacters is also necessary. Therefore, when determining the authenticity of an ID card or the like based on whether or not microcharacters are readable, there is a concern that the authenticity determination cannot be performed with high accuracy unless appropriate image processing is performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a computer program, an authenticity determination device, and an authenticity determination method capable of accurately determining the authenticity of an ID card or the like.

The present application includes a plurality of means for solving the above problems. To give an example, a computer program acquires an image of a target medium in a computer, specifies a determination target image based on the acquired image, Performing predetermined image processing on the identified determination target image, extracting identification information based on the determination target image after the image processing, and determining the authenticity of the target medium based on the extracted identification information. Let

According to the present invention, it is possible to accurately determine the authenticity of an ID card or the like.

It is a figure which shows an example of a structure of an authenticity determination apparatus. It is a figure which shows typically the mode of authenticity determination of an ID card. It is a figure which shows an example of an evaluation parameter. It is a figure which shows an example of authenticity determination by the character recognition result of the determination part of an ID card. It is a figure which shows an example of the authenticity determination process by an authenticity determination apparatus. It is a figure which shows an example of the authenticity determination process by an authenticity determination apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on the drawings showing its embodiments. FIG. 1 is a diagram showing an example of the configuration of the authenticity determination device 50. As shown in FIG. The authenticity determination device 50 includes a control unit 51 that controls the entire device, a communication unit 52, a memory 53, an image capturing unit 54, a display unit 55, a card face determination unit 56, an image processing unit 57, a processing result evaluation unit 58, and a storage unit. A portion 59 is provided. Storage unit 59 stores computer program 60 . An evaluation parameter data server 100 is connected to the authentication device 50 via the communication network 1 . The authenticity determination device 50 may be composed of, for example, a smart phone or a tablet terminal.

The control unit 51 is configured by incorporating a required number of CPUs (Central Processing Units), MPUs (Micro-Processing Units), GPUs (Graphics Processing Units), and the like. Further, by executing the computer program 60, the control unit 51 can implement the functions of the card surface discrimination unit 56, the image processing unit 57, the processing result evaluation unit 58, etc., with software instead of hardware. can be done. The computer program 60 may be downloaded via the communication section 52 and stored in the storage section 59 .

The communication unit 52 includes, for example, a communication module and has a function of communicating with the evaluation parameter data server 100 via the communication network 1 . Also, the communication unit 52 may have a communication function with an external device (not shown) connected to the communication network 1 .

The memory 53 can be composed of a semiconductor memory such as an SRAM (Static Random Access Memory), a DRAM (Dynamic Random Access Memory), or a flash memory. By deploying the computer program 60 in the memory 53 , the control unit 51 can execute the computer program 60 .

The image capturing unit 54 has a camera and can acquire an image of the target medium. The target medium is the object of authenticity judgment, and the holder and issuer of the card, such as an ID certificate and an ID card, that can record the input data necessary for transaction processing when using the card. including a card that identifies the The card name, card issuer name, card holder name, card number, expiration date, etc. are printed, printed, or described by a predetermined method on the face of the card (front side or back side). In addition, a specific parameter for each type of card is written at a specific location on the face of the card. The parameters are written in micro-characters and used to determine the authenticity of the target medium. Microcharacters are, for example, characters with a size of about 300 μm, and cannot be reproduced by an inkjet printer, a sublimation transfer printer, or the like. The target medium is also referred to herein as a card or an ID card.

The display unit 55 includes a liquid crystal display panel, an organic EL display panel, or the like, and can display the processing result by the authenticity determination device 50 .

The storage unit 59 can be configured by, for example, a hard disk or a semiconductor memory, and can store required information.

The card face discriminating unit 56 discriminates the card type and front and back sides. The card face determination unit 56 acquires evaluation parameters from the evaluation parameter data server 100 according to the type of card determined. Details of the evaluation parameters will be described later.

The image processing unit 57 cuts out the ID card portion from the acquired image, and cuts out a determination target image including microcharacters from the cut out image of the ID card portion. The image processing unit 57 performs predetermined image processing (conversion processing) on the cut-out determination target image so that microcharacters can be appropriately recognized. That is, the image processing unit 57 has functions as a specifying unit and an extracting unit, specifies a determination target image based on the image acquired by the image capturing unit 54, and performs predetermined image processing on the specified determination target image. I do. Predetermined image processing may include, for example, at least one of grayscale conversion, rotation, enlargement, and edge enhancement. Grayscale conversion is a conversion for expressing a color image in white, black, and colors in between (gray). Character recognition accuracy can be improved by emphasizing the difference between the font of the microcharacters and the background (for example, color, pattern, etc.). Rotation can specify the height (character size) of microcharacters by recognition area information after character recognition is performed by aligning the direction of the character string of microcharacters in one required direction. Edge enhancement can enhance the edge portions of microcharacters, and can improve character recognition accuracy. It is particularly preferable to use rotation processing in the predetermined image processing. The direction of the character string in which the character string of the micro character is printed and the height (character size) of the micro character are important information for authenticity judgment, and it is necessary to obtain this information correctly by the rotation process. This is because

The image processing unit 57 extracts identification information by performing character recognition processing on the determination target image after image processing.

The processing result evaluation unit 58 determines the authenticity of the card based on the identification information obtained by the character recognition processing. That is, the processing result evaluation unit 58 compares the extracted identification information with the evaluation parameters obtained from the evaluation parameter data server 100 to determine the authenticity of the card.

FIG. 2 is a diagram schematically showing how an ID card is authenticated. First, an ID card portion is cut out from an image of an ID card. Next, a determination target image (partial image) corresponding to a portion (rectangular small area in the drawing) on the ID card containing microcharacters is cut out. In the example of FIG. 2, it is assumed that the determination target image on the left side is that of a genuine ID card, and the determination target image on the right side is that of a forged ID card.

Image processing such as grayscale conversion, rotation, enlargement, and edge enhancement is performed on the image to be determined on the left side to enable character recognition of microcharacters, and character recognition processing is performed. Since the legitimate microcharacters have been recognized, the ID card is determined to be authentic and labeled as "authentic".

Image processing such as grayscale conversion, rotation, enlargement, and edge enhancement is performed on the determination target image on the right side to enable character recognition of microcharacters, and character recognition processing is performed. However, since the ID card is forged by a printer, etc., the micro characters cannot be reproduced, and the genuine micro characters cannot be recognized. display.

In this way, the control unit 51 can display the authentication result of the target medium on the display unit 55 (display screen).

With the above-described configuration, the user does not need to have any special skills or knowledge, and the authenticity of the ID card can be determined simply by photographing the target medium such as the ID card with the authenticity determination device 50 composed of a smartphone, a tablet terminal, or the like. Determination can be performed with high accuracy.

FIG. 3 is a diagram showing an example of evaluation parameters. The evaluation parameters consist of an assumed character size (number of pixels) and an assumed character string, and unique evaluation parameters are determined for each type of card. As shown in FIG. 3, for example, if the card type is A, the assumed character size (character size) is Sa and the assumed character string (character string) is "SPECIMEN". If the card type is B, the assumed character size is Sb and the assumed character string is "ARXBTMKLNSWP". In addition, the example of FIG. 3 is an example, and it is not limited to these. For example, expected strings may include numbers, lowercase letters, and other symbols.

As described above, the control unit 51 determines the type of target medium based on the acquired image, and acquires evaluation parameters according to the determined type.

FIG. 4 is a diagram showing an example of authenticity determination based on the result of character recognition of a determination portion of an ID card. FIG. 4A shows the character recognition result for an ID card of card type A and card #1. As shown in FIG. 4A, the positions (coordinates) of the determination points are (x1, y1) and (x2, y2). For the coordinates, for example, the upper left corner of the card is the origin, x in the horizontal direction, and y in the vertical direction. Assume that the character recognition result at position (x1, y1) is "PPPS" and the size of the recognized character is outside the allowable range. It is also assumed that the character recognition result at the position (x2, y2) is "none" (the character could not be recognized). As exemplified in FIG. 3 above, the legal character string for card type A is "SPECIMEN", the character recognition result and the legal character string do not match, and the character size is out of the allowable range. , the authenticity judgment of the ID card of card #1 is false.

FIG. 4B shows the character recognition result for an ID card of card type A and card #2. As shown in FIG. 4B, let the position (coordinates) of the determination point be (x1, y1). Assume that the character recognition result at position (x1, y1) is "SPECIMENC" and the size of the recognized character is within the allowable range. As illustrated in FIG. 3 above, the legal character string for card type A is "SPECIMEN", the character recognition result matches the legal character string, and the character size is within the allowable range. The authenticity judgment of the ID card of card #2 becomes true. It should be noted that determination of match/mismatch between character strings is not limited to complete match, and as shown in FIG. 4B, match may be determined if most of the character strings match. The required degree of matching can be determined according to the security policy for each type of ID card.

As described above, the control unit 51 compares the extracted identification information (character recognition result) with the evaluation parameter (evaluation information) to determine the authenticity of the target medium.

The control unit 51 may determine the authenticity of the target medium based on whether or not the extracted identification information is the assumed character size. The control unit 51 may determine the authenticity of the target medium based on whether the extracted identification information is an assumed character string. It should be noted that authenticity determination may be performed only based on whether the extracted identification information is an assumed character string.

5 and 6 are diagrams showing an example of authenticity determination processing by the authenticity determination device 50. FIG. In the following description, for the sake of convenience, the main body of processing is assumed to be the control unit 51 . The control unit 51 acquires an image of the ID card (S11). The image of the ID card can be acquired by being photographed by the image photographing section 54 . Also, the image of the ID card may be acquired from an external device via the communication unit 52 .

The control unit 51 determines the card type and the front and back sides (S12), and acquires evaluation parameters according to the card type from the evaluation parameter data server 100 (S13). The control unit 51 cuts out a partial image (determination target image) of the judgment location (S14), and performs image processing on the cut out partial image (S15). Image processing may include at least one of grayscale conversion, rotation, enlargement, and edge enhancement.

The control unit 51 performs character recognition at the determination location (S16), and determines whether or not the assumed character string included in the evaluation parameter exists at the determination location (S17). If the assumed character string exists (YES in S17), the control unit 51 determines whether or not the assumed character string present at the determination location is a micro character (S18).

Determination of whether or not it is a micro character can be made according to whether or not the size of the character string at the determination location is within the allowable range of the size (for example, about 300 μm) defined for micro characters. . Specifically, the character size (pixels) is estimated from the recognition coordinate information of the determination location. Since the character recognition direction is standardized by image processing such as rotation, the height of the character recognition area becomes the character size. By comparing the recognition coordinate information of the determination location and the assumed character size, it is possible to determine whether or not the recognized character is a micro character. When an assumed character string exists in the judgment location and the size is equivalent to micro characters, the authenticity judgment is performed by calculating a true evaluation value (evaluation value) indicating the degree of authenticity as follows.

If the assumed character string existing in the determination location is a micro character (YES in S18), the control unit 51 sets the code M indicating the number of matches to 0 (S19), and verifies the character string for verification from the assumed character string of the evaluation parameter. (S20). Verification characters can be obtained in order from the beginning of the assumed character string.

The control unit 51 determines whether or not there is a matching verification character in the recognized character string recognized at the determination location (S21), and if there is a matching verification character (YES in S21), 1 is added to the code M (S22), and the true evaluation value is calculated by V×M (S23). Here, the value of V can be, for example, 0.1, but is not limited to this. If there is no matching verification character (NO in S21), the control unit 51 performs the process of step S24, which will be described later.

The control unit 51 determines whether or not there is an unprocessed verification character in the assumed character string (S24), and if there is an unprocessed verification character (YES in S24), the next verification character is (S25). The next verification character can be obtained in order from the beginning to the end of the assumed string. The control unit 51 continues the processing after step S21.

If there is no unprocessed verification character (NO in S24), the control unit 51 determines whether or not there is an unprocessed determination point (S26). YES), the process from step S17 onwards is continued. If there is no unprocessed determination point (NO in S26), the control unit 51 determines whether or not the calculated true evaluation value is greater than the threshold (S27).

If the calculated true evaluation value is greater than the threshold (YES in S27), the control unit 51 displays that the ID card is "genuine" (S28), and ends the process. If the calculated true evaluation value is not greater than the threshold value (NO in S27), the control unit 51 displays that the ID card is "fake" (S29), and ends the process. If the assumed character string does not exist (NO at S17), or if the assumed character string present at the determination location is not a micro character (NO at S18), the control unit 51 performs the process of step S29.

As described above, the control unit 51 compares the extracted identification information with the assumed character string to calculate the true evaluation value, and determines whether the calculated true evaluation value is equal to or greater than a predetermined threshold (or exceeds the threshold). The authenticity of the target medium may be determined based on whether or not it is. Further, the control unit 51 may add the true evaluation value according to the number of matches between the extracted identification information and the assumed character string. If the threshold value is increased, the authentication can be made stricter, and if the threshold value is made smaller, the authentication can be made more moderate. It can be performed.

In the above-described embodiment, the authentication device 50 is assumed to be a user-portable device, but is not limited to this. For example, a user carries a terminal device such as a smartphone or a tablet terminal, and an image obtained by photographing a target medium with a camera provided in the terminal device is sent to a server as the authenticity determination device 50 via a communication network. It may be configured such that the file is uploaded, authenticity determination is performed by the server, and the determination result is transmitted to the terminal device of the user.

A computer program according to the present embodiment causes a computer to acquire an image of a target medium, specify a determination target image based on the acquired image, perform predetermined image processing on the specified determination target image, and after image processing identification information is extracted based on the image to be determined, and authenticity of the target medium is determined based on the extracted identification information.

A computer program according to the present embodiment causes a computer to execute a process of displaying a result of authenticity determination of the target medium on a display screen.

In the computer program of this embodiment, the predetermined image processing includes at least one of grayscale conversion, rotation, enlargement, and edge enhancement.

A computer program according to the present embodiment causes a computer to execute processing for judging the authenticity of the target medium by comparing extracted identification information with evaluation information for authenticity judgment.

A computer program according to the present embodiment causes a computer to determine the type of the target medium based on an acquired image and acquire the evaluation information corresponding to the determined type.

In the computer program of the present embodiment, the evaluation information includes a character size, and causes a computer to determine the authenticity of the target medium based on whether the extracted identification information is the character size. .

In the computer program of the present embodiment, the evaluation information includes a character string, and causes a computer to determine the authenticity of the target medium based on whether the extracted identification information is the character string. .

The computer program of the present embodiment causes a computer to compare the extracted identification information with the assumed character string to calculate an evaluation value, and based on whether the calculated evaluation value is equal to or greater than a predetermined threshold, the target A process of judging the authenticity of the medium is executed.

A computer program according to the present embodiment causes a computer to execute a process of adding the evaluation value according to the number of matches between the extracted identification information and the assumed character string.

The authenticity determination apparatus of this embodiment includes an acquisition unit that acquires an image of a target medium, a specification unit that specifies a determination target image based on the acquired image, and performs predetermined image processing on the specified determination target image. An image processing unit, an extracting unit for extracting identification information based on a determination target image after image processing, and a determination unit for determining authenticity of the target medium based on the extracted identification information.

The authenticity determination method of the present embodiment acquires an image of a target medium, specifies a determination target image based on the acquired image, performs predetermined image processing on the specified determination target image, and performs determination after image processing. Identification information is extracted based on the target image, and authenticity of the target medium is determined based on the extracted identification information.

1 communication network 50 authenticity determination device 51 control unit 52 communication unit 53 memory 54 image capturing unit 55 display unit 56 card surface determination unit 57 image processing unit 58 processing result evaluation unit 59 storage unit 60 computer program

Claims (11)

to the computer,
Acquire an image of the target medium,
Identifying an image to be judged based on the acquired image,
Predetermined image processing is performed on the identified determination target image,
Extracting identification information based on the determination target image after image processing,
determining the authenticity of the target medium based on the extracted identification information;
A computer program that causes a process to be performed. to the computer,
displaying on a display screen the authentication result of the target medium;
2. The computer program according to claim 1, causing a process to be executed. The predetermined image processing includes:
including at least one of grayscale conversion, rotation, enlargement, and edge enhancement;
3. A computer program according to claim 1 or claim 2. to the computer,
determining the authenticity of the target medium by comparing the extracted identification information with evaluation information for authenticity determination;
4. The computer program according to any one of claims 1 to 3, causing a process to be executed. to the computer,
determining the type of the target medium based on the acquired image;
Acquiring the evaluation information according to the determined type;
5. The computer program according to claim 4, causing a process to be executed. The evaluation information includes character size,
to the computer,
determining the authenticity of the target medium based on whether the extracted identification information is the character size;
6. The computer program according to claim 4 or 5, causing a process to be executed. The evaluation information includes a character string,
to the computer,
determining the authenticity of the target medium based on whether the extracted identification information is the character string;
7. The computer program according to any one of claims 4 to 6, causing a process to be executed. to the computer,
calculating an evaluation value by comparing the extracted identification information with the assumed character string;
determining the authenticity of the target medium based on whether the calculated evaluation value is equal to or greater than a predetermined threshold;
8. The computer program according to claim 7, causing a process to be executed. to the computer,
adding the evaluation value according to the number of matches between the extracted identification information and the assumed character string;
9. The computer program according to claim 8, causing a process to be executed. an acquisition unit that acquires an image of a target medium;
a specifying unit that specifies a determination target image based on the acquired image;
an image processing unit that performs predetermined image processing on the identified determination target image;
an extraction unit that extracts identification information based on the determination target image after image processing;
a determination unit that determines the authenticity of the target medium based on the extracted identification information,
Authenticity determination device. Acquire an image of the target medium,
Identifying an image to be judged based on the acquired image,
Predetermined image processing is performed on the identified determination target image,
Extracting identification information based on the determination target image after image processing,
determining the authenticity of the target medium based on the extracted identification information;
Authenticity determination method.

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