JP2002312772A - Individual identification device and eye forgery judgment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent individual impersonation by a forged eye. SOLUTION: The eye of a person to be image picked-up and its periphery are irradiated with light by an illumination means 1 and images of them are picked up by a camera 2. An eye part extraction part 5 extracts a pupil area, an iris area and a sclera area from the obtained eye image and a density extraction part 6 extracts the densities of the respective areas. A judgment part 7 compares the densities of the respective areas with an upper limit density reference value and a lower limit density reference value in a density reference value memory 8 and judges whether or not the eye whose image is picked up is forged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal identification device for identifying an individual in a financial institution or the like, and more particularly, to a personal identification device capable of determining whether or not an eye to be imaged is forged. Related to the determination method.

[0002]

2. Description of the Related Art A personal identification device captures an image of an eye of a person to be imaged, such as a customer of a financial institution, and the periphery thereof with a camera, and generates, for example, iris data of the eye from the obtained eye image. A configuration is provided in which the data is compared with registered iris data registered in advance to identify whether or not the person to be imaged is the subject.

[0003]

By the way, in the conventional personal identification device, a third party wears a prosthetic eye as an eye or stands in front of a camera using a photograph of the person's eyes.
In the case of impersonating, there is a risk that these counterfeits may be overlooked.

[0004]

The present invention has the following arrangement in order to solve such a problem. That is, the present invention
Imaging means for capturing an eye image of an eye of a subject, a density extraction unit for extracting the density of at least one or more specific regions of the captured eye image, forged eyes and previously obtained human eyes The density reference value storage unit storing the density reference values created based on the respective densities of the corresponding specific regions of the respective images is compared with the extracted density and the density reference value in the density reference value storage unit. A determination unit that determines whether the eye is a falsified eye.

According to another aspect of the present invention, an image pickup means for picking up an eye image of an eye of a person to be imaged, a density extracting unit for extracting respective densities of a plurality of specific regions of the picked-up eye image, and a forgery. A density storing a density difference reference value created based on a density difference between a plurality of corresponding specific regions of the eye image and a density difference of the corresponding plurality of specific regions of the human eye image obtained in advance. A difference reference value storage unit, a density difference extraction unit that extracts a difference in density between the extracted plurality of specific regions, and a comparison between the extracted density difference and a density difference reference value of the density difference reference value storage unit. A determination unit that determines whether the eye is a forged eye.

According to another aspect of the present invention, there is provided an image pickup means for picking up an eye image of an eye of a person to be imaged, a density extracting section for extracting respective densities of a plurality of specific regions of the picked-up eye image, and a forged eye. A density ratio reference stored with a density ratio reference value created based on the density ratios of the corresponding specific regions of the image and the density ratios of the corresponding specific regions of the human eye image obtained in advance. A value storage unit, a density ratio extraction unit that extracts the ratio of the densities of the plurality of extracted specific regions, and a forgery that compares the extracted density ratio with the density ratio reference value of the density ratio reference value storage unit. And a determining unit for determining whether or not the eye is irritated.

According to another aspect of the present invention, there is provided an image pickup means for picking up an eye image of a subject's eye, an area extracting unit for extracting at least one or more specific areas of the picked-up eye image, A density differential reference value storage unit that stores a density differential reference value created based on a density differential value obtained by differentiating each density of a corresponding specific region of each image of the human eye, A density differential extraction unit for differentiating the density of the specific region, and a determination unit for comparing the extracted density differential value with the density differential value of the density differential reference value storage unit to determine whether the eye is forged. , Is included.

According to another aspect of the present invention, there is provided an image pickup means for picking up an eye image of a subject's eye, an area extracting unit for extracting a plurality of specific areas of the picked-up eye image, and correspondence of a forged eye image. The difference between the density differential value obtained by differentiating each density of a plurality of specific areas and the density differential value obtained by differentiating each density of a plurality of specific areas corresponding to a previously obtained human eye image And a density differential difference reference value storage unit that stores density differential difference reference values created based on the density differential difference extracting a density differential value difference by differentiating each density of the extracted plurality of specific regions. An extraction unit, and a determination unit that determines whether the eye is a forged eye by comparing the extracted density differential value difference with the density differential difference reference value of the density differential difference reference value storage unit. And

According to another aspect of the present invention, there is provided an image pickup means for picking up an eye image of a subject's eye, an area extracting unit for extracting a plurality of specific areas of the picked-up eye image, and a correspondence between a forged eye image. The ratio of the density differential value obtained by differentiating each density of a plurality of specific areas to the density differential value obtained by differentiating each density of a plurality of specific areas corresponding to a previously obtained human eye image And a density differential ratio reference value storage unit that stores a density differential ratio reference value created based on the above, and a density differential ratio that extracts a density differential value ratio by differentiating each density of the extracted plurality of specific regions. An extracting unit, and a determining unit for comparing the extracted density differential value ratio with the density differential ratio reference value of the density differential ratio reference value storage unit to determine whether the eye is a forged eye. And

According to another aspect of the present invention, there is provided an image pickup means for picking up an eye image of an eye of a person to be imaged, an area extracting section for extracting at least one or more specific areas of the picked-up eye image, A spatial frequency reference value storage unit that stores a spatial frequency reference value created based on a spatial frequency value obtained by spatial frequency conversion of each density of a corresponding specific region of each image of the human eye that has been obtained; And an extraction unit that converts the density of the extracted specific region into a spatial frequency to extract a spatial frequency value, and compares the extracted spatial frequency value with the spatial frequency value of the spatial frequency reference value storage unit and is forged. A determination unit for determining whether the eye is the eye or not.

In each of the above inventions, the forged eye may be any of a prosthetic eye, an eye on a photograph, or an eye on a printed matter, and the obtained eye image may include a peripheral portion of the eye as a specific region. preferable. Further, the eyes may be determined by combining the respective inventions with each other. Further, a plurality of illuminating means for irradiating light having different wavelengths is provided, and an eye image is acquired each time light is illuminated by each illuminating means. May be determined.

Also, since the human eye has a curved surface structure, each of the eyes is illuminated by a pair of illuminating means arranged opposite to each other so as to produce shadows in the eye and its surroundings, and each eye is obtained by the imaging means. By comparing each density region of the image, for example, if the density is different in the symmetric region of each eye image, it is determined that the eye is the person's eye, and if the densities are almost the same, it may be determined that the eye is a forged eye on a photograph. . This determination method is used in combination with the above inventions.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. <Embodiment 1> FIG. 1 is a block diagram of a personal identification device according to Embodiment 1 of the present invention. This personal identification device includes an illuminating unit 1 for irradiating light to the face of a person to be imaged, a camera 2 for imaging a face centered on the eye of the person to be imaged, and the illuminating unit 1 and the camera 2 are connected. The control unit 3, the memory 4 and the eye part extraction unit 5 connected to the control unit 3, the density extraction unit 6 connected to the eye part extraction unit 5, and the density extraction unit 6 connected to the density extraction unit 6. A determination unit 7 and a density reference value memory 8 connected to the determination unit 7. The output side of the memory 4 is connected to a collating unit 9, and the control unit 3 is further connected to a registration database 10. The illumination unit 1 operates under the control of the control unit 3 and emits near-infrared light. The camera 2 outputs an eye image (data) including eyes of the face by the control unit 3
Output to The control unit 3 stores the eye image in the memory 4 and activates the eye part extracting unit 5.

By the way, the human eye, as shown in FIG.
It has a pupil 20, an iris 21, and a sclera 22 (so-called white eye). The eye part extracting unit 5 fetches an eye image from the memory 4, detects a density change of the eye image, and
A, outlines of the iris region 21A and the sclera region 22A (see FIG. 2) are set, and the region of each part is extracted. The density extraction unit 6 extracts each of the pupil region 20A, the iris region 21A, and the scleral region 22A.

The density reference value memory 8 stores a reference value L1 indicating the density upper limit of the human eye and a reference value L2 indicating the density lower limit for each region (see FIG. 3). That is, the artificial eye
It is usually made from silicon and when irradiated with near-infrared light,
Due to its unique infrared reflectance and absorptivity, the pupil region, iris region and scleral region have different densities from the human eye on the eye image, while the eyes on a photograph or the eyes on printed matter When irradiating near-infrared light, the reflectance of the pupil region, the iris region, and the scleral region on the eye image differs similarly from that of the human eye because the reflectance differs depending on the medium such as a photograph or the ink or the like. I have.

In this example, eye images are obtained from a large number of artificial eyes, eyes on photographs or printed matter (forged eyes) and eyes of a plurality of persons, and a density range for each area is obtained. And threshold values of the human eye are set, and these threshold values are set as the above-described density reference values L1 and L2 of the human eye. The determination unit 7 determines the density value of each area extracted by the density extraction unit 6 and the density reference values L1 and L.
2 to determine whether the eye on the eye image is a fake eye. The iris data of the person is registered in the registration database 10. The collation unit 9 extracts iris data from the captured eye image, collates the iris data with the registered iris data acquired from the registration database 10 via the control unit 3, and determines whether or not the user is the principal.

Next, the operation of the personal identification device of the present invention will be described. When the illuminating means 1 irradiates a subject with a prosthetic eye or a photograph or the like with light, the camera 2 images a part of the face including the eyes and outputs an eye image. The control unit 3 stores the eye image in the memory 4 and activates the eye part extracting unit 5. The eye part extraction unit 5 includes a pupil region 20A, an iris region 21
A, since the scleral region 22A is extracted, the concentration extracting unit 6 extracts the concentration of each of these regions.

The determination unit 7 determines a density value for each area and a density reference value L1 corresponding to each area fetched from the density reference value memory 8.
And the density reference value L2. The density value for each region is larger than the reference value L1 or smaller than the reference value L2 because the density value is an eye such as an artificial eye or a photograph. Therefore,
The determination unit 7 determines that the eye is a counterfeit eye, and notifies the control unit 3 of the determination. Upon receiving this notification, the control unit 3 stops the registration process in the registration database 10 at the time of data registration, cancels the collation result or does not start the collation operation at the time of collation by the collation unit 9, Notify that you are a third party impersonating you.

In this specific example, when all three regions are larger than the reference value L1 or smaller than the reference value L2, it is determined that the eye is forged. However, when any one region is larger or smaller than the reference value. However, it may be determined that the eye is forged. Alternatively, only the iris region may be determined.

<Embodiment 2> FIG. 4 is a block diagram of a personal identification device according to Embodiment 2 of the present invention. This personal identification device further includes an eye periphery part extraction unit 11. By the way, as shown in FIG. 5, the human eye has a pupil 20, an iris 21, and a sclera 2.
2, the eyelashes 23, the upper eyelids 24, the eyelashes 25, and the lower eyelids 26 are present in the vicinity thereof.
The eye periphery part extracting unit 11 fetches an eye image from the memory 4, detects a change in the density of the eye image, and detects
A, the outlines of the upper eyelid region 24A, the eyelash region 25A, and the lower eyelid region 26A are set, thereby extracting each peripheral region.

Further, similarly to the first embodiment, the eye part extracting section 5A includes a pupil region 20A, an iris region 21A, and a scleral region 2A.
2A is extracted, and a central region 27A corresponding to the central portion 27 of the pupil 20 is further extracted. In the human eye, the central portion 27 is bright because the irradiation light is directly reflected by the cornea on the surface of the eyeball, so that the density of the central region 27A obtained corresponding to the central portion 27 in the eye image is the highest (brightest). Become).

In the density reference value memory 8A, in addition to the density reference value L1 and the density reference value L2, density reference values of the peripheral portion such as the eyebrows 23 and the central portion 27 are stored. That is, each peripheral part such as the eyebrows 23 of a person has a density value peculiar to a tissue cell of a living body, while the peripheral part of the eye on a photograph or printed matter is usually reflected by a medium, ink, or the like. Since the ratios are different, the density values are different. Therefore,
In this specific example, eye images are obtained from many people and photographs,
A density value range for each peripheral area is obtained, and a reference value including a threshold value for each peripheral area is set. Further, since the reflection from the central part 27 is much smaller than that of the human eye, the density value is small for eyes on photographs and printed matter. Therefore, the reference value of the central region is set similarly. In FIG. 4, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

Next, the operation of the personal identification device of the embodiment 2 will be described. When an eye image obtained by imaging the forged eye and its surroundings with the camera 2 is stored in the memory 4, the control unit 3 operates the eye part extracting unit 5A and the eye peripheral part extracting unit 11. The eye part extraction unit 5A includes a pupil region 20A, an iris region 2
Since 1A, the scleral region 22A, and the central region 27A are extracted, the concentration extracting unit 6 extracts the concentration of each of these regions. On the other hand, the eye-periphery-part extracting unit 11 performs the eyelash region 23A, the upper eyelid region 24A, the eyelash region 25A, and the lower eyelid region 2
Since 6A is extracted, the density extracting unit 6 similarly extracts the density of each peripheral region.

The determination unit 7A compares the density value of each area 20A with the density reference value L1 and the density reference value L2, and thereby determines that the eye is forged. The determination unit 7A
Compares the central region 27A and each peripheral region with each set reference value, and similarly determines that the eye is forged.
Therefore, according to the present specific example 2, since it is determined whether or not the eye is forged including the peripheral part other than the eye, the determination accuracy is improved.

<Embodiment 3> FIG. 6 is a block diagram of a personal identification device according to Embodiment 3 of the present invention. This personal identification device further includes a density difference extracting unit 12 in the configuration of the specific example 1. by the way,
The brightness at the time of imaging by the camera 2 is affected by the surrounding environment and the intensity and change of the irradiation light of the illumination unit 1. Also,
The brightness of the eye and its surroundings differs depending on the imaging distance of the subject to the camera 2. For this reason, the density of the entire eye image acquired by the camera 2 may be affected by the surrounding environment or the like, and may change every imaging.

The density difference extracting unit 12 receives the density values of the pupil region 20A, the iris region 21A and the scleral region 22A (see FIG. 2) from the density extracting unit 6, and outputs the density between the regions. The difference between the values is calculated to extract each density difference. On the other hand, each density difference reference value is stored in the density difference reference value memory 8B. That is, eye images are obtained from a large number of forged eyes and human eyes, an average density value is obtained for each area, and a density difference between each area is obtained. These threshold values are set on the basis of the density difference between them, and these threshold values are used as the respective density difference reference values. In FIG. 6, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Next, the operation of the personal identification device of the third embodiment will be described. When an eye image obtained by imaging the forged eye and its surroundings by the camera 2 is stored in the memory 4 and each part of the eye is extracted, the density extraction unit is controlled by the control unit 3 to control the pupil region 20.
A, density values of the iris region 21A and the scleral region 22A (see FIG. 2) are extracted. Next, the density difference extracting unit 12 calculates and extracts the density difference between these areas 20A, 21A, 22A. The determination unit 7B compares the obtained respective density differences with the respective density difference reference values in the density difference reference value memory 8B, thereby determining that the eye is a forged eye.

As described above, when the density difference of each area is used as a criterion, even if the density of the eye image obtained due to the influence of the surrounding environment at the time of imaging varies, whether or not the eye is accurately forged is determined. Can be determined. The invention of Embodiment 3 may be combined with the invention of Embodiment 1 and the invention of Embodiment 2.
This enables highly accurate determination.

<Embodiment 4> FIG. 7 is a block diagram of a personal identification apparatus according to Embodiment 4 of the present invention. This personal identification device further includes a density ratio extracting unit 13 instead of the density difference extracting unit 12 of the third embodiment. When each density value of the pupil region 20A, the iris region 21A and the sclera region 22A (see FIG. 2) is sent from the density extraction unit 6, the density ratio extraction unit 13 calculates the density ratio between the regions. To extract each concentration ratio.

In the density ratio reference value memory 8C, threshold values set based on the density ratio between the area of the forged eye and the human eye, that is, each density ratio reference value, as in the third embodiment, are stored. ing. Also in this specific example, since the density ratio of each area is used as a criterion, even if the density of the eye image obtained due to the influence of the surrounding environment at the time of imaging varies, whether or not the eye is accurately forged is determined. Can be determined.

By the way, for example, the density difference between the pupil region 20A and the sclera region 22A is very large and is substantially determined by the density of the sclera region 22A.
According to the invention, the density difference between the areas of the forged eye and the human eye may be close to each other, which may make it difficult to set the density difference reference value. On the other hand, in the invention of the fourth embodiment, for example, the density ratio of the pupil region 20A having a high density is used as the denominator and the density of the sclera region 22A is used as the numerator. Can be clearly expressed as a concentration ratio reference value. The invention of the embodiment 4 may be combined with the invention of the embodiment 1, the invention of the embodiment 2 and the invention of the embodiment 3, thereby enabling highly accurate determination.

<Embodiment 5> FIG. 8 is a block diagram of a personal identification device according to Embodiment 5 of the present invention. This personal identification device includes a density differential extraction unit 14 instead of the density extraction unit 6 of the first embodiment. By the way, the iris 21 shown in FIG. 2 has a concavo-convex pattern (iris pattern) composed of muscle folds inside. On the other hand, the pupil 20 has no physical unevenness. Therefore, since the density of the iris 21 changes, a large differential value is obtained by differentiating the density (irregularity) of the iris area 21A on the eye image. Therefore, when the iris area 21A is sent from the eye part extracting section 5, the density differential extraction section 14 differentiates the density change of the area 21A to extract a density differential value.

On the other hand, the density differential reference value memory 8D stores a density differential reference value. That is, it is difficult to provide an iris pattern on the iris of the artificial eye as in the case of the human eye, and the iris of the eye does not appear clearly on photographs or printed matter. Therefore, in this specific example, the density differential range of the iris region is obtained from a large number of forged eye images, and the density differential range of the iris region is obtained from a large number of human eye images. An eye threshold is set, and this is used as a density differential reference value. In FIG. 8, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Next, the operation of the personal identification device of the embodiment 5 will be described. An eye image obtained by imaging the forged eye and its surroundings with the camera 2 is stored in the memory 4, and an eye part extracting unit 5
Extracts the iris area 21A, under the control of the control unit 3, the density differential extraction unit 14 differentiates the density change of the iris area 21A to extract a density differential value.

Next, the determination unit 7D compares the obtained density differential value with the density differential reference value in the density differential reference value memory 8D, and thereby determines that the eye is forged. By the way, the iris 21 of the human eye shows not only a change in density but also a complicated change in density. Therefore, in the specific example 5, a higher-order differential value obtained by performing higher-order differentiation on the density change of the iris region 21A may be extracted as a density differential value. That is, a density differential value indicating a complicated density change of the iris is obtained, so that a more accurate determination can be made. Specific Example 5
May be combined with the above-described invention of the first embodiment, the invention of the second embodiment, the invention of the third embodiment, and the invention of the fourth embodiment,
This enables highly accurate determination.

<Embodiment 6> FIG. 9 is a block diagram of a personal identification device according to Embodiment 6 of the present invention. This personal identification device further includes a density differential difference extraction unit 15 in the configuration of the specific example 5. The density differential difference extracting unit 15 receives the pupil region 20A, iris region 21A, and scleral region 22A from the density differential extracting unit 14A (FIG. 2).
When each density differential value is sent, the difference between the density differential values between the regions is calculated to extract each density differential value difference.

On the other hand, the density differential difference reference value memory 8E stores
Each density differential difference reference value is stored. These density differential difference reference values are set as threshold values in the same manner as in the specific example 3 described above based on eye images obtained from a large number of forged eyes and a large number of human eyes. In this personal identification device, when an eye image obtained by imaging the forged eye and its surroundings with the camera 2 is stored in the memory 4, the eye part extraction unit 5 extracts the pupil region 20A and the iris region from the eye image. 21A and scleral region 2
Extract 2A.

Next, the density differential extraction section 14A calculates and extracts the density differential values of these areas 20A, 21A, 22A. Next, the density differential difference extraction unit 15 calculates and extracts the difference in density differential value between the obtained regions. The determination unit 7E
The obtained density differential differences are stored in a density differential difference reference value memory 8E.
Is compared with each reference value of the density differential difference, thereby determining that the eye is forged. In this specific example 6, since the density differential difference of each area is used as a criterion, even if the density of the eye image obtained due to the influence of the surrounding environment at the time of imaging fluctuates, forgery is accurately performed. It can be determined whether or not the eye is involved.

The invention of the embodiment 6 may be combined with the invention of the embodiment 1, the invention of the embodiment 2, the invention of the embodiment 3, and the invention of the embodiment 5. The accuracy can be determined. In FIG. 9 showing this specific example 6, a density differential ratio extracting unit may be provided instead of the density differential difference extracting unit 15. That is, each area 20A, 21A, 22A
May be determined by the determination unit. Thereby, the operation in the above specific example 4,
The effect is obtained. It is needless to say that a higher-order differential value obtained by higher-order differentiation of the density of each region may be used as a density differential value.

<Embodiment 7> FIG. 10 is a block diagram of a personal identification device of Embodiment 7 of the present invention. This personal identification device includes a spatial frequency extracting unit 16 instead of the density differential extracting unit 14 of FIG. By the way, as mentioned above,
The iris 21 has an uneven pattern formed of muscle folds inside. In this specific example, attention is paid to expressing a change in density (irregularity) of the iris region 21A on the eye image as a planar sparse and dense pitch. That is, the spatial frequency extracting unit 16 converts the density change of the iris area 21A into a spatial frequency and extracts the frequency value.

On the other hand, the spatial frequency reference value memory 8F stores
A spatial frequency reference value is stored. This spatial frequency reference value is based on the spatial frequency value of the iris region obtained from the forged eye image and the spatial frequency value of the iris region obtained from the human eye image, as in the specific example 5 described above. It is set as a threshold. In FIG. 10, the same parts as those in FIG. 8 are denoted by the same reference numerals, and the description thereof will be omitted.

In this personal identification device, an eye image obtained by imaging the forged eye and its surroundings with the camera 2 is stored in the memory 4, and when the eye part extracting unit 5 extracts the iris area 21A, Under the control of the unit 3, the spatial frequency extracting unit 16
The density change of the iris area 21A is converted into a spatial frequency, and the frequency value is extracted. The determination unit 7F compares the obtained spatial frequency value with the spatial frequency value of the memory 8F, and thereby determines that the eye is forged.

According to this specific example 7, even if the iris area 21A is unclear on the eye image, the irregular pattern can be accurately represented as a spatial frequency. It becomes possible to determine. The invention of the embodiment 7 may be combined with the inventions of all the above-mentioned embodiments.

<Embodiment 8> FIG. 11 is a block diagram of a personal identification device of Embodiment 8 of the present invention. This personal identification device further includes a spatial frequency difference extracting unit 17 in the configuration of the specific example 7. In this personal identification device, when an eye image obtained by imaging the forged eye and its surroundings with a camera is stored in the memory 4, the eye part extracting unit 5 extracts the pupil region 20A and the iris region from the eye image. 21A and the scleral region 22A are extracted.

The spatial frequency extracting unit 16A calculates these regions 2
The density changes of 0A, 21A and 22A are converted into spatial frequencies and extracted. The spatial frequency difference extracting unit 17 calculates and extracts a difference between spatial frequency values between the obtained regions. Judgment unit 7G
Compares each obtained spatial frequency value difference with each spatial frequency difference reference value in the spatial frequency difference reference value memory 8G, thereby determining that the eye is a forged eye. Note that the spatial frequency difference reference value is set as a threshold value based on the average spatial frequency difference for each region, as described above.

According to the eighth embodiment, even if the density of the eye image varies due to the influence of the surrounding environment or the like, the authenticity of the eye can be accurately determined. The invention of this specific example 8 can be used in combination with the inventions of all the specific examples described above. 11, a spatial frequency ratio extracting unit may be provided instead of the spatial frequency difference extracting unit 17 in FIG.
That is, the ratio of the spatial frequency of each of the regions 20A, 21A, and 22A may be obtained, and the determination unit may make the determination. Thereby, the operation and effect of the fourth embodiment can be obtained.

<Embodiment 9> FIG. 12 is a block diagram of a personal identification device according to Embodiment 9 of the present invention. This personal identification device includes a plurality of lighting units 1A, 1B, 1C and a lighting switching unit 18, and the other configuration is the same as that of the first embodiment in FIG. These illuminating means 1A, 1B, 1C irradiate light of different wavelengths, for example, illuminating means 1A irradiates visible light,
The illumination unit 1B emits near-infrared light, and the illumination unit 1C emits near-infrared light having different wavelengths.

By the way, when the iris of the artificial eye and that of the human are irradiated with visible light, there is not much difference in the density of the obtained iris region. On the other hand, when irradiated with near-infrared light, the brightness becomes unique for each wavelength, and each has a unique small density. The control unit 3 controls the switching of the illumination switching unit 18 to activate the illumination units 1A, 1B, and 1C in this order, and causes the camera 2 to image the eye of the subject every time the camera 2 is irradiated with light.

The density reference value memory 8 stores a density reference value L1 and a density reference value L2 (see FIG. 3) for each wavelength of each illumination means. The determination unit 7 determines whether each of the lighting units 1A,
Area density for each eye image corresponding to 1B and 1C, and memory 8
Are compared with the corresponding reference values L1 and L2. Therefore, according to the ninth embodiment, since the authenticity of the eye is determined based on a plurality of eye images different for each wavelength, the accuracy of the determination is greatly improved. The invention of the ninth embodiment can be combined with the inventions of all the above-described embodiments.

<Embodiment 10> FIG. 13 is an explanatory diagram of an eye forgery determination method according to Embodiment 10. In the figure, reference numeral 30 denotes an eye of a subject. Lighting means 31 and 32 are symmetrically arranged on both sides of the eye 30 as a center. By the way, the human eye has a curved surface structure. Therefore, when the illuminating means 31 emits light from the side of the eye, most of the illuminating light A is reflected toward the camera 33 by the curved surface of the eye, but a part of the illuminating light B is separated from the camera 33 by the curved surface of the eye. Reflected in the direction. For this reason, a shadow is generated in a substantially half part of the eye.

When an image of the eye 30 and its surroundings is taken by the camera 33 in such an irradiation state, as shown in FIG.
On the eye image, a substantially half area 34A is bright, and the remaining half area 34B is dark. That is, the density of the remaining substantially half area 34B is lower than the density of the area 34A. On the other hand, when light is irradiated by the other illumination means 32, the density of the substantially half area 34A on the obtained eye image decreases, and the density of the remaining area 34B increases.

In the method of the present invention, each time the illumination means 31 and 32 are illuminated, the camera 33 captures an image of the eye 30 and its surroundings, and the obtained binocular image has an eye part such as an iris area of each area 34A and 34B. The densities of the half regions are compared, and if the densities of the both eye region regions are inverted, it is determined that the subject is the eye (or the prosthesis) of the subject. On the other hand, if the eye on a photograph or printed matter is imaged as described above, since the image is a two-dimensional image, there is no difference in density between the half regions 34A and 34B of each eye image. Can be determined.

FIG. 15 is a block diagram of a personal identification device for implementing the method of the present invention. This personal identification device
The configuration of the specific example 1 shown in FIG. 1 further includes an illumination switching unit 18 and a shade density extraction unit 19. The illumination switching unit 18 switches and activates the illumination units 31 and 32 under the control of the control unit 3. The camera 33 captures an image each time each of the lighting means 31 and 32 operates, and outputs each eye image.

The eye part extracting section 5 performs the pupil region 2 for each eye image.
0A, the iris region 21A and the scleral region 22A are extracted.
The density extraction unit 6 determines whether each of the regions 20A and 21 of the one eye image
Extract the concentrations of A and 22A. The determination unit 7H determines each area 2
0A, 21A, and 22A are compared with the density reference values L1 and L2 of the density reference value memory 8 to determine whether the eye is a forged eye.

On the other hand, the shade density extracting section 19 divides the areas 20A, 21A and 22A into half areas for each eye image, and extracts the density for each divided area. The determination unit 7H collates whether or not the density is inverted in each divided region, determines that the image is the eye 30 or the artificial eye of the subject if the image is inverted, and matches the eye on the photograph or printed matter if the image is not inverted. judge.

In the method of the present invention, one eye image may be acquired, and the overall densities of the regions 34A and 34B of the eye image may be compared to determine whether the eye is a fake photo. . The method of the present invention can be combined with the above-described other specific examples.

[Brief description of the drawings]

FIG. 1 is a block diagram of a personal identification device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram conceptually showing an eye structure.

FIG. 3 is a diagram showing a density reference value level of the present invention.

FIG. 4 is a block diagram of a personal identification device of a specific example 2.

FIG. 5 is a diagram conceptually showing an eye and its periphery.

FIG. 6 is a block diagram of a personal identification device according to a third embodiment.

FIG. 7 is a block diagram of a personal identification device of a specific example 4.

FIG. 8 is a block diagram of a personal identification device of a specific example 5.

FIG. 9 is a block diagram of a personal identification device of a specific example 6.

FIG. 10 is a block diagram of a personal identification device of a specific example 7.

FIG. 11 is a block diagram of a personal identification device of a specific example 8;

FIG. 12 is a block diagram of a personal identification device according to a ninth embodiment.

FIG. 13 is an explanatory diagram of the eye forgery determination method of the present invention.

FIG. 14 is a diagram showing an eye image obtained by the method of the present invention.

FIG. 15 is a block diagram of a personal identification device for implementing the method of the present invention.

[Explanation of symbols]

 1, 1A, 1B, 1C Illumination means 2 Camera 3 Control unit 4 Memory 5, 5A Eye part extraction unit 6 Density extraction unit 7, 7A to 7H Judgment unit 8, 8A Density reference value memory 8B Density difference reference value memory 8C Density Ratio reference value memory 8D Density derivative reference value memory 8E Density derivative difference reference value memory 8F Spatial frequency reference value memory 8G Spatial frequency difference reference value memory 9 Collation unit 10 Registration database 11 Eye peripheral part extraction unit 12 Density difference extraction unit 13 Concentration ratio Extraction unit 14, 14A Density differential extraction unit 15 Density differential difference extraction unit 16, 16A Spatial frequency extraction unit 17 Spatial frequency difference extraction unit 18 Illumination switching unit 19 Shadow density extraction unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4C038 VA07 VB04 VC01 VC05 5B047 AA23 AB02 BB06 CB09 DC09 5L096 AA06 BA18 CA02 DA02 EA35 FA39 GA51 JA00

Claims (41)

[Claims] An imaging unit configured to capture an eye image of an eye of a person to be imaged; a density extraction unit configured to extract a density of at least one or more specific regions of the captured eye image; A density reference value storage unit that stores a density reference value created based on each density of the specific region corresponding to each obtained human eye image; and the extracted density and the density reference value storage. A determination unit that determines whether the eye is a forged eye by comparing the density reference value of the unit with the density reference value. 2. The personal identification device according to claim 1, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 3. The personal identification device according to claim 1, wherein the eye image includes a peripheral portion of the eye, and the peripheral portion is also the specific region. An imaging unit configured to capture an eye image of an eye of a subject; a density extraction unit configured to extract respective densities of a plurality of specific regions of the captured eye image; A density difference criterion in which a density difference reference value created based on a density difference of the corresponding plurality of specific regions and a density difference of the corresponding plurality of specific regions of the image of the human eye obtained in advance is stored. A value storage unit; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; and a comparison between the extracted density difference and the density difference reference value in the density difference reference value storage unit. And a determining unit for determining whether the eye is a falsified eye. 5. The personal identification device according to claim 4, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 6. The personal identification apparatus according to claim 4, wherein the eye image includes a peripheral part of the eye, and the peripheral part is the specific area. 7. A density reference value storage unit storing a density reference value created based on each density of a corresponding specific region of each image of a forged eye and a previously obtained human eye image, The personal identification device according to claim 4, further comprising: a determination unit that compares the determined density with the density reference value in the density reference value storage unit and determines whether the eye is a forged eye. 8. An imaging means for capturing an eye image of an eye of a person to be imaged, a density extracting unit for extracting each density of a plurality of specific regions of the captured eye image, and a forgery image of the eye. A density ratio reference storing a density ratio reference value created based on the density ratio of the corresponding plurality of specific regions and the density ratio of the corresponding plurality of specific regions of the image of the human eye obtained in advance. A value storage unit; a density ratio extraction unit that extracts a ratio of the extracted densities of the plurality of specific regions; and a comparison between the extracted density ratio and the density ratio reference value of the density ratio reference value storage unit. And a determining unit for determining whether the eye is a falsified eye. 9. The personal identification device according to claim 8, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 10. The personal identification apparatus according to claim 8, wherein the eye image includes a peripheral part of the eye, and the peripheral part is the specific area. 11. A density reference value storage unit that stores density reference values created based on the respective densities of the corresponding specific regions of the images of the forged eye and the human eye obtained in advance, and The personal identification device according to claim 8, further comprising: a determination unit that compares the obtained density with the density reference value in the density reference value storage unit to determine whether the eye is a forged eye. 12. A density created based on a density difference between the plurality of specific areas corresponding to the forged eye image and a density difference between the plurality of specific areas corresponding to the previously obtained human eye image. A density difference reference value storage unit that stores a difference reference value; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; a density difference and the density difference reference value The personal identification device according to claim 8, further comprising: a determination unit that compares the density difference reference value in a storage unit to determine whether the eye is a forged eye. 13. An image pickup means for picking up an eye image of an eye of a person to be imaged, an area extracting section for extracting at least one or more specific areas of the picked-up eye image; A density differential reference value storage unit that stores a density differential reference value created based on a density differential value obtained by differentiating each density of the specific region corresponding to each image of the human eye; A density differential extraction unit for differentiating the density of the specified area, and comparing the extracted density differential value with the density differential value of the density differential reference value storage unit to determine whether the eye is forged. A personal identification device, comprising: 14. The personal identification device according to claim 13, wherein the density differential value is a higher-order differential value obtained by performing higher-order differentiation on the density. 15. The personal identification device according to claim 13, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 16. The eye image includes a peripheral part of the eye, and the peripheral part is also the specific area.
3. The personal identification device according to 3. 17. A density reference value storage unit storing a density reference value created based on each density of a corresponding specific region of each image of a forged eye and a previously obtained human eye image, 14. The personal identification device according to claim 13, further comprising: a determination unit that compares the determined density with the density reference value in the density reference value storage unit to determine whether the eye is a forged eye. 18. A density created based on a density difference between the plurality of specific areas corresponding to a forged eye image and a density difference corresponding to the plurality of specific areas corresponding to a previously obtained human eye image. A density difference reference value storage unit that stores a difference reference value; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; a density difference and the density difference reference value 14. The personal identification device according to claim 13, further comprising: a determination unit that compares the density difference reference value in a storage unit to determine whether the eye is a forged eye. 19. A density created based on a density ratio of the plurality of specific regions corresponding to a forged eye image and a density ratio of the plurality of specific regions corresponding to a previously obtained human eye image. A density ratio reference value storage unit that stores a ratio reference value; a density ratio extraction unit that extracts a ratio of the extracted densities of the plurality of specific regions; a density ratio and the density ratio reference value 14. The personal identification device according to claim 13, further comprising: a determination unit configured to compare the density ratio reference value in a storage unit and determine whether the eye is a forged eye. 20. An image pickup means for picking up an eye image of an eye of a person to be imaged, an area extracting unit for extracting a plurality of specific areas of the picked-up eye image, and an image corresponding to a forged eye image. A difference between a density differential value obtained by differentiating each density of a plurality of specific areas and a density differential value obtained by differentiating each density of the plurality of specific areas corresponding to a previously obtained human eye image. A density differential difference reference value storage unit storing a density differential difference reference value created based on the above, and a density for differentiating each of the extracted densities of the plurality of specific regions to extract a density differential value difference. A differential difference extraction unit, and a determination unit for comparing the extracted density differential value difference with the density differential difference reference value of the density differential difference reference value storage unit to determine whether the eye is forged. A personal identification device characterized by including. 21. The personal identification device according to claim 20, wherein the density differential value is a higher-order differential value obtained by higher-order differentiation of the density. 22. The personal identification device according to claim 20, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 23. The apparatus according to claim 20, wherein the eye image includes a peripheral part of the eye, and the peripheral part is the specific area.
Described personal identification device. 24. A density reference value storage unit that stores density reference values created based on the respective densities of the corresponding specific areas of the images of the forged eye and the human eye obtained in advance, and 21. The personal identification device according to claim 20, further comprising: a determination unit that compares the determined density with the density reference value in the density reference value storage unit to determine whether the eye is a forged eye. 25. A density created based on a density difference between the plurality of specific areas corresponding to a forged eye image and a density difference between the plurality of specific areas corresponding to a previously obtained human eye image. A density difference reference value storage unit that stores a difference reference value; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; a density difference and the density difference reference value 21. The personal identification device according to claim 20, further comprising: a determination unit that compares the density difference reference value in a storage unit to determine whether the eye is a forged eye. 26. A density created based on a density ratio of the plurality of specific areas corresponding to a forged eye image and a density ratio of the plurality of specific areas corresponding to a previously obtained human eye image. A density ratio reference value storage unit that stores a ratio reference value; a density ratio extraction unit that extracts a ratio of the extracted densities of the plurality of specific regions; a density ratio and the density ratio reference value 21. The personal identification device according to claim 20, further comprising: a determination unit that compares the density ratio reference value in a storage unit and determines whether the eye is a forged eye. 27. An image pickup means for picking up an eye image of an eye of a person to be imaged, an area extracting unit for extracting a plurality of specific areas of the picked-up eye image, and an image corresponding to a forged eye image. A ratio of a density differential value obtained by differentiating each density of a plurality of specific areas and a density differential value obtained by differentiating each density of the plurality of specific areas corresponding to a previously obtained human eye image. A density differential ratio reference value storage unit that stores a density differential ratio reference value created based on the above, and a density for extracting a density differential value ratio by differentiating each of the extracted densities of the plurality of specific regions. A differential ratio extraction unit, and a determination unit that compares the extracted density differential value ratio with the density differential ratio reference value of the density differential ratio reference value storage unit to determine whether the eye is forged. A personal identification device characterized by including. 28. The personal identification device according to claim 27, wherein the density differential value is a higher-order differential value obtained by higher-order differentiation of the density. 29. The personal identification device according to claim 27, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 30. The eye image includes a peripheral portion of the eye, and the peripheral portion is the specific region.
Described personal identification device. 31. A density reference value storage unit storing a density reference value created based on each density of a corresponding specific region of each image of a forged eye and a previously obtained human eye image, 28. The personal identification device according to claim 27, further comprising: a determination unit that compares the determined density with the density reference value in the density reference value storage unit to determine whether the eye is a forged eye. 32. A density created based on a density difference between the plurality of specific regions corresponding to a forged eye image and a density difference between the plurality of specific regions corresponding to a previously obtained human eye image. A density difference reference value storage unit that stores a difference reference value; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; a density difference and the density difference reference value 28. The personal identification device according to claim 27, further comprising: a determination unit configured to compare the density difference reference value in a storage unit and determine whether the eye is a forged eye. 33. A density created based on a density ratio of the plurality of specific regions corresponding to a forged eye image and a density ratio of the plurality of specific regions corresponding to a previously obtained human eye image. A density ratio reference value storage unit that stores a ratio reference value; a density ratio extraction unit that extracts a ratio of the extracted densities of the plurality of specific regions; a density ratio and the density ratio reference value 28. The personal identification device according to claim 27, further comprising: a determination unit that determines whether the eye is a forged eye by comparing the density ratio reference value in a storage unit. 34. An image pickup means for picking up an eye image of an eye of a person to be imaged, an area extracting unit for extracting at least one or more specific areas of the picked-up eye image; A spatial frequency reference value storage unit that stores a spatial frequency reference value created based on a spatial frequency value obtained by performing spatial frequency conversion on each density of the specific region corresponding to each image of the human eye, An extraction unit that converts the density of the extracted specific region into a spatial frequency to extract a spatial frequency value, and compares the extracted spatial frequency value with the spatial frequency value of the spatial frequency reference value storage unit, and forges. And a determining unit for determining whether the eye is a detected eye. 35. The personal identification apparatus according to claim 34, wherein the forged eye is one of a prosthetic eye, an eye on a photograph, and an eye on a printed matter. 36. The eye image includes a peripheral portion of the eye, and the peripheral portion is also the specific region.
4. The personal identification device according to 4. 37. A density reference value storage unit that stores density reference values created based on the densities of the corresponding specific areas of the images of the forged eye and the human eye obtained in advance, and 35. The personal identification device according to claim 34, further comprising: a determination unit that compares the determined density with the density reference value in the density reference value storage unit to determine whether the eye is a forged eye. 38. A density created based on a density difference between the plurality of specific areas corresponding to a forged eye image and a density difference between the plurality of specific areas corresponding to a previously obtained human eye image. A density difference reference value storage unit that stores a difference reference value; a density difference extraction unit that extracts a difference between the extracted densities of the plurality of specific regions; a density difference and the density difference reference value 35. The personal identification device according to claim 34, further comprising: a determination unit that determines whether the eye is a forged eye by comparing the density difference reference value in a storage unit. 39. A density created based on a density ratio of the plurality of specific areas corresponding to a forged eye image and a density ratio of the plurality of specific areas corresponding to a previously obtained human eye image. A density ratio reference value storage unit that stores a ratio reference value; a density ratio extraction unit that extracts a ratio of the extracted densities of the plurality of specific regions; a density ratio and the density ratio reference value 35. The personal identification device according to claim 34, further comprising: a determination unit that determines whether the eye is a forged eye by comparing the density ratio reference value in a storage unit. 40. The image capturing apparatus further comprising: a plurality of illumination means for irradiating the image-captured person with light having different wavelengths, wherein each time each of the illumination means irradiates light to the image-captured eye, An image of an eye is picked up.
35. The personal identification device according to claim 27. 41. A peripheral portion including the eye of the subject is irradiated with light from a diagonal direction by a pair of illuminating means disposed opposite to each other so as to create a shadow in the eye and the periphery thereof. Each time, the eye of the subject and its surroundings are imaged by an imaging unit to obtain each eye image corresponding to each of the lighting units, and the density regions of the binocular images are collated to obtain the image of the subject. A method for determining forgery of an eye, comprising determining whether or not the eye is forged.