JP2022146248A - Authenticity determination system, reading device, authenticity determination device, and program - Google Patents

Abstract

To provide a highly popular authenticity determination system.SOLUTION: An authenticity determination system 1 performs the authenticity determination of an ID card 10. The authenticity determination system 1 scans the ID card 10 by a scanner and includes: a reading device 2 that acquires an image of the ID card 10; and an authenticity determination device 3 that has authenticity determination means that performs the authenticity determination of the ID card 10 by step parts that lines of a printed part has, based on an image of the printed part of the ID card 10 by the thermal transfer method. The reading device 2 acquires an image of the printed part of the ID card 10 by receiving light from the ID card 10 with photo detectors of the scanner each time the photo detectors make a relative displacement in a sub-scanning direction against the ID card 10 by a shorter distance than a length in the sub-scanning direction of the photo detectors.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an authenticity determination system and the like for determining the authenticity of a personal identification card.

Financial institutions and mobile phone carriers require ID cards (personal identification) such as driver's licenses to verify identity when signing contracts. It's getting

ID cards such as driver's licenses are generally printed using the thermal transfer method, but in the case of counterfeiting or alteration, ID cards are often printed using the most readily available high-resolution inkjet printer. many.

Therefore, Japanese Patent Laid-Open No. 2002-100001 describes that an image of a driver's license or the like is used to determine authenticity based on a stepped portion of a line printed by a thermal transfer method.

JP 2019-117549 A

As described above, a reading device with high resolution is required to determine authenticity from an image such as a driver's license, but such a reading device is expensive and has a problem in terms of widespread use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly popular authentication system and the like.

A first invention for solving the above-mentioned problems is an authenticity determination system for determining the authenticity of a personal identification card, comprising a reading device for scanning the personal identification card with a scanner and acquiring an image of the personal identification card. an authenticity determination device having authenticity determination means for determining the authenticity of the personal identification card based on the image of the printed portion of the personal identification card by the thermal transfer method, by the stepped portion of the line of the printed portion, Each time the light receiving element of the scanner moves relative to the personal identification card in the sub-scanning direction by a first distance smaller than the length of the light receiving element in the sub-scanning direction, the reader reads from the personal identification card. The authentication system is characterized in that an image of the printed portion of the personal identification card is obtained by receiving light with the light receiving element.

In the present invention, by utilizing the fact that a stepped portion peculiar to the thermal transfer method derived from the thermal head element of the thermal transfer printer appears in the portion printed by the thermal transfer method, the authenticity of the personal identification card is determined by this stepped portion, and the inkjet printer, etc. It is possible to distinguish a forged identity verification card as a forgery. In the present invention, when acquiring the image of the printed portion, the light-receiving element of the scanner is finely moved while scanning the personal identification card with high precision. It will become cheaper and more popular.

The reading device receives the light from the personal identification card each time the light receiving element of the scanner moves relative to the personal identification card by a second distance larger than the first distance in the sub-scanning direction. By receiving light with an element, the whole image of the personal identification card is acquired, the authenticity determination device has extraction means for extracting the printed part from the whole image, and the reading device has the position of the printed part It is desirable to obtain an image of the printed portion by receiving information from the authentication device.
In the present invention, the printed portion used for authenticity determination is extracted from the entire image of the personal identification card obtained by scanning the personal identification card more roughly than when the image of the printed portion was obtained, and only the printed portion is extracted. As described above, high-definition scanning can be performed, and by limiting the portion of the personal identification card to be scanned in high-definition, it contributes to the efficiency of inspection.

The authenticity determination means determines whether or not the personal identification card is a true personal identification card in which the printed portion is printed by a thermal transfer printer with a predetermined dpi, based on the width of the stepped portion in the sub-scanning direction. It is desirable to
Since the width of the stepped portion differs depending on the dpi (resolution) of the thermal transfer printer, by using this width for authenticity determination, a thermal transfer printer with a dpi different from the thermal transfer printer used for printing the positive personal identification card was used for forgery. can be determined to be false.

The authenticity determination device binarizes the image of the printed portion of the personal identification card, and divides the pixel value of the binarized image into the values of the pixel and the pixels on both sides of the pixel in the sub-scanning direction. It is desirable to have image processing means for removing noise by using a large number of the values, and for the authenticity determination means to perform the authenticity determination from the image after noise removal.
As a result, noise appearing in the image obtained by scanning the printed portion can be removed, and authenticity determination can be performed with high accuracy.

The printed portion is, for example, predetermined specific characters.
Personal identification cards such as driver's licenses are printed with characters such as the holder's date of birth, address, and the date of issue of the identification card by thermal transfer. I can judge. In the present invention, authenticity determination can be performed with high accuracy and efficiency by extracting specific characters that are likely to have multi-layered portions.

A second aspect of the invention is a reading device for scanning an identity verification card with a scanner to acquire an image of the identity verification card, wherein a light receiving element of the scanner has a length smaller than the length of the light receiving element in the sub-scanning direction. Every time the personal identification card moves relative to the personal identification card in the sub-scanning direction by a distance, the light from the personal identification card is received by the light-receiving element, thereby acquiring the image of the printed portion of the personal identification card by the thermal transfer method. The reading device is characterized by:

A third invention is an authenticity determination device for determining the authenticity of a personal identification card, based on the image of the printed portion of the personal identification card obtained by scanning the personal identification card with a scanner, by the thermal transfer method. Authenticity determination means for determining the authenticity of the personal identification card by means of a stepped portion of the lines of the printed portion, wherein the image is captured by the light receiving element of the scanner at a first distance smaller than the length of the light receiving element in the sub-scanning direction. obtained by receiving the light from the personal identification card with the light receiving element each time the identification card moves relative to the personal identification card in the sub-scanning direction by .

A fourth aspect of the invention is an authenticity determination device for determining the authenticity of a personal identification card based on the image of the printed portion of the personal identification card obtained by scanning the personal identification card with a scanner. and authenticity determination means for determining the authenticity of the personal identification card by means of a stepped portion of the lines of the printed portion, wherein the image is obtained by the light receiving element of the scanner being smaller than the length of the light receiving element in the sub-scanning direction. The authenticity determination is obtained by receiving light from the personal identification card with the light receiving element each time the personal identification card moves relative to the personal identification card in the sub-scanning direction by a distance of 1. It is a program for functioning as a device.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a highly popular authentication system and the like.

The figure which shows the outline of the authenticity determination system 1. FIG. 2 is a diagram showing the hardware configuration of a reading device 2; FIG. 2 is a diagram showing the hardware configuration of an authenticity determination device 3; FIG. 3 is a block diagram showing functions of an authenticity determination device 3; FIG. 2 is a diagram showing an outline of an ID card 10; FIG. An example of enlarging a part of a character. 4A and 4B are diagrams for explaining printing by the thermal transfer printer 100; FIG. 4 is a flowchart showing processing of the authenticity determination system 1; 4A and 4B are diagrams for explaining scanning of the ID card 10; FIG. An example of image data 4; The flowchart which shows the procedure of authenticity determination. The figure explaining authenticity determination.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

(1. Authenticity determination system 1)
FIG. 1 is a diagram showing an outline of an authenticity determination system 1 according to an embodiment of the present invention. The authenticity determination system 1 determines the authenticity of an ID card 10 and has a reading device 2 and an authenticity determination device 3 . The reading device 2 and the authenticity determination device 3 are communicably connected by wireless communication means such as Bluetooth (registered trademark), but may be connected by wire.

The reading device 2 reads the image of the ID card 10 by scanning the ID card 10 with a scanner, and transmits the image to the authentication device 3 .

FIG. 2 is a diagram showing the hardware configuration of the reader 2. As shown in FIG. As shown in FIG. 2, the reading device 2 includes a reader 21, a scanner 22, a computer 23, and a communication section 24. FIG. Although not shown, the reading device 2 also includes a battery and the like.

A reader 21 reads the IC chip of the ID card 10 . A known card reader or the like can be used as the reader 21 .

The scanner 22 scans the ID card 10 and obtains an image of the ID card 10 . The scanner 22 has a scanner head with light-receiving elements arranged in a row. While irradiating the ID card 10 with light, the scanner head is moved relative to the ID card 10, and the light reflected from the ID card 10 is received by each light-receiving element. An image of the ID card 10 is acquired by receiving light. The direction in which the light-receiving elements are arranged and the direction in which the scanner head moves are perpendicular to each other in a plane, the former being called the main scanning direction (of the scanner 22) and the latter being called the sub-scanning direction (of the scanner 22).

The computer 23 is a control device that controls each part of the reading device 2 and executes processing of the reading device 2, which will be described later. A storage area of the computer 23 stores a program for executing a process to be described later. Note that an FPGA (field-programmable gate array) or the like can be used instead of the computer 23 .

The communication unit 24 communicates with the authentication device 3 by wireless communication means such as Bluetooth (registered trademark).

Returning to the description of FIG. The authenticity determination device 3 determines the authenticity of the ID card 10 from the image of the ID card 10 .

FIG. 3 is a diagram showing the hardware configuration of the authenticity determination device 3. As shown in FIG. As shown in FIG. 3, the authenticity determination device 3 can be implemented by a computer configured by connecting a control section 31, a storage section 32, a display section 33, an input section 34, a communication control section 35, and the like via a bus or the like. However, it is not limited to this, and various configurations can be appropriately adopted.

The control unit 31 is composed of a CPU, ROM, RAM, and the like. The CPU calls a program related to processing of the authenticity determination device 3 stored in a storage medium such as the storage unit 32 or ROM to a work area on the RAM and executes the program. ROM is a non-volatile memory that permanently holds programs such as boot programs and BIOS, data, and so on. The RAM is a volatile memory, temporarily holds programs and data loaded from the storage unit 32, ROM, etc., and has a work area used by the control unit 31 to perform various processes.

The storage unit 32 is a hard disk drive, a solid state drive, a flash memory, or the like, and stores programs executed by the authenticity determination device 3 in the process described later, data necessary for executing the programs, an OS, and the like. These programs and data are read and executed by the control unit 31 as necessary.

The display unit 33 includes a liquid crystal display or the like.
The input unit 34 inputs various settings to the authentication device 3 .
The communication control unit 35 is a communication interface that mediates wireless communication, and communicates with the reading device 2 .

FIG. 4 is a block diagram showing functions of the authentication device 3. As shown in FIG. As shown in FIG. 4, the authenticity determination device 3 has extraction means 301, image processing means 302, authenticity determination means 303, and the like.

The extracting means 301 extracts a specific printed portion of the ID card 10 from the entire image of the ID card 10 read by the scanner 22 of the reading device 2 by the control section 31 of the authentication device 3 . This printed portion is a portion printed by a thermal transfer method to be described later, and the details thereof will be described later.

The image processing means 302 binarizes the image of the printed portion read by the scanner 22 of the reading device 2 by the control unit 31 of the authenticity determination device 3, and removes noise from the binarized image.

The authenticity determination means 303 determines the authenticity of the ID card 10 based on the noise-removed image by the controller 31 of the authenticity determination device 3, based on the stepped portion of the lines of the printed portion of the ID card 10. be. The details of authenticity determination will be described later.

(2. ID card 10)
The ID card 10 is a personal identification card to be authenticated in this embodiment. A personal identification card is a medium used for personal identification by financial institutions, mobile phone carriers, etc., and includes, for example, a driver's license, my number card, a residence card, a special permanent resident card, and the like.

FIG. 5 is a diagram showing an outline of the ID card 10, and schematically shows an example of the face of the ID card 10. As shown in FIG. The ID card 10 has a holder's name 12, date of birth 13, address 14, face image 15, issue date 16 of the ID card 10, etc. printed on a substantially rectangular card substrate 11. FIG. An IC chip is provided on the back surface of the ID card 10, although not shown.

The card holder's name 12, date of birth 13, address 14, and issue date 16 of the ID card 10 are monochrome-printed on the card substrate 11 by a thermal transfer printer having a predetermined dpi (resolution) by a melting type thermal transfer method. be done. On the other hand, the frame and ruled lines indicating the entry fields such as the name 12 are formed in advance on the card base material 11 by a printing method other than the thermal transfer method, such as the offset printing method or the letterpress printing method, and are called a pre-printed portion.

FIG. 6(a) is an example in which a part of characters of the ID card 10 printed by the thermal transfer method is enlarged. In this embodiment, a large number of stepped portions B are formed in the character lines. The stepped portion B is a substantially L-shaped portion generated at the outline of the line, and is formed by printing characters by a thermal transfer method. The stepped portion B is formed particularly conspicuously in the curved or oblique line portion of the character. On the other hand, when characters are printed by an ink-jet printer, the lines are smooth and no clear steps are formed, as shown in FIG. 6(b).

(3. Printing of ID card 10 by thermal transfer method)
Thermal transfer printing is performed by a thermal transfer printer 100 shown in FIG. 7(a). In the thermal transfer printer 100 , the thermal transfer ribbon 200 wound around the supply reel 101 is unwound and conveyed, while the thermal head 110 heats the thermal transfer ribbon 200 to transfer the transfer layer to the ID card 10 . The thermal transfer ribbon 200 after transfer is taken up by a take-up reel 102 . Characters are printed by transferring a K (black) transfer layer to the ID card 10 while the ID card 10 is being conveyed by the conveying rollers 103 .

As shown in FIG. 7B, the thermal head 110 applies heat to the thermal transfer ribbon 200 from the thermal head elements 111 provided on the bottom surface thereof. A plurality of thermal head elements 111 are arranged in a row on the lower surface of the thermal head 110 as shown in FIG. is done.

The direction in which the thermal head elements 111 are arranged is perpendicular to the conveying direction of the ID card 10 during printing, and is called the main scanning direction (of the thermal transfer printer 100). On the other hand, the conveying direction of the ID card 10 during printing is called the sub-scanning direction (of the thermal transfer printer 100). In this embodiment, the main scanning direction corresponds to the short side direction of the ID card 10 and the sub scanning direction corresponds to the long side direction of the ID card 10 . The length Dm in the main scanning direction and the length Ds in the sub-scanning direction of the thermal head element 111 differ depending on the dpi of the thermal transfer printer 100, and Dm and Ds become shorter as the dpi increases.

When the thermal head element 111 applies heat to the range C of the transfer layer 202 in FIG. 7(b), the transfer layer 202 in the range C adheres to the ID card 10 in the melting type thermal transfer method, and the thermal transfer ribbon 200 is wound up. When the ID card 10 is separated from the reel 102 , the thermal transfer ribbon 200 is separated from the base material 201 . As a result, the transfer layer 202 is transferred to the ID card 10 and characters are printed.

As a result, the characters are printed in units of the size of the thermal head element 111, and as shown in part in FIG. It is formed.

The widths a1 to a3 of the step portion in the main scanning direction are values n·Dm (n=1, 2, 3, . . . ) obtained by multiplying the length Dm of the thermal head element 111 in the main scanning direction by an integer.

On the other hand, widths b1 to b3 of the stepped portions in the sub-scanning direction are approximately n·Ds (n=1, 2, 3, . The term “approximately” means the length W of the transfer layer 202 peeled off from the thermal transfer ribbon 200 in the sub-scanning direction (Fig. 7B )) may vary, and strictly speaking, it may not be an integral multiple of the length Ds of the thermal head element 111 in the sub-scanning direction.

(4. Outline of processing of authenticity determination system 1)
FIG. 8 is a flowchart showing an overview of the processing of the authenticity determination system 1. As shown in FIG. S1 to S2 and S6 to S8 in FIG. 8 are processes executed by the computer 23 of the reading device 2 by controlling each part of the reading device 2. It is a process executed by controlling each part of the authenticity determination device 3 .

The process of FIG. 8 is started by, for example, setting the ID card 10 at a specified position of the reading device 2 and transmitting an instruction to start processing from the authentication device 3 to the reading device 2 . The reading device 2 first scans the surface of the ID card 10 with the scanner 22 (S1), and transmits the obtained whole image of the ID card 10 to the authentication device 3 (S2).

FIGS. 9A to 9C are diagrams for explaining the scanning of S1. In this embodiment, as shown in FIG. 9(a), a scanner head in which a plurality of light receiving elements 221 are arranged in a row moves the ID card 10 along the sub-scanning direction of the scanner 22 as shown by the arrow d in FIG. 9(b). Light from the ID card 10 is received by each light receiving element 221 each time the ID card 10 moves relative to the direction. In this embodiment, the sub-scanning direction corresponds to the long side direction of the ID card 10 . One movement distance (second distance) of the scanner head (light receiving element 221) corresponds to the length D of the light receiving element 221 in the sub-scanning direction. In the following description, the main scanning direction and the sub-scanning direction refer to the main scanning direction and the sub-scanning direction of the scanner 22 unless otherwise specified.

FIG. 9(c) shows the state after scanning a certain range, and FIG. 10(a) is an example of image data 4 created at this time. The value V (V ₁₁ to V ₅₇ ) of each pixel of the image data 4 depends on the amount of light received by the light receiving element 221 at each scanner head position. For example, the value V of each pixel in rows R1 and R2 of image data 4 corresponds to the amount of light received by each light receiving element 221 when the scanner head is at positions D1 and D2 in FIG. 9(c).

When the authenticity determination device 3 receives the image data 4 of the entire image of the ID card 10 (S3), the image data 4 is subjected to known OCR (optical character recognition) processing to search for predetermined specific characters. and extract it (S4). After extracting the specific character, the authenticity determination device 3 transmits the position information of the character portion to the reading device 2 (S5).

In this embodiment, specific characters are searched for in predetermined areas a to c (see FIG. 5) on which the date of birth 13, address 14, and issue date 16 of the ID card 10 are printed. The search order for each of the areas a to c can be determined in advance, and the character extraction ends when a predetermined number of specific characters are extracted. Here, the predetermined number is assumed to be 1 for simplicity of explanation.

Although the specific characters are not particularly limited, in the present embodiment, as will be described later, authenticity determination is performed based on the stepped portions of the lines of the characters. 14. Characters (numbers) such as "0", "8", "3", "2", and "4" that are often used as the issue date 16 are desirable.

Upon receiving the positional information of the character portion (S6), the reading device 2 moves the scanner head to the character portion based on the positional information, scans the character portion with high definition (S7), and reads the obtained character. The partial image is transmitted to the authentication device 3 (S8).

9D and 9E are diagrams for explaining the scanning of S7 in comparison with the scanning of S1 (FIGS. 9B and 9C).

In S7, each light receiving element 221 receives light from the ID card 10 each time the scanner head (light receiving element 221) moves relative to the ID card 10 in the sub-scanning direction. However, in S7, the one-time movement distance (first distance) of the scanner head at this time is set to a length shorter than the length D of the light receiving element 221 in the sub-scanning direction as shown in FIG. 1/3D.

FIG. 9(e) shows the state after scanning the same range as in FIG. 9(c). , the number of columns increases compared to the scanning of S1 (see FIG. 10A). Note that the pixel values V of the columns R1 and R2 of the image data 4 in FIG. 10(b) correspond to the amounts of light received by the light receiving elements 221 when the scanner head is at the positions D1 and D2 in FIG. 9(e). is doing.

When the authenticity determination device 3 receives the character image data 4 (S9), it uses the character image data 4 to determine the authenticity of the ID card 10 (S10). The details of this authenticity determination will be described later. The authenticity determination device 3 displays the determination result on the display unit 33 (S11), and ends the process. The operator can see the determination result and take appropriate measures.

In addition to the above processing, the reading device 2 can read the IC chip of the ID card 10 by the reader 21 and determine whether it is an authentic IC chip that has not been forged. Reliable authenticity determination is possible.

(5. Authenticity determination processing)
Next, the procedure for authenticity determination processing in S10 will be described. FIG. 11 is a flow chart showing the authenticity determination process of S10.

In S10, the authenticity determination device 3 first converts the image data 4 of the character portion into grayscale as necessary, and then binarizes the image data 4 (S101). Noise is removed from the binarized image data 4 (S102).

FIG. 12A shows an example of image data 4 after binarization, where a value of "1" indicates a black pixel and a value of "0" indicates a white pixel. In S102, the value of the pixel of interest 41 of the image data 4 is calculated as the value of the pixel of interest 41 and the pixels 42 on both sides in the sub-scanning direction (corresponding to the row direction of the image data 4, that is, the horizontal direction in FIG. 12A). Let it be a number of values.

Noise is removed from the image data 4 by repeating the above-described processing with each pixel of the image data 4 as the target pixel 41 . For example, when noise (black pixels) is generated as indicated by reference numeral 43 in FIG. The noise is removed (resulting in white pixels) as shown in b).

Next, the authenticity determination device 3 detects stepped portions of lines of characters from the image data 4 after noise removal (S103).

Although the method of detecting the stepped portion is not particularly limited, in this embodiment, for example, as shown in FIG. First, the position where the value changes to "0" is detected as the boundary 44. FIG.

Then, as shown in FIG. 12(d), the authenticity determination device 3 calculates the distance L between the boundaries 44 adjacent to each other in the column direction (corresponding to the vertical direction in FIG. 12(d)) of the image data 4. . At this time, if the positions of the boundaries 44 in the sub-scanning direction are the same between adjacent rows in the column direction of the image data 4 (see the boundaries 44 on the right side of FIG. 12(c)), these boundaries 44 It is regarded as one continuous boundary 44 as shown in (d).

The above distance L can be calculated from the number of pixels, and when the distance L is equal to or greater than a predetermined value, the authenticity determination device 3 detects this as a stepped portion of a character, and uses the distance L as the width of the stepped portion in the sub-scanning direction. .

In the above example, when the positions of the boundaries 44 in the sub-scanning direction are the same between adjacent rows in the column direction of the image data 4, these boundaries 44 are regarded as one continuous boundary 44. , if the difference in position of the boundaries 44 in the sub-scanning direction is within a certain value between adjacent rows of the image data 4 in the column direction, these boundaries 44 may be regarded as one continuous boundary 44 .

The authentication device 3 detects one or more steps from the image data 4 as described above. The number of pixels of the image data 4 corresponding to the length Ds of the thermal head element 111 (the length of the thermal transfer printer 100 in the sub-scanning direction; see FIG. 7C) (that is, the length Ds is ) is used as a reference value S, and the width L of each stepped portion and the reference value S are compared.

Then, if there are a predetermined number or more of stepped portions having a width L that is an integral multiple of the reference value S (n=1, 2, 3, etc.) (S104; YES), the authenticity determination device 3 determines that the character is It is assumed that the ID card 10 was printed by the thermal transfer printer 100 with a predetermined dpi used for printing the positive ID card 10, and the ID card 10 is judged true (S105). On the other hand, if there are not a predetermined number or more of stepped portions having a width L that is an integer multiple n·S of the reference value S (S104; NO), the ID card 10 is determined not to be true (S106). Note that the “stepped portion having a width L that is an integer multiple n·S of the reference value S” includes a stepped portion whose width L is within the error range with respect to an integer multiple n·S of the reference value S. be The error range can be arbitrarily set in consideration of inspection accuracy and the like.

Although the predetermined number is not particularly limited, it can be predetermined according to the characters extracted in S4 (see FIG. 8), for example. Alternatively, the predetermined number may be a ratio to the number of steps detected in S103.

As described above, in the present embodiment, by utilizing the fact that a stepped portion peculiar to the thermal transfer method derived from the thermal head element 111 of the thermal transfer printer 100 appears in the portion printed by the thermal transfer method, the ID card 10 can be authenticated by this stepped portion. By performing the determination, it is possible to determine that the ID card 10 forged by an inkjet printer or the like is counterfeit. In addition, in this embodiment, when the image of the printed portion is obtained, the ID card 10 is scanned with high precision while the scanner head (light receiving element 221) is finely moved. The system configuration becomes cheaper, and the popularization improves.

On the ID card 10, characters such as the holder's date of birth 13, the address 14, and the issue date 16 of the ID card 10 are printed by the thermal transfer printer 100, so that the authenticity of the ID card 10 can be determined by the multi-layered portions of these characters. . In this embodiment, authenticity determination can be performed with high accuracy and efficiency by extracting specific characters having curved lines or oblique lines that are likely to have stepped portions.

Since the width L of the step differs depending on the dpi of the thermal transfer printer 100, in this embodiment, by using this width L for authenticity determination, a thermal transfer printer with a dpi different from that of the thermal transfer printer 100 used to print the positive ID card 10 can be counterfeited. A forged ID card 10 prepared for this purpose can also be identified as a counterfeit.

Further, in the present embodiment, the ID card 10 is scanned roughly in S1 (see FIG. 8) by increasing the moving distance of one scan of the scanner head compared to the scanning in S7, and the ID card obtained by this scanning is 10, the printed portion used for authenticity determination can be extracted, and high-definition scanning in S7 can be performed only on the printed portion. Contribute to efficiency. However, by scanning the entire image of the ID card 10 in S1 with high definition as in S7, it is possible to omit the processing of S4 to S9.

Furthermore, in the present embodiment, binarization and noise removal are performed on the image data 4 as described above, and authenticity determination can be performed with high accuracy from the image data 4 after noise removal.

However, the invention is not limited to the above embodiments. For example, in order to improve inspection accuracy, it is also possible to perform authenticity determination using a plurality of characters. However, considering the processing time, the number of characters is preferably about three. When a plurality of characters are used for determination, the above-described processing of S101 to S104 is performed for each character to determine whether or not it was printed by the thermal transfer printer 100 of a predetermined dpi, and printed by the thermal transfer printer 100 of a predetermined dpi. The ID card 10 can be true if the number of characters determined to have been verified is greater than or equal to a predetermined number.

Further, in the present embodiment, lines of monochrome printed characters are used for authenticity determination, but lines other than characters can be used for authenticity determination as long as the portion is printed by the thermal transfer method, and color printing is also possible. The drawn line may be used for authenticity determination.

In this embodiment, the sub-scanning direction of the scanner 22 corresponds to the long side direction of the ID card 10, but if the sub-scanning direction of the scanner 22 is the short side direction of the ID card 10, the length of the thermal head element 111 is Determination using Dm (the length of the thermal transfer printer 100 in the main scanning direction; see FIG. 7C) as a reference value is also possible, and an improvement in inspection accuracy can be expected.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Authenticity determination system 2: Reader 3: Authenticity determination device 10: ID card 22: Scanner 100: Thermal transfer printer 110: Thermal head 111: Thermal head element 221: Light receiving element 301: Extraction means 302: Image processing means 303: Authenticity judgment means

Claims (8)

An authenticity determination system for determining the authenticity of an identity verification card,
a reading device that scans an identification card with a scanner and obtains an image of the identification card;
an authenticity determination device having authenticity determination means for determining the authenticity of the personal identification card based on the image of the printed portion of the personal identification card printed by a thermal transfer method, by means of a stepped portion of the lines of the printed portion;
has
Each time the light receiving element of the scanner moves relative to the personal identification card in the sub-scanning direction by a first distance smaller than the length of the light receiving element in the sub-scanning direction, the reader reads from the personal identification card. An authenticity determination system, wherein an image of the printed portion of the personal identification card is obtained by receiving light with the light receiving element. The reading device receives the light from the personal identification card each time the light receiving element of the scanner moves relative to the personal identification card by a second distance larger than the first distance in the sub-scanning direction. By receiving light with an element, an entire image of the identity verification card is acquired,
The authenticity determination device has extraction means for extracting the printed portion from the entire image,
2. The authenticity determination system according to claim 1, wherein said reading device receives position information of said printed portion from said authenticity determination device and obtains an image of said printed portion. The authenticity determination means determines whether or not the personal identification card is a true personal identification card in which the printed portion is printed by a thermal transfer printer with a predetermined dpi, based on the width of the stepped portion in the sub-scanning direction. 3. The authenticity determination system according to claim 1 or 2, characterized in that: The authenticity determination device binarizes the image of the printed portion of the personal identification card, and divides the pixel value of the binarized image into the values of the pixel and the pixels on both sides of the pixel in the sub-scanning direction. having an image processing means for removing noise by using a large number of values among
4. The authenticity determination system according to claim 1, wherein said authenticity determination means performs said authenticity determination from an image after noise removal. 5. The authentication system according to any one of claims 1 to 4, wherein the printed portion is predetermined specific characters. A reading device that scans an identification card with a scanner and obtains an image of the identification card,
Each time the light receiving element of the scanner moves relative to the personal identification card in the sub-scanning direction by a first distance smaller than the length of the light receiving element in the sub-scanning direction, the light from the personal identification card is transferred to the light receiving element. A reading device that acquires an image of a portion printed by a thermal transfer method of the personal identification card by receiving light with the . An authenticity determination device for determining the authenticity of a personal identification card,
Authenticity determination means for determining the authenticity of the personal identification card based on the image of the printed portion of the personal identification card obtained by scanning the personal identification card with a scanner by the thermal transfer method, by the stepped portion of the lines of the printed portion. has
Each time the light-receiving element of the scanner moves relative to the personal identification card in the sub-scanning direction by a first distance smaller than the length of the light-receiving element in the sub-scanning direction, the image is captured by light from the personal identification card. is obtained by receiving the light with the light receiving element. the computer,
An authenticity determination device for determining the authenticity of a personal identification card,
Authenticity determination means for determining the authenticity of the personal identification card based on the image of the printed portion of the personal identification card obtained by scanning the personal identification card with a scanner by the thermal transfer method, by the stepped portion of the lines of the printed portion. has
Each time the light-receiving element of the scanner moves relative to the personal identification card in the sub-scanning direction by a first distance smaller than the length of the light-receiving element in the sub-scanning direction, the image is captured by light from the personal identification card. A program for functioning as an authenticity determination device, characterized in that it is acquired by receiving light with the light receiving element.

Images