JP2019074778A - Method of reading information recording medium and method of determining authenticity - Google Patents

Abstract

To provide a method capable of easily reading information of an information recording medium without searching for an angle to be imaged using a simple reading device such as a portable information terminal, and a method capable of determining authenticity from the read information.SOLUTION: In a method of reading information by imaging an information recording medium 10 provided with a structure 11 that emits return light, which is an object of authenticity determination, using a portable information terminal 1 provided with an imaging device 2 and a display screen 3 on the same surface, as means for illuminating the structure, an operation is performed to obtain information of the structure by imaging the structure illuminated by an illumination pattern 4 displayed at a certain position of the display screen using the imaging device. The operation ends when the information is obtained. When the information is not obtained, the information of the information recording medium is obtained by displaying an illumination pattern 5 at another position of the display screen and repeating a series of operations until the information of the structure is obtained.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technology for determining authenticity of an information recording medium. More specifically, the present invention relates to a reading method of an information recording medium that enables easy judgment of the authenticity of an information recording medium using a portable information terminal such as a smart phone, and a method of judging authenticity based on read information.

  Conventionally, in products such as banknotes, stock certificates, gift certificates, and other securities such as credit cards, and pharmaceuticals, foodstuffs, luxury brands, etc., an information recording medium is used to prevent unauthorized use by forgery / replication of the products. It is used. An information recording medium is directly printed or transferred to securities. Further, the product is provided with a sealing seal or a tag provided with an information recording medium.

  However, in recent years, these have been used to manufacture forged or copied information securities as well as forged or copied fraudulent securities and goods, and only genuine or fake products (illegal or forged or copied goods) with or without information recording media. It is difficult to determine whether or not.

  As an example of the above-described information recording medium, there is a diffraction grating, a hologram, or the like whose color or pattern changes depending on the observation angle. In addition, as another example of the information recording medium, there are an OVD (Optically Variable Device) ink, a pearl pigment, and the like in which color and brightness change.

  However, whether the information recording medium is true or false can be easily determined by comparison with a true information recording medium or by visual inspection of a specialist, but general users can easily forge it visually It is difficult to judge the authenticity of the prevention medium.

When the authenticity of the information recording medium can not be judged visually, a special authenticity judging device (see, for example, Patent Document 1) capable of strictly controlling the observation angle of the imaging device with respect to the information recording medium is used.
However, it is difficult for a general user to judge the authenticity of the information recording medium using such an apparatus because specialized knowledge and special instruments are required to handle the above-mentioned apparatus.

Further, when determining the authenticity of the information recording medium in which the optical change of the observed pattern occurs at a predetermined observation angle, the optical change of the observed pattern is different according to the observation angle. It is necessary to estimate the observation angle that determines the imaging direction of the device. Conventionally, a gyro sensor incorporated in an image pickup device is used to estimate the observation angle.
Furthermore, it is conceivable that the image pickup device captures an image of the information recording medium at an appropriate observation angle and observation position for detecting an observation angle and an observation position with a tilt sensor or the like and determining authenticity.

  However, a general user can not strictly grasp and manipulate the positional relationship between the image pickup apparatus and the information recording medium. For this reason, it is difficult to image the information recording medium by the image pickup device from an appropriate observation angle and position where the hologram can be imaged.

Also, the pattern to be observed changes depending on the relative observation angle and the observation position of the information recording medium with respect to the image pickup device. Therefore, in order to accurately determine the observation angle by the image pickup device with respect to the information recording medium, it is necessary to detect the angle and position of each of the image pickup device and the information recording medium. Therefore, it is necessary to mount the tilt sensor on both the imaging device and the information recording medium.

  In order to solve such a problem, for example, Patent Documents 2 to 4 do not use special authentication devices as in the prior art, and do not depend on the installation situation of the information recording medium, and use a versatile digital camera Using a simple reading device such as a smartphone or the like to easily capture a captured image used for authenticity determination (identification of real or fake objects) at an appropriate observation angle and observation position, and perform authenticity determination of the information recording medium Discloses an identification device and an identification method capable of

  However, in these technologies, when the appraiser performs authenticity determination using a portable information terminal such as a smartphone, strong return light is observed by tilting the portable information terminal and changing the observation angle of the information recording medium. It is necessary to capture an image while searching for a certain observation angle. Such work is difficult and time-consuming if the person is not familiar with this technology.

Patent No. 3865763 gazette Patent No. 6156586 gazette Patent No. 6098759 JP 2017-54290 A

  In view of the above circumstances, the present invention is a reading method capable of easily reading information of an information recording medium without searching for an angle to be imaged using a simple reading device such as a portable information terminal, It is an object of the present invention to provide an authenticity determination method capable of determining authenticity from read information.

As means for solving the above problems, according to a first aspect of the present invention, an information recording is provided on the surface with a structure that generates return light, using a portable information terminal provided with an imaging device and a display screen on the same surface. A method of reading information on the medium,
An arrangement step of arranging a face provided with a structure of an information recording medium and a face provided with an image sensor of a portable information terminal and a display screen facing each other;
And an imaging step of imaging the structure using an imaging element while displaying the illumination pattern in the display screen.

Further, according to a second aspect of the present invention, there is provided a method of reading information of an information recording medium provided with a structure generating return light on a surface thereof using a portable information terminal provided with an imaging device and a display screen on the same surface. There,
Placing the information recording medium in an imageable manner by arranging the face of the information recording medium having the structure and the face of the portable information terminal having the imaging device facing each other;
An illumination pattern display step of displaying an illumination pattern on at least a display screen;
An information recording medium imaging step of imaging the information recording medium by illumination light of the illumination pattern;
A position detection step of detecting the position of the structure by the portable information terminal performing arithmetic processing based on the image data of the structure imaged in the imaging step;
A position detection determination step of determining whether the position of the structure is detected in the position detection step;
When the position of the structure is detected in the position detection determination step, it is determined whether or not the detected position is an appropriate position, and when the position of the structure is not detected, the illumination pattern display step Step of determining the proper position back to
Reading information of a captured image;
An image information processing step of reading information recorded in the structure by performing image information processing on captured image information of the structure;
And ending the process when the information recorded in the structure can be acquired in the image information processing process, and returning to the illumination pattern display process when the information can not be acquired. Method of reading an information recording medium.

In the third aspect, the information recording medium according to the second aspect is characterized in that the structure includes two or more types of different diffraction grating structures, and at least a part of which includes a reflective layer. Is the reading method of
The position of the structure of the information recording medium can be easily detected by providing two or more types of different diffraction grating structures and by providing a reflection layer on a part of the structure.

A fourth aspect is the method for reading an information recording medium according to the second or third aspect, wherein the light emitted from the illumination pattern is polarized.
When a liquid crystal display device is used as the display screen, the light emitted from the illumination pattern displayed on the display screen is polarized, so that the structure detection and information acquisition can be performed.

A fifth aspect is a method of determining authenticity of an information recording medium provided with a structure generating return light on a surface thereof, using a portable information terminal provided with an imaging device and a display screen on the same surface,
Placing the information recording medium in an imageable manner by arranging the face of the information recording medium having the structure and the face of the portable information terminal having the imaging device facing each other;
An illumination pattern display step of displaying an illumination pattern on the display screen;
An information recording medium imaging step of imaging the information recording medium by illumination light of the illumination pattern;
A position detection step of detecting the position of the structure by the portable information terminal performing arithmetic processing based on the image data of the structure imaged in the imaging step;
A position detection determination step of determining whether the position of the structure is detected in the position detection step;
When the position of the structure is detected in the position detection determination step, it is determined whether or not the detected position is an appropriate position, and when the position of the structure is not detected, the illumination pattern display step Step of determining the proper position back to
If the position of the structure is determined to be correct in the proper position determination step, the correct image information of the structure is read, and if it is determined that the position is not correct, the correct image to return to the illumination pattern display step Information reading process,
Reading information of a captured image;
An image information processing step of reading information recorded in the structure by performing image information processing on captured image information of the structure;
If the information recorded in the structure can be acquired in the image information processing step, the process ends. If the information can not be acquired, the information acquisition determination step of returning to the illumination pattern display step;
A step of reading correct image information when information can be acquired in the information acquisition determination step;
And a step of comparing the obtained image information with the correct image information to determine the authenticity.

  Further, in a sixth aspect, the step of performing the authenticity determination determines that a case where an absolute value of a difference between the acquired image information and the correct image information exceeds a preset threshold as a threshold and is equal to or less than the threshold It is the authenticity determination method according to the fifth aspect, characterized in that the case is determined as true.

In the seventh aspect, the step of performing the authenticity determination calculates the similarity between the acquired image information and the correct image information, and determines that the case where the similarity is equal to or greater than a preset threshold is true. It is the authenticity determination method according to the fifth aspect, characterized in that the case below the threshold is determined to be decoy.

  In addition, according to an eighth aspect, in any one of the fifth to seventh aspects, the correct image information is stored in the portable information terminal or a server accessible via the Internet. Is a method of judging authenticity of

  According to the reading method of the information recording medium of the present invention, when reading the information recording medium using the reading device, instead of searching for the angle to be imaged, the illumination pattern displayed on the display screen of the portable information terminal By changing the position on the display screen and emitting illumination light, it becomes possible to fix and read the positional relationship between the information recording medium and the portable information terminal. Therefore, the information recording medium can be easily read even if it is not an expert such as an expert. Moreover, based on the read information, it is possible to determine the authenticity.

It is explanatory drawing which illustrates the reading method of the information recording medium of this invention, Comprising: The arrangement | positioning relationship between an information recording medium and a reader, the incident light to a structure from the pattern for illumination displayed on the display screen of a reader, The relationship between return light and reflected light emitted from the structure by the incident light is shown, and an example in which the return light is incident on the image pickup element of the reader and an example in which the return light is not incident are shown. It is a flow figure which illustrates the work flow of the reading method of the information recording medium of this invention. It is a flowchart which illustrates the work flow of the authenticity determination method of the information recording medium of this invention. It is a flow figure which illustrates the work flow of the reading method of the information recording medium of this invention.

  The present invention relates to a method of reading information recording medium for acquiring information recorded in a structure emitting return light provided in an information recording medium using a portable information terminal such as a smart phone, the acquired information, and authenticity. It is the authenticity determination method which performs authenticity determination by comparing with the correct image information which shows that it is goods.

  Here, the return light refers to the light emitted from the structure when the structure is irradiated with the illumination light. As a mechanism for generating return light, not only a mechanism for generating diffraction light by a diffraction grating such as a concavo-convex structure of a surface causing scattering or a hologram or a diffraction grating element, a structure exhibiting various structural colors can be applied. . For example, a structural color such as a thin film of about the wavelength of light, a multilayer interference film, a fine concavo-convex structure, or a fine particle corresponds.

A method of reading information recording medium according to the present invention is a method of reading information of an information recording medium provided with a structure generating return light on a surface using a portable information terminal provided with an imaging device and a display screen on the same surface. is there.
An arrangement step of arranging the surface of the information recording medium having the structure and the surface of the portable information terminal having the image sensor and the display screen facing each other, and an illumination pattern smaller than the display screen in the display screen It is characterized by comprising an imaging step of imaging a structure using an imaging element while changing a position to be displayed, and an authenticity determination step of comparing a captured image captured in the imaging step with a correct image. is there.

The reading method of the information recording medium of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is an explanatory view exemplifying an arrangement relationship between an information recording medium 10 and a portable information terminal 1 for imaging the information recording medium 10 and reading information when the method for reading an information recording medium of the present invention is implemented. .

The portable information terminal 1 is provided with an imaging device 2 and a display screen 3 for displaying information on the same side of the portable information terminal 1. The imaging element 2 of the portable information terminal 1 is disposed at a position where the information recording medium 10 can be imaged. Usually, it is arranged above the information recording medium 10. Further, in a state in which the portable information terminal 1 is disposed substantially in parallel with the plane on which the information recording medium 10 is placed, imaging is performed substantially fixed.

  At the time of imaging, first, the structure 11 provided in the information recording medium 10 is illuminated. The illumination is performed by the illumination pattern displayed on the display screen 3 of the portable information terminal 1. In FIG. 1, the illumination pattern a4 and the illumination pattern b5 are illustrated. These illumination patterns are displayed one by one to illuminate the information recording medium 10 and image the information recording medium 10 each time. The illumination pattern a4 and the illumination pattern b5 are displayed at different positions on the display screen 3. By this, it is possible to implement the same as illuminating the information recording medium 10 from different angles.

  Specifically, for example, the illumination pattern a4 is displayed, and the information recording medium 10 is imaged. At that time, incident light 12 is incident on the structure 11 of the information recording medium 10 from the illumination pattern a4. The return light 12B for the incident light 12 is imaged by the imaging element 2 and bright image information is acquired. The reflected light 12A with respect to the incident light 12 does not enter the imaging element 2 and is not imaged.

  Next, the illumination pattern b5 is displayed, and the information recording medium 10 is imaged. At this time, incident light 13 is incident on the structure 11 of the information recording medium 10 from the illumination pattern b5. Since the return light 13B for the incident light 13 does not enter the imaging element 2, dark image information is acquired. The reflected light 13A with respect to the incident light 13 does not enter the imaging element 2 and is not imaged.

  When the illumination is performed by the illumination pattern displayed on the display screen 3 of the portable information terminal 1, the imaging element 2 is changed while changing the position at which the illumination pattern smaller than the display screen 3 is displayed in the display screen 3. Although the case of imaging the structure 11 is described as an example, the illumination pattern may be, for example, all or part of the display screen as one illumination pattern.

  In this way, correct image information indicating that the image information such as brightness and color of the structure 11 to be imaged and the information on the angle between the illumination pattern and the structure 11 are genuine products stored in advance. It is possible to determine whether the product is authentic or not by comparing it with.

<Method of reading information recording medium>
Next, the method of reading the information recording medium will be described in more detail using the flowchart shown in FIG.
In the method of reading information recording medium of the present invention, when reading is started, the information recording medium is read through each step of S1 (step 1) to S9 (step 9).

(S1: Display of lighting pattern)
First, the illumination pattern is displayed on the display screen of the portable information terminal.
The illumination pattern displayed here may sequentially display the illumination pattern having a preset constant shape at a preset position on the display screen. In order to obtain the minimum image information to determine whether the image matches the correct image, the display position of the illumination pattern corresponding to the angle displayed brightly in the correct image and the other position It is good to examine only two points. In addition, an illumination pattern of any shape may be displayed at any position on the display screen.

(S2: Imaging of an information recording medium)
Next, the portable information terminal captures an image of the information recording medium illuminated by the illumination pattern through the imaging device, acquires the information recording medium as captured image information of the information recording medium, and stores the information in the storage device. The storage device may be inside the portable information terminal or may be stored in an externally accessible storage device.

(S3: Position detection of structure)
Next, based on the image information acquired by the portable information terminal, the coordinates (X, Y, Z) in the three-dimensional space of the structure provided in the information recording medium are detected.
There are several ways to detect coordinates. For example, information about the size of the information recording medium is stored in advance, and the distance between the information recording medium and the portable information terminal and the coordinates in three-dimensional space (X, Y, Z, Can be calculated. It can be implemented by installing such processing program on a portable information terminal. Moreover, you may use the portable information terminal provided with the distance sensor. Further, means for arranging the portable information terminal at a predetermined distance from the information recording medium may be used. Other means may be used.

(S4: Determination of whether or not the position of the structure has been detected)
Next, it is determined whether the position of the structure has been detected. If the position of the structure is detected, the process proceeds to S5. If the position of the structure can not be detected, the process advances to step S1 to execute steps S1 to S3.

(S5: determination of whether the detected position is appropriate)
Next, it is determined whether the position of the structure detected in S4 is appropriate. If the position of the detected structure is correct, the process proceeds to S7. If the position of the detected structure is not correct, the process proceeds to S1, and S1 to S4 are executed.

(S7: Reading of captured image information)
Next, the storage device in which the captured image information acquired in S2 is stored is accessed to read out the captured image information. The captured image information includes position detection image information for position detection and verification image information for reading information / judging determination. An image dedicated to alignment can be used as the position detection image information.

(S8: Image information processing)
Next, position information and color information are acquired from the correct image information read out from the storage device and the captured image information that is the object of determination of authenticity.
Therefore, the following processing is performed.
-Correct distortion of captured image information and calculate position information.
Calculate color information in a range in a preset structure.
-Calculated color information using color information in another range in the structure (a different place in one captured image) or color information obtained from another image in a plurality of captured images ,to correct.

(S9: Determination of whether or not information has been acquired)
Next, in S8, it is determined whether the corrected position information and color information have been acquired. If acquired, it ends. If it is not acquired, the process proceeds to S1, and S1 to S8 are executed.

The flow chart showing the reading method of the information recording medium may be the flow chart shown in FIG.
That is, when reading is started, the information recording medium can be read through the steps of S1 '(step 1') to S9 (step 9).

(S1 ': Display of position detection image)
It is equivalent to S1 in FIG.

(S2: Imaging of an information recording medium)
It is equivalent to S2 in FIG.

(S3: Position detection of structure)
It is equivalent to S3 in FIG.

(S4: Did you detect the position?)
It is equivalent to S4 in FIG.

(S5: Determination of proper position)
This is equivalent to S5 in FIG.

(S6: Display of verification image)
Display the verification image on the display screen.

(S7 ': imaging of the information recording medium)
An information recording medium is imaged by an imaging device.

(S8: Image information processing)
This is equivalent to S8 in FIG.

<Authentication method>
Next, a method of performing an authenticity determination on the basis of the corrected captured image information and the correct image information acquired by the information recording medium reading method of the present invention will be described.

  Since the method of judging authenticity of the present invention is the same as the work flow diagram of the method of reading the information recording medium as shown in FIG. 3 up to S9, the description will be omitted.

(S10: Reading correct image information)
The storage device in which the correct image information of the structure is stored is accessed to read out the correct image information.

(S11: Comparison of captured image information and correct image information)
The position information and color information of the structure calculated by the image information processing of S8 are compared with the position information and color information of the correct image information.

  As a comparison method, it is possible to compare by taking the difference between the position (coordinates) of the structure of the information recording medium to be inspected and the color (RGB intensity: intensity of brightness of red, green, blue). .

  For example, it is possible to calculate the deviation between the coordinates of the structure in the correct image information (coordinates in the plane parallel to the plane on which the information recording medium is placed) and the coordinates of the structure in the captured image information to be inspected. Further, the difference between the correct image information and the imaging can be calculated by digitizing the difference in intensity of the red, green and blue colors, and the calculated values The comparison becomes possible by setting a threshold as a reference of the authenticity determination. However, it is not meant to be limited to such a method.

(S12: authenticity judgment)
Using the numerical difference acquired in S11, it is judged whether the difference is within a preset threshold value or not. If it is within the threshold, it is determined as true, and if it exceeds the threshold, it is determined as 贋.

1 ・ ・ ・ Reading device (portable information terminal)
2 ··· Image pickup element 3 ··· Display screen 4 · · · Pattern for illumination a
5 ・ ・ ・ lighting pattern b
10 ... information recording medium 11 ... (the return light is generated) structure 12 ... (from the illumination pattern a to the (the return light is generated) structure) incident light 12A ... (the illumination pattern Reflected light 12B (from the structure (producing return light) to the light from the illumination pattern a) (from the structure (generates return light)) to the light from a Light 13A ... (from the structure (for return light) to the light from the illumination pattern b) from the pattern b (for the return light) (for illumination) (for illumination) Return light from the structure (which produces return light) to the light from pattern b

Claims (8)

A method of reading information of an information recording medium provided with a structure producing return light on a surface thereof using a portable information terminal provided with an imaging device and a display screen on the same surface,
An arrangement step of arranging a face provided with a structure of an information recording medium and a face provided with an image sensor of a portable information terminal and a display screen facing each other;
And an imaging step of imaging the structure using an imaging element while displaying the illumination pattern on the display screen. A method of reading information of an information recording medium provided with a structure producing return light on a surface thereof using a portable information terminal provided with an imaging device and a display screen on the same surface,
Placing the information recording medium in an imageable manner by arranging the face of the information recording medium having the structure and the face of the portable information terminal having the imaging device facing each other;
An illumination pattern display step of displaying an illumination pattern on at least a display screen;
An information recording medium imaging step of imaging the information recording medium by illumination light of the illumination pattern;
A position detection step of detecting the position of the structure by the portable information terminal performing arithmetic processing based on the image data of the structure imaged in the imaging step;
A position detection determination step of determining whether the position of the structure is detected in the position detection step;
When the position of the structure is detected in the position detection determination step, it is determined whether or not the detected position is an appropriate position, and when the position of the structure is not detected, the illumination pattern display step Step of determining the proper position back to
Reading information of a captured image;
An image information processing step of reading information recorded in the structure by performing image information processing on captured image information of the structure;
And ending the process when the information recorded in the structure can be acquired in the image information processing process, and returning to the illumination pattern display process when the information can not be acquired. How to read information recording media.   2. The method according to claim 1, wherein the structure comprises two or more different diffraction grating structures, and at least a part of which comprises a reflective layer.   The method according to claim 1 or 2, wherein the light emitted from the illumination pattern is polarized light. A method for determining the authenticity of an information recording medium having a structure on the surface that produces return light, using a portable information terminal having the same surface as the imaging device and the display screen.
Placing the information recording medium in an imageable manner by arranging the face of the information recording medium having the structure and the face of the portable information terminal having the imaging device facing each other;
An illumination pattern display step of displaying an illumination pattern on the display screen;
An information recording medium imaging step of imaging the information recording medium by illumination light of the illumination pattern;
A position detection step of detecting the position of the structure by the portable information terminal performing arithmetic processing based on the image data of the structure imaged in the imaging step;
A position detection determination step of determining whether the position of the structure is detected in the position detection step;
When the position of the structure is detected in the position detection determination step, it is determined whether or not the detected position is an appropriate position, and when the position of the structure is not detected, the illumination pattern display step Step of determining the proper position back to
If the position of the structure is determined to be correct in the proper position determination step, the correct image information of the structure is read, and if it is determined that the position is not correct, the correct image to return to the illumination pattern display step Information reading process,
Reading information of a captured image;
An image information processing step of reading information recorded in the structure by performing image information processing on captured image information of the structure;
If the information recorded in the structure can be acquired in the image information processing step, the process ends. If the information can not be acquired, an information acquisition determination step of returning to the illumination pattern display step;
A step of reading correct image information when information can be acquired in the information acquisition determination step;
And a step of comparing the obtained image information with the correct image information to perform an authenticity determination.   The step of performing the authenticity determination determines that a case where the absolute value of the difference between the acquired image information and the correct image information exceeds a preset threshold is a habit and a case where it is less than a threshold is true. The authenticity determination method according to claim 5 characterized by the above-mentioned.   The step of performing the authenticity determination calculates the degree of similarity between the acquired image information and the correct image information, and determines that the case where the similarity is equal to or greater than a preset threshold is true, and determines that the degree is less than the threshold A method of judging authenticity according to claim 5, characterized in that:   The method according to any one of claims 5 to 7, wherein the correct image information is stored in the portable information terminal or a server accessible via the Internet.

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