JP6237016B2 - smartphone - Google Patents

Description

  The present invention relates to an identification method and an identification apparatus that facilitate verification of an anti-counterfeit medium in which an image or color changes when an angle changes using an optical change.

  Conventionally, in addition to securities such as banknotes, stock certificates, gift certificates, credit cards, etc., to prevent unauthorized use due to counterfeiting or duplication, such as sealing seals and tags for products, printing by sophisticated printing technology etc. In general, in view of the frequent occurrence of unauthorized use due to counterfeiting or duplication in recent years, in addition to these sophisticated printing, anti-counterfeiting measures have been taken by optical changes such as special inks and diffraction gratings. It has come to be.

  For example, by transferring a diffraction grating whose image changes depending on the viewing angle, or by printing OVD (Optically Variable Device) ink or pearl pigment ink whose color or brightness changes on a paper surface, etc. A method that cannot be easily counterfeited by a copier is used. However, although it can be easily discriminated if it is compared with the genuine product or viewed by an expert, it is difficult to judge authenticity easily even by ordinary people.

  In the case of a hologram, in order to confirm it, by changing the angle and looking at the concave and convex portions of the hologram, a plurality of images are confirmed to confirm the authenticity, but confirmation is made toward two predetermined angles. However, it took a lot of time to verify the authenticity.

  Therefore, a reflective prism for irradiating a medium with a hologram positioned below and refracting the reflected light in two directions from the hologram and refracting it upward in the same direction or substantially in one direction is used as a case. By providing, an inspection device has been developed that can quickly and reliably visually recognize two images of the diffraction grating from above the inspection device, and can quickly and reliably check the authenticity of a medium equipped with a hologram (patent) Reference 1).

Japanese Patent No. 38655763

  However, there is a problem that an inspection device having a prism that is not general-purpose for a general person must be prepared for authenticating a medium including a hologram.

  The present invention has been made paying attention to the above problems, and authenticity determination is performed by using an angle sensor and an image pickup device included in an image device such as a camera or a portable camera of a commonly used portable information terminal. The challenge is to make it easier.

As a means for solving the above problems, the invention according to claim 1, the angle by a method of smartphone performs to help determine the medium for preventing forgery optical change occurs, as the smart phone, image A first step of generating an imaging instruction when the imaging unit satisfies an imaging condition, using a smartphone including an imaging unit that acquires the angle and an angle sensor that measures an angle of the imaging unit; Includes a second step of generating an imaging instruction when the imaging unit satisfies imaging conditions with different angles, and a step of displaying at least two or more captured images side by side so that a person can easily discriminate them. It is the identification method characterized by these.
The invention according to claim 2 is a method executed by a smartphone to facilitate discrimination of a forgery prevention medium whose color changes according to an angle, and as the smartphone , an imaging unit that acquires an image, and an imaging unit The first step of generating an imaging instruction when the imaging unit satisfies the imaging condition using the smartphone provided with the angle sensor that measures the angle of the imaging unit, and the imaging unit having an imaging condition different in angle from the first step The second step of generating an imaging instruction when the condition is satisfied, and whether or not a hue change due to an angle has occurred from the output signal of a predetermined portion of the two captured images, and the determination result And a step of displaying.
The invention according to claim 3 includes a step of illuminating the object in the vicinity of the imaging unit and irradiating the object from the same direction as the imaging side in response to the imaging instruction. The identification method according to claim 1, wherein:
The angle of the angle sensor of the imaging condition of the first step is the angle of the imaging condition, where θ is an angle formed between the normal line of the smartphone and the forgery prevention medium. 4. The identification according to claim 1, wherein 70 ° ≦ θ ≦ 110 °, and an angle of the angle sensor in the imaging condition of the second step is 20 ° ≦ θ ≦ 60 °. Is the method.
The invention according to claim 5 is a smartphone for easily identifying a forgery prevention medium in which an optical change occurs depending on an angle, and as the smartphone , measures an angle of an imaging unit that acquires an image and an imaging unit. using a smartphone and a angle sensor, when a first step of generating a capturing instruction, the first step of the angle is different imaging conditions by the imaging unit satisfies when the imaging unit satisfies the imaging condition is a smartphone and executes a second step of generating the imaging instruction, the step of at least 2 points or more images people are displayed side by side in order to help determine that captured.
The invention according to claim 6 is a smartphone for facilitating discrimination of a forgery prevention medium whose color changes according to an angle, and as the smartphone , measures an angle of an imaging unit that acquires an image and an imaging unit using a smartphone and a angle sensor, when a first step of generating a capturing instruction, the first step of the angle is different imaging conditions by the imaging unit satisfies when the imaging unit satisfies the imaging condition A second step of generating an imaging instruction, and a step of determining authenticity based on whether or not a hue change due to an angle has occurred from an output signal of a predetermined portion of the two captured images and displaying the determination result It is the smart phone characterized by performing.
According to a seventh aspect of the present invention, the imaging unit includes illumination in the vicinity of the imaging unit, and executes a step of irradiating the object in the same direction as the imaging side in response to the imaging instruction. It is a smart phone of Claim 5 or 6 characterized by the above-mentioned.
Further, in the invention according to claim 8, the angle of the imaging conditions of the first step is an angle of the imaging condition, where θ is an angle formed between the normal line of the smartphone and the anti-counterfeit medium. a is 70 ° ≦ θ ≦ 110 °, smartphones according to any one of claims 5 to 7 the angle of the angle sensor of the imaging conditions of the second step is characterized in that it is a 20 ° ≦ θ ≦ 60 ° It is.

  Since the present invention is configured as described above, the following effects can be obtained.

  In an angle sensor and an image capturing device included in an image device such as a camera of a portable information terminal or a portable camera that is normally used, the image capturing device is used as a capturing unit, the first image capturing instruction to the capturing unit, and the first An imaging instruction for a second image having a different angle from the image is generated. That is, according to this configuration, for example, an imaging instruction can be generated based on the measurement value of the angle sensor under appropriate conditions, and authenticity can be identified and determined based on the two captured images. Can do. That is, with a general-purpose image device, imaging at different angles can be easily performed, and the presence or absence of an optical change due to the angle can be easily identified for a target anti-counterfeit medium.

It is the block diagram which showed the example of a structure of the identification device for describing one Embodiment of this invention. It is a block diagram for demonstrating the imaging part which showed the example of a structure shown in FIG. 3 is a flowchart for explaining an operation example of a control unit shown in FIG. 1. 6 is a flowchart for explaining another example of the operation of the control unit shown in FIG. 1. It is explanatory drawing for demonstrating the example of the angle which image | photographs a target object using the identification apparatus shown in FIG. 1 of this invention. It is explanatory drawing for demonstrating the other example of the angle which image | photographs a target object using the identification apparatus shown in FIG. 1 of this invention.

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

  FIG. 1 is a block diagram showing a configuration example of an identification device 1 for explaining an embodiment of the present invention. The identification device 1 of the present invention operates by a program called an identification program, and includes an imaging unit 11, a control unit 12, an angle sensor 13, and a display unit 14, and also includes an illumination unit 15 as necessary. . The imaging unit 11 sequentially displays images until the imaging conditions are met, and displays on the display unit 14 that imaging (shutter release) is possible when the imaging conditions are met.

  FIG. 2 is a block diagram for explaining a configuration example of the imaging unit shown in FIG. The imaging unit 11 includes an imaging device 23 and an exposure control unit 24. The exposure control unit 24 includes a shutter speed control unit 25 and an aperture value control unit 26. The imaging unit 11 includes an angle of the imaging unit 11. Is provided with an angle sensor 13. The imaging unit 11 is desirably provided with an illumination unit 15 as necessary. Further, the control unit 12 includes a storage unit 21 and a calculation unit 22.

  3 and 4 are flowcharts for explaining an example of the operation of the control unit shown in FIG. 1, and FIGS. 5 and 6 photograph an object using the identification device shown in FIG. 1 of the present invention. It is explanatory drawing for demonstrating the example of the angle to do.

  In the present invention, the imaging condition means a setting condition indicating how to capture an image. For example, the information represents the specifications at the time of imaging such as the shutter speed at the time of shooting, the aperture value, the sensitivity of the image sensor (ISO sensitivity). In addition, a predetermined range in which the value of the angle sensor 13 attached to the imaging unit 11 is entered by moving the identification device 2 by the identification person 2 is also included.

  The predetermined range in which the value of the angle sensor 13 should be entered can be set by the verification unit 301 of the forgery prevention medium 3. When the verification unit 301 optically changes depending on the angle and is made of ink containing a pigment in which mica is coated with a metal oxide, or when layers of layers having different refractive indexes are repeatedly laminated, or when it is made of cholesteric liquid crystal, etc. Can be considered. In this case, when the angle formed between the normal line of the imaging device and the forgery prevention medium is θ, the angle of the imaging condition of the first image is 70 ° ≦ θ ≦ 110 °, and the angle of the imaging condition of the second image is It is desirable that 20 ° ≦ θ ≦ 60 ° because the color change becomes large, but other angles may be used. Further, when the verification unit 301 is a diffraction grating, a suitable value can be appropriately set depending on the design of embossment of the diffraction grating, and the measurement angle is preferably up to 20 ° ≦ θ ≦ 160 °, and three points The above images may be compared.

  Further, the imaging conditions can include the presence / absence of illumination by the illumination unit 15 and the difference in illumination intensity as necessary. It is desirable to use predetermined values for the first and second images as the setting values for these imaging conditions. However, the setting values may be appropriately instructed. The illumination unit 15 is preferably integrated with the imaging unit 11. However, the color and the image may be changed by changing the angle of the illuminating unit 15, so that the angle of the illuminating unit 15 must be set in consideration of this.

  Note that the imaging unit 11 may be one that fixes a focal length at a telephoto or wide angle, or may be a variable one. In this case, for example, the focal length can be changed by the aperture value control unit 26 of the exposure control unit 24 in accordance with an instruction from the control unit 12 or the like. The aperture value control unit 26 may be provided with an autofocus function for automatically focusing on an object, or may be provided with a manual focus function.

  The illumination unit 15 is a device that illuminates the forgery prevention medium 3 that is an imaging target of the imaging unit 11. The illumination unit 15 performs predetermined illumination on the anti-counterfeit medium 3 in accordance with the instruction output by the control unit 12 so as to match the timing at which the imaging unit 11 captures an image. The illumination unit 15 may be a light emitting device that emits intense light in a short time toward an imaging target called a flash or a strobe, or may be a device that continuously emits predetermined light. Note that the predetermined illumination performed by the illumination unit 15 in response to the instruction on the imaging target means illumination that varies the presence or absence of light emission or the amount of light emission depending on the presence or absence of the instruction. That is, the illumination unit 15 emits strong light for a short time or increases the intensity of illumination in response to the instruction. The control unit 12 may detect the brightness from the image acquired by the imaging unit 11, or attach an illuminance sensor to the imaging unit 11, and issue an instruction for the intensity of illumination based on the brightness value. good.

  Note that the identification device 1 desirably includes the imaging unit 11, the control unit 12, and the angle sensor 13, but may be configured as a separate device for each element. As an example provided integrally, a part or all of an image device such as a camera of a portable information terminal or a portable camera is preferably the identification device 1, but the angle with the imaging unit 11 that is a part of the identification device 1 It can also be configured as a sensor 13.

  An example of the operation of the identification program will be described with reference to FIGS. For example, when the identifier 2 performs a predetermined instruction operation, the program starts (step 31). The discriminator 2 follows the instruction while looking at the display unit 14, and, as shown in FIG. 5, the normal line of the discriminator 1 and the forgery prevention medium 3 so that the verification unit 301 of the forgery prevention medium 3 enters the imaged range. The identification device 1 is held up so that the angle θ formed by becomes the angle 302 of the imaging condition of the first image (step 32). At this time, the angle θ formed by the normal line of the identification device 1 and the forgery prevention medium 3 is preferably 70 ° ≦ θ ≦ 90 °, but may be another angle.

  The identification device 1 acquires an image (step 33), verifies whether the brightness is suitable (step 34), and adjusts the brightness (step 35) if the brightness is outside the predetermined range, and acquires the image (step Return to 33). If the brightness is appropriate, it is verified whether the focus is appropriate (step 36). If it is out of the predetermined range, the focus is adjusted (step 37), and the process returns to image acquisition (step 33). Here, imaging conditions for other images may be defined and conditions may be added.

  If the focal point is within a suitable range, the value of the angle sensor 13 is acquired. It is verified whether the angle sensor 13 is a suitable value (step 39), and if it is outside the predetermined range, it is not suitable, and is displayed on the display unit 14 so that it can be recognized by the classifier 2 (step 40). The identifier 2 looks at the display unit 14 and corrects the angle of the identification device 1 according to the instruction (step 41). It is desirable that steps 32 to 39, which are adjustment of the operation and adjustment of the imaging unit, or steps 33 to 36, which are adjustment of the image, are sequentially repeated and displayed on the display unit 14 sequentially.

  When the angle sensor 13 is a suitable value and the imaging condition is satisfied, the control unit 12 of the identification device 1 enables imaging of the imaging unit 11 (can take a shutter) and instructs the display unit 14 to perform imaging. Is displayed (step 42). The identifier 2 who has seen the display unit 14 releases the shutter (step 43). The first image obtained by the imaging unit 11 is recorded in the storage unit 21 of the control unit 12 (step 44). Up to here is an example of acquiring the first image.

  Next, in order to acquire images at different angles, as shown in FIG. 6, the discriminator 2 causes the verification unit 301 of the anti-counterfeit medium 3 to enter the imaged range, and the normal line of the identification device 1 and the anti-counterfeit medium 3. The angle θ of the discriminating apparatus 1 is changed so that the angle θ formed by the angle θ becomes the angle 303 of the imaging condition of the second image (step 45). The angle 303 of the imaging condition of the second image is desirably 20 ° ≦ θ ≦ 60 °, but may be other angles as long as it is different from the angle 302 of the imaging condition of the first image. When the angle is 20 ° or less, the angle is too steep to make it difficult to see the color.

  The identification device 1 acquires an image with the imaging unit 11 (step 46), and adjusts the imaging condition (step 46 to step 50) in the same manner as the adjustment at the time of the first image acquisition (step 33 to step 37). After the adjustment, the value of the angle sensor 13 is acquired (step 51), and it is verified whether the value is suitable for the angle 303 of the imaging condition of the second image (step 52). In order to be recognized by the discriminator 2 if it is outside the predetermined range, for example, the display with an angle of NG is shown on the display unit 14 with characters, colors, symbols, etc. (step 53). The identifier 2 who sees this corrects the angle of the identification device 1 (step 54). When the angle sensor 13 reaches a predetermined value, the control unit 12 causes the imaging unit 11 to display an imaging instruction on the display unit 14 (step 55). The discriminator 17 who has seen the display unit 14 presses the shutter (step 56). In response to this, the control unit 12 causes the imaging unit 11 to capture an image and records the second image in the storage unit 21 (step 57).

  3 and 4, when the imaging condition is satisfied, the control unit 12 displays an imaging instruction on the display unit 14, the discriminator 2 releases the shutter, receives the judgment of the discriminator 2, and the control unit 12 captures the image. However, the control unit 12 may directly determine that the shutter should be released, and the image pickup unit 11 may pick up the image.

  As shown in FIG. 3, the first image and the second image recorded in the storage unit 21 are displayed side by side on the display unit 14 (step 58), and the discriminator 59 displays the first image and the second image displayed side by side. These images are compared to determine whether the images have changed or the colors have changed (step 59). Although it is necessary to compare at least the first image and the second image, the angle may be further changed, and three or more images may be acquired and compared.

Also, steps 71 to 97 in FIG. 4 are performed in steps 31 to 56 in FIG.
It is the same. The first image and the second image recorded in the storage unit 21 are preferably displayed side by side, but they are not necessarily displayed (step 98). From the first image and the second image, output signals 1 and 2 of the verification unit 301 of the forgery prevention medium 3 are obtained and recorded (step 99). The color difference may be calculated by the calculation unit 22 of the control unit 12 from the two output signals. It is verified whether the hue has changed from these two output signals (step 100). If it has changed, OK is displayed on the display unit 14 (step 101), and there is no change or vagueness. Then, NG is displayed on the display unit 14 (step 102).

  To change the hue, it is only necessary to obtain RGB signals from the image and read the color difference from RGB or to know that the hue has changed. For example, it is also possible to simply determine the hue from the size of RGB and to use RGB showing the largest value as the hue. The color difference may be calculated in terms of RGB.

  Next, the present invention will be described more specifically with reference to examples.

<Example 1>
Hold the portable information terminal of the present invention containing the identification program over an anti-counterfeit medium provided with a diffraction grating whose image changes depending on the angle, and follow the instructions to reduce the angle θ between the normal line of the identification device and the identification medium. A first image was acquired at 90 °. Next, according to the instruction of the display unit, the discriminator changed the angle, set θ to about 45 °, and acquired the second image. A first image and a second image were acquired on the display unit. The first image and the second image were displayed side by side on the display unit.

<Comparative Example 1>
Instead of the anti-counterfeit medium of Example 1, the printed image was the same as the image viewed from the front, and the other images were acquired under the same conditions, and the images were displayed side by side.

  The first image and the second image output in Example 1 can be identified as different images being displayed, and it is easy to identify that the target anti-counterfeit medium is a genuine product. However, in Comparative Example 1, the same image of the same color was displayed side by side in the first image and the second image of the printed material, and it was easy to identify that the printed material had no optical change.

<Example 2>
Printed with the ink composition 1 containing a pearl pigment coated with a metal oxide on mica, and holding the portable information terminal of the present invention containing the identification program over the verification portion of the anti-counterfeit medium whose color changes depending on the angle, According to the instruction, the first image was obtained with the angle θ formed by the normal line of the identification device and the identification medium being about 90 °. Next, according to the instruction of the display unit, the discriminator changed the angle, set θ to about 45 °, and acquired the second image. A first image and a second image were acquired on the display unit. Output signals of the first image and the second image were acquired and shown in Table 1.
[Ink composition 1]
Colorstream T10-03 (Merck) 10% by weight
SS8 WAC varnish (Toyo Ink Co., Ltd.) 90% by weight

<Comparative example 2>
Instead of the anti-counterfeit medium of Example 2, the following normal printed matter printed with the following ink composition 2 was changed, and the output signals of the first image and the second image were changed under the same conditions. The output results are shown in Table 1.
[Printed matter]
PANTONE 377U
[Ink composition 2]
PANTONE Yellow 70.60 parts by weight PANTONE Green 23.50 parts by weight PANTONE Black 5.90 parts by weight

  From the results shown in Table 1, since the color determination of RGB in Example 2 was different between the first image and the second image, it was determined that a hue change due to an angle occurred, and the result was OK. On the other hand, in Comparative Example 2, the same color determination was obtained, and it was determined that there was no hue change due to the angle, and NG was displayed. The same hue was confirmed by visual judgment, and judgment at a predetermined angle can be easily performed.

DESCRIPTION OF SYMBOLS 1 ... IDENTIFICATION APPARATUS 2 ... IDENTIFIER 3 ... FORTAGE PREVENTION MEDIUM 11 ... IMAGING UNIT 12 ... CONTROL UNIT 13 ... ANGLE SENSOR 14 ... DISPLAY 15 ... Illumination unit 21 ... storage unit 22 ... calculation unit 23 ... imaging element 24 ... exposure control unit 25 ... shutter speed control unit 26 ... aperture value control units S31 to S59, S71 to S102 ... Number of steps 301 in the flowchart ... Verification unit 302 ... An angle θ of the imaging condition of the first image
303: Angle θ of the imaging condition of the second image

Claims (8)

A method that a smartphone executes in order to make it easier to identify anti-counterfeit media that undergo optical changes depending on the angle,
As the smartphone, and the image pickup unit for acquiring an image, a first step of generating a capturing instruction when using the smart phone and a angle sensor for measuring the angle of the imaging unit, the imaging unit satisfies a pickup condition, A second step of generating an imaging instruction when the imaging unit satisfies imaging conditions different in angle from the first step, and displaying at least two or more captured images side-by-side for easy human discrimination An identification method comprising the steps of: A method executed by a smartphone to make it easier to identify anti-counterfeit media whose color changes with angle,
As the smartphone, an imaging unit for acquiring an image, a first step of generating a capturing instruction when using the smart phone and a angle sensor for measuring the angle of the imaging unit, the imaging unit satisfies a pickup condition, A second step of generating an imaging instruction when the imaging unit satisfies imaging conditions different in angle from the first step, and a hue change due to an angle from an output signal of a predetermined portion of the two captured images. And a step of determining authenticity based on whether or not it is awake and displaying a determination result.   The said imaging part is provided with illumination in the imaging part vicinity, and includes the step which irradiates with respect to a target object from the same direction as an imaging side according to an imaging instruction | indication. Identification method. The angle of the imaging condition is 70 ° ≦ θ ≦ 110 ° when the angle formed by the normal line of the smartphone and the forgery prevention medium is θ, and the angle of the angle sensor of the imaging condition of the first step is 70 ° ≦ θ ≦ 110 °, 4. The identification method according to claim 1, wherein an angle of the angle sensor in the imaging condition of the second step is 20 ° ≦ θ ≦ 60 °. A smart phone for help determine the medium for preventing forgery optical change occurs depending on the angle, as the smart phone, an imaging unit that acquires an image, a smartphone and a angle sensor for measuring the angle of the imaging unit used, A first step of generating an imaging instruction when the imaging unit satisfies an imaging condition, and a second step of generating an imaging instruction when the imaging unit satisfies an imaging condition having a different angle from the first step; , smartphones, characterized in that human at least two or more points of an image captured to perform the step of displaying side by side for ease of discrimination. A smart phone for help determine the medium for preventing forgery color is changed by an angle, as the smart phone, an imaging unit that acquires an image, a smartphone and a angle sensor for measuring the angle of the imaging unit used, A first step of generating an imaging instruction when the imaging unit satisfies an imaging condition, and a second step of generating an imaging instruction when the imaging unit satisfies an imaging condition having a different angle from the first step; A smart phone that executes a step of determining authenticity based on whether or not a change in hue due to an angle has occurred from an output signal of a predetermined portion of two captured images, and displaying a determination result. 7. The imaging unit according to claim 5, wherein the imaging unit is provided with illumination in the vicinity of the imaging unit, and the step of irradiating the object from the same direction as the imaging side is performed in response to the imaging instruction. The listed smartphone . The angle of the imaging condition is 70 ° ≦ θ ≦ 110 ° when the angle formed by the normal line of the smartphone and the forgery prevention medium is θ, and the angle of the angle sensor of the imaging condition of the first step is 70 ° ≦ θ ≦ 110 °, The smartphone according to any one of claims 5 to 7, wherein the angle of the angle sensor of the imaging condition of the second step is 20 ° ≤ θ ≤ 60 °.

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