JP2004328367A - Image photographic device and authentication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image photographing device capable of detecting glasses when an object is wearing a pair of glasses, and of photographing an image with a satisfactory iris pattern. <P>SOLUTION: The image photographing device is provided with an image photographing part 4 which photographs a plurality of images with mutually different distances to objects, a focusing degree calculation part 5 which calculates a focusing degree of the plurality of images, a glass wearing determination part 6 which determines whether or not the object wears a pair of glasses and a focused image determination part 7 which determines an image whose focusing degree becomes equal to or more than a prescribed threshold at a position closest to the object among the plurality of images as a focused image when the object is determined to be wearing a pair of glasses in the glass wearing determination part 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image capturing device that captures an image of a subject, and an authentication device that authenticates the subject using authentication information acquired from the captured image.
[0002]
[Prior art]
In recent years, when restricting access to important information such as personal information and confidential information, and performing entry / exit management to rooms with high security, unique iris, fingerprint, face or retina etc. An authentication device that performs personal authentication using information (so-called biometrics information) as authentication information has been put to practical use.
[0003]
For example, an image around the eye of a subject (hereinafter referred to as an eye image) is taken, authentication information is created by coding an iris part of the eye image, and the authentication information is registered in advance with the authentication information acquired from the subject. An iris authentication technique for performing personal authentication of a subject by comparing and collating the authentication information obtained has been proposed and put into practical use (for example, see Patent Document 1).
[0004]
In an authentication device using such an iris authentication technology (hereinafter referred to as an iris authentication device), various device configurations such as a stationary type and a handy type have been proposed according to the application. In the iris authentication device used, how to appropriately guide the position of the subject's eye to be within the angle of view of the image capturing unit of the iris authentication device has been a major issue.
[0005]
In order to solve this problem, for example, in a hand-held iris authentication device, two mirrors are arranged in advance at predetermined positions of the iris authentication device, and the person to be authenticated has his / her eyes set on the two iris authentication devices. There has been proposed a configuration in which an eye can be guided to an appropriate position by moving the device by hand to a position reflected in a mirror (for example, see Patent Document 2).
[0006]
[Patent Document 1]
Japanese Patent No. 3307936
[Patent Document 2]
JP 2000-207536 A
[0007]
[Problems to be solved by the invention]
However, in the handy-type iris authentication device as described above, when a subject who is a person to be authenticated wears glasses, no effective countermeasure has been taken for the detection.
[0008]
Further, in general, an iris authentication device irradiates near-infrared light (wavelength of about 700 nm to about 1000 nm) to a subject's eye to capture an image of an iris pattern having high contrast, and captures a reflected image thereof. For this reason, when the subject wears spectacles, the near-infrared light emitted to the eye is reflected on the front and back surfaces of the spectacle lens (hereinafter, abbreviated as lens surface), and the reflected image is reflected. Be photographed. Since this reflection has an adverse effect on the iris portion of the eye image, there is a problem that an image of a good iris pattern cannot be reliably taken.
[0009]
The present invention has been made in view of such a problem, and in a handy-type authentication device, an image capturing device capable of detecting when a subject wears glasses and capable of capturing an image of a good iris pattern, and an image capturing device capable of capturing the image. It is an object of the present invention to provide an authentication device using a password.
[0010]
[Means for Solving the Problems]
An image photographing apparatus according to the present invention includes an image photographing unit that photographs an image of a subject at a position at a different photographing distance from each other, and a focus degree calculating unit that calculates a focus degree of each of a plurality of images photographed by the image photographing unit. Part, a spectacles wearing determination unit that determines whether or not the subject wears spectacles, and when it is determined that the subject is wearing spectacles in the spectacles wearing determination unit, among a plurality of images, A focus image determination unit that determines an image whose degree of focus is equal to or more than a predetermined threshold value at the closest position to be an in-focus image of the eye.
[0011]
With this configuration, since the spectacles wear determination unit is provided, it is possible to determine whether the subject wears spectacles. Further, when it is determined that the subject is wearing spectacles in the spectacle wear determination unit, since the degree of focus is equal to or more than a predetermined threshold, and the image with the shortest shooting distance is determined as a focused image, It is possible to reduce the adverse effect of the reflection image on the lens surface of the eyeglasses on the eye image, particularly the iris image, and to obtain a focused image of the eye having a good iris pattern.
[0012]
Next, the image photographing apparatus of the present invention includes an image photographing unit that photographs images of a subject at positions different in photographing distance from each other, and calculates a degree of focus of each of a plurality of images photographed by the image photographing unit. A focus degree calculation unit, a spectacle wear determination unit that determines whether or not the subject wears spectacles, and a case where the spectacle wear determination unit determines that the subject wears spectacles, among a plurality of images In the relationship between the shooting distance and the degree of focusing of the image, when the degree of focusing changes to show the first maximum as the subject approaches, and then changes to show the second maximum, And a focused image determination unit that determines that an image whose shooting distance is shorter than the shooting distance corresponding to the second maximum is determined to be a focused image of the eye.
[0013]
With this configuration, since the spectacles wear determination unit is provided, it is possible to determine whether the subject wears spectacles. Furthermore, when it is determined that the subject is wearing glasses by the glasses wear determination unit, the degree of focus is equal to or greater than a predetermined threshold, and the shooting distance is shorter than the shooting distance corresponding to the second maximum. Since the image is determined to be a focused image, it is possible to obtain a good focused image of the eye in which the reflected image on the lens surface of the eyeglasses has a reduced adverse effect on the eye image, particularly the iris image.
[0014]
In addition, when the eyeglass wear determination unit determines that the subject does not wear glasses, the focused image determination unit determines that the focus degree at a position farthest from the subject among a plurality of images is equal to or greater than a predetermined threshold. According to the configuration in which the image to be determined to be an in-focus image of the eye, a focused image of a good iris pattern can be obtained when the subject is the naked eye without glasses, Irrespective of the presence or absence of an in-focus state, a focused image of the eye suitable for authentication can be obtained.
[0015]
Further, the spectacles wear determination unit is configured to determine that the subject is wearing spectacles when an image captured by the image capturing unit includes a predetermined number or more of pixels having a predetermined brightness or higher. Is also good.
[0016]
According to such a configuration, it is possible to determine whether or not the person to be authenticated is wearing spectacles, without the object to be authenticated being input by himself / herself.
[0017]
In addition, an input unit connected to the spectacle wear determination unit may be provided, and when a predetermined input is performed on the input unit, the spectacle wear determination unit may determine that the subject wears spectacles. .
[0018]
With such a configuration, it is possible to determine the wearing of the glasses with a simple configuration, and it is possible to realize an image capturing apparatus that is easy for the user to use.
[0019]
Further, a configuration including a light beam irradiation unit that irradiates a light beam to the subject may be employed.
[0020]
With such a configuration, an image of the eye with higher contrast can be captured.
[0021]
Furthermore, a configuration may be provided that includes a light beam irradiation control unit that increases the intensity of a light beam irradiated to the light beam irradiation unit when the degree of focus exceeds a predetermined threshold value in the focus degree calculation unit.
[0022]
With such a configuration, the intensity of the light beam is increased in the light beam irradiating section after the degree of focus exceeds the predetermined threshold value, so that an image of the eye with higher contrast can be taken and the predetermined focus value can be obtained. Since the light intensity may be low until the degree of focus is obtained, power consumption can be reduced, and an image capturing apparatus suitable for mounting on a hand-held apparatus can be realized.
[0023]
Further, a configuration may be provided that includes a guidance information output unit that outputs guidance information for guiding a subject to a shooting distance such that a focused image can be obtained.
[0024]
With such a configuration, guidance information for guiding the user to a position where a focused image is obtained is output to the person to be authenticated. Can be reduced when the user is moved to a position where is obtained.
[0025]
Further, the guidance information is information by voice, and a guidance information output control unit that modulates the frequency of the audio information to the guidance information output unit and outputs the modulated information based on the degree of focus calculated by the focus degree calculation unit. It may be provided with a configuration.
[0026]
With this configuration, it is possible to realize a configuration in which the frequency of the audio information increases as the degree of focus increases, or a configuration in which the frequency decreases as the focus level increases. Therefore, a guidance method with less burden on the user can be realized.
[0027]
Further, the configuration may be such that the irradiation light emitted from the light irradiation unit is near-infrared light.
[0028]
With such a configuration, a high-contrast image of the iris can be captured.
[0029]
Next, the authentication device of the present invention is stored in the above-described image photographing device of the present invention, a focused image storage unit that stores the focused image determined by the focused image determination unit, and a focused image storage unit. An authentication information creation unit for creating authentication information from a focused image, and a comparison and collation unit for comparing and collating registered authentication information registered in advance with authentication information created by the authentication information creation unit are provided. .
[0030]
With such a configuration, it is possible to detect eyeglasses of a person to be authenticated with a simple configuration, to capture a good eye image even when eyeglasses are worn, and to obtain a small authentication device with a high authentication rate. realizable.
[0031]
Further, the authentication information creation unit may be configured to create the authentication information by coding an iris image obtained from the image of the subject.
[0032]
With such a configuration, a high identity authentication rate can be realized using authentication information obtained by coding an iris image.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0034]
FIG. 1 is a block diagram illustrating a configuration of an image capturing device and an authentication device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining how to use the authentication device according to the embodiment of the present invention. Further, FIG. 3 is a diagram showing an appearance of a mobile phone device equipped with the authentication device according to the embodiment of the present invention.
[0035]
First, the image photographing apparatus 1 of the present invention photographs the eye 2 of the person to be authenticated, and outputs a focused eye image (hereinafter, referred to as a focused image). In addition, the authentication device 3 of the present invention creates an iris code as authentication information from an image output from the image photographing device 1 and compares and collates it with registered authentication information stored in advance, thereby authenticating the person to be authenticated. . Further, as shown in FIG. 2, the authentication apparatus 3 of the present invention performs image capturing and authentication while the user to be authenticated holds the housing close to the housing.
[0036]
Returning to FIG. 1, the image capturing apparatus 1 according to the embodiment of the present invention captures an eye image of a person to be authenticated at fixed time intervals, for example, every 1/30 second, so that the image capturing apparatus 1 can capture images at different shooting distances from each other. The image photographing unit 4 for photographing the image of the image, the focus degree calculating unit 5 for calculating the degree of focus of the image photographed by the image photographing unit 4 (hereinafter, referred to as the degree of focus), and the image photographing unit 4 The focus calculated by the spectacles wear determination unit 6 and the focus degree calculation unit 5 that determines that the subject is wearing spectacles when a portion having a predetermined luminance or more is detected in the captured image. A focused image determination unit 7 that determines whether or not the image captured by the image capturing unit 4 is a focused image based on whether the degree is equal to or greater than a predetermined threshold; A light beam irradiating unit 8 for irradiating external light, and a light beam irradiating unit for controlling the intensity of the light beam radiated from the light beam irradiating unit 8 Control unit 9, the guidance information output unit 10 for outputting guidance information to be described later with respect to the person to be authenticated, and includes a guidance information output control section 11 for controlling the output of the guide information outputted from the guide information output section 10.
[0037]
The image photographing unit 4 can be realized by a known device that can photograph an image at regular intervals using an optical system.
[0038]
The degree-of-focus calculation unit 5 can use a so-called high-pass filter that extracts and integrates high-frequency components of each image captured by the image capturing unit 4.
[0039]
The spectacles wearing determination unit 6 determines whether a subject is a subject when a predetermined number or more of pixels having a predetermined luminance or more exist in the image captured by the image capturing unit 4 due to the influence of reflected light from a frame of the glasses or the like. The configuration may be such that it is determined that the authenticator wears glasses, or if the input unit (not shown) is connected to the glasses wear determination unit 6 and there is a predetermined input from the input unit, May be configured to determine that the user is wearing glasses. Here, as a predetermined input method, for example, a method of performing an operation that can be easily remembered by various users, such as a long press of a predetermined direct key and a double press of a start key, is practical.
[0040]
The focused image determination unit 7 determines that the image is a focused image if the degree of focus of each image calculated by the degree of focus calculation unit 5 is equal to or more than a predetermined threshold, and determines the focus image if the degree of focus is equal to or less than the predetermined threshold. It determines that the image is not a focused image and outputs a focused image.
[0041]
Note that the functions of the focus degree calculation unit 5, the spectacle wear determination unit 6, and the focused image determination unit 7 can also be realized by software.
[0042]
As the light irradiation unit 8, for example, a known light emitting diode (LED) that generates a near infrared ray can be used.
[0043]
The guidance information output unit 10 causes the user to guide the position of the eye 2 of the person to be authenticated to a predetermined position using sound, light rays, or the like as described later.
[0044]
Next, the authentication device 3 of the present invention includes the above-described image photographing device 1 of the present invention, a focused image storage unit 12 for storing a focused image output from the focused image determination unit 7 of the image photographing device 1, The authentication information creation unit 13 that creates an iris code, which is authentication information, by a known method (for example, see the method described in Patent Literature 1) using the image stored in the focused image storage unit 12 and the storage unit 14 A comparison / collation unit 16 for comparing and collating the stored registered authentication information 15 with the authentication information created by the authentication information creation unit 13, and a result of comparison / matching by the comparison / matching unit 16, that is, a match or a mismatch. And a display unit 17 for displaying.
[0045]
A well-known frame memory or the like can be used as the focused image storage unit 12, and a well-known disk device or memory can be used as the storage unit 14 as appropriate.
[0046]
Further, as a method of creating an iris code from an image in the authentication information creating unit 13 and a method of comparing and matching authentication information in the comparison and matching unit 16, for example, the method described in Patent Document 1 described above can be used. However, the authentication device 3 of the present invention is not limited to this method, and can create and collate the authentication information using any known method such as pattern matching.
[0047]
Further, as the display unit 17, a known display unit, for example, a liquid crystal display or an LED can be used.
[0048]
Next, each configuration of the authentication device 3 of the present invention is used by being incorporated in, for example, the mobile phone device 20 shown in FIG.
[0049]
Here, the mobile phone device 20 includes a microphone unit 21 and a speaker unit 22 used during a voice call, a key unit serving as an input unit for inputting a telephone number of a destination, inputting text information such as mail, and key input such as a URL. The authentication device 3 according to the embodiment of the present invention is mounted on a known mobile phone device including an antenna unit 23 for transmitting and receiving radio waves, a display unit 17 such as a liquid crystal display, an EL, and an LED. In addition, as the mobile phone device 20 according to the embodiment of the present invention, a configuration in which the upper housing 28 and the lower housing 29 are foldably connected by the hinge portion 27 has been described, but the present invention is limited to this form. It does not do.
[0050]
In the mobile phone device 20 according to the embodiment of the present invention, the display unit 17 of the upper housing 28 has a pair of light irradiation units 8 on the lower side in FIG. 3 and a hole 25 between the light irradiation units 8. A mirror section 26 is provided, and the optical system of the image photographing section 4 can be seen through the hole 25. The reason why the pair of light beam irradiators 8 is provided here is to capture an eye image with high contrast and little blur that is sufficient to create an iris code.
[0051]
The mirror 26 is used to guide the position of the eye 2 of the person to be authenticated to a predetermined position, as described later.
[0052]
The operation of the authentication device 3 according to the embodiment of the present invention as described above will be described step by step with reference to the drawings.
[0053]
FIG. 4 is a flowchart showing operation steps of the authentication device 3 according to the embodiment of the present invention.
[0054]
First, when authentication by the authentication device 3 is started by the user to operate the key unit 23, the light beam irradiation control unit 9 causes the light beam irradiation unit 8 to irradiate a light beam. Thus, the eye 2 of the person to be authenticated is irradiated with near-infrared light (S1).
[0055]
Here, the person to be authenticated moves the authentication device 3 to a position where his or her eye 2 is reflected on the mirror 26, that is, a position where the iris of the eye 2 just overlaps the hole 25. Thus, the subject can place his or her eyes 2 on the optical axis of the optical system of the image capturing unit 4. That is, the position of the eye 2 can be guided so as to have a recognizable positional relationship in the X-axis direction and the Y-axis direction in FIG. Further, the person to be authenticated moves the authentication device 3 so as to approach the Z-axis direction (rightward in FIG. 2) in FIG.
[0056]
Next, the image capturing unit 4 captures an image at regular intervals, that is, intermittently, while the authentication target moves the authentication device 3 closer to the user (S2).
[0057]
The photographed image is sent from the image photographing unit 4 to the focusing degree calculating unit 5 and the spectacles wearing determining unit 6, and the focusing degree calculating unit 5 extracts the high frequency component from the image as described above to obtain the focused image. The degree of focus is calculated (S3).
[0058]
The spectacles wear determination unit 6 counts the number of pixels having a predetermined brightness or more in the transmitted image, and when the counted number of pixels is equal to or more than the predetermined threshold, the subject wears the spectacles. It is determined that there is (S4). On the other hand, the image is sent to the in-focus image determination unit 7, and it is determined whether or not the image is a in-focus image as described later.
[0059]
If the eyeglass wear determination unit 6 is configured to determine that the subject wears glasses when a predetermined key input is performed from the input unit connected as described above, step S4 In, when a predetermined key input is performed from the input unit, it is determined that the subject is wearing glasses.
[0060]
The result of the determination as to whether or not the person to be authenticated wears the spectacles in the spectacle wear determination unit 6 is sent to the focused image determination unit 7, and a different focused image is determined depending on whether or not the spectacles are worn. (S5, S6).
[0061]
Next, the details of the focused image determination processing in the focused image determination unit 7 of the authentication device 3 of the present invention will be described.
[0062]
FIG. 5 is a diagram for explaining the function of the focused image determination unit 7 of the authentication device 3 according to the embodiment of the present invention. Here, a case will be described as an example in which a person to be authenticated holds the authentication device 3 and performs authentication while approaching the authentication device 3.
[0063]
The graph shown in FIG. 5 is a graph showing the relationship between the time at which an image was captured and the degree of focus (hereinafter, referred to as a focus degree curve). In the graph shown in FIG. 5, the vertical axis represents the degree of focus of an image captured at predetermined time intervals while approaching the device in the focus degree calculation unit 5 for each image, and the horizontal axis represents the image captured. It is time. In this case, since the subject performs image capturing at a predetermined time interval while approaching the authentication device 3, the horizontal axis indicates the image capturing distance, and the image capturing distance increases in the right direction (the direction in which time elapses). Get closer.
[0064]
As shown in FIG. 5, first, when the person to be authenticated does not wear glasses, that is, in the case of naked eyes, as the person to be authenticated approaches the authentication device 3, the degree of focus gradually increases as indicated by a broken line. And shows a maximum 41 in a state where the iris is in focus (focusing), and decreases as the iris is further approached. As described above, in the state of the naked eye in which the subject does not wear spectacles, the number of the values indicating the maximum 41 indicated by the degree of focusing according to the change in the distance is one.
[0065]
In such a case, the in-focus image determination unit 7 determines that an image in which the in-focus degree P1 that has reached the predetermined threshold TH or more for the first time is obtained as the in-focus image in the broken-point in-focus degree curve in FIG. (S6).
[0066]
FIG. 6A shows an example of an image determined to be a focused image in this way. As shown in FIG. 6A, in the focused image 51 with the naked eye, the reflection image 30 of the light irradiation unit 8 on the cornea is reflected on the pupil and does not cover the iris area. Therefore, a good iris image can be captured.
[0067]
When the person to be authenticated has no naked eyes, the focused image determination unit 7 determines that the image captured within the range of the threshold value TH in FIG. What is necessary is just to set it as the in-focus image 51. Further, in a configuration in which the person to be authenticated captures the image while approaching the authentication device 3, when the image captured at the degree of focus P <b> 1 is set as the focused image 51 of the eye, the determination of the focused image 51 of the eye is performed more quickly. be able to.
[0068]
As described above, when the glasses wear determination unit 6 determines that the person to be authenticated does not wear glasses, the focused image determination unit 7 combines the images captured at the above-described focus degree P1. It is assumed that a focus image 51 is provided. In the case of a configuration in which the person to be authenticated captures the image while keeping the authentication device 3 away, the image captured at the degree of focus P2 may be used as the in-focus image 51 of the eye to quickly determine the in-focus image 51. It goes without saying that it can be done. In such a case, the focused image determination unit 7 sets the image captured at the focus degree P2 as the focused image 51.
[0069]
On the other hand, as shown by the solid line in FIG. 5, when the person to be authenticated wears glasses, when the person to be authenticated approaches the authentication device 3, the degree of focus gradually increases, and the first It goes high again above the local minimum 44 after it has fallen below the local maximum 42, indicating a second local maximum 43, and then falls. The first maximum 42 that appears as the distance is reduced is a maximum that indicates that the image is focused on the frame or the lens surface of the glasses, and the second maximum 43 that appears next is a peak that appears when the iris is focused.
[0070]
Therefore, in the above-described step S4, when a signal indicating that the subject is wearing spectacles is sent from the spectacle wear determination unit 6 to the focused image determination unit 7, the in-focus image determination unit Reference numeral 7 denotes the focus degree on the right side of the second maximal 43 on the paper surface, that is, the focus degree on the short distance side, of the images having the focus degree equal to or more than the predetermined threshold value TH in the solid line focus degree curve in FIG. It is determined that the image corresponding to P5 is a focused image (S5).
[0071]
The reason will be described. FIGS. 6B to 6D are examples of captured eye images.
[0072]
FIG. 6B is an image 52 corresponding to a focus degree P3 in which the focus degree exceeds a predetermined threshold value TH on the far side (the left side in FIG. 5) of the first maximum 42 in FIG. As shown in FIG. 6B, the image 52 has a high degree of focus because it is in focus (focused) on the lens surface or frame of the glasses, and the iris is in focus. Does not fit. Furthermore, in the image 52, the reflection 31 on the lens surface of the light beam irradiating section 8 covers the periphery of the iris, which makes it difficult to obtain an image of the iris.
[0073]
Next, FIG. 6C shows an image 53 corresponding to a focus degree P4 in which the focus degree exceeds a predetermined threshold value TH on the far side (left side in FIG. 5) of the second maximum 43 in FIG. In the image 53, although the iris is in focus, the reflection 31 on the lens surface of the light beam irradiating section 8 is still in the vicinity of the iris, and it is difficult to obtain a good image of the iris due to this influence.
[0074]
Further, FIG. 6D shows a case where the person to be authenticated further approaches the authentication device 3 and the degree of focus exceeds the threshold value TH on the side closer to the second maximum 43 in FIG. 5 (right side in FIG. 5). It is an image 54 corresponding to the degree of focus P5. In the image 54, the iris is in focus, and the reflection 31 of the light beam irradiating unit 8 covers the white eye area outside the iris area.
[0075]
By setting the image 54 corresponding to the focus degree P5 in which the focus degree on the side near the second maximum 43 in FIG. 5 (the right side in FIG. 5) exceeds the threshold value TH as a focused image, a favorable image is obtained. An image of the iris can be taken. It should be noted that, in either of the configuration in which the person to be authenticated captures an image while approaching the authentication device 3 or the configuration in which image capture is performed while moving away from the authentication device 3, it is desirable that the image 54 corresponding to the above-described focus degree P5 be a focused image. .
[0076]
Returning to FIG. 4, when the in-focus image is determined in the above-described steps S5 and S6, while no in-focus image is obtained, the process returns to step S2 to further capture an image. On the other hand, when a focused image is obtained, the focused image is sent from the focused image determination unit 7 to the focused image storage unit 12 (S7).
[0077]
The focused image stored in the focused image storage unit 12 is sent to the authentication information creation unit 13, and the registered authentication information 15 previously stored in the storage unit 14 and the authentication information created by the authentication information creation unit 13 are stored. Are compared and authenticated by the comparison / collation unit 16, and the result is displayed on the display unit 17 (S8).
[0078]
For the authentication processing in step S8, for example, various known methods can be used in addition to the method described in Patent Document 1.
[0079]
Note that the light irradiation control unit 9 is configured to increase the intensity of a light beam applied to the light irradiation unit when the degree of focus calculated by the focus calculation unit 5 exceeds a predetermined threshold LTH. May be. With such a configuration, when the degree of focus is equal to or less than the predetermined threshold LTH, a relatively low-intensity light beam is emitted, so that the power consumption of the entire apparatus can be reduced.
[0080]
Further, even in a configuration in which the guidance information output control unit 11 controls the guidance information output unit 10 to output different guidance information according to a change in the focus degree calculated by the focus degree calculation unit 5. Good. For example, when the guidance information is a sound, if the frequency of the guidance sound is increased or decreased as the degree of focus increases, a configuration can be realized in which the subject can easily guide his or her own distance.
[0081]
Although the image capturing device 1 according to the embodiment of the present invention has been described using the configuration mounted inside the authentication device 3, the image capturing device 1 according to the present invention is not limited to this. Needless to say, the configuration may be used alone or mounted on another information device or the like.
[0082]
Furthermore, in the image photographing apparatus 1 according to the embodiment of the present invention, the configuration has been described in which the person to be authenticated moves the image photographing apparatus 1 himself to perform photographing, but the image photographing apparatus 1 of the present invention is not limited to this. Needless to say, a configuration in which the image capturing apparatus 1 moves with respect to a subject by a known moving unit is also included in the image capturing apparatus of the present invention.
[0083]
In the image photographing apparatus 1 according to the embodiment of the present invention, a good eye image can be obtained even when the subject wears glasses. Therefore, in the authentication device 3 according to the embodiment of the present invention, the authentication information is described as being an iris code created from an eye image. However, the authentication device of the present invention is not limited to this. It goes without saying that any authentication information created from a human eye image such as a pattern can be used.
[0084]
【The invention's effect】
As described above, according to the present invention, in the handy-type authentication device, since the spectacle wearing determination unit is provided, it is possible to determine whether the subject is wearing spectacles. Further, when it is determined that the subject is wearing spectacles in the spectacle wear determination unit, since the degree of focus is equal to or more than a predetermined threshold, and the image with the shortest shooting distance is determined as a focused image, Image capturing apparatus capable of reducing the adverse effect of a reflected image on the lens surface of spectacles on an eye image, particularly an iris image, and obtaining a focused image suitable for authentication having a good iris pattern, and authentication using the same Equipment can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an image capturing device and an authentication device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating how to use the authentication device according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating an appearance of a mobile phone device equipped with the authentication device according to the embodiment of the present invention.
FIG. 4 is a flowchart showing operation steps of the authentication device according to the embodiment of the present invention;
FIG. 5 is a diagram illustrating a function of a focused image determination unit of the authentication device according to the embodiment of the present invention.
FIG. 6A illustrates an example of an image determined to be a focused image according to the embodiment of the present invention.
(B)-(d) is a diagram showing an example of an actually photographed eye image in the embodiment of the present invention.
[Explanation of symbols]
1 Image photographing device
2 Eyes (of the subject)
3 Authentication device
4 Image shooting unit
5 Focus degree calculator
6 Glasses wear judgment section
7 Focused image determination section
8 Light irradiation part
9 Light irradiation control unit
10 Guidance information output unit
11 Guidance information output control unit
12 Focused image storage
13 Authentication information creation unit
14 Storage unit
15 Registration credentials
16 Comparison and collation unit
17 Display
20 Mobile phone device
21 Microphone part
22 Speaker section
23 key part
24 Antenna part
25 holes
26 Mirror
27 Hinge
28 Upper case
29 Lower case
30 reflection image
31 Reflection
41 max
42 First maximum
43 Second maxima
44 tiny
51 Focused image
52-54 images

Claims (12)

An image capturing unit that captures images of the subject at different shooting distances from each other;
A focusing degree calculating unit that calculates a focusing degree of each of the plurality of images captured by the image capturing unit;
A spectacles wear determination unit that determines whether the subject is wearing spectacles,
When it is determined that the subject is wearing spectacles in the spectacles wearing determination unit, an image in which the degree of focus is equal to or greater than a predetermined threshold value at a position closest to the subject among the plurality of images. And an in-focus image judging section for judging that the in-focus image is an in-focus image. An image capturing unit that captures images of the subject at different shooting distances from each other;
A focusing degree calculating unit that calculates a focusing degree of each of the plurality of images captured by the image capturing unit;
A spectacles wear determination unit that determines whether the subject is wearing spectacles,
When it is determined that the subject is wearing glasses in the glasses wearing determination unit, among the plurality of images, in the relationship between the shooting distance and the degree of focus of the image, the subject approaches the subject. When the focus degree changes to indicate the second maximum after changing to indicate the first maximum, the focus degree is equal to or greater than a predetermined threshold, and the shooting distance is equal to or smaller than the second maximum. And an in-focus image determining unit that determines an image shorter than the shooting distance corresponding to the in-focus image to be the in-focus image of the eye. When it is determined that the subject does not wear glasses in the glasses wear determination unit, the focused image determination unit, the focus degree at the position farthest from the subject, among the plurality of images. The image photographing apparatus according to claim 1, wherein an image having a predetermined threshold or more is determined to be a focused image of the eye. The spectacles wear determination unit is characterized in that, when there are a predetermined number or more of pixels having a predetermined luminance or more in an image captured by the image capturing unit, the subject determines that the subject wears glasses. The image photographing device according to any one of claims 1 to 3, wherein An input unit connected to the glasses wear determination unit, wherein when a predetermined input is performed on the input unit, the glasses wear determination unit determines that the subject is wearing glasses. The image photographing apparatus according to claim 1, wherein the image photographing apparatus performs the photographing. The image photographing apparatus according to any one of claims 1 to 5, further comprising a light beam irradiating unit configured to irradiate the object with a light beam. 7. The apparatus according to claim 6, further comprising: a light beam irradiation control unit configured to increase the intensity of a light beam irradiated to the light beam irradiation unit when the degree of focus exceeds a predetermined threshold value in the focus degree calculation unit. An image capturing device according to claim 1. 8. A guidance information output unit for outputting guidance information for guiding the photographing distance to a distance at which the focused image can be obtained for the subject. 2. The image photographing device according to claim 1. The guidance information is audio information, and the guidance information output control that modulates and outputs the frequency of the audio information to the guidance information output unit based on the degree of focus calculated by the focus degree calculation unit. The image capturing apparatus according to claim 8, further comprising a unit. The image capturing apparatus according to any one of claims 6 to 9, wherein the irradiation light emitted from the light beam irradiation unit is near-infrared light. An image photographing apparatus according to any one of claims 1 to 10,
A focused image storage unit that stores the focused image determined by the focused image determination unit;
An authentication information creating unit that creates authentication information from the focused image stored in the focused image storage unit;
An authentication device, comprising: a comparison / collation unit configured to compare and collate registered authentication information registered in advance with the authentication information created by the authentication information creation unit. The authentication apparatus according to claim 11, wherein the authentication information creation unit creates the authentication information by encoding an iris image obtained from the image of the subject.

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