WO2017090324A1 - Iris authentication device and iris authentication system - Google Patents

Iris authentication device and iris authentication system Download PDF

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Publication number
WO2017090324A1
WO2017090324A1 PCT/JP2016/079625 JP2016079625W WO2017090324A1 WO 2017090324 A1 WO2017090324 A1 WO 2017090324A1 JP 2016079625 W JP2016079625 W JP 2016079625W WO 2017090324 A1 WO2017090324 A1 WO 2017090324A1
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WO
WIPO (PCT)
Prior art keywords
infrared
unit
imaging
detection
detection unit
Prior art date
Application number
PCT/JP2016/079625
Other languages
French (fr)
Japanese (ja)
Inventor
楠田　達文
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日本電産リード株式会社
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Publication date
Application filed by 日本電産リード株式会社 filed Critical 日本電産リード株式会社
Publication of WO2017090324A1 publication Critical patent/WO2017090324A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing

Definitions

  • the present invention relates to an iris authentication apparatus and an iris authentication system for performing authentication by imaging an iris of a human eye.
  • 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.
  • a device that installs a camera (collator) for imaging the iris of a human eye on a wall surface next to a gate is known (see, for example, Patent Document 1). ).
  • the above-described technique has a disadvantage that it is difficult to perform iris authentication when the position of the user's eyes is not in front of the camera.
  • An object of the present invention is to provide an iris authentication device and an iris authentication system that can easily perform iris authentication even when the position of the user's eyes is not in the imaging direction of the imaging means.
  • An iris authentication apparatus includes an imaging unit that captures an image of an imaging region that is a region in a predetermined imaging direction, an infrared detection unit that detects infrared rays emitted from a human body, the imaging unit, and the infrared rays A drive unit that integrally changes the direction of the detection unit, and a drive unit that directs the imaging direction of the imaging unit by the drive unit toward a radiation source that emits the infrared rays based on the infrared rays detected by the infrared detection unit A drive control unit that executes processing, and an authentication processing unit that executes iris authentication based on a captured image captured by the imaging unit.
  • infrared rays radiated from parts other than the face (head) and both hands are shielded by clothes.
  • infrared rays emitted from the human body have the largest amount of radiation from the face. Therefore, according to this configuration, infrared rays emitted from the human body (mainly the face) are detected by the infrared detection unit, and the imaging direction of the imaging unit is directed to the direction of the infrared radiation source. As a result, even if the position of the user's eyes is not in the imaging direction of the imaging unit, the imaging direction is directed toward the user's eyes, which makes it easy to perform iris authentication.
  • the infrared detection unit has a directivity in a direction in which the infrared is detected, and a first infrared detection having a first detection region in which the infrared is detected with respect to a first detection direction according to the directivity.
  • the first infrared detecting unit are spaced apart from each other, have directivity in the direction of detecting the infrared ray, and detect the infrared ray in the second detection direction corresponding to the directivity.
  • a second infrared detection unit having two detection regions, a first overlapping region that is a partial region of the first detection region and is closer to the second infrared detection unit, and the first A second overlapping region that is a partial region of the two detection regions and is a region closer to the first infrared detection unit, and the imaging region overlaps
  • the driving unit includes the imaging direction, the imaging direction,
  • the direction of the first detection direction and the second detection direction is the first infrared direction.
  • the drive unit is integrally changed along a first separation direction, which is a direction in which the exit part and the second infrared detection part are separated from each other, and the driving process includes both detection parts of the first infrared detection part and the second infrared detection part.
  • the image pickup direction, the first detection direction, and the second detection direction may be changed by the drive unit in a direction in which the detection unit in which a stronger infrared detection intensity is obtained is arranged. preferable.
  • the image pickup direction, the first imaging direction by the drive unit in the direction in which the detection unit that has obtained a stronger detection intensity of infrared rays is arranged among the detection units of the first infrared detection unit and the second infrared detection unit.
  • One detection direction and the second detection direction are changed. Accordingly, the imaging direction is directed toward the infrared radiation source, that is, the direction of the user's face.
  • the imaging direction can be changed to the face direction, so that it is easy to perform iris authentication.
  • the imaging unit is disposed between the first infrared detection unit and the second infrared detection unit.
  • the imaging region can be provided between the first detection region and the second detection region, the direction of the user's eyes based on the infrared detection intensity by the first infrared detection unit and the second infrared detection unit The accuracy of directing the imaging direction to the is improved.
  • the imaging unit includes an imaging device that generates an image signal and an optical system that forms an image on the imaging device, and the driving unit is positioned near the tip of the optical system in the driving process. And turning the imaging unit, the first infrared detection unit, and the second infrared detection unit around a rotation axis orthogonal to the imaging direction and the first separation direction, thereby obtaining the imaging direction, the first It is preferable to change the detection direction and the second detection direction.
  • the imaging direction can be directed to the direction of the infrared radiation source without greatly changing the position of the tip of the optical system, so that the certainty of human eyes entering the imaging region is improved.
  • the drive control unit has an intensity of at least one of the infrared rays detected by the first infrared detection unit and the second infrared detection unit exceeding a predetermined determination intensity within a preset set time. It is preferable to execute the driving process when the change occurs.
  • the infrared detection unit has a directivity in a direction in which the infrared is detected, and a third infrared detection having a third detection region in which the infrared is detected in a third detection direction according to the directivity.
  • the third infrared detection unit are arranged apart from each other in the first separation direction and the second separation direction orthogonal to the imaging direction, and have directivity in the direction of detecting the infrared rays.
  • a fourth infrared detection unit having a fourth detection region in which the infrared rays are detected with respect to a fourth detection direction according to the sex, and is a partial region of the third detection region, and the fourth A third overlapping region that is a region closer to the infrared detection unit, a fourth overlapping region that is a partial region of the fourth detection region and is closer to the third infrared detection unit, and
  • the imaging region overlaps, and the driving unit further includes the imaging method.
  • the first, the second, the third, and the fourth detection direction are integrally changed along the second separation direction
  • the drive control unit further includes: Among the detection units of the third infrared detection unit and the fourth infrared detection unit, in the direction in which the detection unit having obtained a stronger infrared detection intensity is arranged, the imaging direction by the drive unit, the first, It is preferable that the second, third, and fourth detection directions are changed.
  • the imaging direction can be changed in a two-dimensional direction, even if the user's eye position is not in the imaging direction, the human face that is an infrared radiation source in a wider range is used.
  • the imaging direction can be directed to the direction, and it is easy to perform iris authentication.
  • the imaging unit is disposed between the third infrared detection unit and the fourth infrared detection unit.
  • the imaging region can be provided between the third detection region and the fourth detection region, the direction of the user's eyes based on the infrared detection intensity by the third infrared detection unit and the fourth infrared detection unit The accuracy of directing the imaging direction to the is improved.
  • an infrared illumination unit that irradiates infrared rays in the imaging direction of the imaging unit is provided, and the imaging unit captures an infrared image.
  • an iris authentication system includes the above-described iris authentication device, and a plate-like door to which the imaging unit, the infrared detection unit, and the drive unit are attached.
  • the first separation direction is preferably a direction along the vertical direction of the door.
  • the iris authentication device and the iris authentication system configured as described above can easily perform iris authentication even when the position of the user's eyes is not in the imaging direction of the imaging means.
  • FIG. 1 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. It is explanatory drawing for demonstrating the structure of the iris authentication apparatus shown in FIG. It is explanatory drawing for demonstrating the structure of the iris authentication apparatus shown in FIG. It is a block diagram which shows an example of the electrical structure of the iris authentication system shown in FIG. It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. It is a flowchart which shows an example of operation
  • FIG. 1 It is a front view which shows an example of a structure of the iris authentication device 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 a flowchart which shows an example of operation
  • FIG. 1 is a perspective view showing an example of the configuration of an iris authentication system 1 according to the first embodiment of the present invention.
  • An iris authentication system 1 shown in FIG. 1 includes a door 2, an iris authentication device 3, and an electric lock 8.
  • the iris authentication device 3 and the electric lock 8 are accommodated within the thickness of the door 2.
  • the door 2 has a substantially rectangular plate shape, and is attached to the building such that its longitudinal direction is the vertical direction along the vertical direction, and the width direction of the door 2 is the left-right direction (horizontal 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 vertical direction, for example, at the height of the line of sight of a person of average height. ing.
  • the window 27 is, for example, a glass window.
  • the iris authentication device 3 illustrated in FIG. 2 includes an imaging module 9 and a drive unit 7.
  • the imaging module 9 includes an imaging unit 4, a first infrared detection unit 51, a second infrared detection unit 52, an infrared illumination unit 6, and a substrate 31 to which these are attached.
  • the imaging unit 4 includes an imaging element 42 that generates an image signal, an optical system 43 that forms an image on the imaging element 42, a cylindrical barrel 41 that houses the imaging element 42 and the optical system 43, and visible light And an optical filter 44 for blocking or reducing incidence on the optical system 43.
  • the optical system 43 is configured, for example, by arranging one or a plurality of lenses in the lens barrel 41, and an image in the imaging region 433 in the imaging direction 432 in which the optical axis 431 is extended is arranged on the rear end side of the optical system 43.
  • the image is formed on the image pickup element 42 thus formed. Since the optical filter 44 is disposed in front of the optical system 43 and the incidence of visible light on the optical system 43 is blocked or reduced, the optical system 43 can capture an infrared image obtained by removing visible light from the imaging device. 42 is imaged.
  • the imaging direction 432 is directed outward from the window 27 of the door 2 shown in FIG.
  • the image sensor 42 converts an image formed by the optical system 43, that is, an infrared image in the imaging region 433 into an image signal, and transmits the image signal to the control unit 100 described later as a captured image.
  • the image sensor 42 is an image sensor such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor).
  • the infrared illumination unit 6 irradiates, for example, infrared light having a wavelength of about 850 nm in the imaging direction 432 of the imaging unit 4, that is, outward from the window 27 of the door 2 illustrated in FIG. 1.
  • the infrared illumination unit 6 is configured using, for example, an infrared LED (Light Emitting Diode).
  • an infrared LED Light Emitting Diode
  • the infrared illumination unit 6 is not limited to the example provided on the upper side of the imaging unit 4 as long as it can illuminate the eyes of the person who is going to authenticate. It may be disposed below, right, or left of the imaging unit 4, and may be disposed on both the upper and lower sides and / or the left and right sides of the imaging unit 4. Further, instead of the infrared illumination unit 6, an illumination unit that irradiates visible light may be provided, the optical filter 44 may not be provided, and the imaging unit 4 may be configured to capture an image of visible light. Moreover, it is good also as a structure which does not provide an illumination part but images an iris image with natural light.
  • the first infrared detection unit 51 and the second infrared detection unit 52 are infrared sensors that detect infrared rays emitted from the human body, for example, infrared rays having a wavelength of about 10 ⁇ m.
  • the first infrared detector 51 outputs a first infrared intensity SG1 that is a signal indicating the intensity of the detected infrared.
  • the second infrared detector 52 outputs a second infrared intensity SG2, which is a signal indicating the detected infrared intensity.
  • the first infrared detection unit 51 has directivity in the direction in which infrared is detected, and has a first detection region 512 in which infrared is detected with respect to the first detection direction 511 corresponding to the directivity.
  • the second infrared detection unit 52 is arranged so as to be separated from the first infrared detection unit 51 in the vertical direction (first separation direction) and to sandwich the imaging unit 4 with the first infrared detection unit 51. Yes.
  • the 2nd infrared detection part 52 has directivity in the direction which detects infrared rays, and has the 2nd detection area
  • the imaging direction 432, the first detection direction 511, and the second detection direction 521 are substantially parallel to each other. It should be noted that the angle formed by the first detection direction 511 with respect to the imaging direction 432 and the angle formed by the second detection direction 521 with respect to the imaging direction 432 may be substantially equal, and the imaging direction 432, the first detection direction 511, The second detection direction 521 is not limited to being substantially parallel.
  • a part of the first detection region 512 and the side close to the second infrared detection unit 52 is a first overlap region 513.
  • a part of the second detection region 522 that is close to the first infrared detection unit 51 is a second overlapping region 523.
  • the first overlapping region 513, the second overlapping region 523, and the imaging region 433 partially overlap each other.
  • the substrate 31 is provided with a protruding portion 311 that protrudes in a direction opposite to the imaging direction 432.
  • the imaging module 9 is positioned around the tip of the optical system 43 and is rotatable about a rotation axis 312 that is orthogonal to the imaging direction 432 and extends in the horizontal direction.
  • the vicinity of the tip of the optical system means the vicinity of the most distal end portion of the members constituting the optical system for imaging, for example, a position within 10 mm from the distal end portion.
  • the position is within, for example, 10 mm from the tip of the lens barrel 41.
  • the optical system that does not include the lens barrel for example, 10 mm from the tip of the optical component provided on the most distal side. The position is within.
  • the drive unit 7 includes, for example, a motor 71, a screw shaft 72, and a nut 73.
  • the nut 73 is attached to the protruding portion 311.
  • a ball is inserted between the screw shaft 72 and the nut 73, and a ball screw is formed by the screw shaft 72 and the nut 73.
  • the motor 71 rotates the screw shaft 72.
  • the nut 73 moves along the screw shaft 72 as the screw shaft 72 rotates, and the substrate 31 rotates around the rotation shaft 312.
  • the nut 73 and the motor 71 can be appropriately rotated and moved so as not to prevent the rotation of the substrate 31.
  • the imaging unit 4, the first infrared detection unit 51, the second infrared detection unit 52, and the infrared illumination unit 6 are attached to the substrate 31, the imaging unit 4, the first infrared detection unit 51, and the second infrared detection.
  • the unit 52 and the infrared illumination unit 6 change the direction together with the substrate 31. Thereby, according to rotation of the motor 71, the direction of the imaging direction 432, the 1st detection direction 511, and the 2nd detection direction 521 is changed integrally along an up-down direction. Further, the upward movement and the downward movement can be switched according to the rotation direction of the motor 71.
  • the directions of the imaging direction 432, the first detection direction 511, and the second detection direction 521 are referred to as the orientation of the imaging module 9.
  • the drive part 7 can change the direction of the imaging direction 432, the 1st detection direction 511, and the 2nd detection direction 521, ie, the direction of the imaging module 9, along the up-down direction (1st separation direction).
  • the imaging module 9 may be driven using a gear, a rack and pinion, or a driving device such as a solenoid, a linear motor, or an air cylinder may be used.
  • FIG. 4 is a block diagram showing an example of the electrical configuration of the iris authentication system 1 shown in FIG.
  • a first infrared detection unit 51, a second infrared detection unit 52, an image sensor 42, an infrared illumination unit 6, a drive unit 7, and an electric lock 8 are connected to the control unit 100. It is configured.
  • the control unit 100 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a RAM (Random Access Memory) that temporarily stores data, a flash memory that stores predetermined control programs and data, and an EEPROM (Electrically A non-volatile storage unit such as Erasable Programmable Read-Only Memory, and peripheral circuits thereof are configured.
  • the storage unit described above is also used as a storage unit 105 in which authentication reference data such as an iris image of a user who can be authenticated or feature data obtained from an iris image is stored in advance.
  • the control unit 100 functions as a drive control unit 101, an imaging control unit 102, an image processing unit 103, and an authentication processing unit 104 by executing a predetermined control program.
  • control unit 100 is not necessarily limited to the example of being housed in the door 2.
  • the control unit 100 may be provided outside the door 2 and connected to the door 2 by a cable or wireless communication means.
  • the structure by which a part of control part 100, for example, the authentication process part 104, is provided in the exterior of the door 2 may be sufficient.
  • all or part of the control unit 100 may be configured by a dedicated IC (Integrated Circuit) such as an ASIC (application specific integrated circuit), or may be configured by a circuit element such as an operational amplifier or a comparator.
  • the drive control unit 101 Based on the infrared rays detected by the first infrared detection unit 51 and the second infrared detection unit 52, the drive control unit 101 causes the drive unit 7 to change the direction of the imaging module 9 to a radiation source (human face) that emits infrared rays. ) Is executed to be directed in the direction of). Specifically, the driving process is performed in the direction in which the detection unit that has obtained a stronger infrared detection intensity is disposed, of the first infrared detection unit 51 and the second infrared detection unit 52. 7 changes the orientation of the imaging module 9.
  • the drive control unit 101 may be configured by, for example, a differential amplifier circuit using an operational amplifier, a comparator, or the like, and various configurations can be adopted as the drive control unit 101.
  • the imaging module 9 rotates around the rotation axis 312, and the imaging unit 4, the first infrared detection unit 51, and the second infrared detection unit 52 rotate around the rotation axis 312, thereby causing an imaging direction 432.
  • the first detection direction 511 and the second detection direction 521 are changed.
  • the drive control unit 101 The drive of the imaging module 9 by the drive unit 7 is stopped, and a drive end signal indicating the end of the drive process is output to the imaging control unit 102.
  • the reference value M a value corresponding to a variation or error in the infrared detection accuracy of the first infrared detection unit 51 and the second infrared detection unit 52 is set in advance.
  • the imaging module 9 is directed toward the face where the infrared radiation intensity is strong.
  • the imaging direction 432 of the imaging unit 4 is directed toward the human face, the human eye enters the imaging region 433.
  • the human iris can be imaged by the imaging unit 4, and iris authentication is performed. Can be executed.
  • At least one of the first infrared intensity SG ⁇ b> 1 and the second infrared intensity SG ⁇ b> 2 detected by the first infrared detection unit 51 and the second infrared detection unit 52 is set in advance within a preset set time t.
  • the drive process described above is executed when the determination intensity changes beyond the set determination intensity k, that is, when the infrared intensity changes differentially.
  • the set time t and the determination intensity k are the change speed and the change of the first infrared intensity SG1 and the second infrared intensity SG2 that occur when a person enters or exits the first detection area 512 or the second detection area 522.
  • the amount is determined in advance by, for example, experimental determination.
  • the imaging control unit 102 turns on the infrared illumination unit 6 to illuminate the eyes of the person to be authenticated, and causes the imaging unit 4 to capture an image of the eyes. Thereafter, the infrared illumination unit 6 is turned off.
  • the image processing unit 103 extracts an iris image from the image captured by the imaging unit 4 using a known image recognition technique, and outputs the iris image to the authentication processing unit 104.
  • the authentication processing unit 104 performs iris authentication by a known iris authentication technique based on the iris image sent from the image processing unit 103. Specifically, the authentication processing unit 104 uses an iris image sent from the image processing unit 103 or feature data obtained from the image as an iris image or feature data stored in the storage unit 105. Iris authentication is performed by comparing with. The authentication processing unit 104 unlocks the electric lock 8 when the authentication is successful. Thereby, a user who has succeeded in authentication can open the door 2.
  • the iris authentication system 1 performs iris authentication by imaging the iris of a person standing in front of the door 2. At this time, the height of the eyes varies depending on the height difference between children, adults, and others.
  • the faces F1 and F2 illustrated in FIG. 5 are located at a position lower than the imaging area 433, and the faces F3 and F4 are located at a position higher than the imaging area 433.
  • the imaging part 4 can image only part of the faces F1 and F3, and cannot image the faces F2 and F4 at all. Therefore, the iris authentication system 1 cannot capture the eyes of the faces F1 to F4 as it is, and cannot perform iris authentication.
  • the drive control unit 101 performs iris authentication by allowing the imaging unit 4 to image the human iris toward the human face, which is an infrared emission source, by directing the imaging direction 432 of the imaging unit 4. It is supposed to be executable.
  • FIG. 8 is a flowchart showing an example of the operation of the iris authentication system 1 shown in FIG.
  • the drive control unit 101 determines that at least one of the first infrared intensity SG1 and the second infrared intensity SG2 detected by the first infrared detection unit 51 and the second infrared detection unit 52 is within the set time t. Is changed (YES in step S1), that is, when it is considered that a person has entered or exited the first detection area 512 or the second detection area 522, the driving process of steps S2 to S5 is executed. Accordingly, for example, the driving process is not performed on an object that has been warmed up by the sun and the temperature has risen slowly, and thus the imaging module 9 may be directed toward an object other than the human face. Reduced.
  • step S2 the drive control unit 101 compares the second infrared intensity SG2 with a value (SG1 + M) obtained by adding the reference value M to the first infrared intensity SG1 (step S2), and the second infrared intensity SG2 is (SG1 + M). ) If it is stronger (YES in step S2), the image pickup module 9 is directed downward by the drive unit 7 (step S3), and step S2 is repeated again.
  • the face F2 shown in FIG. 5 is entirely outside the first detection area 512 and entirely inside the second detection area 522, so the second infrared intensity SG2 is sufficiently larger than the first infrared intensity SG1.
  • SG2 becomes stronger than (SG1 + M) (YES in step S2), and the imaging module 9 is directed downward as shown in FIG. 6 (step S3).
  • the face F ⁇ b> 1 is included in both the first detection area 512 and the second detection area 522, but the range of the face that is included in the second detection area 522 rather than the first detection area 512 ( Therefore, the second infrared intensity SG2 is sufficiently larger than the first infrared intensity SG1, and the imaging module 9 is directed downward.
  • the drive control unit 101 causes the drive unit 7 to point the imaging module 9 upward (Step S5), and Step S2 and subsequent steps are performed again. Repeated.
  • the face F4 shown in FIG. 5 is in the first detection region 512 and entirely outside the second detection region 522, so that the first infrared intensity SG1 is sufficiently higher than the second infrared intensity SG2.
  • SG1 becomes stronger than (SG2 + M) (YES in step S4), and the imaging module 9 is directed upward as shown in FIG. 7 (step S5).
  • the face F ⁇ b> 3 is in both the first detection area 512 and the second detection area 522, but the range of the face that is in the first detection area 512 rather than the second detection area 522 ( Therefore, the first infrared intensity SG1 is sufficiently larger than the second infrared intensity SG2, and the imaging module 9 is directed upward.
  • the difference between the first infrared intensity SG1 and the second infrared intensity SG2 is equal to or less than the reference value M (M ⁇
  • M M ⁇
  • the image pickup module 9 is held in this direction in the vertical direction.
  • the face F2 or the face F4 enters the area where the first detection area 512 and the second detection area 522 overlap, and the face area in the first detection area 512 This means that the areas of the faces in the two detection areas 522 are substantially equal.
  • the face F2 or the face F4 enters the imaging region 433, and the imaging unit 4 The eye can be imaged.
  • the imaging module 9 can be directed toward the user's eye, so that it is easy to perform iris authentication.
  • the imaging control unit 102 turns on the infrared illumination unit 6 to illuminate the imaging region 433 with infrared rays (step S6), causes the imaging unit 4 to perform imaging of the imaging region 433 (step S7), and infrared illumination unit 6 is turned off (step S8).
  • the infrared illumination unit 6 is turned off (step S8).
  • the image processing unit 103 extracts an iris image from the captured image captured by the imaging unit 4, and outputs the extracted iris image to the authentication processing unit 104 (step S9).
  • the authentication processing unit 104 performs iris authentication based on the iris image sent from the image processing unit 103 (step S10). If the authentication is successful (YES in step S11), the authentication processing unit 104 unlocks the electric lock 8 (step S12). Thereby, a user who has succeeded in authentication can open the door 2. On the other hand, when the authentication fails (NO in step S11), the authentication processing unit 104 ends the process while keeping the electric lock 8 locked. Thereby, since only the authorized user registered in advance can open the door 2, security is ensured.
  • the imaging module 9 is not mistakenly directed to anything other than the human body.
  • the configuration may not be executed.
  • the reference value M is not necessarily used, and the reference value M may be zero.
  • the iris authentication system 1 is not limited to performing the iris authentication in order to unlock the door, and may be configured not to execute step S12.
  • the infrared detection part should just be able to detect the discharge
  • the iris authentication apparatus 3 is not necessarily limited to the example attached to the door 2, and the first separation direction may not necessarily be the vertical direction.
  • the first separation direction may be a horizontal direction or any other direction.
  • FIG. 9 is a front view showing an example of the configuration of the iris authentication device 3a according to the second embodiment of the present invention.
  • FIG. 10 is a block diagram showing an example of the electrical configuration of the iris authentication device 3a shown in FIG.
  • the iris authentication apparatus 3a shown in FIG. 9 accommodates the imaging module 9a, the vertical drive unit 7a (drive unit) configured similarly to the drive unit 7, and the left and right drive unit 7b (drive unit).
  • the imaging module 9a the vertical drive unit 7a (drive unit) configured similarly to the drive unit 7, and the left and right drive unit 7b (drive unit).
  • a transparent spherical housing 10 and a stand 11 that supports the housing 10 are provided.
  • the imaging module 9 a is further provided with a third infrared detection unit 53 and a fourth infrared detection unit 54 in addition to the configuration of the imaging module 9.
  • a third infrared detection unit 53 and a fourth infrared detection unit 54 are disposed apart from each other in the left-right direction (second separation direction) with the imaging unit 4 interposed therebetween.
  • the front side of the drawing is the imaging direction 432.
  • the third infrared detection unit 53 is configured in the same manner as the first infrared detection unit 51, and outputs a signal indicating the detected infrared intensity to the control unit 100a as the third infrared intensity SG3.
  • the fourth infrared detecting unit 54 is configured in the same manner as the second infrared detecting unit 52, and outputs a signal indicating the detected infrared intensity as the fourth infrared intensity SG4 to the control unit 100a.
  • the third infrared detection unit 53, the imaging unit 4, and the fourth infrared detection unit 54 rotate the first infrared detection unit 51, the imaging unit 4, and the second infrared detection unit 52 by 90 degrees around the optical axis 431. It is arrange
  • the fourth infrared detection unit 54 includes a fourth detection direction, a fourth detection region, and a fourth overlap corresponding to the second detection direction 521, the second detection region 522, and the second overlap region 523 of the second infrared detection unit 52. Has an area.
  • the third overlapping region, the fourth overlapping region, and the imaging region 433 are arranged so that parts thereof overlap each other.
  • the infrared illumination unit 6, the first infrared detection unit 51, the second infrared detection unit 52, the third infrared detection unit 53, the fourth infrared detection unit 54, and the imaging unit 4 are integrally held by a substantially plate-shaped substrate 31a.
  • the imaging module 9a is configured.
  • the first detection direction 511, the second detection direction 521, the third detection direction, the fourth detection direction, and the imaging direction 432 are collectively referred to as the direction of the imaging module 9a.
  • the imaging module 9 a faces the front side of the page.
  • the vertical drive unit 7a is configured in the same manner as the drive unit 7, changes the orientation of the imaging module 9a along the vertical direction, and the left and right drive unit 7b has the same configuration as when the drive unit 7 is rotated by 90 degrees, for example.
  • the direction of the imaging module 9a is changed along the left-right direction (horizontal direction).
  • the control unit 100a is different in that it includes a vertical drive control unit 101V and a left / right drive control unit 101H as drive control units.
  • the vertical drive control unit 101V is configured similarly to the drive control unit 101, and controls the operation of the vertical drive unit 7a instead of the drive unit 7.
  • the left and right drive control unit 101H differs from the drive control unit 101 based on the third infrared intensity SG3 and the fourth infrared intensity SG4 instead of controlling the drive unit 7 based on the first infrared intensity SG1 and the second infrared intensity SG2. The difference is that the drive unit 7b is controlled.
  • FIG. 11 is a flowchart showing an example of the operation of the iris authentication device 3a shown in FIG.
  • the vertical drive control unit 101V or the left / right drive control unit 101H has at least one of the first infrared intensity SG1, the second infrared intensity SG2, the third infrared intensity SG3, and the fourth infrared intensity SG4 within the set time t. If it has changed beyond the determination strength k (YES in step S1a), the drive processing of steps S2 to S5 and steps S21 to S24 is executed. Accordingly, for example, the driving process is not performed on an object that has been warmed up by the sun and the temperature has risen slowly, and thus the imaging module 9 may be directed toward an object other than the human face. Reduced.
  • Steps S2 to S5 are the same as those in FIG. 8 except that the vertical drive control unit 101V executes the process instead of the drive control unit 101, and thus the description thereof is omitted.
  • the left and right drive control unit 101H compares the fourth infrared intensity SG4 with a value (SG3 + M) obtained by adding the reference value M to the third infrared intensity SG3 (step S21), and the fourth infrared intensity SG4 is ( If it is stronger than (SG3 + M) (YES in step S21), the left and right drive unit 7b causes the imaging module 9 to point to the right (step S22) and repeats step S2 and subsequent steps again.
  • the imaging area 433 is directed toward the face.
  • the left and right drive control unit 101H adds the reference value M to the third infrared intensity SG3 and the fourth infrared intensity SG4 (SG4 + M ) (Step S23), and if the third infrared intensity SG3 is stronger than (SG4 + M) (YES in step S23), the left and right drive unit 7b causes the imaging module 9 to point left (step S24), and then step again Repeat from S2.
  • the imaging area 433 is directed in the direction of the face.
  • the third infrared intensity SG3 is (SG4 + M) or less (NO in step S23)
  • the difference between the third infrared intensity SG3 and the fourth infrared intensity SG4 is equal to or less than the reference value M (M ⁇
  • the iris authentication device 3a performs the iris authentication by changing the imaging direction 432 not only in the vertical direction but also in the horizontal direction by the processing of steps S2 to S5, steps S21 to S24, and steps S6 to S11. Can do.

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Abstract

[Problem] To provide an iris authentication device and an iris authentication system with which it is easy to perform iris authentication even when the positions of a user's eyes are not in the imaging direction of an imaging means. [Solution] The present invention is provided with: an imaging unit for capturing the image of an imaging area that is an area in the direction of imaging; a first infrared detection unit and a second infrared detection unit for detecting an infrared ray radiated from a human face; a drive unit for making the directions of the imaging unit, the first infrared detection unit, and the second infrared detection unit changed en bloc; a drive control unit for executing a drive process for making the imaging direction of the imaging unit turned by the drive unit to the direction of the face that radiates an infrared ray, on the basis of an infrared ray detected by the first infrared detection unit and the second infrared detection unit; and an authentication processing unit for executing iris authentication on the basis of the captured image acquired by the imaging unit.

Description

虹彩認証装置、及び虹彩認証システムIris authentication device and iris authentication system
　本発明は、人の目の虹彩を撮像することにより認証をおこなう虹彩認証装置、及び虹彩認証システムに関する。 The present invention relates to an iris authentication apparatus and an iris authentication system for performing authentication by imaging an iris of a human eye.
　従来より、人の目の虹彩を撮像することにより認証をおこなう虹彩認証が知られている。虹彩認証は、例えば部屋や建物等、セキュリティを確保する必要のあるエリアに対する人の出入りを管理するために用いられている。このような虹彩認証を行う虹彩認証装置として、ゲート横の壁面に、人の目の虹彩を撮像するためのカメラ（照合機）を設置するものが知られている（例えば、特許文献１参照。）。 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. As an iris authentication apparatus that performs such iris authentication, a device that installs a camera (collator) for imaging the iris of a human eye on a wall surface next to a gate is known (see, for example, Patent Document 1). ).
特開２００１－１１８１０３号公報JP 2001-118103 A
　しかしながら、上述の技術では、虹彩撮影用のカメラを標準的な大人の目の高さに設置すると、例えば、子供などの背の低い人や、標準より背の高い人の場合、カメラに自分の目を正対させることが困難となり、虹彩認証を行うことが難しくなる。このように、上述の技術では、ユーザの目の位置がカメラの正面になかった場合には、虹彩認証を行うことが困難であるという不都合があった。 However, in the above-described technology, when an iris camera is installed at a standard adult eye level, for example, in the case of a short person such as a child or a person taller than the standard, It becomes difficult to face the eyes, and it is difficult to perform iris authentication. Thus, the above-described technique has a disadvantage that it is difficult to perform iris authentication when the position of the user's eyes is not in front of the camera.
　本発明の目的は、ユーザの目の位置が撮影手段の撮像方向にない場合であっても、虹彩認証を行うことが容易な虹彩認証装置、及び虹彩認証システムを提供することである。 An object of the present invention is to provide an iris authentication device and an iris authentication system that can easily perform iris authentication even when the position of the user's eyes is not in the imaging direction of the imaging means.
　本発明の一局面に従う虹彩認証装置は、所定の撮像方向の領域である撮像領域の画像を撮像する撮像部と、人体から放射される赤外線を検出する赤外線検出部と、前記撮像部及び前記赤外線検出部の向きを一体に変化させる駆動部と、前記赤外線検出部により検出された赤外線に基づいて前記赤外線を放射する放射源の方向へ、前記駆動部によって前記撮像部の撮像方向を向けさせる駆動処理を実行する駆動制御部と、前記撮像部によって撮像された撮影画像に基づき、虹彩認証を実行する認証処理部とを備える。 An iris authentication apparatus according to an aspect of the present invention includes an imaging unit that captures an image of an imaging region that is a region in a predetermined imaging direction, an infrared detection unit that detects infrared rays emitted from a human body, the imaging unit, and the infrared rays A drive unit that integrally changes the direction of the detection unit, and a drive unit that directs the imaging direction of the imaging unit by the drive unit toward a radiation source that emits the infrared rays based on the infrared rays detected by the infrared detection unit A drive control unit that executes processing, and an authentication processing unit that executes iris authentication based on a captured image captured by the imaging unit.
　通常、人が服を着た状態では、顔（頭部）と両手以外の部分は服で被われている。そのため、顔（頭部）と両手以外の部分から放射される赤外線は服で遮蔽される。また、手よりも顔の面積の方が大きいので、人体から放射される赤外線は、顔からの放射量が最も多くなる。そこで、この構成によれば、赤外線検出部によって人体（主に顔）から放射される赤外線が検出され、その赤外線の放射源の方向へ、撮像部の撮像方向が向けられる。その結果、ユーザの目の位置が撮像部の撮像方向にない場合であっても、ユーザの目の方向へ撮像方向が向けられるので、虹彩認証を行うことが容易となる。 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, according to this configuration, infrared rays emitted from the human body (mainly the face) are detected by the infrared detection unit, and the imaging direction of the imaging unit is directed to the direction of the infrared radiation source. As a result, even if the position of the user's eyes is not in the imaging direction of the imaging unit, the imaging direction is directed toward the user's eyes, which makes it easy to perform iris authentication.
　また、前記赤外線検出部は、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第一検出方向に対して前記赤外線が検出される第一検出領域を有する第一赤外線検出部と、前記第一赤外線検出部とは離間して配置され、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第二検出方向に対して前記赤外線が検出される第二検出領域を有する第二赤外線検出部とを含み、前記第一検出領域の一部の領域であって、かつ前記第二赤外線検出部に近い側の領域である第一重複領域と、前記第二検出領域の一部の領域であって、かつ前記第一赤外線検出部に近い側の領域である第二重複領域と、前記撮像領域とが重複し、前記駆動部は、前記撮像方向、前記第一検出方向、及び前記第二検出方向の向きを、前記第一赤外線検出部と前記第二赤外線検出部とが離間する方向である第一離間方向に沿って一体に変化させ、前記駆動処理は、前記第一赤外線検出部及び前記第二赤外線検出部の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、前記駆動部によって前記撮像方向、前記第一検出方向、及び前記第二検出方向を変化させる処理であることが好ましい。 In addition, the infrared detection unit has a directivity in a direction in which the infrared is detected, and a first infrared detection having a first detection region in which the infrared is detected with respect to a first detection direction according to the directivity. And the first infrared detecting unit are spaced apart from each other, have directivity in the direction of detecting the infrared ray, and detect the infrared ray in the second detection direction corresponding to the directivity. A second infrared detection unit having two detection regions, a first overlapping region that is a partial region of the first detection region and is closer to the second infrared detection unit, and the first A second overlapping region that is a partial region of the two detection regions and is a region closer to the first infrared detection unit, and the imaging region overlaps, and the driving unit includes the imaging direction, the imaging direction, The direction of the first detection direction and the second detection direction is the first infrared direction. The drive unit is integrally changed along a first separation direction, which is a direction in which the exit part and the second infrared detection part are separated from each other, and the driving process includes both detection parts of the first infrared detection part and the second infrared detection part. Among these, the image pickup direction, the first detection direction, and the second detection direction may be changed by the drive unit in a direction in which the detection unit in which a stronger infrared detection intensity is obtained is arranged. preferable.
　この構成によれば、第一赤外線検出部及び第二赤外線検出部の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、駆動部によって撮像方向、第一検出方向、及び第二検出方向が変化される。従って、赤外線の放射源、すなわちユーザの顔の方向へ、撮像方向が向けられる。その結果、ユーザの目の位置が撮影手段の撮像方向にない場合であっても、顔の方向へ撮像方向を変化させることができるので、虹彩認証を行うことが容易である。 According to this configuration, the image pickup direction, the first imaging direction by the drive unit in the direction in which the detection unit that has obtained a stronger detection intensity of infrared rays is arranged among the detection units of the first infrared detection unit and the second infrared detection unit. One detection direction and the second detection direction are changed. Accordingly, the imaging direction is directed toward the infrared radiation source, that is, the direction of the user's face. As a result, even when the user's eye position is not in the imaging direction of the imaging means, the imaging direction can be changed to the face direction, so that it is easy to perform iris authentication.
　また、前記撮像部は、前記第一赤外線検出部と前記第二赤外線検出部との間に配置されていることが好ましい。 Further, it is preferable that the imaging unit is disposed between the first infrared detection unit and the second infrared detection unit.
　この構成によれば、第一検出領域と第二検出領域との間に撮影領域を設けることができるので、第一赤外線検出部及び第二赤外線検出部による赤外線検出強度に基づきユーザの目の方向へ撮像方向を向ける精度が向上する。 According to this configuration, since the imaging region can be provided between the first detection region and the second detection region, the direction of the user's eyes based on the infrared detection intensity by the first infrared detection unit and the second infrared detection unit The accuracy of directing the imaging direction to the is improved.
　また、前記撮像部は、画像信号を生成する撮像素子と、前記撮像素子に画像を結像する光学系とを含み、前記駆動部は、前記駆動処理において、前記光学系の先端近傍に位置すると共に前記撮像方向及び前記第一離間方向に対して直交する回転軸回りに前記撮像部、前記第一赤外線検出部、及び前記第二赤外線検出部を旋回させることにより、前記撮像方向、前記第一検出方向、及び前記第二検出方向を変化させることが好ましい。 In addition, the imaging unit includes an imaging device that generates an image signal and an optical system that forms an image on the imaging device, and the driving unit is positioned near the tip of the optical system in the driving process. And turning the imaging unit, the first infrared detection unit, and the second infrared detection unit around a rotation axis orthogonal to the imaging direction and the first separation direction, thereby obtaining the imaging direction, the first It is preferable to change the detection direction and the second detection direction.
　この構成によれば、光学系の先端の位置を大きく変化させることなく撮像方向を赤外線の放射源の方向へ向けることができるので、人の目が撮像領域に入る確実性が向上する。 According to this configuration, the imaging direction can be directed to the direction of the infrared radiation source without greatly changing the position of the tip of the optical system, so that the certainty of human eyes entering the imaging region is improved.
　また、前記駆動制御部は、前記第一赤外線検出部及び前記第二赤外線検出部で検出された赤外線のうち少なくとも一方の強度が、予め設定された設定時間内に予め設定された判定強度を超えて変化した場合に前記駆動処理を実行することが好ましい。 Further, the drive control unit has an intensity of at least one of the infrared rays detected by the first infrared detection unit and the second infrared detection unit exceeding a predetermined determination intensity within a preset set time. It is preferable to execute the driving process when the change occurs.
　この構成によれば、例えば日光によりゆっくり暖められて赤外線が生じた場合のような、人以外から放射される赤外線の放射源の方向に誤って撮像方向を変化させるおそれが低減される。 According to this configuration, the possibility that the imaging direction is erroneously changed to the direction of an infrared radiation source emitted from a person other than a person, such as when infrared rays are generated by being slowly warmed by sunlight, is reduced.
　また、前記赤外線検出部は、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第三検出方向に対して前記赤外線が検出される第三検出領域を有する第三赤外線検出部と、前記第三赤外線検出部とは、前記第一離間方向及び前記撮像方向と直交する第二離間方向に離間して配置され、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第四検出方向に対して前記赤外線が検出される第四検出領域を有する第四赤外線検出部とを含み、前記第三検出領域の一部の領域であって、かつ前記第四赤外線検出部に近い側の領域である第三重複領域と、前記第四検出領域の一部の領域であって、かつ前記第三赤外線検出部に近い側の領域である第四重複領域と、前記撮像領域とが重複し、前記駆動部は、さらに、前記撮像方向、前記第一、前記第二、前記第三、及び前記第四検出方向の向きを、前記第二離間方向に沿って一体に変化させ、前記駆動制御部は、前記駆動処理において、さらに、前記第三赤外線検出部及び前記第四赤外線検出部の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、前記駆動部によって前記撮像方向、前記第一、前記第二、前記第三、及び前記第四検出方向を変化させることが好ましい。 In addition, the infrared detection unit has a directivity in a direction in which the infrared is detected, and a third infrared detection having a third detection region in which the infrared is detected in a third detection direction according to the directivity. And the third infrared detection unit are arranged apart from each other in the first separation direction and the second separation direction orthogonal to the imaging direction, and have directivity in the direction of detecting the infrared rays. A fourth infrared detection unit having a fourth detection region in which the infrared rays are detected with respect to a fourth detection direction according to the sex, and is a partial region of the third detection region, and the fourth A third overlapping region that is a region closer to the infrared detection unit, a fourth overlapping region that is a partial region of the fourth detection region and is closer to the third infrared detection unit, and The imaging region overlaps, and the driving unit further includes the imaging method. , The first, the second, the third, and the fourth detection direction are integrally changed along the second separation direction, and the drive control unit further includes: Among the detection units of the third infrared detection unit and the fourth infrared detection unit, in the direction in which the detection unit having obtained a stronger infrared detection intensity is arranged, the imaging direction by the drive unit, the first, It is preferable that the second, third, and fourth detection directions are changed.
　この構成によれば、二次元方向に撮像方向を変化させることができるので、ユーザの目の位置が撮像方向にない場合であっても、より広い範囲で赤外線の放射源となる人の顔の方向へ撮像方向を向けることが可能となり、虹彩認証を行うことが容易となる。 According to this configuration, since the imaging direction can be changed in a two-dimensional direction, even if the user's eye position is not in the imaging direction, the human face that is an infrared radiation source in a wider range is used. The imaging direction can be directed to the direction, and it is easy to perform iris authentication.
　また、前記撮像部は、前記第三赤外線検出部と前記第四赤外線検出部との間に配置されていることが好ましい。 Further, it is preferable that the imaging unit is disposed between the third infrared detection unit and the fourth infrared detection unit.
　この構成によれば、第三検出領域と第四検出領域との間に撮影領域を設けることができるので、第三赤外線検出部及び第四赤外線検出部による赤外線検出強度に基づきユーザの目の方向へ撮像方向を向ける精度が向上する。 According to this configuration, since the imaging region can be provided between the third detection region and the fourth detection region, the direction of the user's eyes based on the infrared detection intensity by the third infrared detection unit and the fourth infrared detection unit The accuracy of directing the imaging direction to the is improved.
　また、前記撮像部の前記撮像方向へ赤外線を照射する赤外線照明部をさらに備え、前記撮像部は、赤外線画像を撮像することが好ましい。 Further, it is preferable that an infrared illumination unit that irradiates infrared rays in the imaging direction of the imaging unit is provided, and the imaging unit captures an infrared image.
　この構成によれば、虹彩を撮像するための照明光源として人には見えない赤外線が用いられるので、虹彩認証しようとするユーザがまぶしくない。 According to this configuration, since infrared rays that are invisible to humans are used as an illumination light source for imaging the iris, the user who tries to perform iris authentication is not dazzled.
　また、本発明の一局面に従う虹彩認証システムは、上述の虹彩認証装置と、前記撮像部、前記赤外線検出部、及び前記駆動部が取り付けられた板状の扉とを含む。 Further, an iris authentication system according to one aspect of the present invention includes the above-described iris authentication device, and a plate-like door to which the imaging unit, the infrared detection unit, and the drive unit are attached.
　この構成によれば、扉に取り付けられた虹彩認証装置によって、扉を開けようとするユーザの虹彩認証を行うことが可能となる。 According to this configuration, it is possible to perform iris authentication of a user who tries to open the door by the iris authentication device attached to the door.
　また、前記第一離間方向は、前記扉の上下方向に沿う方向であることが好ましい。 Further, the first separation direction is preferably a direction along the vertical direction of the door.
　この構成によれば、扉の前で虹彩認証しようとするユーザが、子供であったり大人であったり、背の高さが異なる場合であっても、その背の高さに応じた目の位置に、撮像方向を向けて虹彩を撮像し、虹彩認証を行うことが可能となる。 According to this configuration, even if the user who is trying to perform iris authentication in front of the door is a child or an adult, or when the height is different, the position of the eyes according to the height of the back In addition, it is possible to perform iris authentication by imaging the iris in the imaging direction.
　このような構成の虹彩認証装置、及び虹彩認証システムは、ユーザの目の位置が撮影手段の撮像方向にない場合であっても、虹彩認証を行うことが容易となる。 The iris authentication device and the iris authentication system configured as described above can easily perform iris authentication even when the position of the user's eyes is not in the imaging direction of the imaging means.
本発明の第一実施形態に係る虹彩認証装置の構成の一例を示す斜視図である。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. 図１に示す虹彩認証装置の構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure of the iris authentication apparatus shown in FIG. 図１に示す虹彩認証装置の構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure of the iris authentication apparatus shown in FIG. 図１に示す虹彩認証システムの電気的構成の一例を示すブロック図である。It is a block diagram which shows an example of the electrical structure of the iris authentication system shown in FIG. 図１に示す虹彩認証システムによる駆動処理を説明するための説明図である。It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. 図１に示す虹彩認証システムによる駆動処理を説明するための説明図である。It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. 図１に示す虹彩認証システムによる駆動処理を説明するための説明図である。It is explanatory drawing for demonstrating the drive process by the iris authentication system shown in FIG. 図１に示す虹彩認証システムの動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of the iris authentication system shown in FIG. 本発明の第二実施形態に係る虹彩認証装置の構成の一例を示す正面図である。It is a front view which shows an example of a structure of the iris authentication device which concerns on 2nd embodiment of this invention. 図９に示す虹彩認証装置の電気的構成の一例を示すブロック図である。It is a block diagram which shows an example of an electrical structure of the iris authentication apparatus shown in FIG. 図９に示す虹彩認証装置の動作の一例を示すフローチャートである。It is a flowchart which shows an example of operation | movement of the iris authentication apparatus shown in FIG.
　以下、本発明に係る実施形態を図面に基づいて説明する。なお、各図において同一の符号を付した構成は、同一の構成であることを示し、その説明を省略する。
（第一実施形態） Embodiments according to the present invention will be described below 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)
　図１は、本発明の第一実施形態に係る虹彩認証システム１の構成の一例を示す斜視図である。図１に示す虹彩認証システム１は、扉２、虹彩認証装置３、及び電気錠８を備えている。虹彩認証装置３及び電気錠８は、扉２の厚み内に収容されている。 FIG. 1 is a perspective view showing an example of the configuration of an iris authentication system 1 according to the first embodiment of the present invention. An iris authentication system 1 shown in FIG. 1 includes a door 2, an iris authentication device 3, and an electric lock 8. The iris authentication device 3 and the electric lock 8 are accommodated within the thickness of the door 2.
　扉２は、略長方形の板状形状を有し、その長手方向が、鉛直方向に沿う上下方向となるように建物に取り付けられ、扉２の幅方向が左右方向（水平方向）となっている。 The door 2 has a substantially rectangular plate shape, and is attached to the building such that its longitudinal direction is the vertical direction along the vertical direction, and the width direction of the door 2 is the left-right direction (horizontal direction). .
　扉２は、その板面に沿う第一面２１と第二面２２とを有している。第一面２１は、例えば扉２が取り付けられた建物や部屋の外側に面する面であり、第二面２２は、例えば扉２が取り付けられた建物や部屋の内側に面する面である。第一面２１には把手（ドアノブ）２５が取り付けられ、第二面２２には把手２６が取り付けられている。なお、第一面２１は、例えば扉２が取り付けられた建物や部屋の内側に面する面であり、第二面２２は、例えば扉２が取り付けられた建物や部屋の外側に面する面であってもよい。 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.
　第一面２１の幅方向略中央であって、上下方向中央より上側の位置、例えば平均的な身長の人の目線の高さの位置には略矩形の開口部が形成され、窓２７とされている。窓２７は、例えばガラス窓とされている。 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 vertical direction, for example, at the height of the line of sight of a person of average height. ing. The window 27 is, for example, a glass window.
　図２、図３は、図１に示す虹彩認証装置３の構成を説明するための説明図である。図２に示す虹彩認証装置３は、撮像モジュール９と、駆動部７とを備えている。撮像モジュール９は、撮像部４、第一赤外線検出部５１、第二赤外線検出部５２、赤外線照明部６、及びこれらが取り付けられた基板３１を備えている。 2 and 3 are explanatory diagrams for explaining the configuration of the iris authentication apparatus 3 shown in FIG. The iris authentication device 3 illustrated in FIG. 2 includes an imaging module 9 and a drive unit 7. The imaging module 9 includes an imaging unit 4, a first infrared detection unit 51, a second infrared detection unit 52, an infrared illumination unit 6, and a substrate 31 to which these are attached.
　撮像部４は、画像信号を生成する撮像素子４２と、撮像素子４２に画像を結像する光学系４３と、撮像素子４２及び光学系４３を収容する筒状の鏡筒４１と、可視光の光学系４３への入射を遮断又は低減するための光フィルタ４４とを備えている。 The imaging unit 4 includes an imaging element 42 that generates an image signal, an optical system 43 that forms an image on the imaging element 42, a cylindrical barrel 41 that houses the imaging element 42 and the optical system 43, and visible light And an optical filter 44 for blocking or reducing incidence on the optical system 43.
　光学系４３は、例えば１又は複数のレンズが鏡筒４１内に配置されて構成され、光軸４３１を延長した撮像方向４３２における撮像領域４３３内の画像を、光学系４３の後端側に配置された撮像素子４２に結像する。光学系４３の前方に光フィルタ４４が配置され、光学系４３への可視光の入射が遮断又は低減されているので、光学系４３は、可視光が除かれて得られた赤外線画像を撮像素子４２に結像する。撮像方向４３２は、図１に示す扉２の窓２７から外方へ向けられている。 The optical system 43 is configured, for example, by arranging one or a plurality of lenses in the lens barrel 41, and an image in the imaging region 433 in the imaging direction 432 in which the optical axis 431 is extended is arranged on the rear end side of the optical system 43. The image is formed on the image pickup element 42 thus formed. Since the optical filter 44 is disposed in front of the optical system 43 and the incidence of visible light on the optical system 43 is blocked or reduced, the optical system 43 can capture an infrared image obtained by removing visible light from the imaging device. 42 is imaged. The imaging direction 432 is directed outward from the window 27 of the door 2 shown in FIG.
　撮像素子４２は、光学系４３により結像された画像、すなわち撮像領域４３３内の赤外線画像を画像信号に変換し、撮像画像として後述する制御部１００へ送信する。撮像素子４２は、例えばＣＣＤ（Charge Coupled Device）やＣＭＯＳ（Complementary Metal Oxide Semiconductor）等の撮像素子である。 The image sensor 42 converts an image formed by the optical system 43, that is, an infrared image in the imaging region 433 into an image signal, and transmits the image signal to the control unit 100 described later as a captured image. The image sensor 42 is an image sensor such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor).
　赤外線照明部６は、撮像部４の撮像方向４３２へ、すなわち図１に示す扉２の窓２７から外方へ、例えば波長が８５０ｎｍ前後の赤外線光を照射する。赤外線照明部６は、例えば赤外線ＬＥＤ（Light Emitting Diode）を用いて構成されている。これにより、扉２の前に人が立ち、撮像領域４３３に人の顔Ｆが入ると、その人の目が赤外線光で照射され、その目の虹彩の赤外線画像が撮像部４によって撮像される。 The infrared illumination unit 6 irradiates, for example, infrared light having a wavelength of about 850 nm in the imaging direction 432 of the imaging unit 4, that is, outward from the window 27 of the door 2 illustrated in FIG. 1. The infrared illumination unit 6 is configured using, for example, an infrared LED (Light Emitting Diode). As a result, when a person stands in front of the door 2 and a person's face F enters the imaging region 433, the person's eyes are irradiated with infrared light, and an infrared image of the iris of the eye is captured by the imaging unit 4. .
　この場合、人の目に見えない赤外線光によって人の目が照明されるので、虹彩認証を行う人に眩しさを感じさせずに、その人の虹彩の画像を撮像することができる。 In this case, since the human eye is illuminated by infrared light that is invisible to the human eye, an image of the iris of the person can be taken without making the person performing iris authentication feel dazzling.
　なお、赤外線照明部６は、認証しようとする人の目を照明することができればよく、撮像部４の上側に配設される例に限らない。撮像部４の下、右、又は左に配設されてもよく、撮像部４の上下及び／又は左右の両側に配設されていてもよい。また、赤外線照明部６の代わりに可視光を照射する照明部を設け、光フィルタ４４を備えず、撮像部４は、可視光の画像を撮像する構成であってもよい。また、照明部を備えず、自然光で虹彩画像を撮像する構成としてもよい。 The infrared illumination unit 6 is not limited to the example provided on the upper side of the imaging unit 4 as long as it can illuminate the eyes of the person who is going to authenticate. It may be disposed below, right, or left of the imaging unit 4, and may be disposed on both the upper and lower sides and / or the left and right sides of the imaging unit 4. Further, instead of the infrared illumination unit 6, an illumination unit that irradiates visible light may be provided, the optical filter 44 may not be provided, and the imaging unit 4 may be configured to capture an image of visible light. Moreover, it is good also as a structure which does not provide an illumination part but images an iris image with natural light.
　第一赤外線検出部５１、及び第二赤外線検出部５２は、人体から放射される赤外線、例えば波長１０μｍ程度の赤外線を検出する赤外線センサである。第一赤外線検出部５１は、検出された赤外線の強度を示す信号である第一赤外線強度ＳＧ１を出力する。第二赤外線検出部５２は、検出された赤外線の強度を示す信号である第二赤外線強度ＳＧ２を出力する。 The first infrared detection unit 51 and the second infrared detection unit 52 are infrared sensors that detect infrared rays emitted from the human body, for example, infrared rays having a wavelength of about 10 μm. The first infrared detector 51 outputs a first infrared intensity SG1 that is a signal indicating the intensity of the detected infrared. The second infrared detector 52 outputs a second infrared intensity SG2, which is a signal indicating the detected infrared intensity.
　第一赤外線検出部５１は、赤外線を検出する方向に指向性を有し、その指向性に応じた第一検出方向５１１に対して赤外線が検出される第一検出領域５１２を有する。第二赤外線検出部５２は、第一赤外線検出部５１に対して上下方向（第一離間方向）に離間し、かつ第一赤外線検出部５１との間に撮像部４を挟むように配置されている。第二赤外線検出部５２は、赤外線を検出する方向に指向性を有し、その指向性に応じた第二検出方向５２１に対して赤外線が検出される第二検出領域５２２を有する。 The first infrared detection unit 51 has directivity in the direction in which infrared is detected, and has a first detection region 512 in which infrared is detected with respect to the first detection direction 511 corresponding to the directivity. The second infrared detection unit 52 is arranged so as to be separated from the first infrared detection unit 51 in the vertical direction (first separation direction) and to sandwich the imaging unit 4 with the first infrared detection unit 51. Yes. The 2nd infrared detection part 52 has directivity in the direction which detects infrared rays, and has the 2nd detection area | region 522 in which infrared rays are detected with respect to the 2nd detection direction 521 according to the directivity.
　撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１は、互いに略平行にされている。なお、撮像方向４３２に対して第一検出方向５１１がなす角度と、撮像方向４３２に対して第二検出方向５２１がなす角度とが略等しければよく、必ずしも撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１は略平行に限定されない。 The imaging direction 432, the first detection direction 511, and the second detection direction 521 are substantially parallel to each other. It should be noted that the angle formed by the first detection direction 511 with respect to the imaging direction 432 and the angle formed by the second detection direction 521 with respect to the imaging direction 432 may be substantially equal, and the imaging direction 432, the first detection direction 511, The second detection direction 521 is not limited to being substantially parallel.
　第一検出領域５１２の一部であって、かつ第二赤外線検出部５２に近い側は、第一重複領域５１３とされている。第二検出領域５２２の一部であって、かつ第一赤外線検出部５１に近い側は、第二重複領域５２３とされている。第一重複領域５１３、第二重複領域５２３、及び撮像領域４３３は、その一部が互いに重複している。 A part of the first detection region 512 and the side close to the second infrared detection unit 52 is a first overlap region 513. A part of the second detection region 522 that is close to the first infrared detection unit 51 is a second overlapping region 523. The first overlapping region 513, the second overlapping region 523, and the imaging region 433 partially overlap each other.
　基板３１には、撮像方向４３２とは逆方向に突出する突出部３１１が設けられている。また、撮像モジュール９は、光学系４３の先端近傍に位置すると共に撮像方向４３２と直交かつ水平方向に延びる回転軸３１２回りに回動可能にされている。なお、光学系の先端近傍とは、撮像のための光学系を構成する部材のうちの最も先端部分の近傍、例えば当該先端部分から１０ｍｍ以内の位置を意味している。光学系４３の例によれば、鏡筒４１の先端から例えば１０ｍｍ以内の位置であり、鏡筒を備えない光学系の例によれば、最も先端側に設けられた光学部品の先端から例えば１０ｍｍ以内の位置である。 The substrate 31 is provided with a protruding portion 311 that protrudes in a direction opposite to the imaging direction 432. In addition, the imaging module 9 is positioned around the tip of the optical system 43 and is rotatable about a rotation axis 312 that is orthogonal to the imaging direction 432 and extends in the horizontal direction. Note that the vicinity of the tip of the optical system means the vicinity of the most distal end portion of the members constituting the optical system for imaging, for example, a position within 10 mm from the distal end portion. According to the example of the optical system 43, the position is within, for example, 10 mm from the tip of the lens barrel 41. According to the example of the optical system that does not include the lens barrel, for example, 10 mm from the tip of the optical component provided on the most distal side. The position is within.
　駆動部７は、例えば、モータ７１、ねじ軸７２、及びナット７３を備えている。ナット７３は、突出部３１１に取り付けられている。ねじ軸７２とナット７３との間にボールが介挿されており、ねじ軸７２とナット７３とでボールねじが形成されている。モータ７１は、ねじ軸７２を回転させる。そうすると、ねじ軸７２の回転に伴いナット７３がねじ軸７２に沿って移動し、基板３１が回転軸３１２を中心に回動する。ナット７３及びモータ７１は、基板３１の回動を妨げないように適宜回動等の運動可能にされている。 The drive unit 7 includes, for example, a motor 71, a screw shaft 72, and a nut 73. The nut 73 is attached to the protruding portion 311. A ball is inserted between the screw shaft 72 and the nut 73, and a ball screw is formed by the screw shaft 72 and the nut 73. The motor 71 rotates the screw shaft 72. Then, the nut 73 moves along the screw shaft 72 as the screw shaft 72 rotates, and the substrate 31 rotates around the rotation shaft 312. The nut 73 and the motor 71 can be appropriately rotated and moved so as not to prevent the rotation of the substrate 31.
　基板３１には、撮像部４、第一赤外線検出部５１、第二赤外線検出部５２、及び赤外線照明部６が取り付けられているので、撮像部４、第一赤外線検出部５１、第二赤外線検出部５２、及び赤外線照明部６が、基板３１と共に一体に向きを変更する。これにより、モータ７１の回転に応じて、撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１の向きが、上下方向に沿って一体に変更される。また、上方への移動と下方への移動は、モータ７１の回転方向に応じて切り替え可能にされている。 Since the imaging unit 4, the first infrared detection unit 51, the second infrared detection unit 52, and the infrared illumination unit 6 are attached to the substrate 31, the imaging unit 4, the first infrared detection unit 51, and the second infrared detection. The unit 52 and the infrared illumination unit 6 change the direction together with the substrate 31. Thereby, according to rotation of the motor 71, the direction of the imaging direction 432, the 1st detection direction 511, and the 2nd detection direction 521 is changed integrally along an up-down direction. Further, the upward movement and the downward movement can be switched according to the rotation direction of the motor 71.
　以下、撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１の向きを、撮像モジュール９の向きと称する。 Hereinafter, the directions of the imaging direction 432, the first detection direction 511, and the second detection direction 521 are referred to as the orientation of the imaging module 9.
　なお、駆動部７は、撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１の向き、すなわち撮像モジュール９の向きを、上下方向（第一離間方向）に沿って変更可能であればよく、例えばギヤや、ラックアンドピニオン等を用いて撮像モジュール９を駆動してもよく、ソレノイド、リニアモータ、あるいはエアシリンダ等の駆動装置を用いてもよい。 In addition, if the drive part 7 can change the direction of the imaging direction 432, the 1st detection direction 511, and the 2nd detection direction 521, ie, the direction of the imaging module 9, along the up-down direction (1st separation direction). For example, the imaging module 9 may be driven using a gear, a rack and pinion, or a driving device such as a solenoid, a linear motor, or an air cylinder may be used.
　図４は、図１に示す虹彩認証システム１の電気的構成の一例を示すブロック図である。図４に示す虹彩認証システム１は、第一赤外線検出部５１、第二赤外線検出部５２、撮像素子４２、赤外線照明部６、駆動部７、及び電気錠８が、制御部１００に接続されて構成されている。 FIG. 4 is a block diagram showing an example of the electrical configuration of the iris authentication system 1 shown in FIG. In the iris authentication system 1 shown in FIG. 4, a first infrared detection unit 51, a second infrared detection unit 52, an image sensor 42, an infrared illumination unit 6, a drive unit 7, and an electric lock 8 are connected to the control unit 100. It is configured.
　制御部１００は、例えば、所定の演算処理を実行するＣＰＵ（Central Processing Unit）、一時的にデータを記憶するＲＡＭ（Random Access Memory）、所定の制御プログラムやデータを記憶するフラッシュメモリ、ＥＥＰＲＯＭ（Electrically Erasable Programmable Read-Only Memory）等の不揮発性の記憶部、及びこれらの周辺回路等を備えて構成されている。上述の記憶部は、認証可能なユーザの虹彩の画像、又は虹彩の画像から得られた特徴データ等の認証用基準データが予め記憶された記憶部１０５としても用いられる。 The control unit 100 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a RAM (Random Access Memory) that temporarily stores data, a flash memory that stores predetermined control programs and data, and an EEPROM (Electrically A non-volatile storage unit such as Erasable Programmable Read-Only Memory, and peripheral circuits thereof are configured. The storage unit described above is also used as a storage unit 105 in which authentication reference data such as an iris image of a user who can be authenticated or feature data obtained from an iris image is stored in advance.
　そして、制御部１００は、所定の制御プログラムを実行することによって、駆動制御部１０１、撮像制御部１０２、画像処理部１０３、及び認証処理部１０４として機能する。 The control unit 100 functions as a drive control unit 101, an imaging control unit 102, an image processing unit 103, and an authentication processing unit 104 by executing a predetermined control program.
　なお、制御部１００は、必ずしも扉２に内装される例に限らない。例えば、制御部１００は、扉２の外部に設けられ、ケーブルや無線通信の通信手段によって、制御部１００が扉２と接続される構成であってもよい。また、制御部１００の一部、例えば認証処理部１０４が扉２の外部に設けられる構成であってもよい。また、制御部１００の全部又は一部が、ＡＳＩＣ（application specific integrated circuit）等の専用ＩＣ（Integrated Circuit）で構成されていてもよく、オペアンプやコンパレータ等の回路素子によって構成されていてもよい。 Note that the control unit 100 is not necessarily limited to the example of being housed in the door 2. For example, the control unit 100 may be provided outside the door 2 and connected to the door 2 by a cable or wireless communication means. Moreover, the structure by which a part of control part 100, for example, the authentication process part 104, is provided in the exterior of the door 2 may be sufficient. Further, all or part of the control unit 100 may be configured by a dedicated IC (Integrated Circuit) such as an ASIC (application specific integrated circuit), or may be configured by a circuit element such as an operational amplifier or a comparator.
　駆動制御部１０１は、第一赤外線検出部５１及び第二赤外線検出部５２により検出された赤外線に基づいて、駆動部７によって、撮像モジュール９の向きを、赤外線を放射する放射源（人の顔）の方向へ向けさせる駆動処理を実行する。具体的には、駆動処理は、第一赤外線検出部５１及び第二赤外線検出部５２の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、駆動部７によって撮像モジュール９の向きを変更させる。なお、駆動制御部１０１は、例えばオペアンプを用いた差動増幅回路やコンパレータ等によって構成されていてもよく、駆動制御部１０１として種々の構成を採用することができる。 Based on the infrared rays detected by the first infrared detection unit 51 and the second infrared detection unit 52, the drive control unit 101 causes the drive unit 7 to change the direction of the imaging module 9 to a radiation source (human face) that emits infrared rays. ) Is executed to be directed in the direction of). Specifically, the driving process is performed in the direction in which the detection unit that has obtained a stronger infrared detection intensity is disposed, of the first infrared detection unit 51 and the second infrared detection unit 52. 7 changes the orientation of the imaging module 9. The drive control unit 101 may be configured by, for example, a differential amplifier circuit using an operational amplifier, a comparator, or the like, and various configurations can be adopted as the drive control unit 101.
　この場合、撮像モジュール９は、回転軸３１２を中心に回動し、撮像部４、第一赤外線検出部５１、及び第二赤外線検出部５２が回転軸３１２回りに旋回することにより、撮像方向４３２、第一検出方向５１１、及び第二検出方向５２１が変更される。そして、駆動制御部１０１は、第一赤外線検出部５１で検出された赤外線の強度と第二赤外線検出部５２で検出された赤外線の強度との差が予め設定された基準値Ｍ以下になると、駆動部７による撮像モジュール９の駆動を停止させ、駆動処理の終了を示す駆動終了信号を撮像制御部１０２へ出力する。基準値Ｍは、第一赤外線検出部５１及び第二赤外線検出部５２の赤外線検出精度のばらつきや誤差に相当する値が予め設定されている。 In this case, the imaging module 9 rotates around the rotation axis 312, and the imaging unit 4, the first infrared detection unit 51, and the second infrared detection unit 52 rotate around the rotation axis 312, thereby causing an imaging direction 432. The first detection direction 511 and the second detection direction 521 are changed. Then, when the difference between the infrared intensity detected by the first infrared detection unit 51 and the infrared intensity detected by the second infrared detection unit 52 is equal to or less than a preset reference value M, the drive control unit 101 The drive of the imaging module 9 by the drive unit 7 is stopped, and a drive end signal indicating the end of the drive process is output to the imaging control unit 102. As the reference value M, a value corresponding to a variation or error in the infrared detection accuracy of the first infrared detection unit 51 and the second infrared detection unit 52 is set in advance.
　通常、人が服を着た状態では、顔（頭部）と両手以外の部分は服で被われている。そのため、顔（頭部）と両手以外の部分から放射される赤外線は服で遮蔽される。また、手よりも顔の面積の方が大きいので、人体から放射される赤外線は、顔からの放射量が最も多くなり、第一赤外線検出部５１及び第二赤外線検出部５２で検出される赤外線強度は、顔が最も強くなる。 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, the infrared rays emitted from the human body have the largest amount of radiation from the face, and the infrared rays detected by the first infrared detector 51 and the second infrared detector 52 are detected. The face is strongest on the face.
　従って、駆動処理によれば、赤外線の放射強度が強い顔の方向に、撮像モジュール９が向けられる。これにより、撮像部４の撮像方向４３２が人の顔の方向に向けられるので、撮像領域４３３内に人の目が入ることになる結果、人の虹彩が撮像部４によって撮像可能となり、虹彩認証を実行可能となる。 Therefore, according to the driving process, the imaging module 9 is directed toward the face where the infrared radiation intensity is strong. As a result, since the imaging direction 432 of the imaging unit 4 is directed toward the human face, the human eye enters the imaging region 433. As a result, the human iris can be imaged by the imaging unit 4, and iris authentication is performed. Can be executed.
　駆動制御部１０１は、第一赤外線検出部５１及び第二赤外線検出部５２で検出された第一赤外線強度ＳＧ１及び第二赤外線強度ＳＧ２のうち少なくとも一方が、予め設定された設定時間ｔ内に予め設定された判定強度ｋを超えて変化した場合、すなわち微分的に赤外線強度が変化した場合に、上述の駆動処理を実行する。設定時間ｔ及び判定強度ｋは、人が第一検出領域５１２又は第二検出領域５２２に入った、あるいは出た場合に生じる第一赤外線強度ＳＧ１及び第二赤外線強度ＳＧ２の変化の速度やその変化量を、例えば実験的に求めて予め設定されている。 In the drive control unit 101, at least one of the first infrared intensity SG <b> 1 and the second infrared intensity SG <b> 2 detected by the first infrared detection unit 51 and the second infrared detection unit 52 is set in advance within a preset set time t. The drive process described above is executed when the determination intensity changes beyond the set determination intensity k, that is, when the infrared intensity changes differentially. The set time t and the determination intensity k are the change speed and the change of the first infrared intensity SG1 and the second infrared intensity SG2 that occur when a person enters or exits the first detection area 512 or the second detection area 522. The amount is determined in advance by, for example, experimental determination.
　撮像制御部１０２は、駆動制御部１０１から駆動終了信号が出力されると、赤外線照明部６を点灯させて認証対象の人の目を照明させ、その目の画像を撮像部４によって撮像させた後、赤外線照明部６を消灯させる。 When a drive end signal is output from the drive control unit 101, the imaging control unit 102 turns on the infrared illumination unit 6 to illuminate the eyes of the person to be authenticated, and causes the imaging unit 4 to capture an image of the eyes. Thereafter, the infrared illumination unit 6 is turned off.
　画像処理部１０３は、撮像部４によって撮像された画像から、公知の画像認識技術により虹彩の画像を抽出し、認証処理部１０４へ出力する。 The image processing unit 103 extracts an iris image from the image captured by the imaging unit 4 using a known image recognition technique, and outputs the iris image to the authentication processing unit 104.
　認証処理部１０４は、画像処理部１０３から送られてきた虹彩の画像に基づき、公知の虹彩認証技術により虹彩認証を実行する。具体的には、認証処理部１０４は、画像処理部１０３から送られてきた虹彩の画像、又はその画像から得られた特徴データを、記憶部１０５に記憶されている虹彩の画像、又は特徴データと照合することによって、虹彩認証を実行する。認証処理部１０４は、認証に成功すると、電気錠８を解錠させる。これにより、認証に成功したユーザが扉２を開けることが可能になる。 The authentication processing unit 104 performs iris authentication by a known iris authentication technique based on the iris image sent from the image processing unit 103. Specifically, the authentication processing unit 104 uses an iris image sent from the image processing unit 103 or feature data obtained from the image as an iris image or feature data stored in the storage unit 105. Iris authentication is performed by comparing with. The authentication processing unit 104 unlocks the electric lock 8 when the authentication is successful. Thereby, a user who has succeeded in authentication can open the door 2.
　図５～図７は、図１に示す虹彩認証システム１による駆動処理を説明するための説明図である。虹彩認証システム１は、扉２の前に立った人の虹彩を撮像することによって虹彩認証を実行する。このとき、子供や大人、その他身長差によって、目の高さが異なる。図５に示す顔Ｆ１、Ｆ２は、撮像領域４３３よりも低い位置に位置し、顔Ｆ３、Ｆ４は、撮像領域４３３よりも高い位置に位置している。そして、撮像部４は、顔Ｆ１，Ｆ３の一部しか撮像することができず、顔Ｆ２，Ｆ４については全く撮像することができない。そのため、虹彩認証システム１は、このままでは顔Ｆ１～Ｆ４の目を撮像することができず、虹彩認証を実行することができない。 5 to 7 are explanatory diagrams for explaining the driving process by the iris authentication system 1 shown in FIG. The iris authentication system 1 performs iris authentication by imaging the iris of a person standing in front of the door 2. At this time, the height of the eyes varies depending on the height difference between children, adults, and others. The faces F1 and F2 illustrated in FIG. 5 are located at a position lower than the imaging area 433, and the faces F3 and F4 are located at a position higher than the imaging area 433. And the imaging part 4 can image only part of the faces F1 and F3, and cannot image the faces F2 and F4 at all. Therefore, the iris authentication system 1 cannot capture the eyes of the faces F1 to F4 as it is, and cannot perform iris authentication.
　そこで、駆動制御部１０１は、赤外線の放出源である人の顔の方へ、撮像部４の撮像方向４３２を向けて人の虹彩を撮像部４が撮像できるようにすることで、虹彩認証を実行可能とするようになっている。 Therefore, the drive control unit 101 performs iris authentication by allowing the imaging unit 4 to image the human iris toward the human face, which is an infrared emission source, by directing the imaging direction 432 of the imaging unit 4. It is supposed to be executable.
　図８は、図１に示す虹彩認証システム１の動作の一例を示すフローチャートである。まず、駆動制御部１０１は、第一赤外線検出部５１及び第二赤外線検出部５２で検出された第一赤外線強度ＳＧ１及び第二赤外線強度ＳＧ２のうち少なくとも一方が、設定時間ｔ内に判定強度ｋを超えて変化した場合（ステップＳ１でＹＥＳ）、すなわち人が第一検出領域５１２又は第二検出領域５２２に出入りしたと考えられる場合に、ステップＳ２～Ｓ５の駆動処理を実行する。これにより、例えば日差しに暖められてゆっくり温度が上昇した対象物などに対しては、駆動処理が実行されることがないので、人の顔以外の物に対して撮像モジュール９が向けられるおそれが低減される。 FIG. 8 is a flowchart showing an example of the operation of the iris authentication system 1 shown in FIG. First, the drive control unit 101 determines that at least one of the first infrared intensity SG1 and the second infrared intensity SG2 detected by the first infrared detection unit 51 and the second infrared detection unit 52 is within the set time t. Is changed (YES in step S1), that is, when it is considered that a person has entered or exited the first detection area 512 or the second detection area 522, the driving process of steps S2 to S5 is executed. Accordingly, for example, the driving process is not performed on an object that has been warmed up by the sun and the temperature has risen slowly, and thus the imaging module 9 may be directed toward an object other than the human face. Reduced.
　ステップＳ２において、駆動制御部１０１は、第二赤外線強度ＳＧ２と、第一赤外線強度ＳＧ１に基準値Ｍを加算した値（ＳＧ１＋Ｍ）とを比較し（ステップＳ２）、第二赤外線強度ＳＧ２が（ＳＧ１＋Ｍ）より強い場合（ステップＳ２でＹＥＳ）、駆動部７によって撮像モジュール９を下方に向けさせ（ステップＳ３）、再びステップＳ２を繰り返す。 In step S2, the drive control unit 101 compares the second infrared intensity SG2 with a value (SG1 + M) obtained by adding the reference value M to the first infrared intensity SG1 (step S2), and the second infrared intensity SG2 is (SG1 + M). ) If it is stronger (YES in step S2), the image pickup module 9 is directed downward by the drive unit 7 (step S3), and step S2 is repeated again.
　例えば図５に示す顔Ｆ２は、その全体が第一検出領域５１２外であり、その全体が第二検出領域５２２内にあるので、第二赤外線強度ＳＧ２が第一赤外線強度ＳＧ１よりも十分に大きくなり、ＳＧ２が（ＳＧ１＋Ｍ）より強くなり（ステップＳ２でＹＥＳ）、図６に示すように撮像モジュール９が下方に向けられる（ステップＳ３）。なお、図５において顔Ｆ１は、第一検出領域５１２と第二検出領域５２２の両方の領域に入っているが、第一検出領域５１２よりも第二検出領域５２２に入っている顔の範囲（面積）の方が広いので、第二赤外線強度ＳＧ２が第一赤外線強度ＳＧ１よりも十分に大きくなり、撮像モジュール９が下方に向けられることになる。 For example, the face F2 shown in FIG. 5 is entirely outside the first detection area 512 and entirely inside the second detection area 522, so the second infrared intensity SG2 is sufficiently larger than the first infrared intensity SG1. SG2 becomes stronger than (SG1 + M) (YES in step S2), and the imaging module 9 is directed downward as shown in FIG. 6 (step S3). In FIG. 5, the face F <b> 1 is included in both the first detection area 512 and the second detection area 522, but the range of the face that is included in the second detection area 522 rather than the first detection area 512 ( Therefore, the second infrared intensity SG2 is sufficiently larger than the first infrared intensity SG1, and the imaging module 9 is directed downward.
　一方、第二赤外線強度ＳＧ２が（ＳＧ１＋Ｍ）以下の場合（ステップＳ２でＮＯ）、第一赤外線強度ＳＧ１と、第二赤外線強度ＳＧ２に基準値Ｍを加算した値（ＳＧ２＋Ｍ）とを比較し（ステップＳ４）、第一赤外線強度ＳＧ１が（ＳＧ２＋Ｍ）より強い場合（ステップＳ４でＹＥＳ）、駆動制御部１０１は、駆動部７によって撮像モジュール９を上方に向けさせ（ステップＳ５）、再びステップＳ２以降が繰り返される。 On the other hand, when the second infrared intensity SG2 is equal to or lower than (SG1 + M) (NO in step S2), the first infrared intensity SG1 is compared with the value (SG2 + M) obtained by adding the reference value M to the second infrared intensity SG2 (step 2). S4) When the first infrared intensity SG1 is stronger than (SG2 + M) (YES in Step S4), the drive control unit 101 causes the drive unit 7 to point the imaging module 9 upward (Step S5), and Step S2 and subsequent steps are performed again. Repeated.
　例えば図５に示す顔Ｆ４は、その大部分が第一検出領域５１２内であり、その全体が第二検出領域５２２外にあるので、第一赤外線強度ＳＧ１が第二赤外線強度ＳＧ２よりも十分に大きくなり、ＳＧ１が（ＳＧ２＋Ｍ）より強くなり（ステップＳ４でＹＥＳ）、図７に示すように撮像モジュール９が上方に向けられる（ステップＳ５）。なお、図５において顔Ｆ３は、第一検出領域５１２と第二検出領域５２２の両方の領域に入っているが、第二検出領域５２２よりも第一検出領域５１２に入っている顔の範囲（面積）の方が広いので、第一赤外線強度ＳＧ１が第二赤外線強度ＳＧ２よりも十分に大きくなり、撮像モジュール９が上方に向けられることになる。 For example, most of the face F4 shown in FIG. 5 is in the first detection region 512 and entirely outside the second detection region 522, so that the first infrared intensity SG1 is sufficiently higher than the second infrared intensity SG2. SG1 becomes stronger than (SG2 + M) (YES in step S4), and the imaging module 9 is directed upward as shown in FIG. 7 (step S5). In FIG. 5, the face F <b> 3 is in both the first detection area 512 and the second detection area 522, but the range of the face that is in the first detection area 512 rather than the second detection area 522 ( Therefore, the first infrared intensity SG1 is sufficiently larger than the second infrared intensity SG2, and the imaging module 9 is directed upward.
　一方、第一赤外線強度ＳＧ１が（ＳＧ２＋Ｍ）以下の場合（ステップＳ４でＮＯ）、第一赤外線強度ＳＧ１と第二赤外線強度ＳＧ２との差が基準値Ｍ以下（Ｍ≧｜ＳＧ１－ＳＧ２｜）になったことを意味し、上下方向についてこの向きで撮像モジュール９が保持される。この場合、図６、図７に示すように、第一検出領域５１２と第二検出領域５２２とが重複する領域に顔Ｆ２又は顔Ｆ４が入り、第一検出領域５１２内の顔の面積と第二検出領域５２２内の顔の面積が略等しくなったことになる。このとき、第一重複領域５１３、第二重複領域５２３、及び撮像領域４３３が互いに重複するように配置されているので、顔Ｆ２又は顔Ｆ４は、撮像領域４３３に入り、撮像部４で人の目を撮像することが可能となる。 On the other hand, when the first infrared intensity SG1 is equal to or less than (SG2 + M) (NO in step S4), the difference between the first infrared intensity SG1 and the second infrared intensity SG2 is equal to or less than the reference value M (M ≧ | SG1-SG2 |). The image pickup module 9 is held in this direction in the vertical direction. In this case, as shown in FIGS. 6 and 7, the face F2 or the face F4 enters the area where the first detection area 512 and the second detection area 522 overlap, and the face area in the first detection area 512 This means that the areas of the faces in the two detection areas 522 are substantially equal. At this time, since the first overlapping region 513, the second overlapping region 523, and the imaging region 433 are arranged so as to overlap each other, the face F2 or the face F4 enters the imaging region 433, and the imaging unit 4 The eye can be imaged.
　これにより、ユーザの目の位置が撮影手段の撮像方向にない場合であっても、ユーザの目の方向に撮像モジュール９を向けることができるので、虹彩認証を行うことが容易となる。 Thereby, even when the user's eye position is not in the imaging direction of the imaging means, the imaging module 9 can be directed toward the user's eye, so that it is easy to perform iris authentication.
　次に、撮像制御部１０２は、赤外線照明部６を点灯させて撮像領域４３３を赤外線で照明させ（ステップＳ６）、撮像部４によって撮像領域４３３の撮像を実行させ（ステップＳ７）、赤外線照明部６を消灯させる（ステップＳ８）。このように、ステップＳ２～Ｓ５の駆動処理が終わった後に赤外線照明部６を点灯させることで、赤外線照明部６から照射された赤外線が、第一赤外線検出部５１又は第二赤外線検出部５２で検出されて撮像モジュール９が誤った方向に向けられるおそれが低減される。 Next, the imaging control unit 102 turns on the infrared illumination unit 6 to illuminate the imaging region 433 with infrared rays (step S6), causes the imaging unit 4 to perform imaging of the imaging region 433 (step S7), and infrared illumination unit 6 is turned off (step S8). In this way, by illuminating the infrared illumination unit 6 after the drive processing of steps S2 to S5 is completed, the infrared rays emitted from the infrared illumination unit 6 are transmitted by the first infrared detection unit 51 or the second infrared detection unit 52. The possibility that the imaging module 9 is detected and directed in the wrong direction is reduced.
　次に、画像処理部１０３は、撮像部４によって撮像された撮像画像から虹彩の画像を抽出し、認証処理部１０４へ出力する（ステップＳ９）。 Next, the image processing unit 103 extracts an iris image from the captured image captured by the imaging unit 4, and outputs the extracted iris image to the authentication processing unit 104 (step S9).
　次に、認証処理部１０４は、画像処理部１０３から送られてきた虹彩の画像に基づき虹彩認証を実行する（ステップＳ１０）。そして、認証に成功した場合（ステップＳ１１でＹＥＳ）、認証処理部１０４は、電気錠８を解錠させる（ステップＳ１２）。これにより、認証に成功したユーザが扉２を開けることが可能になる。一方、認証に失敗した場合（ステップＳ１１でＮＯ）、認証処理部１０４は、電気錠８を施錠したままで処理を終了する。これにより、予め登録された正規のユーザ以外は扉２を開けることができないので、セキュリティが確保される。 Next, the authentication processing unit 104 performs iris authentication based on the iris image sent from the image processing unit 103 (step S10). If the authentication is successful (YES in step S11), the authentication processing unit 104 unlocks the electric lock 8 (step S12). Thereby, a user who has succeeded in authentication can open the door 2. On the other hand, when the authentication fails (NO in step S11), the authentication processing unit 104 ends the process while keeping the electric lock 8 locked. Thereby, since only the authorized user registered in advance can open the door 2, security is ensured.
　以上、ステップＳ１～Ｓ１２の処理によれば、ユーザの目の位置が撮像部４の撮像方向にない場合であっても、撮像部４の向きを変更してユーザの目を撮影することができるので、虹彩認証を行うことが容易となる。 As described above, according to the processing in steps S1 to S12, even when the position of the user's eyes is not in the imaging direction of the imaging unit 4, the direction of the imaging unit 4 can be changed to capture the user's eyes. Therefore, it becomes easy to perform iris authentication.
　なお、第一検出領域５１２及び第二検出領域５２２の近傍に、人体以外の赤外線の放出源がない環境では、人体以外のものに誤って撮像モジュール９が向けられることが無いので、ステップＳ１を実行しない構成であってもよい。また、ステップＳ２，Ｓ４において、必ずしも基準値Ｍを用いる必要はなく、基準値Ｍはゼロであってもよい。 Note that in an environment where there is no infrared emission source other than the human body in the vicinity of the first detection region 512 and the second detection region 522, the imaging module 9 is not mistakenly directed to anything other than the human body. The configuration may not be executed. In steps S2 and S4, the reference value M is not necessarily used, and the reference value M may be zero.
　また、虹彩認証システム１は、扉を解錠するために虹彩認証を実行するものに限られず、ステップＳ１２を実行しない構成であってもよい。また、第一赤外線検出部５１と第二赤外線検出部５２とを赤外線検出部として用いる例を示したが、赤外線検出部は、赤外線の放出方向を検出することができればよく、必ずしも第一赤外線検出部５１と第二赤外線検出部５２とを用いる例に限らない。 Further, the iris authentication system 1 is not limited to performing the iris authentication in order to unlock the door, and may be configured not to execute step S12. Moreover, although the example which uses the 1st infrared detection part 51 and the 2nd infrared detection part 52 as an infrared detection part was shown, the infrared detection part should just be able to detect the discharge | release direction of an infrared rays, and does not necessarily require a 1st infrared detection. It is not restricted to the example using the part 51 and the 2nd infrared detection part 52. FIG.
　また、虹彩認証装置３は、必ずしも扉２に取り付けられる例に限らず、第一離間方向は、必ずしも上下方向でなくてもよい。第一離間方向は、水平方向であってもよく、その他任意の方向であってよい。
（第二実施形態） Moreover, the iris authentication apparatus 3 is not necessarily limited to the example attached to the door 2, and the first separation direction may not necessarily be the vertical direction. The first separation direction may be a horizontal direction or any other direction.
(Second embodiment)
　次に、本発明の第二実施形態に係る虹彩認証装置３ａについて説明する。図９は、本発明の第二実施形態に係る虹彩認証装置３ａの構成の一例を示す正面図である。図１０は、図９に示す虹彩認証装置３ａの電気的構成の一例を示すブロック図である。 Next, the iris authentication device 3a according to the second embodiment of the present invention will be described. FIG. 9 is a front view showing an example of the configuration of the iris authentication device 3a according to the second embodiment of the present invention. FIG. 10 is a block diagram showing an example of the electrical configuration of the iris authentication device 3a shown in FIG.
　図９に示す虹彩認証装置３ａと図１に示す虹彩認証装置３とでは、下記の点で異なる。すなわち、図９に示す虹彩認証装置３ａは、撮像モジュール９ａと、駆動部７と同様に構成された上下駆動部７ａ（駆動部）と、左右駆動部７ｂ（駆動部）と、これらを収容する例えば透明球状の筐体１０と、筐体１０を支持するスタンド１１とを備えている。 9 differs from the iris authentication device 3a shown in FIG. 1 in the following points. That is, the iris authentication apparatus 3a shown in FIG. 9 accommodates the imaging module 9a, the vertical drive unit 7a (drive unit) configured similarly to the drive unit 7, and the left and right drive unit 7b (drive unit). For example, a transparent spherical housing 10 and a stand 11 that supports the housing 10 are provided.
　撮像モジュール９ａには、撮像モジュール９の構成に加えて第三赤外線検出部５３と第四赤外線検出部５４とがさらに設けられている。撮像部４を間に挟んで左右方向（第二離間方向）に離間して第三赤外線検出部５３と第四赤外線検出部５４とが配設されている。図９に示す例では、紙面手前方向が撮像方向４３２とされている。 The imaging module 9 a is further provided with a third infrared detection unit 53 and a fourth infrared detection unit 54 in addition to the configuration of the imaging module 9. A third infrared detection unit 53 and a fourth infrared detection unit 54 are disposed apart from each other in the left-right direction (second separation direction) with the imaging unit 4 interposed therebetween. In the example illustrated in FIG. 9, the front side of the drawing is the imaging direction 432.
　第三赤外線検出部５３は、第一赤外線検出部５１と同様に構成され、その検出された赤外線の強度を示す信号を、第三赤外線強度ＳＧ３として制御部１００ａへ出力する。第四赤外線検出部５４は、第二赤外線検出部５２と同様に構成され、その検出された赤外線の強度を示す信号を、第四赤外線強度ＳＧ４として制御部１００ａへ出力する。 The third infrared detection unit 53 is configured in the same manner as the first infrared detection unit 51, and outputs a signal indicating the detected infrared intensity to the control unit 100a as the third infrared intensity SG3. The fourth infrared detecting unit 54 is configured in the same manner as the second infrared detecting unit 52, and outputs a signal indicating the detected infrared intensity as the fourth infrared intensity SG4 to the control unit 100a.
　第三赤外線検出部５３、撮像部４、及び第四赤外線検出部５４は、第一赤外線検出部５１、撮像部４、及び第二赤外線検出部５２を、光軸４３１回りに９０度回転させたのと同様に配設されている。すなわち、第三赤外線検出部５３は、第一赤外線検出部５１の第一検出方向５１１、第一検出領域５１２、及び第一重複領域５１３に対応する第三検出方向、第三検出領域、及び第三重複領域を有している。第四赤外線検出部５４は、第二赤外線検出部５２の第二検出方向５２１、第二検出領域５２２、及び第二重複領域５２３に対応する第四検出方向、第四検出領域、及び第四重複領域を有している。第三重複領域、第四重複領域、及び撮像領域４３３はその一部が互いに重複するように配置されている。 The third infrared detection unit 53, the imaging unit 4, and the fourth infrared detection unit 54 rotate the first infrared detection unit 51, the imaging unit 4, and the second infrared detection unit 52 by 90 degrees around the optical axis 431. It is arrange | positioned similarly to. That is, the third infrared detection unit 53 includes a third detection direction, a third detection region, and a first detection direction corresponding to the first detection direction 511, the first detection region 512, and the first overlap region 513 of the first infrared detection unit 51. It has three overlapping areas. The fourth infrared detection unit 54 includes a fourth detection direction, a fourth detection region, and a fourth overlap corresponding to the second detection direction 521, the second detection region 522, and the second overlap region 523 of the second infrared detection unit 52. Has an area. The third overlapping region, the fourth overlapping region, and the imaging region 433 are arranged so that parts thereof overlap each other.
　赤外線照明部６、第一赤外線検出部５１、第二赤外線検出部５２、第三赤外線検出部５３、第四赤外線検出部５４、及び撮像部４が、略板状の基板３１ａによって一体に保持されて撮像モジュール９ａが構成されている。以下、第一検出方向５１１、第二検出方向５２１、第三検出方向、第四検出方向、及び撮像方向４３２をまとめて撮像モジュール９ａの方向と称する。図９では、撮像モジュール９ａは、紙面手前方向を向いている。 The infrared illumination unit 6, the first infrared detection unit 51, the second infrared detection unit 52, the third infrared detection unit 53, the fourth infrared detection unit 54, and the imaging unit 4 are integrally held by a substantially plate-shaped substrate 31a. The imaging module 9a is configured. Hereinafter, the first detection direction 511, the second detection direction 521, the third detection direction, the fourth detection direction, and the imaging direction 432 are collectively referred to as the direction of the imaging module 9a. In FIG. 9, the imaging module 9 a faces the front side of the page.
　上下駆動部７ａは、駆動部７と同様に構成され、撮像モジュール９ａの向きを上下方向に沿って変化させ、左右駆動部７ｂは、例えば駆動部７を９０度回転させたのと同様の構成とされ、撮像モジュール９ａの向きを左右方向（水平方向）に沿って変化させる。 The vertical drive unit 7a is configured in the same manner as the drive unit 7, changes the orientation of the imaging module 9a along the vertical direction, and the left and right drive unit 7b has the same configuration as when the drive unit 7 is rotated by 90 degrees, for example. The direction of the imaging module 9a is changed along the left-right direction (horizontal direction).
　制御部１００ａは、駆動制御部として、上下駆動制御部１０１Ｖと左右駆動制御部１０１Ｈとを備える点で異なる。上下駆動制御部１０１Ｖは、駆動制御部１０１と同様に構成され、駆動部７の代わりに上下駆動部７ａの動作を制御する。左右駆動制御部１０１Ｈは、駆動制御部１０１とは、第一赤外線強度ＳＧ１及び第二赤外線強度ＳＧ２に基づき駆動部７を制御する代わりに、第三赤外線強度ＳＧ３及び第四赤外線強度ＳＧ４に基づき左右駆動部７ｂを制御する点で異なる。 The control unit 100a is different in that it includes a vertical drive control unit 101V and a left / right drive control unit 101H as drive control units. The vertical drive control unit 101V is configured similarly to the drive control unit 101, and controls the operation of the vertical drive unit 7a instead of the drive unit 7. The left and right drive control unit 101H differs from the drive control unit 101 based on the third infrared intensity SG3 and the fourth infrared intensity SG4 instead of controlling the drive unit 7 based on the first infrared intensity SG1 and the second infrared intensity SG2. The difference is that the drive unit 7b is controlled.
　その他の構成は図１に示す虹彩認証装置３と同様であるのでその説明を省略する。図１１は、図９に示す虹彩認証装置３ａの動作の一例を示すフローチャートである。まず、上下駆動制御部１０１Ｖ又は左右駆動制御部１０１Ｈは、第一赤外線強度ＳＧ１、第二赤外線強度ＳＧ２、第三赤外線強度ＳＧ３、及び第四赤外線強度ＳＧ４のうち少なくとも一つが、設定時間ｔ内に判定強度ｋを超えて変化した場合（ステップＳ１ａでＹＥＳ）、ステップＳ２～Ｓ５、及びステップＳ２１～Ｓ２４の駆動処理を実行する。これにより、例えば日差しに暖められてゆっくり温度が上昇した対象物などに対しては、駆動処理が実行されることがないので、人の顔以外の物に対して撮像モジュール９が向けられるおそれが低減される。 Other configurations are the same as those of the iris authentication apparatus 3 shown in FIG. FIG. 11 is a flowchart showing an example of the operation of the iris authentication device 3a shown in FIG. First, the vertical drive control unit 101V or the left / right drive control unit 101H has at least one of the first infrared intensity SG1, the second infrared intensity SG2, the third infrared intensity SG3, and the fourth infrared intensity SG4 within the set time t. If it has changed beyond the determination strength k (YES in step S1a), the drive processing of steps S2 to S5 and steps S21 to S24 is executed. Accordingly, for example, the driving process is not performed on an object that has been warmed up by the sun and the temperature has risen slowly, and thus the imaging module 9 may be directed toward an object other than the human face. Reduced.
　ステップＳ２～Ｓ５については、駆動制御部１０１の代わりに上下駆動制御部１０１Ｖが処理を実行する点を除き、図８と同様であるのでその説明を省略する。ステップＳ２１において、左右駆動制御部１０１Ｈは、第四赤外線強度ＳＧ４と、第三赤外線強度ＳＧ３に基準値Ｍを加算した値（ＳＧ３＋Ｍ）とを比較し（ステップＳ２１）、第四赤外線強度ＳＧ４が（ＳＧ３＋Ｍ）より強い場合（ステップＳ２１でＹＥＳ）、左右駆動部７ｂによって撮像モジュール９を右方に向けさせ（ステップＳ２２）、再びステップＳ２以降を繰り返す。 Steps S2 to S5 are the same as those in FIG. 8 except that the vertical drive control unit 101V executes the process instead of the drive control unit 101, and thus the description thereof is omitted. In step S21, the left and right drive control unit 101H compares the fourth infrared intensity SG4 with a value (SG3 + M) obtained by adding the reference value M to the third infrared intensity SG3 (step S21), and the fourth infrared intensity SG4 is ( If it is stronger than (SG3 + M) (YES in step S21), the left and right drive unit 7b causes the imaging module 9 to point to the right (step S22) and repeats step S2 and subsequent steps again.
　これにより、認証対象の人の顔が、撮像領域４３３よりも右方にあった場合であっても顔の方向に撮像領域４３３が向けられる。 Thereby, even when the face of the person to be authenticated is on the right side of the imaging area 433, the imaging area 433 is directed toward the face.
　一方、第四赤外線強度ＳＧ４が（ＳＧ３＋Ｍ）以下の場合（ステップＳ２１でＮＯ）、左右駆動制御部１０１Ｈは、第三赤外線強度ＳＧ３と、第四赤外線強度ＳＧ４に基準値Ｍを加算した値（ＳＧ４＋Ｍ）とを比較し（ステップＳ２３）、第三赤外線強度ＳＧ３が（ＳＧ４＋Ｍ）より強い場合（ステップＳ２３でＹＥＳ）、左右駆動部７ｂによって撮像モジュール９を左方に向けさせ（ステップＳ２４）、再びステップＳ２以降を繰り返す。 On the other hand, if the fourth infrared intensity SG4 is equal to or lower than (SG3 + M) (NO in step S21), the left and right drive control unit 101H adds the reference value M to the third infrared intensity SG3 and the fourth infrared intensity SG4 (SG4 + M ) (Step S23), and if the third infrared intensity SG3 is stronger than (SG4 + M) (YES in step S23), the left and right drive unit 7b causes the imaging module 9 to point left (step S24), and then step again Repeat from S2.
　これにより、認証対象の人の顔が、撮像領域４３３よりも左方にあった場合であっても顔の方向に撮像領域４３３が向けられる。一方、第三赤外線強度ＳＧ３が（ＳＧ４＋Ｍ）以下の場合（ステップＳ２３でＮＯ）、第三赤外線強度ＳＧ３と第四赤外線強度ＳＧ４との差が基準値Ｍ以下（Ｍ≧｜ＳＧ３－ＳＧ４｜）になったことを意味し、左右方向についてこの向きで撮像モジュール９が保持され、駆動処理を終了して以下、図８に示すステップＳ６～Ｓ１１と同様の処理が実行される。 Thereby, even when the face of the person to be authenticated is located to the left of the imaging area 433, the imaging area 433 is directed in the direction of the face. On the other hand, when the third infrared intensity SG3 is (SG4 + M) or less (NO in step S23), the difference between the third infrared intensity SG3 and the fourth infrared intensity SG4 is equal to or less than the reference value M (M ≧ | SG3-SG4 |). This means that the imaging module 9 is held in this direction in the left-right direction, the driving process is terminated, and the following processes similar to steps S6 to S11 shown in FIG. 8 are executed.
　以上、ステップＳ２～Ｓ５、ステップＳ２１～Ｓ２４、及びステップＳ６～Ｓ１１の処理により、虹彩認証装置３ａは、上下方向のみならず、左右方向にも撮像方向４３２を変化させて虹彩認証を実行することができる。 As described above, the iris authentication device 3a performs the iris authentication by changing the imaging direction 432 not only in the vertical direction but also in the horizontal direction by the processing of steps S2 to S5, steps S21 to S24, and steps S6 to S11. Can do.
１    虹彩認証システム
２    扉
３，３ａ    虹彩認証装置
４    撮像部
６    赤外線照明部
７    駆動部
７ａ  上下駆動部（駆動部）
７ｂ  左右駆動部（駆動部）
８    電気錠
９，９ａ    撮像モジュール
１０  筐体
１１  スタンド
２１  第一面
２２  第二面
２６  把手
２７  窓
３１，３１ａ      基板
４１  鏡筒
４２  撮像素子
４３  光学系
４４  光フィルタ
５１  第一赤外線検出部
５２  第二赤外線検出部
５３  第三赤外線検出部
５４  第四赤外線検出部
７１  モータ
７２  ねじ軸
７３  ナット
１００，１００ａ  制御部
１０１      駆動制御部
１０１Ｈ    左右駆動制御部（駆動制御部）
１０１Ｖ    上下駆動制御部（駆動制御部）
１０２      撮像制御部
１０３      画像処理部
１０４      認証処理部
１０５      記憶部
３１１      突出部
３１２      回転軸
４３１      光軸
４３２      撮像方向
４３３      撮像領域
５１１      第一検出方向
５１２      第一検出領域
５１３      第一重複領域
５２１      第二検出方向
５２２      第二検出領域
５２３      第二重複領域
Ｆ，Ｆ１～Ｆ４    顔
Ｍ    基準値
ＳＧ１      第一赤外線強度
ＳＧ２      第二赤外線強度
ＳＧ３      第三赤外線強度
ＳＧ４      第四赤外線強度 DESCRIPTION OF SYMBOLS 1 Iris authentication system 2 Door 3, 3a Iris authentication apparatus 4 Imaging part 6 Infrared illumination part 7 Drive part 7a Vertical drive part (drive part)
7b Left and right drive unit (drive unit)
8 Electric lock 9, 9a Imaging module 10 Housing 11 Stand 21 First surface 22 Second surface 26 Handle 27 Window 31, 31a Substrate 41 Lens tube 42 Imaging element 43 Optical system 44 Optical filter 51 First infrared detection unit 52 Second Infrared detector 53 Third infrared detector 54 Fourth infrared detector 71 Motor 72 Screw shaft 73 Nut 100, 100a Controller 101 Drive controller 101H Left and right drive controller (drive controller)
101V vertical drive control unit (drive control unit)
102 Imaging control unit 103 Image processing unit 104 Authentication processing unit 105 Storage unit 311 Protruding unit 312 Rotating shaft 431 Optical axis 432 Imaging direction 433 Imaging region 511 First detection direction 512 First detection region 513 First overlap region 521 Second detection direction 522 Second detection area 523 Second overlap area F, F1 to F4 Face M Reference value SG1 First infrared intensity SG2 Second infrared intensity SG3 Third infrared intensity SG4 Fourth infrared intensity

Claims (10)

  1. 　所定の撮像方向の領域である撮像領域の画像を撮像する撮像部と、
    　人体から放射される赤外線を検出する赤外線検出部と、
    　前記撮像部及び前記赤外線検出部の向きを一体に変化させる駆動部と、
    　前記赤外線検出部により検出された赤外線に基づいて前記赤外線を放射する放射源の方向へ、前記駆動部によって前記撮像部の撮像方向を向けさせる駆動処理を実行する駆動制御部と、
    　前記撮像部によって撮像された撮影画像に基づき、虹彩認証を実行する認証処理部とを備える虹彩認証装置。     An imaging unit that captures an image of an imaging area that is an area in a predetermined imaging direction;
    An infrared detector that detects infrared rays emitted from the human body;
    A drive unit that integrally changes the orientation of the imaging unit and the infrared detection unit;
    A drive control unit that executes a driving process that directs the imaging direction of the imaging unit by the driving unit toward a radiation source that emits the infrared ray based on the infrared rays detected by the infrared detection 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. 　前記赤外線検出部は、
    　前記赤外線を検出する方向に指向性を有し、その指向性に応じた第一検出方向に対して前記赤外線が検出される第一検出領域を有する第一赤外線検出部と、
    　前記第一赤外線検出部とは離間して配置され、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第二検出方向に対して前記赤外線が検出される第二検出領域を有する第二赤外線検出部とを含み、
    　前記第一検出領域の一部の領域であって、かつ前記第二赤外線検出部に近い側の領域である第一重複領域と、前記第二検出領域の一部の領域であって、かつ前記第一赤外線検出部に近い側の領域である第二重複領域と、前記撮像領域とが重複し、
    　前記駆動部は、前記撮像方向、前記第一検出方向、及び前記第二検出方向の向きを、前記第一赤外線検出部と前記第二赤外線検出部とが離間する方向である第一離間方向に沿って一体に変化させ、
    　前記駆動処理は、前記第一赤外線検出部及び前記第二赤外線検出部の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、前記駆動部によって前記撮像方向、前記第一検出方向、及び前記第二検出方向を変化させる処理である請求項１記載の虹彩認証装置。     The infrared detector is
    A first infrared detection unit having directivity in a direction in which the infrared is detected and having a first detection region in which the infrared is detected with respect to a first detection direction according to the directivity;
    A second detection region that is arranged away from the first infrared detection unit, has directivity in a direction in which the infrared is detected, and the infrared is detected in a second detection direction according to the directivity. A second infrared detector having
    A first overlapping region that is a partial region of the first detection region and a region closer to the second infrared detection unit, a partial region of the second detection region, and the The second overlapping area, which is an area on the side close to the first infrared detector, and the imaging area overlap,
    The drive unit is configured to change the direction of the imaging direction, the first detection direction, and the second detection direction to a first separation direction in which the first infrared detection unit and the second infrared detection unit are separated from each other. Along with it,
    The drive processing is performed by the drive unit in the direction in which a detection unit that has obtained a stronger infrared detection intensity is arranged among the detection units of the first infrared detection unit and the second infrared detection unit. The iris authentication apparatus according to claim 1, wherein the iris authentication apparatus is a process of changing a direction, the first detection direction, and the second detection direction.
  3. 　前記撮像部は、前記第一赤外線検出部と前記第二赤外線検出部との間に配置されている請求項２記載の虹彩認証装置。 The iris authentication apparatus according to claim 2, wherein the imaging unit is disposed between the first infrared detection unit and the second infrared detection unit.
  4. 　前記撮像部は、
    　画像信号を生成する撮像素子と、
    　前記撮像素子に画像を結像する光学系とを含み、
    　前記駆動部は、前記駆動処理において、前記光学系の先端近傍に位置すると共に前記撮像方向及び前記第一離間方向に対して直交する回転軸回りに前記撮像部、前記第一赤外線検出部、及び前記第二赤外線検出部を旋回させることにより、前記撮像方向、前記第一検出方向、及び前記第二検出方向を変化させる請求項２又は３記載の虹彩認証装置。     The imaging unit
    An image sensor for generating an image signal;
    An optical system that forms an image on the image sensor,
    In the driving process, the driving unit is located in the vicinity of the tip of the optical system and around the rotation axis orthogonal to the imaging direction and the first separation direction, the imaging unit, the first infrared detection unit, and The iris authentication device according to claim 2 or 3, wherein the imaging direction, the first detection direction, and the second detection direction are changed by turning the second infrared detection unit.
  5. 　前記駆動制御部は、前記第一赤外線検出部及び前記第二赤外線検出部で検出された赤外線のうち少なくとも一方の強度が、予め設定された設定時間内に予め設定された判定強度を超えて変化した場合に前記駆動処理を実行する請求項２～４のいずれか１項に記載の虹彩認証装置。 In the drive control unit, the intensity of at least one of the infrared rays detected by the first infrared detection unit and the second infrared detection unit changes beyond a predetermined determination intensity within a preset set time. The iris authentication apparatus according to any one of claims 2 to 4, wherein the driving process is executed in the event of a failure.
  6. 　前記赤外線検出部は、
    　前記赤外線を検出する方向に指向性を有し、その指向性に応じた第三検出方向に対して前記赤外線が検出される第三検出領域を有する第三赤外線検出部と、
    　前記第三赤外線検出部とは、前記第一離間方向及び前記撮像方向と直交する第二離間方向に離間して配置され、前記赤外線を検出する方向に指向性を有し、その指向性に応じた第四検出方向に対して前記赤外線が検出される第四検出領域を有する第四赤外線検出部とを含み、
    　前記第三検出領域の一部の領域であって、かつ前記第四赤外線検出部に近い側の領域である第三重複領域と、前記第四検出領域の一部の領域であって、かつ前記第三赤外線検出部に近い側の領域である第四重複領域と、前記撮像領域とが重複し、
    　前記駆動部は、さらに、前記撮像方向、前記第一、前記第二、前記第三、及び前記第四検出方向の向きを、前記第二離間方向に沿って一体に変化させ、
    　前記駆動制御部は、前記駆動処理において、さらに、前記第三赤外線検出部及び前記第四赤外線検出部の両検出部のうち、より強い赤外線の検出強度が得られた検出部が配置された方向へ、前記駆動部によって前記撮像方向、前記第一、前記第二、前記第三、及び前記第四検出方向を変化させる請求項２～５のいずれか１項に記載の虹彩認証装置。     The infrared detector is
    A third infrared detection unit having directivity in the direction in which the infrared is detected and having a third detection region in which the infrared is detected with respect to a third detection direction according to the directivity;
    The third infrared detection unit is arranged to be separated in the first separation direction and the second separation direction orthogonal to the imaging direction, and has directivity in the direction of detecting the infrared rays, and according to the directivity And a fourth infrared detection unit having a fourth detection region in which the infrared ray is detected with respect to the fourth detection direction,
    A third overlapping region that is a partial region of the third detection region and is a region closer to the fourth infrared detector; a partial region of the fourth detection region; and A fourth overlapping region that is a region closer to the third infrared detector, and the imaging region overlaps,
    The drive unit further changes the direction of the imaging direction, the first, the second, the third, and the fourth detection direction integrally along the second separation direction,
    In the driving process, the drive control unit is further arranged in a direction in which a detection unit that has obtained a stronger infrared detection intensity is arranged among the detection units of the third infrared detection unit and the fourth infrared detection unit. 6. The iris authentication apparatus according to claim 2, wherein the driving unit changes the imaging direction, the first, the second, the third, and the fourth detection direction.
  7. 　前記撮像部は、前記第三赤外線検出部と前記第四赤外線検出部との間に配置されている請求項６記載の虹彩認証装置。 The iris authentication apparatus according to claim 6, wherein the imaging unit is disposed between the third infrared detection unit and the fourth infrared detection unit.
  8. 　前記撮像部の前記撮像方向へ赤外線を照射する赤外線照明部をさらに備え、
    　前記撮像部は、赤外線画像を撮像する請求項１～７のいずれか１項に記載の虹彩認証装置。     An infrared illumination unit that emits infrared rays in the imaging direction of the imaging unit;
    The iris authentication apparatus according to any one of claims 1 to 7, wherein the imaging unit captures an infrared image.
  9. 　請求項１～８のいずれか１項に記載の虹彩認証装置と、
    　前記撮像部、前記赤外線検出部、及び前記駆動部が取り付けられた板状の扉とを含む虹彩認証システム。     The iris authentication device according to any one of claims 1 to 8,
    An iris authentication system including the imaging unit, the infrared detection unit, and a plate-like door to which the driving unit is attached.
  10. 　前記第一離間方向は、前記扉の上下方向に沿う方向である請求項９記載の虹彩認証システム。 The iris authentication system according to claim 9, wherein the first separation direction is a direction along a vertical direction of the door.
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