WO2017051696A1 - Iris authentication device - Google Patents

Abstract

The iris authentication device is equipped with: a plate-like door which has a first surface and a second surface aligned along a plate-like plane, a first window formed in the first surface, and a second window formed in the second surface; an imaging unit which captures an image, and which is housed between the first surface and the second surface of the door with the optical axis of an optical system for the imaging extending in a direction along the plate-like plane; an optical path bending part which is disposed between the first surface and the second surface and within the imaging range of the imaging unit, and which bends the optical path for the imaging toward the first window or toward the second window, thereby causing an image outside of the first window or the second window to be captured by the imaging unit; and an authentication processing part which executes iris authentication on the basis of the image captured by the imaging unit.

Description

Iris authentication device

The present invention relates to an iris authentication device that performs authentication by imaging the iris of a human eye.

Conventionally, iris authentication is known in which authentication is performed by imaging the iris of a human eye. Iris authentication is used to manage the access of people to areas where security needs to be ensured, such as rooms and buildings. In the iris authentication for managing the entrance and exit of such people, it is necessary to authenticate the person who enters the area and the person who exits the area, so the iris on the outer and inner walls near the entrance / exit of the area. Is provided (for example, refer to Patent Document 1).

JP 2001-118103 A

However, in the above-described technique, it is necessary to attach two iris photographing cameras to the outside and the inside of a room, a building, etc., and there is a disadvantage that the installation cost of the camera increases.
An object of the present invention is to provide an iris authentication device that can easily reduce the cost.

An iris authentication device according to one aspect of the present invention has a first surface and a second surface along a plate surface, a first window is formed on the first surface, and a second window is formed on the second surface. A plate-shaped door and an image are captured and housed between the first surface and the second surface of the door, and the optical axis of the optical system for imaging is in a direction along the plate surface. An image pickup unit extending between the first surface and the second surface and disposed within an image pickup range of the image pickup unit, and an optical path for the image pickup in the first window direction and the second window The optical path bending unit that images the outside of the first window or the outside of the second window by the imaging unit by bending in the direction, and iris authentication based on the captured image captured by the imaging unit An authentication processing unit to be executed.

An iris authentication device according to one aspect of the present invention has a first surface and a second surface along a plate surface, a first window is formed on the first surface, and a second window is formed on the second surface. An iris authentication apparatus attached to a formed plate-shaped door, which captures an image and is accommodated between the first surface and the second surface of the door, and an optical system for the imaging An imaging unit extending in a direction along the plate surface, and between the first surface and the second surface, disposed within an imaging range of the imaging unit, and an optical path for the imaging An optical path bending part that images the outside of the first window or the outside of the second window by the imaging unit by being bent in the first window direction and the second window direction, and imaging by the imaging unit And an authentication processing unit that performs iris authentication based on the captured image.

According to these iris authentication devices, the imaging unit is accommodated within the thickness of the door, and the optical path of the imaging unit is bent in the direction of the first and second windows provided on both sides of the door. The outside and inside of the door can be imaged. Thereby, the person who is outside the door and the person who is inside the door can be iris-authenticated based on the image captured by one imaging unit. As a result, since only one imaging unit is required, it is easier to reduce the cost than when cameras for imaging irises are installed on the outer and inner walls near the entrance and exit as in the background art. In addition, since iris authentication can be performed simply by replacing the door, it is not necessary to install cameras on the outside and inside walls near the entrance and exit as in the background art. As a result, it is easier to reduce the construction cost for installing the iris authentication device than the background art.

In addition, the optical path bending portion is disposed on the optical path, and the posture can be changed between a first posture in which the optical path is directed toward the first window and a second posture in which the optical path is directed toward the second window. An imaging direction in which the iris authentication device causes the imaging unit to image the outside of the first window or the outside of the second window by changing the attitude of the movable mirror. It is preferable to further include a switching unit.

According to this configuration, by changing the posture of the movable mirror, it is possible to image both sides of the door with a single photographing unit.

Further, it is preferable that the imaging direction switching unit periodically changes the posture of the movable mirror between the first posture and the second posture.

According to this configuration, since the imaging unit can alternately image both sides of the door, even if the user does not perform a special operation, only by positioning the eyes near the first window or the second window, Regardless of whether the user is inside or outside the door, the user's iris can be imaged and the iris can be authenticated.

In addition, the door has a vertical direction that is scheduled to be arranged vertically as a fitting, and the imaging direction switching unit, in the first and second postures, the imaging range, the first window and The posture of the movable mirror is changed so as to be directed in a plurality of directions along the vertical direction with respect to the outer side of the second window, and the imaging unit is disposed outward of the first window and the second window. It is preferable to capture the images in the plurality of directions with respect to.

According to this configuration, the iris can be imaged even for users with different eyes, such as children and adults, short people, and high people.

The optical path bent portion is disposed on the optical path, and includes a first bent portion that directs the optical path toward the first window and a second bent portion that directs the optical path toward the second window. It is preferable to include.

According to this configuration, since both sides of the door can be imaged without having a movable mirror, even if the user does not perform a special operation, only by positioning the eyes near the first window or the second window, Regardless of whether the user is inside or outside the door, the user's iris can be imaged and the iris can be authenticated. Further, by eliminating the need for the movable mirror, the durability of the iris authentication device is improved.

In addition, the door has a vertical direction that is scheduled to be arranged vertically as a fitting, and the first bent portion and the second bent portion are respectively configured to capture the imaging range and the first It is preferable to include a plurality of bent portions that are directed in a plurality of directions along the vertical direction with respect to the outside of the window and the second window.

According to this configuration, the iris can be imaged even for users with different eyes, such as children and adults, short people, and high people.

Further, it is preferable that the first bent portion and the second bent portion change the direction of the optical path by a mirror or a prism.

The mirror or prism makes it easy to bend the optical path.

Further, it is preferable that the first window and the second window are closed with a cold mirror having a plurality of reflecting surfaces extending in directions intersecting with the plurality of directions.

According to this configuration, since the cold mirror transmits infrared rays and reflects visible light, the user can place his / her eyes at an appropriate imaging position by allowing his / her eyes to be reflected on the cold mirror with visible light. Can be made. Also, by imaging with infrared light, an iris image can be captured regardless of the difference in iris color, and the iris authentication process is facilitated. Furthermore, if it illuminates with infrared light, it can illuminate without making the user feel dazzling.

Further, the authentication processing unit is based on first authentication based on an iris image included in the captured image, and inverted data obtained when the iris image is substantially inverted 180 degrees in the vertical direction and the horizontal direction. It is preferable to perform the second authentication.

On the first surface side and the second surface side of the door, since the optical path bending direction by the optical path bending portion is opposite, the images on both sides are images that are inverted 180 degrees vertically and horizontally. Therefore, according to this configuration, the first authentication based on the iris image included in the photographed image, and the second based on the inverted data obtained when the iris image is substantially inverted 180 degrees vertically and horizontally. By executing the authentication, it is possible to execute the iris authentication for the captured image captured on either side.

Further, in the first authentication, the authentication processing unit cuts the ring at a predetermined position with respect to the iris ring-shaped image obtained from the photographed image, and pushes both sides of the cut ring. In this way, the belt-shaped band data is generated, authentication is performed based on the band data, and in the second authentication, the ring is applied to the ring-shaped image of the iris obtained from the photographed image. A band-shaped data is generated by cutting at a position, spreading both sides of the cut ring, and cutting the band-shaped data at the central position in the length direction of the band. It is preferable that the inverted data is generated by switching and connecting and authentication is performed based on the inverted data.

According to this configuration, in the second authentication, for the ring-shaped image of the iris obtained from the photographed image, the ring is cut at a predetermined position, and both sides of the cut ring are pushed and widened. The band image data is generated, the band data is cut at the central position in the length direction of the band, and the positions of both pieces of the cut data are switched and connected to invert the iris image 180 degrees vertically and horizontally. Since the inverted data similar to the case is obtained, the arithmetic processing can be simplified as compared with the case where the iris image is inverted 180 degrees vertically and horizontally.

In addition, it is preferable that the authentication processing unit determines that the iris authentication is successful when one of the first authentication and the second authentication is successful.

According to this configuration, iris authentication can be performed correctly regardless of whether the user authenticates on either the outside or inside of the door.

In addition, the authentication processing unit may determine whether the authentication is successful among the first surface side and the second surface side of the door, depending on whether the first authentication or the second authentication is successful. It is preferable to determine which side the authentication is for.

According to this configuration, based on the authentication result, it can be determined whether the user has authenticated on the outside or inside of the door.

An iris authentication apparatus according to one aspect of the present invention includes an iris authentication that has a first surface and a second surface along a plate surface, and is attached to a plate-like door having a first window formed on the first surface. An apparatus that captures an image and is accommodated between the first surface and the second surface of the door, and an optical axis of an optical system for the imaging extends in a direction along the plate surface The imaging unit is disposed between the first unit and the first surface and the second surface and is disposed within the imaging range of the imaging unit, and the optical path for the imaging is bent in the first window direction. An optical path bending unit that images the outside of the first window by the unit, and an authentication processing unit that performs iris authentication based on the captured image captured by the imaging unit, and the door is vertical as a fitting The optical path bent portion has the imaging range. Directing a plurality of directions aligned along the vertical direction with respect to the outside of the first window.

According to this configuration, the iris can be imaged even for users with different eyes, such as children and adults, short people, and high people. In addition, the optical path bending unit can direct the imaging range of the imaging unit in a plurality of directions aligned along the vertical direction so that the user's iris with different eye heights can be imaged. As a result, since it is not necessary to provide a plurality of imaging units corresponding to users with different eye heights, it is easier to reduce costs compared to the case where a plurality of imaging units corresponding to a plurality of directions are provided.

The optical path bending portion is a movable mirror that is arranged on the optical path and configured to be capable of changing its posture to a plurality of postures that direct the optical path in a plurality of directions along the vertical direction, and the iris authentication device Changes the attitude of the movable mirror so that the imaging range is directed in a plurality of directions along the vertical direction with respect to the outside of the first window by changing the attitude of the movable mirror. It is preferable that the imaging unit further includes an imaging direction switching unit, and the imaging unit captures images in the plurality of directions with respect to the outside of the first window.

According to this configuration, since a single movable mirror can be used to capture images in a plurality of directions aligned in the vertical direction, the optical path bent portion can be configured with a simple configuration.

The optical path bent portion includes a plurality of bent portions that are arranged on the optical path and direct the imaging range in a plurality of directions along the vertical direction with respect to the outside of the first window. But you can.

According to this configuration, since the movable mirror can be omitted, the durability of the iris authentication device is improved.

In addition, the imaging direction switching unit executes an attitude changing process for changing the attitude of the movable mirror so that the imaging range is sequentially directed toward the plurality of directions, and the iris authentication device is configured to change the attitude of the movable mirror. A posture determination unit that determines whether or not a human eye is within the imaging range of the imaging unit according to a change, and the imaging when the posture determination unit determines that the eye is within the imaging range It is preferable to further include an imaging processing unit that stops the posture change by the direction switching unit.

According to this configuration, since the posture changing process for changing the posture of the movable mirror is performed so that the imaging range is sequentially directed in a plurality of directions, a plurality of directions are scanned and imaged. become. If there is a human eye within the imaging range of the imaging unit in the scanning process, that is, when the eye is found and iris authentication is possible, the posture change by the imaging direction switching unit is stopped. Therefore, since it is not necessary to constantly change the attitude of the movable mirror, energy consumption for driving the movable mirror is reduced, and consumption and deterioration of the movable mirror drive mechanism are reduced.

The imaging unit sequentially captures the images in the plurality of directions according to the change in the posture of the movable mirror, and the posture determination unit applies the captured image to the captured image every time the image capturing unit captures the image. It is preferable to determine whether or not there is a human eye within the imaging range based on whether or not the human eye is reflected.

According to this configuration, it is determined whether or not a human eye is reflected in the image captured by the imaging unit while changing the orientation of the movable mirror and thus changing the direction of the imaging range. When the human eye is reflected in the image captured by the imaging unit, the human eye is in the imaging range, so it is possible to determine whether the human eye is in the imaging range. it can.

Further, a human body detection unit that detects the location of a human body in the plurality of imaging ranges corresponding to the plurality of directions, and the imaging direction switching unit is configured to perform the posture change process according to a human body detection result by the human body detection unit. It is preferable to start execution.

According to this configuration, the human body detection unit detects the location of the human body in a plurality of imaging ranges corresponding to a plurality of directions, that is, in a range that can be imaged by the imaging unit. Then, execution of the posture changing process is started according to the detection result of the human body by the human body detection unit. Therefore, the posture changing process can be started after the person who is the subject of iris authentication comes in a direction in which the person can take an image. As a result, it is not necessary to constantly change the attitude of the movable mirror, energy consumption for driving the movable mirror is reduced, and consumption and deterioration of the drive mechanism of the movable mirror are reduced.

In addition, it further includes a direction detection infrared detection unit that detects infrared rays emitted from the human body and has directivity in the detection direction, and the imaging direction switching unit is configured to change the direction of the imaging range in accordance with a change in posture of the movable mirror. The posture determination unit determines whether or not there is a human eye within the imaging range of the imaging unit based on the detection result of the infrared by the infrared detection unit for direction detection. Is preferred.

According to this configuration, since the infrared rays are detected by the direction detection infrared detection unit having directivity in the infrared detection direction of the human body, when a predetermined infrared ray is detected by the direction detection infrared detection unit, the detection direction is detected. There will be people. In addition, since the imaging direction switching unit directs the detection direction of the direction detection infrared detection unit to the direction of the imaging range in accordance with the change in the posture of the movable mirror, when a predetermined infrared ray is detected by the direction detection infrared detection unit, There is a person in the direction of the imaging range. Therefore, the posture determination unit can determine whether or not there is a human eye within the imaging range of the imaging unit, based on the detection result of the infrared rays by the direction detection infrared detection unit.

Further, the shooting direction switching unit, in the posture change process, a lower time for directing the imaging range in a direction belonging to a lower range preset in a lower side in the vertical direction among the plurality of directions, It is preferable that the ratio with respect to the upper time for directing the imaging range in a direction belonging to the upper range above the lower range can be changed.

According to this configuration, the lower time for directing the imaging range in the direction belonging to the lower range facing downward, and the upper time for directing the imaging range in the direction belonging to the upper range above the lower range The ratio can be changed. When a person stands in front of the door, the height of the eyes varies depending on the height of the person's back. Therefore, it is necessary to set the imaging range upward to image the eyes of a tall user, and to set the imaging range downward to image the eyes of a short user. Therefore, when using this iris authentication device, for users who are highly likely to use this authentication, for example, residents living in this door, if there are many tall people, the ratio of the upper time is increased. If there are many low people, the ratio of the lower time can be increased. As a result, the opportunity to image the user's eyes is increased, and the average waiting time until the user's eyes are detected and the iris authentication is executed can be shortened, so the average time required for the iris authentication is shortened. be able to.

Further, it further comprises a resident information receiving unit that receives resident information indicating the number of adults and the number of children living in the residence to which the door is attached, and the photographing direction switching unit is based on the resident information, It is preferable to increase the ratio of the lower time to the upper time as the ratio of the number of children to the number of adults is higher.

According to this configuration, as the number of children considered to be shorter than an adult is larger, the ratio of the lower time to the upper time is increased, that is, the imaging opportunity in the lower direction is increased. As the number of children is smaller, the ratio of the upper time to the lower time is increased, that is, the imaging opportunity in the upper direction is increased. As a result, the opportunity to image the user's eyes is increased, and the average waiting time until the user's eyes are found and the iris authentication is performed can be shortened, so the average time required for the iris authentication is shortened. be able to. In addition, the user can easily reduce the average time required for iris authentication simply by setting the number of adults and the number of children residing in the residence to which the door is attached in the resident information reception unit. .

Moreover, it is preferable that an imaging range changing unit that can change the direction of the imaging range along the width direction of the door is further provided.

The position where a person stands in front of the door may be biased to either the left or right side of the door depending on the structure of the door and the situation where the door is installed. Therefore, according to this configuration, the direction of the imaging range by the imaging unit can be changed along the width direction of the door by the imaging range changing unit. Thereby, even when the user stands on one of the left and right sides of the door, the user's eyes can be appropriately imaged.

Further, a handle for a user to grip is attached to the first surface of the door near the end in the width direction, and the direction of the imaging range is more than the normal direction of the first surface. Preferably, the handle is directed to the side on which it is attached.

Since the user tries to hold the handle when opening the door, the user often stands biased toward the side where the handle is attached. Therefore, according to this configuration, since the direction of the imaging range is directed to the side where the handle is attached rather than the normal direction of the first surface, the user is biased toward the side where the handle is attached to the door. Even when standing up, the user's eyes can be appropriately imaged.

Moreover, it is preferable to further include the door.

According to this configuration, since the door and the iris authentication device are integrated, it is easy to perform a construction that enables iris authentication by replacing the door.

Further, it is preferable that an electric lock for locking the door is further provided, and the authentication processing unit unlocks the electric lock when the authentication is successful.

According to this configuration, since the user can open and exit the door when the iris authentication is successful, it is easy to improve security.

The iris authentication device having such a configuration can easily reduce the cost.

It is a perspective view which shows an example of a structure of the iris authentication device which concerns on 1st embodiment of this invention. FIG. 2 is a II-II sectional view of the door shown in FIG. 1. It is explanatory drawing for demonstrating the relationship between the attitude | position of the movable mirror shown in FIG. 1, and the imaging direction of an imaging part. It is a block diagram which shows an example of the electrical structure of the iris authentication apparatus shown in FIG. It is explanatory drawing which shows an example of inversion processing. It is sectional drawing which shows an example of a structure of the iris authentication apparatus which concerns on 2nd embodiment of this invention. It is a block diagram which shows an example of an electrical structure of the iris authentication apparatus shown in FIG. It is explanatory drawing for demonstrating the captured image imaged with the iris authentication apparatus shown in FIG. It is explanatory drawing which shows notionally an example of a structure of the iris authentication apparatus which concerns on 3rd embodiment of this invention. It is explanatory drawing for demonstrating the imaging range change part which changes an imaging range along the width direction of a door. It is a flowchart which shows an example of operation | movement of the iris authentication apparatus shown in FIG.

Hereinafter, an embodiment according to one aspect of the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted.
(First embodiment)

FIG. 1 is a perspective view showing an example of the configuration of an iris authentication apparatus according to the first embodiment of the present invention. An iris authentication apparatus 1 shown in FIG. 1 includes a door 2, an imaging unit 3, a movable mirror 4 (optical path bending unit), a control unit 5, a motor 6 (imaging direction switching unit), cold mirrors 71 and 72, and an electric lock 8. It has. The imaging unit 3, the movable mirror 4, the control unit 5, the motor 6, and the electric lock 8 are accommodated within the thickness of the door 2. The iris authentication device 1 is not limited to the example provided with the door 2. For example, the imaging unit 3, the movable mirror 4, the control unit 5, the motor 6, the cold mirrors 71 and 72, and the electric lock 8 are modularized to form an iris. The authentication device 1 may be used.

The door 2 has a substantially rectangular plate shape, and is attached to the building so that its longitudinal direction is the vertical direction along the vertical direction. In FIG. 1, the vertical direction, that is, the longitudinal direction of the door 2 is indicated by the X direction, and the horizontal direction, that is, the width direction of the door 2 is indicated by the Y direction.

The door 2 has a first surface 21 and a second surface 22 along the plate surface. The first surface 21 is a surface facing the outside of a building or room to which the door 2 is attached, for example, and the second surface 22 is a surface facing the inside of a building or room to which the door 2 is attached, for example. A handle (door knob) 25 is attached to the first surface 21, and a handle 26 is attached to the second surface 22. The first surface 21 is a surface facing the inside of a building or room to which the door 2 is attached, for example, and the second surface 22 is a surface facing the outside of the building or room to which the door 2 is attached, for example. There may be.

A substantially rectangular opening is formed at a position substantially at the center of the first surface 21 in the width direction and above the center in the up-and-down direction, for example, at the height of the line of sight of a person of average height. 23. A second window 24 similar to the first window 23 is formed at a position facing the first window 23 on the second surface 22. The first window 23 is closed with a cold mirror 71, and the second window 24 is closed with a cold mirror 72. The cold mirrors 71 and 72 are mirrors that transmit infrared light and reflect visible light.

A movable mirror 4 is disposed in a space between the first window 23 and the second window 24 and within the thickness of the door 2. The motor 6 rotates the movable mirror 4 and changes its tilt posture. The electric lock 8 advances and retracts the lock bolt 81 in accordance with a control signal from the control unit 5. Thereby, the electric lock 8 locks or unlocks the door 2. An imaging unit 3 and a control unit 5 are disposed below the movable mirror 4.

FIG. 2 is a II-II cross-sectional view of the door 2 shown in FIG. In FIG. 2, the motor 6 and the electric lock 8 are not shown. The cold mirror 71 has a reflecting surface 711 whose normal is directed in the horizontal direction, an upper reflecting surface 712 inclined with its normal extending upward from the reflecting surface 711, and its normal from the reflecting surface 711. And a lower reflecting surface 713 that is inclined downward. Similarly, the cold mirror 72 has a reflecting surface 721 whose normal is directed in the horizontal direction, an upper reflecting surface 722 that is inclined with its normal directed upward relative to the reflecting surface 721, and more than the reflecting surface 721. A lower reflection surface 723 inclined with the normal line directed downward is formed.

Thus, the reflecting surfaces 711 and 721 are arranged so that the line of sight intersects the reflecting surfaces 711 and 721 perpendicularly when a person of average height stands in front of the door 2, and the upper reflecting surfaces 712 and 722 are When a tall person stands in front of the door 2 and looks down on the upper reflecting surfaces 712 and 722 from above, the line of sight intersects the upper reflecting surfaces 712 and 722 perpendicularly, and the lower reflecting surfaces 713 and 723 are arranged. Are arranged so that the line of sight intersects with the lower reflecting surfaces 713 and 723 perpendicularly when a child or a short person stands in front of the door 2 and looks up the lower reflecting surfaces 713 and 723 from below.

The imaging unit 3 includes an imaging element 31 such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor), an optical system 32 that forms an image on the imaging element 31, and illumination that emits illumination light for imaging. Part 33. The optical system 32 is configured using one or a plurality of optical lenses, and its optical axis extends to the movable mirror 4 along the vertical direction, and the optical path for imaging of the imaging unit 3 is bent by the movable mirror 4. It is done. Therefore, the imaging range 322 that can be imaged by the imaging unit 3 can be changed according to the attitude of the movable mirror 4.

The movable mirror 4 is configured such that at least a part of the reflecting surface of the movable mirror 4 is located in the imaging range 322 in order to change the imaging range 322 of the imaging unit 3. The movable mirror 4 has reflecting surfaces on both sides.

FIG. 3 is an explanatory diagram for explaining the relationship between the posture of the movable mirror 4 shown in FIG. 1 and the imaging direction of the imaging unit 3. As shown in FIG. 3, when the movable mirror 4 is in the posture P11, the optical axis 321 that is the center of the imaging range 322 is orthogonal to the reflecting surface 711, and when the movable mirror 4 is in the posture P12, the optical axis 321 is the upper reflecting surface 712. The optical axis 321 is orthogonal to the lower reflecting surface 713 when the movable mirror 4 is in the posture P13. Thus, when the movable mirror 4 is in the postures P11, P12, and P13, the imaging unit 3 images the outside of the first window 23, that is, the outside of the door 2. Postures P11, P12, and P13 correspond to an example of a first posture.

When the movable mirror 4 is in the posture P21, the optical axis 321 is orthogonal to the reflecting surface 721. When the movable mirror 4 is in the posture P22, the optical axis 321 is orthogonal to the upper reflecting surface 722, and the light is emitted when the movable mirror 4 is in the posture P23. The axis 321 is orthogonal to the lower reflecting surface 723. Accordingly, when the movable mirror 4 is in the postures P21, P22, and P23, the imaging unit 3 images the outside of the second window 24, that is, the inside of the door 2. Postures P21, P22, and P23 correspond to an example of a second posture.

The illumination unit 33 is disposed, for example, in the vicinity of the optical system 32 and outputs illumination light toward the movable mirror 4. Accordingly, the illumination light output from the illumination unit 33 illuminates the outside of the cold mirrors 71 and 72 through the same optical path as the optical axis 321. The illumination unit 33 is configured using an infrared LED (Light Emitting Diode) that emits near infrared light that passes through the cold mirrors 71 and 72.

For example, a user who is outside the door 2 and wants to perform iris authentication to unlock the door 2 sees an easy-to-see reflective surface among the upper reflective surface 712, the reflective surface 711, and the lower reflective surface 713. Since the cold mirror 71 reflects visible light, for example, a user with an average height faces his / her eyes on the reflecting surface 711 when facing the reflecting surface 711 correctly. In this way, the user can capture his / her eyes on any of the upper reflection surface 712, the reflection surface 711, and the lower reflection surface 713, so that the imaging unit 3 can image the user's iris.

At this time, since the upper reflection surface 712, the reflection surface 711, and the lower reflection surface 713 are provided, even if the user has a different height, the imaging unit 3 can display the user's eyes on the reflection surface that is easy to see. Since the iris can be imaged, the iris authentication operation becomes easy.

In addition, the user's eyes are projected onto any of the upper reflection surface 712, the reflection surface 711, and the lower reflection surface 713, so that the user's iris is illuminated by the illumination light output from the illumination unit 33. This makes it possible to capture a good iris image. Moreover, since illumination light is invisible near-infrared light, the user who performs iris authentication is not dazzling.

FIG. 4 is a block diagram showing an example of the electrical structure of the iris authentication device 1 shown in FIG. The iris authentication apparatus 1 shown in FIG. 4 is configured by connecting a motor 6, an illumination unit 33, an image sensor 31, and an electric lock 8 to a control unit 5. The control unit 5 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a volatile or nonvolatile memory, and peripheral circuits thereof. And the control part 5 functions as the imaging process part 51, the image process part 52, and the authentication process part 53 by running the program memorize | stored, for example in the non-volatile memory. Moreover, the control part 5 is provided with the memory | storage part 54 comprised, for example from the non-volatile memory. The storage unit 54 stores in advance authentication reference data such as an iris image of a user who can be authenticated or feature data obtained from the iris image.

Note that all or part of the control unit 5 may be configured by a dedicated IC (Integrated Circuit) such as an ASIC (application specific integrated circuit).

The imaging processing unit 51 performs control for imaging the iris of the user to be authenticated. Specifically, the imaging processing unit 51 causes the illumination unit 33 to emit light, drives the motor 6, and periodically moves the movable mirror 4 to the postures P12, P11, P13, P23, P21, and P22. The posture is changed, and the captured image captured by the image sensor 31 in each posture is output to the image processing unit 52 together with posture information indicating the posture of the movable mirror 4 at the time of shooting. The imaging processing unit 51 only has to direct the imaging range 322 in a plurality of directions by the motor 6, and the movable mirror 4 does not necessarily have to be stationary in each of the postures P12, P11, P13, P23, P21, and P22. . For example, the imaging processing unit 51 causes the movable mirror 4 to pass through the postures P12, P11, P13, P23, P21, and P22 in the process of continuously rotating the movable mirror 4 by the motor 6, thereby setting the imaging range 322 in a plurality of directions. It may be configured to point to.

The imaging processing unit 51 is not limited to the example in which the movable mirror 4 is periodically changed in posture between the first posture (postures P12, P11, P13) and the second posture (P23, P21, P22). For example, the human sensor 91 may be provided outside the door 2 (on the first surface 21 side), and the human sensor 92 may be provided inside the door 2 (on the second surface 22 side). Then, when a person is detected by any of the human sensors 91 and 92, the imaging processing unit 51 may change the posture of the movable mirror 4 to a posture corresponding to the human sensor side that has detected the person. Alternatively, the operation switch 95 may be provided outside the door 2 and the operation switch 96 may be provided inside the door 2. Then, when any of the operation switches 95 and 96 is operated by the user, the imaging processing unit 51 may change the posture of the movable mirror 4 to a posture corresponding to the operated operation switch side. Further, for example, a handle sensor 97 that detects that the handle 25 provided outside the door 2 is operated, and a handle sensor 98 that detects that the handle 26 provided inside the door 2 is operated are provided. May be. Then, when an operation of the handle is detected by any of the handle sensors 97 and 98, the imaging processing unit 51 may change the posture of the movable mirror 4 to the posture corresponding to the handle sensor side that detected the operation.

The image processing unit 52 extracts an iris image from the captured image sent from the imaging processing unit 51 by a known image recognition technique. When the image from which the iris image is extracted is an image corresponding to the postures P12, P11, and P13 of the movable mirror 4 based on the posture information, the image processing unit 52 performs authentication on the outside of the door 2. If the image corresponds to the postures P23, P21, and P22 of the movable mirror 4, it is determined that the user has performed authentication inside the door 2.

This makes it possible to capture the irises of the users inside and outside the door 2 and to authenticate even if the image capturing unit 3 is one and the camera is not provided outside and inside the door 2. It can be determined whether the user is inside the door 2 or outside.

Note that the imaging processing unit 51 may be configured not to generate posture information, and the image processing unit 52 may not determine whether the authenticated user is inside or outside the door 2. And based on the authentication process result of the authentication process part 53 mentioned later, you may make it determine whether the user is inside the door 2 or the outer side.

The authentication processing unit 53 performs iris authentication using a known iris authentication technique based on the iris image sent from the imaging processing unit 51. Specifically, the authentication processing unit 53 uses the iris image sent from the imaging processing unit 51 or the feature data obtained from the image as the iris image or feature data stored in the storage unit 54. Iris authentication is performed by comparing with.

Here, an image taken outside the door 2 with the movable mirror 4 in the postures P11, P12, and P13 and an image taken inside the door 2 with the movable mirror 4 in the postures P21, P22, and P23 are: The top, bottom, left and right are inverted 180 degrees. Therefore, for example, when the authentication reference data is generated based on the iris image captured inside the door 2, the image captured outside the door 2 cannot be authenticated by the authentication reference data as it is.

Therefore, if the authentication processing unit 53 fails in authentication, the authentication processing unit 53 performs a reversal process corresponding to reversing the top / bottom / left / right of the iris image sent from the imaging processing unit 51, and obtained by the reversal process. Authentication is performed again based on the data. An authentication process based on data that is not subjected to the inversion process is referred to as first authentication, and an authentication process based on the data after the inversion process is referred to as second authentication.

In this way, the authentication processing unit 53 determines that the authentication is successful when the authentication is successful by either the first authentication based on the data that is not subjected to the reversal processing or the second authentication based on the data after the reversal processing. If authentication fails even for data, it is determined that authentication has failed.

FIG. 5 is an explanatory diagram showing an example of the inversion process. FIG. 5A shows processing of an image captured outside the door 2 with the movable mirror 4 in the postures P11, P12, and P13, for example, and corresponds to the first authentication. FIG. 5B shows processing of an image captured inside the door 2 with the movable mirror 4 in the postures P21, P22, and P23, and corresponds to the second authentication.

FIG. 5 (a-1) shows an eye image taken outside the door 2, and FIG. 5 (b-1) shows an eye image taken inside the door 2. FIG. In the example shown in FIG. 5, the eye image captured outside the door 2 is an upright image, and the eye image captured inside the door 2 is an inverted image. The captured eye image may be a reverse image, and the eye image captured inside the door 2 may be an erect image.

FIG. 5 shows an example in which the reference data for authentication stored in the storage unit 54 is based on an upright image captured outside the door 2. Note that the authentication reference data stored in the storage unit 54 may be data based on an iris image captured inside the door 2. As a method for registering the reference data for authentication, for example, an operation switch for registration is disposed at a position where the door 2 is not exposed to the outside when the door 2 is closed, such as an end face of the door tip side of the door 2, and the control unit 5 The reference data for authentication may be generated based on the iris image captured by the imaging unit 3 outside or inside the door 2 when this operation switch is operated, and stored in the storage unit 54.

First, the first authentication process shown in FIG. 5A will be described. An iris image K1 is extracted by the image processing unit 52 from the eye image shown in FIG. The authentication processing unit 53 cuts the ring from the iris image K1 at a preset position P1 so as to form a single band, and pushes both sides of the cut part of the cut ring. Band-shaped data K2 having a band shape is generated (FIG. 5 (a-2)).

Thus, the images corresponding to (1) to (5) of the iris image K1 shown in FIG. 5 (a-1) are arranged in a line in the band-like data K2 in FIG. 5 (a-2). It will be.

The belt-shaped data K2 may be a band-shaped image of the iris image K1 as it is. Alternatively, the band-shaped data K2 may be data in which, for example, data representing the feature of the iris is generated by binarizing the iris image K1, and the data representing the feature is banded.

By storing the belt-like data K2 obtained by photographing the user's eyes in advance in this manner as the reference data for authentication in the storage unit 54, the authentication processing unit 53 can obtain the data shown in FIG. 5 (a-2). The first authentication is executed by comparing the obtained band-shaped data K2 with the reference data for authentication.

Next, the second authentication will be described. For example, when the image processing unit 52 determines that the user is inside the door 2, the authentication processing unit 53, that is, on the side where an iris image inverted with respect to the iris image corresponding to the reference data for authentication is obtained. If it is determined that there is, the second authentication shown in FIG. In addition, the authentication process part 53 may perform 2nd authentication, when authentication fails by 1st authentication, and may always perform 1st and 2nd authentication.

First, an iris image K1 is extracted by the image processing unit 52 from the eye image shown in FIG. The authentication processing unit 53 cuts the ring from the iris image K1 at a position P1 that is set in advance so that the ring has a single band shape. At this time, the iris image K1 shown in FIG. 5 (b-1) is an image that is vertically and horizontally reversed from the iris image K1 shown in FIG. 5 (a-1). ) In FIG. 5B-1 corresponds to the lower side of the eye. Accordingly, in the iris image K1 shown in FIG. 5 (b-1), the image corresponding to (3) is located at the position P1.

Next, similarly to the first authentication, the authentication processing unit 53 generates band-shaped data K2 that is band-shaped so as to spread both sides of the cut part of the ring cut at the position P1 (FIG. 5 (b-2)). )). Then, as shown in FIG. 5 (b-2), the band-like data K2 is converted into data arranged in a line in the order of (3), (4), (5), (1), (2), (3). Become. Therefore, it is not possible to collate with the reference data for authentication as it is.

Next, the authentication processing unit 53 cuts the belt-like data K2 at the central position P2, and generates inverted data K3 by exchanging the positions of the two pieces of cut data and connecting them (FIG. 5 (b-3)). As shown in FIG. 5 (b-3), the inverted data K3 includes data corresponding to (1) to (5) arranged in a line in this order, and the band-like data shown in FIG. 5 (a-2). The same arrangement as K2. That is, the process of generating the inverted data K3 is substantially the same as the process of inverting the iris image K1 180 degrees in the vertical direction (X direction) and the horizontal direction (Y direction) perpendicular to the vertical direction. Thereby, the amount of calculation processing can be reduced as compared with the case where the iris image K1 is actually inverted 180 degrees vertically and horizontally.

In the second authentication, it is of course possible to actually flip the iris image K1 180 degrees vertically and horizontally.

Next, the authentication processing unit 53 executes the second authentication by comparing the inverted data K3 with the reference data for authentication. Thus, by performing the second authentication, it is possible to execute the iris authentication based on the iris image K1 inverted by the movable mirror 4.

The authentication processing unit 53 unlocks the electric lock 8 when the authentication is successful. Thereby, a user who has succeeded in authentication can open the door 2. In addition, the authentication process part 53 is not restricted to the example which unlocks the electric lock 8 when authentication is successful. For example, the authentication processing unit 53 may be configured to repeat unlocking and locking by a toggle operation every time authentication is successful. Further, for example, the right eye data and the left eye data of the user are stored in the storage unit 54 as the reference data for authentication, and unlocked when the right eye (or left eye) is successfully authenticated, and the left eye (or right eye). It is good also as a structure which locks when authentication succeeds by.

Further, the authentication processing unit 53 determines whether the authentication is successful among the first authentication and the second authentication, and the authentication is performed on the first surface 21 side (outside) and the second surface 22 side of the door 2. You may make it determine which side is authentication for (inside).
(Second embodiment)

Next, the iris authentication device 1a according to the second embodiment of the present invention will be described. FIG. 6 is a cross-sectional view showing an example of the configuration of the iris authentication device 1a according to the second embodiment of the present invention. FIG. 7 is a block diagram showing an example of the electrical configuration of the iris authentication device 1a shown in FIG. The iris authentication apparatus 1a shown in FIGS. 6 and 7 is different from the iris authentication apparatus 1 shown in FIGS. 2 and 4 in the following points. That is, the iris authentication device 1a shown in FIGS. 6 and 7 does not include the motor 6, and instead of the movable mirror 4, the first mirror 41 (first bent portion) and the second mirror 42 (second bent portion). With. Further, the operations of the imaging processing unit 51a and the image processing unit 52a are different.

Other configurations are the same as those of the iris authentication apparatus 1 shown in FIGS. 2 and 4, so the description thereof will be omitted, and the characteristic points of this embodiment will be described below.

The first mirror 41 and the second mirror 42 are fixedly disposed on the optical path of the imaging range of the imaging unit 3. In the example illustrated in FIG. 6, the first mirror 41 is disposed on the back side of the sheet, and the second mirror 42 is disposed on the front side of the sheet. The first mirror 41 includes a bent portion 411 that bends the optical path for imaging in the direction of the reflecting surface 711, a bent portion 412 that bends the optical path in the direction of the upper reflecting surface 712, and a bent portion that bends the optical path in the direction of the lower reflecting surface 713. Part 413. The second mirror 42 includes a bent portion 421 that bends the optical path for imaging in the direction of the reflecting surface 721, a bent portion 422 that bends the optical path in the direction of the upper reflecting surface 722, and a bent portion that bends the optical path in the direction of the lower reflecting surface 723. Part 423.

FIG. 8 is an explanatory diagram for explaining a captured image captured by the iris authentication device 1a illustrated in FIG. In the iris authentication device 1a, eye images G711, G721, G712, G722, G713, and G723 captured through the reflecting surfaces 711 and 721, the upper reflecting surfaces 712 and 722, and the lower reflecting surfaces 713 and 723 are used. Are arranged at different positions in the captured image A.

The imaging processing unit 51a is different from the imaging processing unit 51 in that the motor 6 is not driven and posture information is not generated. Since the other points are the same as those of the imaging processing unit 51, description thereof is omitted.

The image processing unit 52a is different from the image processing unit 52 in that in the captured image A, the user determines whether the user has performed authentication outside or inside the door 2 according to the position where the iris image is extracted. . Since the other points are the same as those of the image processing unit 52, the description thereof is omitted.

According to the iris authentication device 1a, since the movable mirror 4 and the motor 6 do not have to be used, the durability of the iris authentication device 1a is improved as a result of the reduction of movable parts.

In addition, although the example using a mirror was shown as a 1st bending part and a 2nd bending part, you may comprise a 1st bending part and a 2nd bending part using a prism. In addition, although the cold mirrors 71 and 72 each include a plurality of reflecting surfaces 711 and 721, upper reflecting surfaces 712 and 722, and lower reflecting surfaces 713 and 723, the number of the reflecting surfaces may be one. Only 711 and 721 may be configured. In this case, the movable mirror 4 of the iris authentication device 1 may have a configuration that can take the posture P11 and the posture P21.

Further, the cold mirrors 71 and 72 may not be provided. For example, the structure which closes the 1st window 23 and the 2nd window 24 with transparent glass may be sufficient, and the 1st window 23 and the 2nd window 24 may be made into the opening part.

In addition, the iris authentication device 1 does not include the second window 24 and the cold mirror 72 in FIGS. 1, 2, and 3. In FIG. 3, the imaging processing unit 51 is operated by the motor 6 (imaging direction switching unit). The movable mirror 4 may be configured to change its posture to each of the postures P12, P11, and P13 and not change its posture to each of the postures P23, P21, and P22.

Further, the iris authentication device 1a may be configured not to include the second window 24, the second mirror 42 (second bent portion), and the cold mirror 72 in FIGS.
(Third embodiment)

Next, an iris authentication device according to a third embodiment of the present invention will be described. FIG. 9 is an explanatory diagram conceptually showing an example of the configuration of the iris authentication device 1b according to the third embodiment of the present invention. The iris authentication device 1b shown in FIG. 9 is different from the iris authentication device 1 shown in FIG. 3 in that the human sensors 91 and 92 (human body detection unit), the rotary switches SW1 and SW2 (resident information reception unit), and the imaging unit 3 are used. The imaging range changing unit 9 that can change the imaging range along the width direction of the door 2, the infrared filtering 231, 241 instead of the cold mirrors 71, 72, and the configuration of the control unit 5 b Is different. The control unit 5b is different from the control unit 5 in that it further functions as the posture determination unit 55 and the operation of the imaging processing unit 51b.

Other configurations are the same as those of the iris authentication apparatus 1 shown in FIG. 3, so the description thereof will be omitted, and the characteristic points of the present embodiment will be described below.

The infrared filters 231 and 241 are optical filters that transmit infrared rays emitted from the human body and reduce visible light. The infrared filter 231 is attached to the first window 23 (outward window), and the infrared filter 241 is attached to the second window 24 (inward window). The infrared filters 231 and 241 may not be provided, and a cold mirror may be provided instead of the infrared filters 231 and 241. Alternatively, instead of providing the infrared filters 231 and 241 in the first window 23 and the second window 24, an infrared filter may be provided at the tip of the optical system 32.

Human sensors 91 and 92 are sensors that detect the location of a person. For example, by detecting infrared rays emitted by a human body, it is detected whether or not a person is present in the detection range. The detection range of the human sensor 91 is set to a predetermined distance on the first surface 21 side of the door 2, that is, the outside, for example, within a range of about 1 to 3 m. Accordingly, the human sensor 91 detects a person when the person approaches the outside of the door 2. The detection range of the human sensor 92 is set to a predetermined distance on the second surface 22 side of the door 2, that is, a predetermined distance, for example, about 1 to 3 m. Accordingly, the human sensor 92 detects a person when the person approaches the inside of the door 2.

Thereby, the human sensors 91 and 92 detect a person when the person enters the imaging range of the imaging unit 3, and output the detection signal to the control unit 5b. The imaging range that can be imaged by the imaging unit 3 is expanded as the posture of the movable mirror 4 is changed.

The rotary switches SW1 and SW2 can be operated, for example, from the door end side end surface (front surface) of the door 2. Thereby, the user can operate the rotary switches SW1 and SW2 only when the door 2 is opened. The rotary switch SW1 is a setting switch for accepting the setting of the number of adults Na, and for example, a number of about 1 to 5 can be set. The rotary switch SW2 is a setting switch for accepting the setting of the number of children Nc, and for example, a number of about 1 to 5 can be set. Resident information indicating the number of adults and the number of children living in the residence to which the door 2 is attached is set by the rotary switches SW1 and SW2.

In this case, “adult” and “child” are classifications for roughly grasping residents from the viewpoint of body size. For example, an adult means a person with a large body, for example, about 15 years old or older. A child means a person with a small body, for example, means less than about 15 years old.

Moreover, although rotary switch SW1, SW2 was shown as an example of a resident information reception part, a resident information reception part is not restricted to a setting switch. For example, the resident information reception unit may be a wired or wireless communication interface circuit that receives the number of adults Na and the number of children Nc from an external terminal device.

FIG. 10 is an explanatory diagram for describing an imaging range changing unit that changes the imaging range along the width direction of the door. 10A shows an example in which the handle 25 is attached near the right end of the door 2, and FIG. 10B shows an example in which the handle 25 is attached near the left end of the door 2. Yes. FIG. 10 shows an example in which the imaging range 322 is only on the first surface 21 side (outside) of the door 2 and the second surface 22 is not provided in order to simplify the description.

In the example shown in FIG. 10, the imaging range changing unit 9 includes a bolt 93 inserted in the thickness direction of the door 2 from the second surface 22 side (inner side) and a metal fitting 94 attached to one end of the movable mirror 4. Has been. A nut that moves along the thickness direction of the door 2 according to the rotation of the bolt 93 is screwed to the bolt 93. The metal fitting 94 is engaged with this nut.

Thereby, when the user turns the bolt 93 with a screwdriver, the metal fitting 94 moves along the thickness direction of the door 2. As a result, the movable mirror 4 rotates in the horizontal direction, and the imaging range 322 is changed along the width direction (horizontal direction) of the door 2.

The handle 25 may be attached near the right end of the door 2 as shown in FIG. 10A, or may be attached near the left end of the door 2 as shown in FIG. 10B. Then, since the user H who tries to open the door 2 stands on the side close to the handle 25, the user H often performs iris authentication while standing at a position shifted from the center position in the width direction of the door 2. Therefore, if the imaging range 322 of the imaging unit 3 is directed from the center position in the width direction of the door 2 in the normal direction of the door 2, the user H's eyes may not enter the imaging range 322.

Also, the door 2 is once manufactured and stored or distributed as an intermediate assembly to which the handle 25 is not attached due to the custom of manufacturing and distribution. When the door 2 is actually ordered or attached to a residence, a handle 25 is attached to the right or left side of the door 2. Therefore, it is difficult to previously provide the imaging unit 3 and the first window 23 at a position close to the handle 25 at the stage of an intermediate assembly product to which the handle 25 is not attached.

On the other hand, as shown in FIG. 10, by providing the imaging range changing unit 9 that can change the direction of the imaging range 322 along the width direction of the door 2, the handle 25 is attached to the intermediate assembly at a later date, The direction of the imaging range 322 can be directed to the direction in which the handle 25 is attached. Thereby, at the stage of an intermediate assembly in which the handle 25 is not attached to either the left or right side, the imaging unit 3 or the first window is provided at the center of the door 2 in the width direction so that it can be attached to either side. 23 can be provided. Then, after the attachment position of the handle 25 is determined at a later date, as shown in FIGS. 10A and 10B, the direction of the imaging range 322 is directed to the direction in which the handle 25 is attached by the imaging range changing unit 9. By doing so, even if the handle 25 is attached to either the left or right side of the door 2, the direction of the imaging range 322 can be directed to the direction in which the user H's iris can be easily imaged.

10 shows an example in which the imaging range 322 is only on the first surface 21 side (outside) of the door 2, the imaging range 322 is also on the second surface 22 side (inside) as shown in FIG. 9. The provided structure may be sufficient. In that case, the imaging range changing unit 9 has a handle 25, for example, when the first surface 21 side (outside) is imaged and when the second surface 22 side (inside) is imaged by a motor and a gear mechanism, respectively. The movable mirror 4 may be driven so that the direction of the imaging range 322 is directed to the direction in which the camera 26 is attached.

Next, the configuration of the imaging processing unit 51b and the posture determination unit 55 and the characteristic operation of the iris authentication device 1b will be described.

The imaging processing unit 51b starts the posture changing process when a human body is detected by at least one of the human sensors 91 and 92. The posture changing process is a process of rotating the movable mirror 4 counterclockwise in FIG. 9 by rotating the motor 6, for example. Accordingly, the upper range BU1 and the lower range BD1 with respect to the outside of the door 2 and the upper range BU2 and the lower range BD2 with respect to the inside of the door 2 are scanned (scanned) in the vertical direction. ) To change. In this scanning process, the imaging range 322 is sequentially directed in a plurality of directions.

The movable mirror 4 is attached to the door 2, for example, at a height of about 140 cm from the floor surface, and the optical axis 321 is bent so as to extend horizontally at this position (hereinafter referred to as a horizontal position). The upper ranges BU1 and BU2 are above the horizontal position, and the lower ranges BD1 and BD2 are below the horizontal position.

If the horizontal position is about 140 cm from the floor, when a typical Japanese adult woman stands in front of the door 2, it will naturally take a posture of looking down at the first window 23 or the second window 24. Has been. Then, when the user standing in front of the door 2 is an adult, the probability that the user's eyes are located in the upper range BU1, BU2 is high, and when the user standing in front of the door 2 is a child, the lower range BD1, The probability that the user's eyes are located on BD2 is increased.

In the posture change process, the imaging processing unit 51b belongs to a lower time TD for directing the imaging range 322 in a direction belonging to the lower ranges BD1 and BD2, and to the upper ranges BU1 and BU2 above the lower ranges BD1 and BD2. The ratio with respect to the upper time TU in which the imaging range 322 is directed in the direction is determined based on the number of adults Na set in the rotary switch SW1 and the number of children Nc set in the rotary switch SW2.

Specifically, the imaging processing unit 51b increases the ratio of the lower time TD to the upper time TU as the ratio of the number of children Nc to the number of adults Na is higher. More specifically, the ratio between the upper time TU and the lower time TD is determined so that TD / TU = Nc / Na, and the rotation speed of the motor 6 is controlled so as to be the ratio. For example, when the ratio of the upper time TU is high, the imaging processing unit 51b decreases the rotation speed of the motor 6 when scanning the upper ranges BU1 and BU2, and when the ratio of the lower time TD is high, The rotational speed of the motor 6 when scanning the ranges BD1 and BD2 is reduced. That is, the motor 6 can change the ratio between the upper time TU and the lower time TD in accordance with the set values of the rotary switches SW1 and SW2.

In the posture changing process, the imaging processing unit 51b changes the direction of the imaging range 322 and executes imaging by the imaging unit 3 at a predetermined time interval regardless of the upper time TU and the lower time TD. . As a result, in one cycle in which the movable mirror 4 rotates once, or in one cycle in which the upper range and the lower range are scanned from end to end, increasing the ratio of the upper time TU increases the probability that an adult's eyes can be imaged. Increasing the ratio of the lower time TD increases the probability that the child's eyes can be imaged.

Each time an image is captured by the imaging unit 3, the posture determination unit 55 determines whether or not a human eye is reflected in the captured image by a known image processing technique.

When the posture determination unit 55 determines that the human eye is reflected in the image captured by the imaging unit 3, the imaging processing unit 51b stops the motor 6 and stops the imaging range 322 at that position. The posture change process is terminated. When the human eye is reflected in the image captured by the imaging unit 3, the user H's eye is in the imaging range 322. By stopping scanning in the imaging range 322 in this state, The imaging unit 3 can maintain a state in which the user H's eyes can be imaged.

In this state, the imaging processing unit 51b causes the imaging unit 3 to capture the eyes of the user H and outputs the image to the image processing unit 52. Thereafter, the image processing unit 52 and the authentication processing unit 53 perform the same image processing and iris authentication as described above.

FIG. 11 is a flowchart showing an example of the operation of the iris authentication device 1b shown in FIG. First, the imaging processing unit 51b checks whether or not a human body is detected by the human sensor 91 or the human sensor 92 (step S1). For example, when the user H stands on the first surface 21 side (outside) of the door 2, a human body is detected by the human sensor 91 (YES in step S <b> 1), and the imaging processing unit 51 b detects the adult from the rotary switches SW <b> 1 and SW <b> 2. Reading of the number of people Na and the number of children Nc is executed (step S2).

Next, the imaging processing unit 51b starts a posture change process, determines the ratio of the upper time TU and the lower time TD so that TD / TU = Nc / Na, and sets the motor so that the ratio becomes the ratio. 6 is controlled (step S3).

According to steps S1 and S3, the human body is detected by the human sensor 91 or the human sensor 92, that is, the posture changing process is started after the person stands in front of the door 2, and the motor 6 is rotated. As a result, since it is not necessary to drive the motor 6 at all times, power consumption by the motor 6 is reduced. Further, since the cumulative driving time of the motor 6 is reduced, the consumption and deterioration of the motor 6 are reduced.

Next, the imaging processing unit 51b causes the imaging unit 3 to capture an image (step S4). Next, the posture determination unit 55 determines whether the captured image captured by the imaging unit 3 includes an eye image (step S5). If the captured image does not include an eye image (NO in step S5), the user H's eyes are not in the imaging range 322. Therefore, the imaging processing unit 51b repeats the imaging and determination in steps S4 and S5 at a predetermined time interval to search for the eyes of the user H while continuing the rotation of the motor 6.

On the other hand, if the captured image includes an eye image (YES in step S5), the user H's eyes are in the imaging range 322, and the iris authentication is possible. Therefore, the imaging processing unit 51b ends the posture changing process, stops the motor 6, and causes the imaging unit 3 to capture an image (step S6).

Thereby, since the imaging by the imaging unit 3 is performed in a state where the movable mirror 4 is stopped, it becomes easy to make the captured image a clear image without blurring. Thus, by obtaining a clear captured image, the accuracy of iris authentication by the authentication processing unit 53 is improved. Further, when the human body is detected using the human sensors 91 and 92, the rotation of the motor 6 is started, and when the eyes of the user H are imaged (YES in step S5), the motor 6 is stopped. The motor 6 can be stopped during a period unnecessary for iris authentication. As a result, power consumption by the motor 6 is reduced. Further, since the cumulative driving time of the motor 6 is reduced, the consumption and deterioration of the motor 6 are reduced.

Next, an iris image is extracted by the image processing unit 52 from the captured image captured by the imaging unit 3 (step S7), and iris authentication is executed by the authentication processing unit 53 (step S8). If the authentication is successful (YES in step S9), the authentication processing unit 53 unlocks the electric lock 8 (step S10) and ends the process. On the other hand, if the authentication fails (NO in step S9), the authentication processing unit 53 ends the process without unlocking the electric lock 8. Thereby, since unlocking of the door 2 can be performed by iris authentication, the security of the door 2 can be improved.

Here, in step S3, the ratio between the upper time TU and the lower time TD is determined so that TD / TU = Nc / Na, and the rotational speed of the motor 6 is controlled so as to be the ratio. .

Then, if the family structure living in the residence to which the door 2 is attached has a large number of adults, the upper time TU is lengthened, and the time for scanning the upper ranges BU1 and BU2 corresponding to the height of the adult in one cycle. Becomes longer. In a family structure with a large number of adults, the probability of performing iris authentication to open the door 2 is higher for adults than for children. Therefore, according to step S3, when the number of adults set by the rotary switches SW1 and SW2 is larger than the number of children Nc, the upper ranges BU1 and BU2 corresponding to the height of the adult are scanned. Time is lengthened. As a result, in a family structure with a large number of adults, the opportunity to image the eyes of adults is increased, and the average waiting time until the eyes of adults are found and iris authentication is performed can be shortened. Such an average time can be shortened.

On the other hand, if the family structure living in the house to which the door 2 is attached has many children, the lower time TD is lengthened, and the lower ranges BD1 and BD2 corresponding to the height of the child's back are scanned within one cycle. The time to do becomes longer. In a family structure with a large number of children, the probability of performing iris authentication to open the door 2 is higher for children than for adults. Therefore, according to step S3, when the number of people set by the rotary switches SW1 and SW2 is larger than the number of adults Na, the lower ranges BD1 and BD2 corresponding to the height of the child are scanned. The time to do is lengthened. As a result, in a family structure with a large number of children, the opportunity to image the child's eyes is increased, and the average waiting time until the child's eyes are found and the iris authentication is performed can be shortened. Such an average time can be shortened.

In addition, although the example which performs the iris authentication of step S7, S8 using the picked-up image imaged in the state which stopped the movable mirror 4 in step S6 was shown, it does not image in step S6, but eyes in step S5. The iris authentication in steps S7 and S8 may be executed using a captured image that is determined to be included. In this way, it is possible to execute iris authentication based on the captured image in which the iris of the eye is reliably captured.

Further, although the posture determination unit 55 has shown an example in which it is determined whether or not there is a human eye in the imaging range 322 depending on whether or not the captured image has eyes, the human eye is in the imaging range 322. The method for determining whether or not there is not limited to this example. For example, it further includes a direction detecting infrared detection unit 551 that detects infrared rays emitted from the human body and has directivity in the detection direction, and the imaging processing unit 51b is adapted to change the posture of the movable mirror 4 by the motor 6, for example, The detection direction of the direction detection infrared detection unit 551 is directed in the direction of the imaging range 322 by a gear mechanism or the like interlocked with the motor 6, and the attitude determination unit 55 is based on the detection result of infrared rays by the direction detection infrared detection unit 551. It may be determined whether or not there are human eyes within the imaging range 322 of the imaging unit 3.

Normally, when a person is dressed, the parts other than the face (head) and both hands are covered with clothes. Therefore, infrared rays radiated from parts other than the face (head) and both hands are shielded by clothes. Further, since the area of the face is larger than that of the hand, infrared rays emitted from the human body have the largest amount of radiation from the face.

Therefore, when the direction detection infrared detection unit 551 detects infrared rays corresponding to infrared radiation from the human face, the direction detection infrared detection unit 551 detects the human face and the direction of the imaging range 322. It is thought that there is an eye. Therefore, it is possible to determine whether or not there is a human eye in the imaging range 322 of the imaging unit 3 based on the infrared detection result by the direction detection infrared detection unit 551. A plurality of direction detection infrared detection units 551 are used to determine whether or not there is a human eye within the imaging range 322 of the imaging unit 3 based on the amount of infrared detection obtained by each direction detection infrared detection unit 551. You may do it.

1, 1a, 1b Iris authentication device 2 Door 3 Imaging unit 4 Movable mirror (optical path bent part)
5, 5b Control unit 6 Motor (imaging direction switching unit)
8 Electric lock 9 Imaging range changing unit 21 First surface 22 Second surface 23 First window 24 Second window 25, 26 Handle 31 Imaging element 32 Optical system 33 Illuminating unit 41 First mirror (first bent portion)
42 Second mirror (second bent part)
51, 51a, 51b Imaging processing unit 52, 52a Image processing unit 53 Authentication processing unit 54 Storage unit 55 Posture determination unit 71, 72 Cold mirror 81 Rock bolt 91, 92 Human sensor (human body detection unit)
93 Bolt 94 Metal fitting 95, 96 Operation switch 97, 98 Handle sensor 231, 241 Infrared filter 321 Optical axis 322 Imaging range 411, 412, 413, 421, 422, 423 Bent part 551 Direction detection infrared detection part 711, 721 Reflection Surface 712, 722 Upper reflection surface 713, 723 Lower reflection surface A Captured image BD1, BD2 Lower range BU1, BU2 Upper range H User K1 Iris image K2 Band data K3 Inversion data Na Number of adults Nc Number of children P12, P11, P13, P23, P21, P22 Posture P1 Position P2 Center position SW1, SW2 Rotary switch (Resident information reception unit)
TD Lower time TU Upper time

Claims (26)

1. A plate-like door having a first surface and a second surface along the plate surface, the first window formed on the first surface, and the second window formed on the second surface;
   An imaging unit that captures an image and is accommodated between the first surface and the second surface of the door, and an optical axis of the optical system for the imaging extends in a direction along the plate surface;
   Between the first surface and the second surface and disposed within the imaging range of the imaging unit, the optical path for the imaging is bent in the first window direction and the second window direction And an optical path bent part that images the outside of the first window or the outside of the second window by the imaging unit,
   An iris authentication apparatus comprising: an authentication processing unit that performs iris authentication based on a captured image captured by the imaging unit.
2. An iris authentication apparatus having a first surface and a second surface along a plate surface, wherein a first window is formed on the first surface, and the second window is formed on the second surface. Because
   An imaging unit that captures an image and is accommodated between the first surface and the second surface of the door, and an optical axis of the optical system for the imaging extends in a direction along the plate surface;
   Between the first surface and the second surface and disposed within the imaging range of the imaging unit, the optical path for the imaging is bent in the first window direction and the second window direction And an optical path bent part that images the outside of the first window or the outside of the second window by the imaging unit,
   An iris authentication apparatus comprising: an authentication processing unit that performs iris authentication based on a captured image captured by the imaging unit.
3. The optical path bent portion is disposed on the optical path and is configured to be capable of changing an attitude between a first attitude that directs the optical path toward the first window and a second attitude that directs the optical path toward the second window. Movable mirror,
   The said iris authentication apparatus is further provided with the imaging direction switching part which changes the attitude | position of the said movable mirror, and makes the outside of the said 1st window or the outside of the said 2nd window image by the said imaging part. The iris authentication apparatus according to 2.
4. The iris authentication device according to claim 3, wherein the imaging direction switching unit periodically changes the posture of the movable mirror between the first posture and the second posture.
5. The door has a vertical direction that is scheduled to be arranged vertically as a fitting,
   In the first and second postures, the imaging direction switching unit is configured to direct the imaging range in a plurality of directions along the vertical direction with respect to the outside of the first window and the second window. Changing the posture of the movable mirror,
   The iris authentication device according to claim 3 or 4, wherein the imaging unit captures images in the plurality of directions with respect to the outside of the first window and the second window.
6. The optical path bent portion is disposed on the optical path, and includes a first bent portion that directs the optical path toward the first window and a second bent portion that directs the optical path toward the second window. Item 3. The iris authentication device according to item 1 or 2.
7. The door has a vertical direction that is scheduled to be arranged vertically as a fitting,
   The first bent portion and the second bent portion respectively direct the imaging range in a plurality of directions aligned along the vertical direction with respect to the outside of the first window and the second window. The iris authentication device according to claim 6, comprising a plurality of bent portions.
8. The iris authentication apparatus according to claim 6 or 7, wherein the first bent portion and the second bent portion change the direction of the optical path by a mirror or a prism.
9. The iris authentication device according to claim 5 or 7, wherein the first window and the second window are closed with a cold mirror having a plurality of reflecting surfaces extending in directions intersecting with the plurality of directions.
10. The authentication processing unit performs first authentication based on an iris image included in the photographed image, and second data based on inverted data obtained when the iris image is substantially inverted 180 degrees vertically and horizontally. The iris authentication apparatus according to any one of claims 1 to 9, wherein authentication is performed.
11. The authentication processing unit
    In the first authentication, for the ring-shaped image of the iris obtained from the captured image, the band-shaped data obtained by cutting the ring at a predetermined position and spreading both sides of the cut ring. And perform authentication based on the band data,
    In the second authentication, with respect to the ring-shaped image of the iris obtained from the photographed image, the ring is cut in the predetermined position and formed into a band-like shape so as to spread both sides of the cut ring Generate data, cut the band data at the center position in the length direction of the band, generate the inverted data by switching the positions of both the cut data and connecting them, and execute authentication based on the inverted data The iris authentication device according to claim 10.
12. The iris authentication device according to claim 10 or 11, wherein the authentication processing unit determines that the iris authentication is successful when any one of the first authentication and the second authentication is successful.
13. The authentication processing unit determines whether the authentication is successful among the first authentication and the second authentication, according to which of the first surface side and the second surface side of the door. The iris authentication apparatus according to any one of claims 10 to 12, wherein it is determined whether the authentication is for the side.
14. An iris authentication device having a first surface and a second surface along a plate surface, and attached to a plate-like door having a first window formed on the first surface,
    While capturing an image, an imaging unit accommodated between the first surface and the second surface of the door,
    Between the first surface and the second surface, disposed within the imaging range of the imaging unit, and bending the optical path for the imaging in the first window direction, thereby causing the imaging unit to An optical path bending part for imaging the outside of the first window;
    An authentication processing unit that performs iris authentication based on the captured image captured by the imaging unit;
    The door has a vertical direction that is scheduled to be arranged vertically as a fitting,
    The optical path bending unit is an iris authentication device that directs the imaging range in a plurality of directions aligned along the vertical direction with respect to the outside of the first window.
15. The optical path bending portion is a movable mirror that is arranged on the optical path and configured to be able to change its posture to a plurality of postures that direct the optical path in a plurality of directions along the vertical direction,
    The iris authentication device changes the posture of the movable mirror so that the imaging range of the movable mirror is directed in a plurality of directions along the vertical direction with respect to the outside of the first window. It further includes an imaging direction switching unit that changes the posture,
    The iris authentication apparatus according to claim 14, wherein the imaging unit captures images in the plurality of directions with respect to the outside of the first window.
16. The optical path bent portion includes a plurality of bent portions that are arranged on the optical path and direct the imaging range in a plurality of directions along the vertical direction with respect to the outside of the first window. 14. The iris authentication device according to 14.
17. The imaging direction switching unit executes an attitude change process for changing the attitude of the movable mirror so that the imaging range is sequentially directed with respect to the plurality of directions.
    The iris authentication device includes:
    An attitude determination unit that determines whether or not there is a human eye within the imaging range of the imaging unit according to a change in attitude of the movable mirror;
    The iris authentication device according to claim 5, further comprising: an imaging processing unit that stops the posture change by the imaging direction switching unit when the posture determination unit determines that the eye is within the imaging range. .
18. The imaging unit sequentially captures the images in the plurality of directions according to a change in posture of the movable mirror,
    Each time the image is captured by the imaging unit, the posture determination unit determines whether or not there is a human eye within the imaging range based on whether or not a human eye is reflected in the captured image. The iris authentication device according to claim 17.
19. A human body detection unit for detecting the location of the human body in the plurality of imaging ranges corresponding to the plurality of directions;
    The iris authentication device according to claim 17 or 18, wherein the imaging direction switching unit starts execution of the posture changing process in accordance with a human body detection result by the human body detection unit.
20. It further includes a direction detecting infrared detection unit that detects infrared rays emitted from the human body and has directivity in the detection direction,
    The imaging direction switching unit directs the detection direction to the direction of the imaging range in accordance with a change in posture of the movable mirror,
    The iris authentication apparatus according to claim 17, wherein the posture determination unit determines whether or not a human eye is within an imaging range of the imaging unit based on a detection result of the infrared by the direction detection infrared detection unit.
21. In the posture change process, the shooting direction switching unit includes a lower time for directing the imaging range in a direction belonging to a lower range preset in a lower side in the vertical direction among the plurality of directions, and the lower time The iris authentication apparatus according to any one of claims 17 to 20, wherein a ratio to an upper time for directing the imaging range in a direction belonging to an upper range above the side range is changeable.
22. A resident information receiving unit that receives resident information indicating the number of adults and the number of children residing in the residence to which the door is attached;
    The iris authentication apparatus according to claim 21, wherein the photographing direction switching unit increases the ratio of the lower time to the upper time as the ratio of the number of children to the number of adults is higher based on the resident information. .
23. The iris authentication apparatus according to any one of claims 1 to 22, further comprising an imaging range changing unit capable of changing a direction of the imaging range along a width direction of the door.
24. A handle for the user to grip is attached to the first surface of the door near the end in the width direction,
    The iris authentication apparatus according to any one of claims 1 to 23, wherein a direction of the imaging range is directed to a side on which the handle is attached with respect to a normal line direction of the first surface.
25. The iris authentication device according to any one of claims 1 to 24, further comprising the door.
26. An electric lock for locking the door;
    The iris authentication apparatus according to any one of claims 1 to 25, wherein the authentication processing unit unlocks the electric lock when authentication is successful.

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