JP6984404B2 - Authenticity tester, reader, authenticity checker system, and program - Google Patents

Description

The present invention relates to an authenticity determination device, a reading device, an authenticity determination system, and a program.

Financial institutions and mobile phone carriers need to verify their identity with a driver's license at the time of contract, but there are an increasing number of cases where ID cards such as driver's licenses are forged in order to make a contract under a pseudonym. Therefore, in order to prevent the use of a forged ID card, it is necessary to determine its authenticity.

ID cards such as driver's licenses are generally created by printing by a thermal transfer method, but when counterfeiting, the ID card is often printed using the most easily available and high-resolution inkjet printer.

Therefore, in Patent Document 1, as a method for determining the authenticity of a driver's license, an area filled with a single color is cut out from an image obtained by scanning the driver's license, and when the driver's license is printed with an inkjet printer, the area is covered. A method of determining a driver's license as false when the appearing moire fringes are present in the area is disclosed.

Japanese Unexamined Patent Publication No. 2011-34535

However, the above method cannot be applied when the ID card does not have a single color filled area, and the part of the ID card on which the name, date of birth, etc. are printed by the thermal transfer method is cut off with a cutter or the like and printed with an inkjet printer. It is also erroneously judged to be true if the false information is inserted instead.

In addition, there is a possibility that a fake ID card printed by preparing a thermal transfer printer for counterfeiting or a counterfeiting such as adding characters on the ID card with a ballpoint pen or the like may be overlooked.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an authenticity determination device for determining the authenticity of a printed matter such as an ID card printed by a thermal transfer method.

The first invention for solving the above-mentioned problems is an authenticity determination device for determining the authenticity of a printed matter, and a step portion having a line of the printed matter based on an image of the printed portion by a thermal transfer method of the printed matter. It is an authenticity determination device characterized by performing the authenticity determination of the printed matter.

In the present invention, the appearance of a step portion peculiar to the thermal transfer method derived from the thermal head element of the thermal transfer printer appears in the printed portion by the thermal transfer method, and the authenticity of the printed matter such as an ID card is determined by this step to perform inkjet. Printed matter forged by the printer can be identified as fake. This method can be applied even when there is no single-color filled area, and a printed matter in which the printed portion is cut off with a cutter or the like and false information is printed by an inkjet printer can be determined to be false.

The authenticity determination device determines whether or not the printed portion is printed by a thermal transfer printer having a predetermined dpi based on a step in a predetermined direction of the step portion, and determines a fake printed matter based on the determination result. Is desirable.
Since the step of the step differs depending on the dpi (resolution) of the thermal transfer printer, by using this step for authenticity judgment, when a thermal transfer printer with a different dpi from the thermal transfer printer used for printing positive printed matter is used for counterfeiting, This can also be determined to be false.

The predetermined direction corresponds to the main scanning direction of the thermal transfer printer. Further, in the authenticity determination device, the printed portion is printed by a thermal transfer printer having a predetermined dpi by using the step and a value obtained by multiplying the length of the thermal head element of the thermal transfer printer in the main scanning direction by an integral number. It is desirable to judge whether or not it is.
For the above steps, by using the steps in the direction corresponding to the main scanning direction of the thermal transfer printer, it is possible to determine the authenticity with high accuracy. Since this step is a value obtained by multiplying the length of the thermal head element in the main scanning direction by an integral multiple (including 1 times), it is used to determine whether or not the printed portion is printed by a thermal transfer printer having a predetermined dpi. The determination can be made suitably.

It is desirable that the authenticity determination device determines whether or not the printed portion is printed by the thermal transfer method by the step portion, and determines the false printed matter based on the determination result.
If the printed portion is not printed by the thermal transfer method, the step portion does not appear, so that the printed matter can be determined to be false.

The printed portion is, for example, characters. It is desirable that the authenticity determination device extracts specific characters used for authenticity determination from a photographed image of the printed matter.
On ID cards and the like, characters such as addresses, names, and dates of birth are printed by a thermal transfer method, so the authenticity of printed matter can be determined by the steps of these characters. In the present invention, the authenticity can be determined with high accuracy and efficiency by extracting a specific character in which a step portion is likely to be formed.

The printed matter is, for example, an ID card.
This makes it possible to determine the authenticity of the ID card used for identity verification and the like.

The authenticity determination device further determines whether or not the printed portion is printed by the thermal transfer method based on the image of the printed portion by a printing method other than the thermal transfer method of the printed matter. It is desirable to discriminate the fake printed matter from the determination result.
In some cases, such as an ID card, there is a printed portion that is printed by a printing method other than the thermal transfer method. In this case, the fake printed matter can be discriminated by utilizing the fact that the printed portion does not have a step portion.

A second invention is a device for reading a printed matter, and in order to determine the authenticity of the printed matter by a step portion of a line of a printed portion by a thermal transfer method of the printed matter, the authenticity of the printed matter is determined by the authenticity determining device. It is a reading device characterized in that an image of a printed portion is cut out and transmitted to the authenticity determination device.

A third invention is an authenticity determination system for a printed matter having a reading device and an authenticity determination device, wherein the reading device cuts out an image of a printed portion of the printed matter by a thermal transfer method from a photographed image of the printed matter and determines the authenticity. The authenticity determination device, which is transmitted to an apparatus, is an authenticity determination system characterized in that the authenticity determination of the printed matter is performed by the step portion of the line of the print portion based on the image.

The fourth invention is an authenticity determination device for determining the authenticity of a printed matter by using a computer, and based on an image of a printed portion by a thermal transfer method of the printed matter, a step portion of a line of the printed matter is used to determine the authenticity of the printed matter. It is a program for functioning as an authenticity judgment device for making a judgment.

A fifth aspect of the present invention is to capture an image of the printed matter in order to use the computer as a reading device for the printed matter to determine the authenticity of the printed matter by the step portion of the line of the printed portion by the thermal transfer method of the printed matter. This is a program for cutting out an image of the printed portion from an image and making it function as a reading device to be transmitted to the authenticity determination device.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an authenticity determination device for determining the authenticity of a printed matter such as an ID card printed by a thermal transfer method.

The figure which shows the outline of the authenticity determination system 1. The figure which shows the hardware composition of a reading apparatus 2. The figure which shows the hardware composition of the authenticity determination device 3. The figure which shows the outline of the ID card 10. An example of enlarging a part of the character. The figure which shows the pre-printing part on the card base material 11. The figure which shows the thermal transfer printer 100 and the thermal transfer ribbon 200. The figure which shows the thermal head element 111 and the character to be printed. The figure which shows the thermal transfer printer 100. The flowchart which shows the outline of the process of the authenticity determination system 1. The flowchart which shows the authenticity judgment processing by a character part. Graph of frequency distribution of steps. A flowchart showing the authenticity determination process by the pre-printed portion.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(1. Authenticity judgment 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 the ID card 10, and has a reading device 2 and an authenticity determination device 3. The reading device 2 and the authenticity determining device 3 are communicably connected by a wireless communication means such as Bluetooth (registered trademark), but may be connected by wire.

The reading device 2 reads the IC chip of the ID card 10, captures the ID card 10 with a camera, and transmits an image of a specific portion cut out from the captured image to the authenticity determination device 3.

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

The reader 21 reads the IC chip of the ID card 10.

The camera 22 captures the ID card 10. The camera 22 is, for example, a light receiving lens, CCD (Charged coupled devices) or CMOS (Complementary).
A known camera having an image sensor such as a metal-oxide-semiconductor, an A / D (Analog / digital) converter, and the like can be used.

The computer 23 is a control device that controls each part of the reading device 2 and executes a process described later in the reading device 2. A program for executing a process described later is stored in the storage area of the computer 23, and the captured image of the ID card 10 can be temporarily stored. It is also possible to use an FPGA (field-programmable gate array) or the like instead of the computer 23.

The communication unit 24 communicates with the authenticity determination device 3 by a 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 an image of a specific portion of the ID card 10.

FIG. 3 is a diagram showing a hardware configuration of the authenticity determination device 3. As shown in FIG. 3, the authenticity determination device 3 can be realized by a computer configured by connecting a control unit 31, a storage unit 32, a display unit 33, an input unit 34, a communication control unit 35, and the like by a bus or the like. However, the present invention is not limited to this, and various configurations can be taken as appropriate.

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

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

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

(2. ID card 10)
The ID card 10 has information for identifying a user who has the ID card 10, and is a printed matter that is a target of authenticity determination in the present embodiment. The information for identifying the user is, for example, a name, etc., which is printed on the ID card 10 or recorded on the IC chip. The ID card 10 is also used for identity verification as an identity verification document at the time of various contracts. The ID card 10 is, for example, a driver's license, but it is not limited to this. In addition, it may be a My Number card, a residence card, a special permanent resident card, or the like.

FIG. 4 is a diagram showing an outline of the ID card 10, and is an example of a surface on which the ID card 10 is photographed. The ID card 10 is an area a to c in which characters such as a name, date of birth, address, and issue date are printed in monochrome on a substantially rectangular card base material 11, and an area in which an image such as a user's face photograph is printed in color. Has d. Although not shown in particular, an IC chip is provided on the back surface of the ID card 10.

The regions a to d are printed on the card substrate 11 by a thermal transfer method by a thermal transfer printer having a predetermined dpi (resolution). On the other hand, the frames and ruled lines around the areas a to d are formed on the card substrate 11 in advance by a printing method other than the thermal transfer method (for example, letterpress printing) before printing the areas a to d. , Called the pre-printed part.

FIG. 5A is an enlarged example of a part of the character printed portion of the ID card 10, and in the present embodiment, a large number of step portions B are formed on the character line. The step portion B is a substantially L-shaped portion generated in the contour portion of the line, and is formed in units of several tens of μm by printing the characters by a thermal transfer method. The step portion B is formed particularly prominently at the curved or diagonally lined portion of the character.

On the other hand, when characters are printed by an inkjet printer, the lines are smooth and no clear steps are formed as shown in FIG. 5 (b).

FIG. 6 is an enlarged view showing a range A at the upper left end of the card in FIG. 4 as a pre-printed portion on the card base material 11. In the present embodiment, the pre-printed portion is formed by letterpress printing, but also in this case, no clear step is formed in the pre-printed portion, and the line becomes smooth.

(3. Printing of ID card 10 by thermal transfer method)
Printing by the thermal transfer method is performed by the thermal transfer printer 100 shown in FIG. 7 (a). In the thermal transfer printer 100, while the thermal transfer ribbon 200 wound around the supply reel 101 is unwound and conveyed, heat is applied to the thermal transfer ribbon 200 by the thermal head 110 in the middle of the process, and the transfer layer is transferred to the card substrate 11. The thermal transfer ribbon 200 after transfer is wound on the take-up reel 102.

FIG. 7B is an example of the transfer layer 202 of the thermal transfer ribbon 200, and each transfer layer 202 of Y (yellow), M (magenta), C (cyan), K (black), and P (overcoat layer) is They are arranged surface-sequentially on the substrate of the thermal transfer ribbon 200.

Monochrome printing of characters is performed by transferring the K (black) transfer layer 202 to the card substrate 11 while transporting the card substrate 11. As shown in FIG. 8A, the thermal head 110 applies heat to the thermal transfer ribbon 200 from the thermal head element 111 provided on the lower surface thereof.

FIG. 8B is a view of the lower surface of the thermal head 110. As shown in FIG. 8B, a plurality of thermal head elements 111 are arranged side by side on the lower surface of the thermal head 110. The plane of the thermal head element 111 has a rectangular shape, and its vertical and horizontal lengths are constant.

Here, the arrangement direction of the thermal head elements 111 is referred to as a main scanning direction, and corresponds to the paper surface normal direction in FIG. 8A and the vertical direction in FIG. 8B. On the other hand, the direction orthogonal to the main scanning direction on the plane is called the sub-scanning direction, and corresponds to the left-right direction of FIGS. 8A and 8B. 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, and the larger the dpi, the shorter the Dm and Ds.

In the present embodiment, the main scanning direction of the thermal head element 111 corresponds to the short side direction of the ID card 10 (hereinafter referred to as the card short side direction), and the sub scanning direction corresponds to the long side direction of the ID card 10 (hereinafter referred to as the card length). It shall correspond to the side direction).

When the thermal head element 111 applies heat to the range C of the transfer layer 202 in FIG. 8A, the transfer layer 202 in this range adheres to the card base material 11, and the thermal transfer ribbon 200 is wound on the take-up reel 102. When it separates from the card base material 11, it peels off from the base material 201 of the thermal transfer ribbon 200. As a result, the transfer layer 202 is transferred onto the card base material 11, 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 FIG. 8 (c), the outline portion of the line is a step portion derived from the thermal head element 111. Is formed.

The steps a1 to a6 in the main scanning direction of the step portion are approximately 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, the steps b1 to b6 in the sub-scanning direction of the step portion are often not an integral multiple of the length Ds in the sub-scanning direction of the thermal head element 111. This means that even if heat is applied to a certain range C of the transfer layer 202 by the thermal head element 111, the length W of the transfer layer 202 peeled off from the thermal transfer ribbon 200 in the sub-scanning direction (see FIG. 8A). This is because there are variations.

Note that FIG. 9 is an example of color printing of an image. In this case, when the thermal head element 111 applies heat to the range C'of the transfer layer 202, the transfer layer 202 in this range C'is the card base material. The transfer layer 202 is transferred to the card substrate 11 by heat diffusion to the receiving layer 12 provided on the card 11. The transfer layer 202 can be transferred in 256 gradations, and the color of the image is transferred by transferring the transfer layers 202 of Y, M, and C to predetermined positions on the card substrate 11 while reciprocating the card substrate 11. Printing is done.

(4. Outline of processing of authenticity determination system 1)
FIG. 10 is a flowchart showing an outline of the processing of the authenticity determination system 1. S1 to S3, S7 to S9, and S14 to S16 in FIG. 10 are processes executed by the computer 23 of the reading device 2, and S4 to S6, S10 to S13, and S17 to S19 are executed by the control unit 31 of the authenticity determination device 3. It is a process to do. The process of FIG. 10 is started by, for example, setting the ID card 10 at a designated position and transmitting an instruction to start the process from the authenticity determination device 3 to the reading device 2.

In the present embodiment, the reading device 2 first captures the surface of the ID card 10 with the camera 22 (S1), temporarily stores the captured image of the ID card 10, and compresses the captured image of the ID card 10 (S2). , The compressed image (compressed image) is transmitted to the authenticity determination device 3 (S3).

The reason why the compressed image is transmitted to the authenticity determination device 3 instead of the captured image in S3 is that the OCR processing of S5, which will be described later, can be sufficiently performed by the compressed image, thereby reducing the transfer time and processing in the reading device 2. It can save time and keep the battery for a long time. In the present embodiment, the resolution of the captured image is 1200 dpi and the resolution of the compressed image is 300 dpi, but the present invention is not limited to this.

When the authenticity determination device 3 receives the compressed image (S4), the compressed image is subjected to OCR processing, a specific character is searched for, and the compressed image is extracted (S5). When the authenticity determination device 3 extracts a specific character, the authenticity determination device 3 transmits the position information of the character portion to the reading device 2 (S6).

In the present embodiment, the search for a specific character is performed on the predetermined areas a to c (see FIG. 4) on the ID card 10. The search order of each area a to c can be predetermined. For example, if a search is performed in order from the area a near the center to the area b outside the area b and the area c, and a predetermined number of specific characters are extracted, the characters are extracted. To finish. The reason why the central region a is searched first is that the peripheral portion of the image captured by the camera 22 is distorted as compared with the central region, and the accuracy is lowered. Here, for the sake of simplicity of explanation, the above predetermined number is set to 1.

The specific character is not particularly limited, but in the present embodiment, since the authenticity is determined by the step portion of the character line as described later, “0”, “8”, and “3” having a curve or diagonal line where the step portion is likely to appear. Characters such as "2" and "4" are desirable.

When the reading device 2 receives the position information of the character portion (S7), the reading device 2 cuts out the character portion from the original captured image based on the position information (S8), and transmits the image of the character portion to the authenticity determination device 3 (S7). S9). The dpi of this image is 1200dpi, which is the same as the original captured image.

When the authenticity determination device 3 receives the image of the character portion (S10), the authenticity determination device 3 determines the authenticity of the ID card 10 based on the character portion (S11). The details of this authenticity determination will be described later. When the determination result is OK or NG (S12; OK or NG), the authenticity determination device 3 displays the determination result on the display unit 33 (S19), and ends the process.

On the other hand, when the determination result is undecidable (S12; undecidable), the authenticity determination device 3 transmits an image request for the pre-printed portion to the reading device 2 (S13).

When the reading device 2 receives the image request of the pre-printed portion (S14), the pre-printed portion is cut out from the original captured image (S15), and the image of the pre-printed portion is transmitted to the authenticity determination device 3 (S16). The dpi of this image is 1200dpi, which is the same as the original captured image. The pre-printed portion can be common among the ID cards 10, and in S15, a predetermined portion of the captured image may be cut out. This portion is, for example, the range A at the upper left corner of the card in FIG. 4, but is not limited to this.

When the authenticity determination device 3 receives the image of the pre-printed portion (S17), the authenticity determination device 3 determines the authenticity of the ID card 10 by the pre-printed portion (S18). The details of this authenticity determination will be described later. The authenticity determination device 3 displays the determination result on the display unit 33 (S19), and ends the process.

By looking at the determination result displayed on the display unit 33 of the authenticity determination device 3 by the above processing, it can be known whether the ID card 10 is a legitimate one or a forged one. 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 or not it is a positive IC chip that has not been forged. A reliable authenticity judgment is possible.

(5. Authenticity judgment processing)
Next, the procedure of the authenticity determination process in S11 and S18 will be described.

(5-1. Authenticity judgment by character part)
FIG. 11 is a flowchart showing the authenticity determination process using the character portion of S11, and each step in the figure is executed by the control unit 31 of the authenticity determination device 3.

In S11, the authenticity determination device 3 first detects the step portion of the character line from the image of the character portion (S111).

The method of detecting the step portion is not particularly limited, but for example, using a template with line segments in the short side direction of the card and the long side direction of the card orthogonal to the L-shape, the image of the character part is binarized and extracted. If there is a part in the contour part that has a high degree of matching with the template, that part is used as the step part.

The authenticity determination device 3 determines whether or not the characters are printed by the thermal transfer method by this step portion (S112), and determines a fake ID card based on the determination result. For example, if the number of detected steps is less than a predetermined value, it is assumed that the characters are not printed by the thermal transfer method (S112; No), and the ID card 10 is regarded as a fake ID card and is NG (S113). Although the stepped portion due to the shape of the character itself can be detected in S111, the number of the stepped portion is much smaller than that of the stepped portion derived from the thermal head element 111 (see, for example, B in FIG. 5A), and the character itself. The stepped portion due to the shape of the above does not affect the determination of S112.

On the other hand, in the authenticity determination device 3, for example, if the number of detected steps is equal to or greater than a predetermined value, it is assumed that the characters are printed by the thermal transfer method (S112; Yes), and the ID card 10 has a step in the predetermined direction of the step. Make an authenticity check.

In the present embodiment, the predetermined direction is the card short side direction, and corresponds to the main scanning direction of the thermal transfer printer 100. In the present embodiment, a value n · Dm (n) obtained by multiplying the step in the card short side direction of the step portion (see a1 to a6 in FIG. 8C) and the length Dm in the main scanning direction of the thermal head element 111 by an integral number. = 1,2,3 ...) is used to determine whether or not the characters are printed by the thermal transfer printer 100 (thermal transfer printer 100 used for printing the positive ID card 10) having a predetermined dpi (S114), and the determination thereof. The fake ID card is identified based on the result.

The determination of S114 can be performed, for example, by totaling the steps in the short side of the card in each step of the character line and based on the totaling result. FIG. 12 shows the aggregated result by a graph of frequency distribution in which the horizontal axis is a step and the vertical axis is the number of steps. In S114, for example, if a step portion having a step of n · Dm exists at a certain ratio or more with respect to the entire step portion, it is assumed that the character is printed by the thermal transfer printer 100 having a predetermined dpi. However, the determination method is not limited to this, for example, a scale having a straight line having a length of Dm, 2Dm, 3Dm ... There is also a method of determining whether or not there are several steps.

When the authenticity determination device 3 determines that the characters are not printed by the thermal transfer printer 100 having a predetermined dpi (S114; No), the ID card 10 is printed by the thermal transfer printer having a dpi different from the predetermined dpi. It is NG because it is a fake ID card (S115).

On the other hand, when the authenticity determination device 3 determines that the characters are printed by the thermal transfer printer 100 having a predetermined dpi (S114; Yes), the ID card 10 is printed by the thermal transfer printer 100 having a predetermined dpi. It is OK as if it is a true ID card (S116).

Further, when the authenticity determination device 3 cannot determine whether or not the characters are printed by the thermal transfer printer 100 having a predetermined dpi (S114; cannot be determined), the determination result is set to "undecidable" (S117). For example, as described above, when determining whether or not a step portion having a step of n · Dm exists in S114 at a certain ratio or more with respect to the entire step portion, the step portion having a step of n · Dm is included in the entire step portion. On the other hand, although it does not exist in a certain ratio, it cannot be determined in cases where the ratio is close to the ratio.

The determination results of S113, S115, and S116 are displayed in S19 of FIG. 10, and if the determination is impossible in S117, the process proceeds to the process after S13 of FIG. 10 as described above, and the authenticity determination by the pre-printed portion is added. Will do.

(5-2. Authenticity judgment by pre-printed part)
FIG. 13 is a flowchart showing the authenticity determination process by the pre-printed portion of S18, and each step in the figure is executed by the control unit 31 of the authenticity determination device 3.

In S18, the authenticity determination device 3 detects the stepped portion of the pre-printed portion (S181), determines whether or not the pre-printed portion is printed by the thermal transfer method by the stepped portion (S182), and determines the determination. The fake ID card is identified based on the result.

The method of detecting the step portion in S181 is the same as that of S111 described above. Further, the determination method of S182 is basically the same as that of S112 described above, but here, when it is determined that the pre-printed portion is printed by the thermal transfer method (S182; Yes), the ID card 10 is pre-printed. It is NG because the portion is a fake ID card printed by the thermal transfer method (S183). On the other hand, when it is determined in S182 that the pre-printed portion is not printed by the thermal transfer method (S182; none), the ID card 10 is OK because the pre-printed portion is a true ID card that is not printed by the thermal transfer method. (S184).

The determination results of S183 and S184 are displayed in S19 of FIG. In S182, the determination may not be possible due to reasons such as dust adhering to the pre-printed portion and the step portion cannot be accurately detected. In that case, another pre-printed portion (for example, the ID card 10) may not be determined. The image of the lower right corner, the lower left corner, the frame portion of the lower right corner, etc.) can be acquired again by the process of S13 to S17, and the authenticity determination process of S18 can be performed again using the image.

As described above, in the present embodiment, it is utilized that a step portion peculiar to the thermal transfer method derived from the thermal head element 111 of the thermal transfer printer 100 appears on the line of characters printed by the thermal transfer method, and the ID by this step portion is used. By determining the authenticity of the card 10, it is possible to determine that the ID card forged by the inkjet printer is false. This method can be applied even when there is no single-color filled area, and an ID card in which a character area is cut off with a cutter or the like and a false information is printed by an inkjet printer can be identified as false.

If the characters are printed by a printer other than the thermal transfer printer 100 such as an inkjet printer, the step portion does not appear on the line of the characters. Therefore, in the present embodiment, the ID card 10 can be determined to be false (FIG. 11). See S112).

Further, since the step of the step portion differs depending on the dpi of the thermal transfer printer 100, in this embodiment, by using this step for authenticity determination, a thermal transfer printer having a dpi different from that of the thermal transfer printer 100 used for printing the positive ID card 10 is forged. The ID card 10 prepared for use and forged using the ID card 10 can also be determined to be fake (see S114 in FIG. 11).

With respect to the above-mentioned step, the authenticity can be determined with high accuracy by using the step in the short side direction of the card corresponding to the main scanning direction of the thermal transfer printer 100. Since this step is a value n · Dm obtained by multiplying (including 1 times) the length Dm of the thermal head element 111 in the main scanning direction by an integral multiple (including 1 times), the determination can be suitably performed by using this value. The direction corresponding to the main scanning direction of the thermal transfer printer 100 may be the card long side direction of the ID card 10. In that case, the step in the card long side direction may be used for the determination.

Since characters such as an address, a name, and a date of birth are printed on the ID card 10 by the thermal transfer printer 100, the authenticity of the ID card 10 can be determined by the steps of these characters. In the present embodiment, by extracting a specific character having a curve or a diagonal line where a step portion is easily formed, the authenticity can be determined with high accuracy and efficiency, and a forgery in which this character is added with a ballpoint pen or the like can also be determined. Will be.

Further, in the present embodiment, the fake ID card 10 can be identified by utilizing the fact that the pre-printed portion of the ID card 10 is not printed by the thermal transfer method and the pre-printed portion does not have a step portion (see S182 in FIG. 13). .. In the present embodiment, the pre-printed portion formed by letterpress printing is used for authenticity determination, but if there is a printed portion printed by a printing method other than the thermal transfer method, the printed portion does not have a step portion as described above. Can be used for authenticity determination.

However, the present invention is not limited to this. For example, in order to improve the inspection accuracy, it is possible to perform authenticity determination using a plurality of characters. However, considering the processing time, it is desirable that the number of characters is about three. When a plurality of characters are used for the determination, the determination of S11 is performed for each character, and for example, when it is determined that all the characters are OK (see S116 in FIG. 11), the ID card 10 is regarded as true. However, the present invention is not limited to this, and the ID card 10 may be set to true, for example, when it is determined that a certain number of characters are OK.

Further, in the present embodiment, the monochrome-printed character line is used for the authenticity determination in S11, but it is also possible to use the pattern line or the like instead of the character for the authenticity determination in S11, and the color-printed line. May be used for authenticity determination. However, as described with reference to FIG. 9, color printing is performed by transferring each transfer layer 202 while reciprocating the card base material 11, so that if the card base material 11 is displaced in the main scanning direction during transportation, the accuracy of authenticity determination is correct. In this respect, it is more advantageous to use the monochrome printed line for the authenticity determination.

Further, in the present embodiment, the steps a1 to a6 in the direction corresponding to the main scanning direction of the thermal transfer printer 100 are used for authenticity determination, but in the sub-scanning direction of the peeled portion when the transfer layer 202 is peeled from the thermal transfer ribbon 200. If there is no variation in the length W (see FIG. 8A), the steps b1 to b6 in the direction corresponding to the sub-scanning direction of the thermal transfer printer 100 can be used for authenticity determination.

Further, although the reading device 2 and the authenticity determining device 3 are separate bodies in the present embodiment, it is also possible to perform the series of processes shown in FIG. 10 using only one terminal such as a tablet terminal having a camera.

Further, in the present embodiment, an example of performing the authenticity determination of the ID card 10 has been described, but the object of the authenticity determination is not limited to this, and at least a printed matter having a printed portion by a thermal transfer method can be applied.

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 these examples. It is clear that a person skilled in the art can come up with various modified or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1: Authenticity determination system 2: Reading device 3: Authenticity determination device 10: ID card 11: Card base material 12: Receiving layer 100: Thermal transfer printer 110: Thermal head 111: Thermal head element 200: Thermal transfer ribbon 202: Transfer layer

Claims (13)

An authenticity determination device that determines the authenticity of printed matter.
An authenticity determination device, characterized in that the authenticity of the printed matter is determined by the stepped portion of the line of the printed matter based on the image of the printed portion by the thermal transfer method of the printed matter. The authenticity determination device determines whether or not the printed portion is printed by a thermal transfer printer having a predetermined dpi based on a step in a predetermined direction of the step portion, and determines a fake printed matter based on the determination result. The authenticity determination device according to claim 1. The authenticity determination device according to claim 2, wherein the predetermined direction corresponds to the main scanning direction of the thermal transfer printer. In the authenticity determination device, whether the printed portion is printed by the thermal transfer printer having a predetermined dpi by using the step and the value obtained by multiplying the length of the thermal head element of the thermal transfer printer in the main scanning direction by an integral number. The authenticity determination device according to claim 3, further comprising determining whether or not to use the device. Claim 1 to claim 1, wherein the authenticity determination device determines whether or not the printed portion is printed by a thermal transfer method by the step portion, and determines a false printed matter based on the determination result. The authenticity determination device according to any one of 4. The authenticity determination device according to any one of claims 1 to 5, wherein the printed portion is a character. The authenticity determination device according to claim 6, wherein the authenticity determination device extracts a specific character used for the authenticity determination from a photographed image of the printed matter. The authenticity determination device according to any one of claims 1 to 7, wherein the printed matter is an ID card. The authenticity determination device further
Based on the image of the printed portion by a printing method other than the thermal transfer method of the printed matter, whether or not the printed portion is printed by the thermal transfer method is determined by the stepped portion of the line of the printed portion, and the determination result is false. The authenticity determination device according to any one of claims 1 to 8, wherein the printed matter is discriminated. A printed matter reader
In order for the authenticity determination device to determine the authenticity of the printed matter by the step portion of the line of the printed portion by the thermal transfer method of the printed matter, the image of the printed matter is cut out from the photographed image of the printed matter and transmitted to the authenticity determination device. A reader characterized by that. An authenticity determination system for printed matter having a reading device and an authenticity determination device.
The reading device is
An image of a printed portion printed by the thermal transfer method of the printed matter is cut out from the photographed image of the printed matter and transmitted to the authenticity determination device.
The authenticity determination device is
An authenticity determination system, characterized in that the authenticity of the printed matter is determined by the stepped portion of the line of the printed portion based on the image. Computer,
An authenticity determination device that determines the authenticity of printed matter.
A program for functioning as an authenticity determination device for determining the authenticity of the printed matter by the stepped portion of the line of the printed matter based on the image of the printed portion by the thermal transfer method of the printed matter. Computer,
A printed matter reader
In order for the authenticity determination device to determine the authenticity of the printed matter by the step portion of the line of the printed portion by the thermal transfer method of the printed matter, the image of the printed matter is cut out from the photographed image of the printed matter and transmitted to the authenticity determination device. A program to function as a reader.

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