WO2020255244A1 - 撮像システム、撮像方法、制御装置、コンピュータプログラム及び記録媒体 - Google Patents

撮像システム、撮像方法、制御装置、コンピュータプログラム及び記録媒体 Download PDF

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Publication number
WO2020255244A1
WO2020255244A1 PCT/JP2019/024068 JP2019024068W WO2020255244A1 WO 2020255244 A1 WO2020255244 A1 WO 2020255244A1 JP 2019024068 W JP2019024068 W JP 2019024068W WO 2020255244 A1 WO2020255244 A1 WO 2020255244A1
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WIPO (PCT)
Prior art keywords
imaging
point
image
iris
state
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Ceased
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PCT/JP2019/024068
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English (en)
French (fr)
Japanese (ja)
Inventor
有加 荻野
慶一 蝶野
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NEC Corp
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NEC Corp
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Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to US17/619,769 priority Critical patent/US11997377B2/en
Priority to JP2021528091A priority patent/JP7226549B2/ja
Priority to PCT/JP2019/024068 priority patent/WO2020255244A1/ja
Priority to EP19933805.4A priority patent/EP3989532B1/en
Priority to CN201980097552.XA priority patent/CN113966607B/zh
Publication of WO2020255244A1 publication Critical patent/WO2020255244A1/ja
Anticipated expiration legal-status Critical
Priority to JP2022192948A priority patent/JP7567894B2/ja
Priority to US18/638,867 priority patent/US12348853B2/en
Ceased legal-status Critical Current

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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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
    • A61B5/1113—Local tracking of patients, e.g. in a hospital or private home
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B19/00—Cameras
    • G03B19/02—Still-picture cameras
    • G03B19/04—Roll-film cameras
    • G03B19/07—Roll-film cameras having more than one objective
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/16—Human faces, e.g. facial parts, sketches or expressions
    • G06V40/161—Detection; Localisation; Normalisation
    • G06V40/166—Detection; Localisation; Normalisation using acquisition arrangements
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/18—Eye characteristics, e.g. of the iris
    • G06V40/19—Sensors therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/45—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
    • 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
    • H04N23/61—Control of cameras or camera modules based on recognised objects
    • H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
    • 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
    • H04N23/667—Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
    • 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
    • H04N23/67—Focus control based on electronic image sensor signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30196—Human being; Person
    • G06T2207/30201—Face

Definitions

  • the present invention relates to the technical fields of an imaging system, an imaging method, a control device, a computer program, and a recording medium capable of imaging an imaging target.
  • Patent Document 1 describes a walk-through type iris recognition system that enables iris recognition even when the subject does not stand still.
  • Patent Document 1 includes a wide-angle camera and a plurality of iris cameras, and an iris recognition system that selects an iris camera to be used for authentication from a plurality of iris cameras by processing images of the wide-angle cameras. Is described.
  • the iris authentication system described in Patent Document 1 has a technical problem that it may not be possible to properly image a moving target person using an iris camera.
  • an iris authentication system with a wide-angle camera and multiple iris cameras selects the iris camera to be used for authentication before the moving subject reaches the in-focus position of the iris camera (further). Need to set the parameters of the selected iris camera as needed). Therefore, the iris recognition system is an iris camera that should be used for authentication based on the image of the wide-angle camera by imaging the subject with a wide-angle camera before the moving subject reaches the in-focus position of the iris camera. It is desirable to select.
  • Patent Document 1 does not consider this point at all.
  • An object of the present invention is to provide an imaging system, an imaging method, a control device, a computer program, and a recording medium capable of solving the above-mentioned technical problems.
  • the first aspect of the imaging system for solving the problem is that the first imaging device that images the imaging object located at the first point and the image pickup target are located on the back side of the first point in the moving direction of the imaging object. Based on the second image pickup device whose focusing position is set at the second point and the image captured by the first image pickup device, the second image pickup is performed so as to image the image pickup target located at the second point. It is provided with a control device for controlling the device.
  • the second aspect of the imaging system for solving the problem is that the state can be switched between the first state and the second state, and in the first state, the imaging target located at the first point is captured.
  • An image pickup device in which an image is taken and a focusing position is set at a second point located farther in the moving direction of the image pickup target than the first point, and the first state.
  • An imaging system including a control device that controls the imaging device in the second state so as to image the imaging target located at the second point based on the image captured by the imaging device.
  • the first aspect of the imaging method for solving the problem is an acquisition step of acquiring an image captured by a first imaging device that images an imaging target located at a first point, and an image acquired in the acquisition step. Based on this, the focusing position is set at the second point so as to image the image pickup target located at the second point located on the back side in the moving direction of the image pickup target from the first point. 2 It includes a control process for controlling the imaging device.
  • the second aspect of the imaging method for solving the problem is that the state can be switched between the first state and the second state, and in the first state, the imaging target located at the first point is captured.
  • the image pickup device that images an image pickup target located at a second point located behind the first point in the moving direction of the image pickup target is in the first state.
  • Control to switch the image pickup device from the first state to the second state by controlling the image pickup device based on the acquisition step of acquiring the image captured by the image pickup device and the image acquired in the acquisition step. It has a process.
  • the first aspect of the control device for solving the problem is based on an acquisition means for acquiring an image captured by a first imaging device that captures an image pickup target located at a first point and an image acquired by the acquisition means.
  • the focus position is set at the second point so as to image the image pickup target located at the second point located on the back side in the moving direction of the image pickup target from the first point. 2
  • the control means for controlling the image pickup apparatus is provided.
  • the second aspect of the control device for solving the problem is that the state can be switched between the first state and the second state, and in the first state, the image pickup target located at the first point is captured.
  • the image pickup device in the first state is obtained from an image pickup apparatus that takes an image and images an image pickup target located at a second point located behind the first point in the moving direction of the image pickup target in the second state.
  • a control means for switching the image pickup device from the first state to the second state by controlling the acquisition means for acquiring the image captured by the image pickup device and the image pickup device based on the image acquired by the acquisition means. And.
  • One aspect of the computer program for solving the problem is to have the computer execute the first or second aspect of the above-mentioned imaging method.
  • One aspect of the recording medium for solving the problem is a recording medium on which one aspect of the computer program described above is recorded.
  • a moving imaging target can be appropriately imaged.
  • FIG. 1 is a block diagram showing an overall configuration of the iris authentication system of the present embodiment.
  • FIG. 2 is a schematic view showing the positional relationship between the entire camera and the iris camera and the person to be authenticated.
  • FIG. 3 is a block diagram showing a hardware configuration of the iris recognition device of the present embodiment.
  • FIG. 4 is a block diagram showing a functional block realized in the CPU included in the iris authentication device of the present embodiment.
  • FIG. 5 is a flowchart showing the flow of the operation of the iris authentication system of the present embodiment (that is, the iris authentication operation).
  • FIG. 6 is a plan view showing an example of the entire image.
  • FIG. 7 is a plan view showing an example of the entire image.
  • FIG. 6 is a plan view showing an example of the entire image.
  • FIG. 8 is a plan view showing the relationship between the entire image and the plurality of iris images.
  • FIG. 9 is a block diagram showing the overall configuration of the iris recognition system of the first modification.
  • FIG. 10 is a flowchart showing the flow of the operation (that is, the iris authentication operation) of the iris authentication system of the first modification.
  • FIG. 11 is a block diagram showing a modified example of the functional block realized in the CPU included in the iris recognition device.
  • the iris recognition system 1 executes an iris recognition operation that authenticates the authentication target person T based on the iris pattern of the authentication target person T (for example, a human), which is an example of the image pickup target.
  • a human for example, a human
  • Such an iris recognition system 1 may be adopted as a part of, for example, a system for automating immigration procedures at an airport (so-called ABC (Automated Border Control)).
  • the iris recognition system 1 may be a walk-through type iris recognition system that authenticates the moving authentication target person T.
  • the description will proceed using an example in which the iris authentication system 1 is a walk-through type iris authentication system.
  • the iris recognition system 1 is not limited to the iris recognition system exemplified in this paragraph, and the iris recognition system 1 is used as an arbitrary iris recognition system capable of authenticating the authentication target person T. May be good.
  • the iris recognition system 1 is a specific example of the "imaging system" in the appendix described later.
  • FIG. 1 is a block diagram showing an overall configuration of the iris authentication system 1 of the present embodiment.
  • the iris recognition system 1 is a specific example of the overall camera 2 which is a specific example of the “first imaging device” described later, and a specific example of the “second imaging device” which will be described later. It is provided with a plurality of iris cameras 3 and an iris recognition device 6 which is a specific example of the “control device” described later.
  • the iris recognition system 1 further includes a motion sensor 4 which is a specific example of the "first detection device” described later, and a motion sensor 5 which is a specific example of the "second detection device” described later. May be provided.
  • FIG. 1 shows an example in which the iris authentication system 1 includes n (where n is an integer of 2 or more) iris cameras 3.
  • n iris cameras 3 will be referred to as iris camera 3-1, iris camera 3-2, ..., And iris camera 3-n, respectively, as necessary.
  • the number of iris cameras 3 may be appropriately set according to the characteristics of each iris camera 3 (for example, at least one such as the viewing range of each iris camera 3 and the resolution of each iris camera 3).
  • FIG. 2 is a schematic view showing the positional relationship between the entire camera 2 and the plurality of iris cameras 3 and the authentication target person T.
  • the overall camera 2 images the authentication target person T in a field of view wider than the field of view of each iris camera 3. That is, the field of view of the entire camera 2 is wider than the field of view of each iris camera 3.
  • the field of view of the entire camera 2 is set to an appropriate range so that the entire camera 2 can take an image of the authentication target person T regardless of the height of the authentication target person T. That is, the field of view of the entire camera 2 is set to an appropriate range so that the entire camera 2 can image the relatively tall authentication target person T and also the relatively short authentication target person T. ing.
  • the field of view of the entire camera 2 is such that the overall camera 2 uses the target portion TP (iris in the present embodiment) used for authentication among the authentication target persons T regardless of the height of the authentication target person T. It is set in an appropriate range so that it can image (eyes including).
  • the "camera field of view range” in the present embodiment means a range including a scene that can be captured by the camera, and may be referred to as an imaging range.
  • the size of such a field of view typically increases as the angle of view (in other words, the viewing angle) of the camera increases. Therefore, typically, the optical system (for example, a lens) of the entire camera 2 has a wider angle than the optical system of each iris camera 3. That is, the angle of view of the entire camera 2 is wider than the angle of view of each iris camera 3. Further, the angle of view of the camera typically increases as the focal length of the optical system (for example, a lens) included in the camera becomes shorter. Therefore, typically, the focal length of the optical system of the entire camera 2 is shorter than the focal length of the optical system of each iris camera 3.
  • the overall camera 2 captures the authentication target person T located at the trigger point P1. That is, the field of view of the entire camera 2 is set to an appropriate field of view so that the entire camera 2 can image the authentication target person T located at the trigger point P1.
  • the trigger point P1 is a point located on the movement path of the authentication target person T. Further, the trigger point P1 is a point located on the front side of the reference point P0 when viewed from the authentication target person T moving toward the trigger point P1. That is, the trigger point P1 is a point located on the front side (that is, the rear side) in the moving direction of the authentication target person T from the reference point P0.
  • the trigger point P1 is a point separated from the reference point P0 by a distance D1 along the moving direction of the authentication target person T.
  • the reference point P0 may be, for example, a point where each iris camera 3 is installed.
  • the reference point P0 may be, for example, the destination of the moving authentication target person T.
  • the destination may be, for example, a point through which the certification target person T passes after certification (for example, a point where an airport gate is installed).
  • the authentication target person T is moving from the left side to the right side of the paper. Therefore, in the example shown in FIG. 2, the trigger point P1 is a point separated from the reference point P0 by a distance D1 toward the left side of the paper.
  • the authentication target person T may move along a linear path in which the moving direction is always the same, or along a path in which the moving direction changes in the middle (for example, a curved path or a bent path). You may move.
  • the overall camera 2 is arranged so that the focusing position of the overall camera 2 is located at the trigger point P1.
  • the "focus position" in the present embodiment is a certain area extending before and after the best focus position (for example, an area that can be regarded as being in focus and corresponds to the depth of field). Shall mean.
  • the overall camera 2 is arranged so that the focusing position of the overall camera 2 is a region including the trigger point P1 (that is, the trigger point P1 is located in the region corresponding to the focusing position). Is preferable.
  • the trigger point P1 is set at the in-focus position of the entire camera 2.
  • the whole camera 2 has a resolution enough to identify the face of the authentication target person T located at the trigger point P1 from the whole image 200 which is an image captured by the whole camera 2.
  • the overall camera 2 has a resolution such that the target portion TP (that is, the eye) of the authentication target person T located at the trigger point P1 can be identified from the overall image 200 where in the overall image 200. have.
  • each iris camera 3 captures the authentication target person T located at the focus point P2. That is, the field of view of each iris camera 3 is set to an appropriate field of view so that each iris camera 3 can image the authentication target person T located at the focus point P2.
  • the focus point P2 is a point located on the movement path of the authentication target person T, similarly to the trigger point P1. Further, the focus point P2 is a point located on the front side of the reference point P0 when viewed from the authentication target person T moving toward the focus point P2, similarly to the trigger point P1. That is, the focus point P2 is a point located on the front side (that is, the rear side) in the moving direction of the authentication target person T from the reference point P0.
  • the focus point P2 is a point separated from the reference point P0 by a distance D2 along the moving direction of the authentication target person T.
  • the authentication target person T is moving from the left side to the right side of the paper. Therefore, in the example shown in FIG. 2, the focus point P2 is a point separated from the reference point P0 toward the left side of the paper by a distance D2.
  • the distance D2 between the focus point P2 and the reference point P0 is shorter than the distance D1 between the trigger point P1 and the reference point P0. Therefore, the focus point P2 is located on the back side (that is, the front side) in the moving direction of the authentication target person T from the trigger point P1. In other words, the trigger point P1 is located on the front side (that is, the rear side) in the moving direction of the authentication target person T from the focus point P2. Therefore, the moving authentication target person T passes through the focus point P2 after passing through the trigger point P1. In other words, the moving authentication target person T passes through the trigger point P1 before passing through the focus point P2.
  • the distances D1 and D2 may be set to any value as long as the relationship that the distance D2 is shorter than the distance D1 is satisfied. As an example, the distances D1 and D2 may be set to 3 m and 2 m, respectively.
  • Each iris camera 3 is arranged so that the focusing position of each iris camera 3 is located at the focus point P2. Specifically, each iris camera 3 is arranged so that the in-focus position of each iris camera 3 is an area including the focus point P2 (that is, the focus point P2 is located in the area corresponding to the in-focus position). It can be said that it will be done. Conversely, the focus point P2 is set at the in-focus position of each iris camera 3. As described above, the angle of view of the entire camera 2 is wider than the angle of view of each iris camera 3 (that is, the focal length of the optical system of the entire camera 2 is shorter than the focal length of the optical system of each iris camera 3). Therefore, the area corresponding to the in-focus position of the entire camera 2 is wider than the area corresponding to the in-focus position of each iris camera 3.
  • the plurality of iris cameras 3 are arranged so that the viewing ranges of the plurality of iris cameras 3 partially overlap in the vertical direction (or a desired direction different from the vertical direction) at the focus point P2.
  • the plurality of iris cameras 3 are the lower end of the field of view of the iris camera 3-k (where k is an integer satisfying 1 ⁇ k ⁇ n) and the iris camera 3-m at the focus point P2.
  • the same scene is partially reflected in the two images captured by the two iris cameras 3 whose field of view partially overlap.
  • the same scene is reflected in the lower end of the image captured by the iris camera 3-k and the upper end of the image captured by the iris camera 3-m.
  • the plurality of iris cameras 3 are arranged so that the combined visual field range obtained by synthesizing the visual field ranges of the plurality of iris cameras 3 has a predetermined horizontal length in the horizontal direction and a predetermined vertical length in the vertical direction. ..
  • the predetermined horizontal length may be a length (for example, 0.2 m) that can include the target site TP of the authentication target person T located at the focus point P2 in the synthetic visual field range.
  • the predetermined vertical length is a length that can include the target site TP of the authentication target person T located at the focus point P2 in the synthetic visual field range regardless of the height of the authentication target person T (for example, 0.4 m). ) May be.
  • Each iris camera 3 has a resolution capable of identifying the target portion TP of the authentication target person T located at the focus point P2 from the iris image 300 which is an image captured by each iris camera 3.
  • each iris camera 3 has a resolution sufficient to identify the iris pattern of the authentication target T located at the focus point P2 from the iris image 300, which is an image captured by each iris camera 3. There is.
  • the field of view of the entire camera 2 partially overlaps with at least one of the field of view of the plurality of iris cameras 3.
  • both the authentication target person T (particularly the target site TP) located at the trigger point P1 and the authentication target person T (particularly the target site TP) located at the focus point P2 are included in the field of view of the entire camera 2.
  • both the authentication target person T (particularly the target site TP) located at the trigger point P1 and the authentication target person T (particularly the target site TP) located at the focus point P2 are included in the field of view of each iris camera 3. It may be.
  • the field of view of the entire camera 2 does not have to overlap with the field of view of each of the plurality of iris cameras 3.
  • the authentication target person T (particularly the target part TP) located at the trigger point P1 is included in the field of view of the entire camera 2, while the authentication target person T (particularly the target part TP) located at the focus point P2 is included. It does not have to be included in the field of view of the entire camera 2.
  • the authentication target person T (particularly the target site TP) located at the focus point P2 is included in the field of view of each iris camera 3, while the authentication target person T (particularly the target site TP) located at the trigger point P1. Does not have to be included in the field of view of each iris camera 3.
  • the motion sensor 4 is a detection device for detecting whether or not the authentication target person T is located at the trigger point P1.
  • the detection result of the motion sensor 4 is output to the iris authentication device 6.
  • the detection result of the motion sensor 4 is used as a condition for determining whether or not the entire camera 2 captures the authentication target person T located at the trigger point P1.
  • the motion sensor 5 is a detection device for detecting whether or not the authentication target person T is located at the focus point P2.
  • the detection result of the motion sensor 5 is output to the iris authentication device 6.
  • the detection result of the motion sensor 5 is used as a condition for determining whether or not the iris camera 3 images the authentication target person T located at the focus point P2.
  • the iris authentication device 6 controls the overall operation of the iris authentication system 1.
  • the iris recognition device 6 executes the iris recognition operation.
  • the iris recognition operation for example, one iris camera 3 for photographing the authentication target person T located at the focus point P2 is selected from the plurality of iris cameras 3 based on the whole image 200 captured by the whole camera 2. This is an operation including a process of performing the process and a process of authenticating the authentication target person T based on the iris image 300 captured by the selected one iris camera 3.
  • the configuration of the iris authentication device 6 that executes such an iris authentication operation will be described in more detail.
  • FIG. 3 is a block diagram showing a hardware configuration of the iris recognition device 6 of the present embodiment.
  • the iris recognition device 6 includes a CPU (Central Processing Unit) 61, a RAM (Random Access Memory) 62, a ROM (Read Only Memory) 63, a storage device 64, an input device 65, and the like. It includes an output device 66.
  • the CPU 61, the RAM 62, the ROM 63, the storage device 64, the input device 65, and the output device 66 are connected via the data bus 67.
  • the iris recognition device 6 does not have to include at least one of a RAM 62, a ROM 63, a storage device 64, an input device 65, an output device 66, and a data bus 67.
  • the CPU 61 reads a computer program.
  • the CPU 61 may read a computer program stored in at least one of the RAM 62, the ROM 63, and the storage device 64.
  • the CPU 61 may read a computer program stored in a computer-readable recording medium using a recording medium reading device (not shown).
  • the CPU 61 may acquire (that is, may read) a computer program from a device (not shown) arranged outside the iris recognition device 6 via a network interface.
  • the CPU 61 controls the RAM 62, the storage device 64, the input device 65, and the output device 66 by executing the read computer program.
  • a logical functional block for executing the iris authentication operation is realized in the CPU 61. That is, the CPU 61 can function as a controller for realizing a logical functional block for executing the iris authentication operation.
  • FIG. 4 shows an example of a logical functional block realized in the CPU 61 to perform the iris authentication operation.
  • an image acquisition unit 611 which is a specific example of the "acquisition means” in the appendix described later, and an appendix described later.
  • the coordinate estimation unit 613 which is a specific example of the "control means” in the appendix described later, and a specific example of the "control means” in the appendix described later.
  • a certain camera setting unit 614, an image pickup control unit 615, which is a specific example of the "control means” described later, and an authentication unit 616 are realized.
  • the operations of the image acquisition unit 611, the area detection unit 612, the coordinate estimation unit 613, the camera setting unit 614, the image pickup control unit 615, and the authentication unit 616 will be described in detail later with reference to FIG. The detailed description here will be omitted.
  • the RAM 62 temporarily stores the computer program executed by the CPU 61.
  • the RAM 62 temporarily stores data temporarily used by the CPU 61 when the CPU 61 is executing a computer program.
  • the RAM 62 may be, for example, a D-RAM (Dynamic RAM).
  • the ROM 63 stores a computer program executed by the CPU 61.
  • the ROM 63 may also store fixed data.
  • the ROM 63 may be, for example, a P-ROM (Programmable ROM).
  • the storage device 64 stores data stored by the iris recognition device 6 for a long period of time.
  • the storage device 64 may operate as a temporary storage device of the CPU 61.
  • the storage device 64 may include, for example, at least one of a hard disk device, a magneto-optical disk device, an SSD (Solid State Drive), and a disk array device.
  • the input device 65 is a device that receives an input instruction from the user of the iris authentication device 6.
  • the input device 65 may include, for example, at least one of a keyboard, a mouse and a touch panel.
  • the output device 66 is a device that outputs information about the iris authentication device 6 to the outside.
  • the output device 66 may be a display device capable of displaying information about the iris recognition device 6.
  • FIG. 5 is a flowchart showing the flow of the operation (that is, the iris authentication operation) of the iris authentication system 1 of the present embodiment.
  • the image pickup control unit 615 determines whether or not the authentication target person T is located at the trigger point P1 based on the detection result of the motion sensor 4 (step S11). As a result of the determination in step S11, if it is determined that the authentication target person T is not located at the trigger point P1 (step S11: No), the process of step S11 is repeated. On the other hand, if it is determined that the authentication target person T is located at the trigger point P1 as a result of the determination in step S11 (step S11: Yes), the image pickup control unit 615 is located at the trigger point P1.
  • the entire camera 2 is controlled so as to capture the authentication target person T (step S12). As a result, the whole camera 2 takes an image of the authentication target person T located at the trigger point P1 (step S12).
  • the entire image 200 captured by the overall camera 2 is acquired by the image acquisition unit 611 (step S12).
  • the area detection unit 612 performs image processing on the entire image 200 acquired in step S12, and detects the image portion of the entire image 200 in which the target portion TP is reflected as the target area TA. (Step S21).
  • the region detection unit 612 has a rectangular shape (or a rectangular shape) in which the target portion TP is reflected in the entire image 200. The image portion (of other shapes) is detected as the target region TA. Further, the area detection unit 612 calculates the position coordinates C in the entire image 200 of the detected target area TA (step S21).
  • the position coordinate C may include the coordinates of a desired portion (for example, a corner portion) of the target region TA.
  • the position coordinate C is typically a two-dimensional coordinate (or a two-dimensional vector).
  • position coordinate C (overall: P1)".
  • the coordinate estimation unit 613 assumed that the entire camera 2 imaged the same authentication target person T located at the focus point P2 based on the position coordinates C (overall: P1) of the target region TA calculated in step S21.
  • the position coordinates C of the target region TA in the entire image 200 acquired in the case are estimated (step S22). More specifically, the coordinate estimation unit 613 within the entire image 200, which is assumed to be acquired when it is assumed that the entire camera 2 captures the authentication target person T who has moved from the trigger point P1 to the focus point P2.
  • the position coordinates C of the target region TA of the above are estimated (step S22).
  • step S22 the position coordinates C of the target region TA in the entire image 200, which is assumed to be acquired in this case, are estimated (step S22).
  • position coordinate C all: P2
  • the whole image 200 actually acquired by the whole camera 2 taking an image of the authentication target person T located at the trigger point P1 is referred to as "the whole image 200 (P1)".
  • the entire image 200 that is assumed to be acquired when it is assumed that the entire camera 2 captures the authentication target person T that has moved from the trigger point P1 to the focus point P2 is referred to as "overall image 200 (P2)".
  • the two are distinguished by the name.
  • the authentication target in the whole image 200 (P1) is likely to be different from at least one of the size and position of the person T to be authenticated in the overall image 200 (P2).
  • the coordinate estimation unit 613 is the first correspondence showing the correspondence (typically, the positional relationship) between the object reflected in the whole image 200 (P1) and the same object reflected in the whole image 200 (P2).
  • the position coordinate C (whole: P2) may be estimated from the position coordinate C (whole: P1) using the information.
  • Such first correspondence information typically includes the position coordinates of the object reflected in the overall image 200 (P1) in the overall image 200 (P1) and the focus point P2 from the trigger point P1 to the object.
  • Correspondence with the position coordinates in the whole image 200 (P2) of the same object reflected in the whole image 200 (P2) which is supposed to be acquired when moving toward the authentication target person T in the same way. Show the relationship.
  • the first correspondence information is substantially information that reflects the movement mode of the authentication target person T (for example, the movement direction of the authentication target person T). That is, the first correspondence information substantially includes information regarding the movement mode of the authentication target person T (for example, the movement direction of the authentication target person T).
  • the first correspondence information is the same as the whole image 200 acquired by the whole camera 2 actually capturing the object located at the trigger point P1 and the authentication target person T from the trigger point P1 to the focus point P2. It may be calculated in advance (for example, before the iris recognition operation is executed) based on the whole image 200 acquired by the whole camera 2 actually capturing the same moved object. Specifically, the first correspondence information is calculated based on the position coordinates in the whole image 200 of the object located at the trigger point P1 and the position coordinates in the whole image 200 of the object located at the focus point P2. It may have been done.
  • the first correspondence information includes an overall image 200 that is assumed to be acquired when the entire camera 2 captures an object located at the trigger point P1, and the authentication target person T from the trigger point P1 toward the focus point P2.
  • the entire image 200 which is assumed to be acquired when the entire camera 2 captures the moving object in the same manner as above, is calculated by simulation or the like, and even if it is calculated in advance based on the result of the simulation. Good.
  • At the time of simulation at least one of the position of the whole camera 2, the camera parameter of the whole camera 2, the position of the trigger point P1 and the position of the focus point P2 may be taken into consideration.
  • the first correspondence information may be calculated by any other method.
  • a first transformation matrix H1 may be, for example, a matrix representing a projective transformation that projects an object located at the trigger point P1 onto a virtual surface located at the focus point P2.
  • step S23 when the coordinate estimation unit 613 assumes that the same authentication target person T located at the focus point P2 is imaged by the plurality of iris cameras 3 based on the position coordinates C (overall: P2) estimated in step S22.
  • the position coordinates C of the target region TA in the plurality of iris images 300 acquired respectively are estimated (step S23). More specifically, the coordinate estimation unit 613 is assumed to be acquired by the plurality of iris cameras 3 assuming that the authentication target person T that has moved from the trigger point P1 to the focus point P2 is imaged.
  • the position coordinates C of the target region TA in the iris image 300 are estimated (step S23).
  • the coordinate estimation unit 613 said that the plurality of iris cameras 3 imaged the authentication target person T located at the focus point P2 while the authentication target person T located at the trigger point P1 moved to the focus point P2.
  • the position coordinates C of the target region TA in the plurality of iris images 300 which are assumed to be acquired in each case, are estimated (step S23).
  • the position coordinate C estimated in step S23 is referred to as "position coordinate C (iris: P2)".
  • the iris image 300 which is assumed to be acquired when it is assumed that each iris camera 3 captures the authentication target person T who has moved from the trigger point P1 to the focus point P2. It is called “iris image 300 (P2)".
  • the target region TA reflected in the overall image 200 (P2) is the plurality of iris images 300 (P2). It is not always reflected in all of. That is, the plurality of iris images 300 (P2) may include both the iris image 300 (P2) in which the target region TA is reflected and the iris image 300 (P2) in which the target region TA is not reflected. is there. In the example shown in FIG.
  • the target region TA is reflected in the iris image 300 (P2) -1 which is supposed to be captured by the iris camera 3-1 while the iris cameras 3-2 to 3-n are captured, respectively.
  • the iris images 300 (P2) -2 to 300 (P2) -n, which are supposed to be captured, are not reflected. Therefore, in step S23, the coordinate estimation unit 613 specifies the iris image 300 (P2) in which the target region TA is assumed to be reflected based on the position coordinates C (overall: P2), and the specified iris image.
  • the position coordinate C (iris: P2) of the target region TA within 300 (P2) is estimated.
  • the coordinate estimation unit 613 determines the correspondence (typically, the positional relationship) between the object reflected in the entire image 200 (P2) and the same object reflected in each of the plurality of iris images 300 (P2).
  • the position coordinate C (iris: P2) may be estimated from the position coordinate C (overall: P2) using the second correspondence information shown.
  • Such second correspondence information is typically the position coordinates in the whole image 200 (P2) of the object reflected in the whole image 200 (P2) and each of the plurality of iris images 300 (P2).
  • the correspondence with the position coordinates in the iris image 300 (P2) of the same object reflected in is shown.
  • the second correspondence information is the entire image 200 acquired by the entire camera 2 actually capturing the object located at the focus point P2, and the plurality of iris cameras 3 actually capturing the same object located at the focus point P2. It may be calculated in advance (that is, before the iris recognition operation is executed) based on the plurality of iris images 300 acquired by each of the above. Specifically, even if the second correspondence information is calculated based on the position coordinates of the object at the focus point P2 in the entire image 200 and the position coordinates of the object at the focus point P2 in the iris image 300. Good.
  • the corresponding information includes the entire image 200, which is assumed to be acquired when the entire camera 2 captures the object located at the focus point P2, and the plurality of iris cameras 3 capture the same object located at the focus point P2.
  • a plurality of iris images 300 which are expected to be acquired in each case, may be calculated by simulation or the like, and may be calculated in advance based on the result of the simulation.
  • At the time of simulation at least one of the position of the whole camera 2, the camera parameter of the whole camera 2, the position of the plurality of iris cameras 3, the camera parameters of the plurality of iris cameras 3, the position of the trigger point P1 and the position of the focus point P2.
  • the second correspondence information may be calculated by any other method.
  • the camera setting unit 614 is for imaging the authentication target person T located at the focus point P2 from among the plurality of iris cameras 3 based on the position coordinates C (iris: P2) estimated in step S23.
  • One iris camera 3 is selected (step S31). Specifically, as described above, the coordinate estimation unit 613 identifies the iris image 300 (P2) in which the target region TA is reflected, based on the position coordinates C (overall: P2). Therefore, the camera setting unit 614 captures the authentication target person T located at the focus point P2 with the iris camera 3 corresponding to the iris image 300 (P2) in which the target region TA is reflected among the plurality of iris cameras 3. Select as one iris camera 3 for. In the example shown in FIG. 8, the camera setting unit 614 is one iris camera for photographing the authentication target person T located at the focus point P2 with the iris camera 3-1 corresponding to the iris image 300 (P2) -1. Select as 3.
  • the camera setting unit 614 defines an image portion actually acquired (that is, read out) in order to perform iris recognition among the iris images 300 captured by the one iris camera 3 selected in step S31.
  • the gaze area (ROI: Region of Interest) IA is set (step S32). Specifically, as shown in FIG. 8, the camera setting unit 614 has a rectangular shape (for example, in which the target portion TP of the iris image 300 captured by the selected iris camera 3 is assumed to be captured. Alternatively, a region (of any other shape) is set in the gaze region IA. That is, as shown in FIG.
  • the camera setting unit 614 coincides with the target region TA including the target region TA in the iris image 300 captured by the selected one iris camera 3, or becomes the target region TA.
  • a rectangular (or other shaped) region that is supposed to be included is set as the gaze region IA.
  • the position coordinates C (overall: P2) estimated in step S23 indicate the position coordinates of the target region TA in the iris image 300 (P2). Since the target region TA includes the target region TP, the camera setting unit 614 can appropriately set the gaze region IA based on the position coordinates C (iris: P2). In the example shown in FIG. 8, the camera setting unit 614 sets a part of the iris image 300 (P2) -1 in the gaze area IA.
  • the iris recognition system 1 When the gaze area IA is set, the iris recognition system 1 operates in the gaze area mode.
  • the image acquisition unit 611 acquires the entire iris image 300 captured by the iris camera 3, and instead of acquiring the entire iris image 300, the image portion of the iris image 300 in the gaze area IA (that is, of the image data of the iris image 300). To get a part of). That is, the image acquisition unit 611 does not have to acquire the image portion (that is, the remaining part of the image data of the iris image 300) in the region other than the gaze region IA of the iris image 300.
  • the frame rate at which the image acquisition unit 611 acquires the iris image 300 from the iris camera 3 is substantially improved as compared with the case where the entire iris image 300 is acquired.
  • the frame rate is doubled as compared with the case of acquiring the entire iris image 300. Therefore, even if the frame rate of the iris camera 3 itself is less than the frame rate required for iris recognition, the image acquisition unit 611 can acquire the iris image 300 at the frame rate required for iris recognition. it can.
  • the image pickup control unit 615 determines whether or not the authentication target person T is located at the focus point P2 based on the detection result of the motion sensor 5 (step S41). That is, the image pickup control unit 615 determines whether or not the authentication target person T determined to be located at the trigger point P1 in step S11 has moved to the focus point P2 based on the detection result of the motion sensor 5. Determine (step S41). As a result of the determination in step S41, if it is determined that the authentication target person T is not located at the focus point P2 (step S41: No), the process of step S41 is repeated.
  • step S41 determines that the authentication target person T is located at the focus point P2 as a result of the determination in step S41 (step S41: Yes)
  • the image pickup control unit 615 is located at the focus point P2.
  • the one iris camera 3 selected in step S31 is controlled so as to image the authentication target person T (step S42).
  • the selected one iris camera 3 images the authentication target person T located at the focus point P2 (step S42).
  • the iris image 300 (particularly, the image portion in the gaze area IA of the iris image 300) captured by the selected iris camera 3 is acquired by the image acquisition unit 611 (step S42).
  • the authentication unit 616 performs iris authentication using the iris image 300 acquired in step S42 (step S51). For example, the authentication unit 616 identifies the iris pattern of the authentication target person T based on the iris image 300 acquired in step S42. After that, the authentication unit 616 determines whether or not the specified pattern matches the pattern registered in the database stored in the storage device 64 or the like. When the specified pattern matches the pattern registered in the database, the authentication unit 616 determines that the authentication target person T is a legitimate person. When the specified pattern matches the pattern registered in the database, the authentication unit 616 determines that the authentication target person T is not a legitimate person.
  • the iris recognition system 1 is different from the focus point P2 before the iris camera 3 images the authentication target person T located at the focus point P2 (specifically).
  • the whole camera 2 takes an image of the authentication target person T located at the trigger point P1 (in the foreground). Therefore, the iris recognition system 1 can select one iris camera 3 that captures the authentication target person T before the authentication target person T is located at the focus point P2.
  • the iris recognition system 1 uses the time it takes for the authentication target person T to move from the trigger point P1 to the focus point P2 to select one iris camera 3 that captures the authentication target person T (furthermore, gaze).
  • Area IA can be set). Therefore, the iris recognition system 1 can appropriately image the moving authentication target person T (particularly, the target site TP).
  • the iris recognition system 1 captures one iris that captures the authentication target person T based on the overall image 200 (P1) captured by the overall camera 2.
  • the camera 3 can be appropriately selected. This is because, in the iris authentication system 1, the entire camera 2 captures the authentication target person T who has moved to the focus point P2 from the position coordinates C (overall: P1) of the target area TA in the entire image 200 (P2).
  • the position coordinates C (whole: P2) of the target area TA in the whole image 200 (P2) that is supposed to be acquired in the assumed case are estimated, and then the authentication target person T who has moved to the focus point P2 is photographed by the iris camera. This is because the position coordinates C (iris: P2) of the target region TA in the iris image 300 (P2), which is assumed to be acquired when it is assumed that the image is taken by 3, is estimated.
  • the position coordinates C (whole: P1) and the position coordinates C (whole: P2) are different as shown in FIGS. 6 and 7 described above. As mentioned above, there is a high possibility that this will occur. Therefore, if the position coordinate C (whole: P1) is used as the position coordinate C (whole: P2) as it is, one iris camera 3 selected to image the authentication target person T is the target site TP. It may not be possible to properly image the image. That is, if the position coordinate C (whole: P1) is used as the position coordinate C (whole: P2) as it is, the camera setting unit 614 captures the target portion TP of the authentication target person T located at the focus point P2.
  • the position coordinates C (overall: P1) may be selected. After the position coordinates C (whole: P2) are estimated from, the position coordinates (iris: P2) are estimated. Therefore, as compared with the case where the position coordinate C (whole: P1) is used as it is as the position coordinate C (whole: P2), one iris camera 3 selected to image the authentication target person T is the target portion. The possibility that the TP cannot be properly imaged is reduced.
  • the process of estimating the position coordinate C (whole: P2) from the position coordinate C (whole: P1) is an appropriate selection of the iris camera 3 that images the target part TP of the authentication target person T located at the focus point P2. (That is, it can be said that it greatly contributes to (appropriate imaging of the target portion TP by the iris camera 3).
  • a plurality of motion sensors that is, motion sensors 4 and 5) corresponding to the trigger point P1 and the focus point P2 are installed. Therefore, the iris recognition system 1 can appropriately determine whether or not the authentication target person T is located at each of the trigger point P1 and the focus point P2. That is, the iris recognition system 1 can appropriately image the authentication target person T located at the trigger point P1 with the entire camera 2, and appropriately capture the authentication target person T located at the focus point P2 with the iris camera 3. It can be imaged.
  • FIG. 9 is a block diagram showing the overall configuration of the iris authentication system 1a of the first modification.
  • the same components as the components included in the above-mentioned iris authentication system 1 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the iris recognition system 1a differs from the iris recognition system 1 in that it includes a single common camera 7a instead of the overall camera 2 and the plurality of iris cameras 3. There is. Other features of the iris recognition system 1a may be the same as the other features of the iris recognition system 1.
  • the common camera 7a is an imaging device capable of photographing the authentication target person T, like the whole camera 2 and the plurality of iris cameras 3. Under the control of the iris authentication device 6, the common camera 7a has a state of a total image pickup capable of functioning as the whole camera 2 and an iris image pickup state capable of functioning as at least one of the plurality of iris cameras 3. It is possible to switch between.
  • the overall imaging state and the iris imaging state are specific examples of the "first state" and the "second state" in the appendix described later, respectively.
  • the common camera 7a in the overall imaging state is substantially equivalent to the overall camera 2 described above. That is, the common camera 7a in the overall imaging state operates in the same manner as the overall camera 2 described above. Therefore, the characteristics of the common camera 7a in the overall imaging state may be the same as those of the overall camera 2 described above, and detailed description thereof will be omitted.
  • the common camera 7a in the iris imaging state is substantially equivalent to at least one of the plurality of iris cameras 3 described above. That is, the common camera 7a in the iris imaging state operates in the same manner as at least one of the plurality of iris cameras 3 described above. Therefore, the characteristics of the common camera 7a in the iris imaging state may be the same as at least one of the plurality of iris cameras 3 described above, and detailed description thereof will be omitted.
  • the field of view of the common camera 7a in the iris imaging state is typically the same as the combined field of view (see FIG. 2) in which the field ranges of the plurality of iris cameras 3 are combined. Therefore, the common camera 7a in the iris imaging state is substantially equivalent to the above-mentioned plurality of iris cameras 3 regarded as a single camera.
  • the common camera 7a may include, for example, an optical system having variable optical characteristics (for example, focal length).
  • the focal length of the optical system of the common camera 7a in the overall imaging state is shorter than the focal length of the optical system of the common camera 7a in the iris imaging state.
  • the common camera 7a can function as the entire camera 2 and at least one of the plurality of iris cameras 3.
  • the common camera 7a may include an optical system including a so-called zoom lens.
  • the focal length of the optical system including the zoom lens is set to a relatively short first distance (for example, the first distance corresponding to the focal length of the entire camera 2 described above)
  • the common camera 7a The state is the whole imaging state. That is, the focusing position of the common camera 7a is set in the area including the trigger point P1, and the common camera 7a is located at the trigger point P1 in a relatively wide viewing range (that is, a relatively wide angle of view).
  • the authentication target person T can be imaged.
  • the focal length of the optical system including the zoom lens is set to a second distance (for example, a second distance corresponding to the focal length of the iris camera 3 described above) which is relatively long from the first distance.
  • the state of the common camera 7a switches from the overall imaging state to the iris imaging state. That is, the focusing position of the common camera 7a is set in the area including the focus point P2, and the common camera 7a is located at the focus point P2 in a relatively narrow viewing range (that is, a relatively narrow angle of view).
  • the authentication target person T can be imaged.
  • the focal length of the optical system including the zoom lens is set from the second distance to the first distance, the state of the common camera 7a returns from the iris imaging state to the overall imaging state.
  • the iris recognition operation for example, in order to perform iris recognition among the images captured by the common camera 7a in the iris imaging state based on the image captured by the common camera 7a in the overall imaging state.
  • Authentication target based on the process of setting the gaze area (ROI: Region of Interest) IA that defines the image part that is actually acquired (that is, read out) and the image captured by the common camera 7a in the iris imaging state.
  • ROI Region of Interest
  • the image captured by the common camera 7a in the overall imaging state is substantially equivalent to the overall image 200 captured by the overall camera 2, it is referred to as "overall image 200" for convenience of explanation.
  • the image captured by the common camera 7a in the iris imaging state is substantially equivalent to the image obtained by synthesizing the plurality of iris images 300 captured by the plurality of iris cameras 3, for convenience of explanation. It is referred to as "iris image 300".
  • FIG. 10 is a flowchart showing the flow of the operation (that is, the iris authentication operation) of the iris authentication system 1a of the first modification.
  • the same step numbers are assigned and detailed description thereof will be omitted.
  • the image pickup control unit 615 moves to the trigger point P1.
  • the common camera 7a is controlled so as to capture the located authentication target person T (step S12a).
  • the image pickup control unit 615 controls the common camera 7a so as to image the authentication target person T located at the trigger point P1, so that the state of the common camera 7a becomes the overall image pickup state.
  • Control 7a For example, when the common camera 7a includes an optical system including a zoom lens as described above, the image pickup control unit 615 sets the focal length of the optical system including the zoom lens to a first distance that is relatively short.
  • the zoom lens is controlled (for example, the movable lens included in the zoom lens is moved) so as to be performed.
  • the image pickup control unit 615 controls the common camera 7a so as to take an image of the authentication target person T located at the trigger point P1.
  • the common camera 7a captures the authentication target person T located at the trigger point P1 (step S12a).
  • the entire image 200 (P1) captured by the common camera 7a is acquired by the image acquisition unit 611 (step S12a).
  • the area detection unit 612 performs image processing on the entire image 200 (P1) acquired in step S12a to obtain an image portion of the entire image 200 (P1) in which the target portion TP is reflected. It is detected as the target region TA (step S21). Further, the area detection unit 612 calculates the position coordinates C (overall: P1) in the whole image 200 (P1) of the detected target area TA (step S21).
  • the coordinate estimation unit 613 commonly captures the authentication target person T who has moved from the trigger point P1 to the focus point P2 based on the position coordinates C (overall: P1) of the target area TA calculated in step S21.
  • the position coordinates C (whole: P2) of the target region TA in the whole image 200 (P2) which is assumed to be acquired when it is assumed that the camera 7a has taken an image are estimated (step S22a).
  • the coordinate estimation unit 613 has a correspondence relationship between the object reflected in the whole image 200 (P1) and the same object reflected in the whole image 200 (P2), as in step S22 described above.
  • the position coordinate C (whole: P2) may be estimated from the position coordinate C (whole: P1) by using the first correspondence information indicating.
  • the first correspondence information of the first modification is different from the above-mentioned first correspondence information targeting the entire camera 2 in that it is information for the common camera 7a.
  • the coordinate estimation unit 613 captures the authentication target person T who has moved from the trigger point P1 to the focus point P2 based on the position coordinates C (overall: P2) estimated in step S22 by the common camera 7a in the iris imaging state.
  • the coordinate estimation unit 613 has a correspondence relationship between the object reflected in the overall image 200 (P2) and the same object reflected in the iris image 300 (P2), as in step S23 described above.
  • the position coordinate C (iris: P2) may be estimated from the position coordinate C (whole: P2) by using the second correspondence information indicating.
  • the second correspondence information of the first modification can image the target portion TP of the authentication target person T located at the focus point P2 (particularly, the common camera 7a in the overall imaging state and the common camera 7a in the iris imaging state). It is different from the above-mentioned second correspondence information targeting the entire camera 2 and the iris camera 3 in that the information targets the common camera 7a) in the iris imaging state.
  • the coordinate estimation unit 613 has a plurality of iris images 300 (P2) based on the position coordinates C (overall: P2). ), The position coordinates C (iris:) of the target area TA in the iris image 300 (P2) without performing the process of specifying one iris image 300 (P2) on which the target area TA is expected to be reflected. Estimate P2).
  • the camera setting unit 614 actually performs iris recognition among the iris images 300 captured by the common camera 7a in the iris imaging state based on the position coordinates C (iris: P2) estimated in step S23.
  • the gaze area (ROI: Region of Interest) IA that defines the image portion to be acquired (that is, read out) is set (step S32a).
  • the process of step S32a may be the same as the process of step S32a described above, which targets the iris camera 3 except that the common camera 7a is targeted.
  • the image pickup control unit 615 images the authentication target person T located at the focus point P2.
  • the common camera 7a is controlled (step S42a).
  • the imaging control unit 615 switches the state of the common camera 7a from the overall imaging state to the iris imaging state before controlling the common camera 7a so as to image the authentication target person T located at the focus point P2.
  • the common camera 7a is controlled in this way. Specifically, the imaging control unit 615 switches the state of the common camera 7a from the overall imaging state to the iris imaging state after the entire image 200 is acquired in step S12a and before the iris image 300 is acquired in step S42a.
  • the common camera 7a may be controlled as described above.
  • the image pickup control unit 615 is set to a second distance at which the focal length of the optical system including the zoom lens is relatively long.
  • the zoom lens for example, move the movable lens included in the zoom lens. That is, the image pickup control unit 615 changes the focal length of the optical system including the zoom lens from the relatively short first distance to the relatively long second distance.
  • the state of the common camera 7a is switched from the overall imaging state to the iris imaging state.
  • the image pickup control unit 615 controls the common camera 7a so as to take an image of the authentication target person T located at the focus point P2.
  • the common camera 7a images the authentication target person T located at the focus point P2 (step S42a).
  • the iris image 300 (particularly, the image portion in the gaze area IA of the iris image 300) captured by the common camera 7a is acquired by the image acquisition unit 611 (step S42a).
  • the authentication unit 616 performs iris authentication using the iris image 300 acquired in step S42 (step S51).
  • the iris authentication system 1a of the first modification can enjoy the same effect as the effect that the iris authentication system 1 described above can enjoy.
  • the coordinate estimation unit 613 uses two correspondence information, the first and second correspondence information, from the position coordinate C (whole: P1) to the position coordinate C (whole). : P2) is estimated, and then the position coordinate C (iris: P2) is estimated from the position coordinate C (overall: P2).
  • the coordinate estimation unit 613 replaces the two correspondence information of the first and second correspondence information with a single correspondence information (for example, the first transformation matrix H1) in which both the first and second correspondence information are reflected.
  • the position coordinate C (iris: P2) may be estimated directly from the position coordinate C (whole: P1) by using (a single transformation matrix corresponding to the second transformation matrix H2).
  • a single trigger point P1 is set.
  • a plurality of trigger points P1 having different distances from the reference point P0 may be set.
  • the whole camera 2 may image the authentication target person T located at at least one trigger point P1 among the plurality of trigger points P1.
  • the iris recognition system 1 may include a plurality of overall cameras 2 corresponding to a plurality of trigger points P1 respectively.
  • the iris authentication system 1 may include a plurality of motion sensors 4 corresponding to the plurality of trigger points P1 respectively.
  • the iris authentication system 1 may include a single iris camera 3.
  • the field of view of the iris camera 3 is an appropriate range so that the iris camera 3 can image the target portion TP of the authentication target person T located at the focus point P2 regardless of the height of the authentication target person T. It may be set to.
  • the camera setting unit 614 performs the process of step S31 in FIG. 5 (that is, one iris camera 3 that captures the authentication target person T). It is not necessary to perform the selection process).
  • the camera setting unit 614 does not have to perform the process of setting the gaze area IA (process corresponding to step S32 of FIG. 5 or step S32a of FIG. 10).
  • the iris recognition system 1 does not have to operate in the gaze area mode.
  • the image acquisition unit 611 may acquire the entire iris image 300 captured by the iris camera 3 or the common camera 7a.
  • the authentication unit 616 may perform iris authentication using the entire iris image 300 captured by the iris camera 3 or the common camera 7a.
  • the iris recognition device 6 includes an image acquisition unit 611, an area detection unit 612, a coordinate estimation unit 613, a camera setting unit 614, an image pickup control unit 615, and an authentication unit 616.
  • FIG. 11 which is a block diagram showing a modified example of the iris recognition device 6, the iris recognition device 6 does not include at least one of the area detection unit 612, the coordinate estimation unit 613, and the camera setting unit 614. You may.
  • the image pickup control unit 615 may execute the processes performed by the area detection unit 612, the coordinate estimation unit 613, and the camera setting unit 614, respectively.
  • an external device of the iris recognition device 6 may execute the processes performed by the area detection unit 612, the coordinate estimation unit 613, and the camera setting unit 614, respectively. Further, as shown in FIG. 11, the iris recognition device 6 does not have to include the authentication unit 616. In this case, a device outside the iris recognition device 6 may execute the process performed by the authentication unit 616.
  • the iris authentication system 1 includes a motion sensor 4.
  • the iris recognition system 1 does not have to include the motion sensor 4.
  • the whole camera 2 or the common camera 7a captures a scene within the field of view at a predetermined frame rate (that is, an imaging rate) regardless of whether or not the authentication target person T is located at the trigger point P1. You may continue to image.
  • the whole camera 2 or the common camera 7a may continue to image the scene within the field of view at a predetermined frame rate, at least during the period when the authentication target person T passes the trigger point P1.
  • the whole camera 2 or the common camera 7a sets the authentication target person T at the timing when the authentication target person T reaches the trigger point P1. It can be imaged. That is, even when the iris recognition system 1 does not include the motion sensor 4, the image acquisition unit 611 can acquire the entire image 200 showing the authentication target person T located at the trigger point P1. ..
  • the iris recognition device 6 (for example, the area detection unit 612) analyzes the entire image 200 to authenticate the location at the trigger point P1. It may be determined whether or not the entire image 200 in which the subject T is captured has been acquired. That is, the iris recognition device 6 may determine whether or not the authentication target person T is located at the trigger point P1 by performing image analysis on the entire image 200.
  • the iris recognition device 6 When it is determined that the authentication target person T is located at the trigger point P1 (that is, the entire image 200 showing the authentication target person T located at the trigger point P1 is acquired), the iris recognition device 6 Is a process of selecting one iris camera 3 for photographing the authentication target person T located at the focus point P2 based on the whole image 200 (specifically, steps S21 to S32 of FIG. 5 or FIG. 10). A series of processes leading up to). On the other hand, when it is determined that the authentication target person T is not located at the trigger point P1, the iris recognition device 6 does not start a series of processes from step S21 to step S32 in FIG. 5 or FIG.
  • the iris recognition device 6 may adopt an existing method as an image analysis method for determining whether or not the authentication target person T is located at the trigger point P1. For example, the iris recognition device 6 may determine whether or not the authentication target person T is located at the trigger point P1 by estimating the depth from the entire image 200. For example, the iris recognition device 6 detects the feet of the authentication target person T shown in the entire image 200, and determines whether or not the detected feet are located at the trigger point P1 to determine the authentication target person. It may be determined whether or not T is located at the trigger point P1.
  • the iris recognition device 6 determines whether or not the distance between the eyes of the authentication target person T shown in the entire image 200 has reached a predetermined value, so that the authentication target person T is located at the trigger point P1. It may be determined whether or not it is.
  • the iris authentication system 1 includes a motion sensor 5.
  • the iris recognition system 1 does not have to include the motion sensor 5.
  • the gaze area IA of the iris camera 3 is set in step S32 of FIG. 5
  • the iris camera 3 for which the gaze area IA is set is whether or not the authentication target person T is located at the focus point P2.
  • the scene within the visual field range may be continuously imaged at a predetermined frame rate (that is, the imaging rate).
  • the common camera 7a for which the gaze area IA is set is not related to whether or not the authentication target person T is located at the focus point P2.
  • the scene within the field of view may be continuously imaged at a predetermined frame rate.
  • the iris camera 3 or the common camera 7a continues to image the scene within the field of view at a predetermined frame rate (that is, the imaging rate), at least during the period when the authentication target person T passes the focus point P2. You may.
  • the iris camera 3 or the common camera 7a authenticates when the authentication target person T reaches the focus point P2 from the trigger point P1.
  • the subject T can be imaged. That is, even when the iris recognition system 1 does not include the motion sensor 5, the image acquisition unit 611 can acquire the iris image 300 in which the authentication target person T located at the focus point P2 is captured. ..
  • an imaging system an imaging method, a control device, a computer program, and a recording medium
  • the embodiment of the imaging system, the imaging method, the control device, the computer program, and the recording medium is an arbitrary authentication system that authenticates the authentication target person T based on the feature amount of a predetermined part different from the iris of the authentication target person T. May be applied to. That is, the iris authentication system 1 may be modified into an arbitrary authentication system that performs an arbitrary authentication operation instead of the iris authentication operation. As an example of such an arbitrary authentication system, there is a face authentication system that authenticates the authentication target person T based on the facial feature amount of the authentication target person T.
  • the embodiment of the imaging system, the imaging method, the control device, the computer program, and the recording medium is to move the imaging target person based on the image of the imaging target person captured by the entire camera 2 (or the first imaging device). It may be applied to any imaging system that controls the iris camera 3 (or a second imaging device) to image. That is, the iris recognition system 1 may be modified into an arbitrary imaging system that images the image target person at the trigger point P1 and the focus point P2 described above by using at least two types of imaging devices.
  • the iris recognition system 1 may authenticate the authentication target person T using an arbitrary part of the authentication target person T.
  • any authentication system that authenticates the authentication target person T using an arbitrary part of the authentication target person T may have the same configuration as the iris authentication system 1 and perform the same operation.
  • Appendix 1 The imaging system according to Appendix 1 focuses on a first imaging device that images an imaging target located at a first point and a second point located behind the first point in the moving direction of the imaging target.
  • a control device that controls the second imaging device so as to image the imaging target located at the second point based on the second imaging device whose position is set and the image captured by the first imaging device. It is an imaging system including.
  • the imaging system according to Appendix 2 has a first detection device that detects whether or not the imaging target is located at the first point, and a first detection device that detects whether or not the imaging target is located at the second point.
  • the first imaging device is located at the first point when the first detection device detects that the imaging target is located at the first point.
  • the image pickup target is imaged, and when the second detection device detects that the image pickup target is located at the second point, the second image pickup device captures the image pickup target located at the second point.
  • the imaging system according to Appendix 4 is the imaging system according to Appendix 1, wherein the second imaging device continues to image at a predetermined imaging rate during a period in which the imaging target passes through the second point.
  • the imaging system according to Appendix 5 further includes a first detection device that detects whether or not the imaging target is located at the first point, and the first imaging device includes the imaging target at the first point.
  • the control device is (i) imaged by the first imaging device of the imaging target located at the first point based on the image captured by the first imaging device. It is said that the first position, which is a position in the image, is specified, and (ii) the second image pickup apparatus takes an image of the image pickup target that has moved from the first point to the second point based on the first position. Under the assumed situation, the second position, which is the position of the imaging target in the image captured by the second imaging device, is estimated, and (iii) the position is located at the second position based on the second position.
  • the imaging system according to any one of Supplementary note 1 to 5, which controls the second imaging apparatus so as to image the imaging target.
  • Appendix 7 In the imaging system according to Appendix 7, in order for the control device to estimate the second position based on the first position, (i) the second position from the first point based on the first position.
  • the third position which is the position of the image pickup target in the image captured by the first image pickup device, is estimated under the condition that the image pickup target moved to the point is imaged by the first image pickup apparatus.
  • Appendix 8 The imaging system according to Appendix 8 includes a plurality of the second imaging devices, and the control device identifies a position in the image to be imaged from the image captured by the first imaging device, and at the specified position.
  • Appendix 9 The imaging system according to Appendix 9 is the imaging system according to Appendix 7, wherein the control device estimates the third position based on the information about the first position and the moving direction of the imaging target.
  • Appendix 10 In the imaging system according to Appendix 10, the control device captures the imaging target located at the second point based on the image captured by the first imaging device and the information regarding the moving direction of the imaging target.
  • Appendix 11 In the imaging system according to Appendix 11, the information regarding the moving direction is an image captured by the first imaging device under the assumption that the object located at the first point is imaged by the first imaging device. The position of the object in the image and the object located at the second point in the image taken by the first imaging device under the assumption that the first imaging device has imaged the object.
  • Appendix 12 The imaging system according to Appendix 12 includes a plurality of the second imaging devices, and the control device is located at the second point of the plurality of second imaging devices based on the images captured by the first imaging device. Addendum 1 to 11 that selects one second imaging device that should image the located image pickup target and controls the selected second imaging device so as to image the image pickup target located at the second point.
  • the imaging system according to any one of the above.
  • Appendix 13 In the imaging system according to Appendix 13, a plurality of the first points are set, and the first imaging device images the imaging target located at at least one of the plurality of first points.
  • the imaging system according to any one of 12 to 12.
  • Appendix 14 The imaging system according to Appendix 14 can switch states between a first state and a second state, and in the first state, images an imaging target located at a first point, and the second state. In the state of, an image pickup device that images the image pickup target located at a second point located on the back side in the moving direction of the image pickup target from the first point, and an image captured by the image pickup device in the first state.
  • the image pickup system includes a control device for switching the image pickup device from the first state to the second state by controlling the image pickup device based on the above.
  • Appendix 15 In the imaging system according to Appendix 15, the imaging apparatus sets the focusing position in the region including the first point in the first state, and focuses on the region including the second point in the second state.
  • Appendix 16 The imaging system according to Appendix 16 has a first detection device that detects whether or not the imaging target is located at the first point, and detects whether or not the imaging target is located at the second point.
  • Appendix 17 The imaging system according to Appendix 17 is the first point when the first detecting device detects that the imaging target is located at the first point in the imaging device in the first state. When the second detection device detects that the image pickup target is located at the second point, the image pickup device in the second state captures the image pickup target located in the second position.
  • Appendix 18 The imaging system according to Appendix 18, wherein the imaging apparatus continues to image at a predetermined imaging rate during the period when the imaging target passes through the second point, according to any one of Appendix 14 to 17. It is a system.
  • Appendix 19 The imaging system according to Appendix 19 further includes a first detection device that detects whether or not the imaging target is located at the first point, and the imaging device is such that the imaging target is located at the first point.
  • Appendix 20 In the imaging system according to Appendix 20, the control device is (i) the first image pickup target located at the first point based on the image captured by the image pickup device in the first state.
  • the first position which is a position in the image captured by the imaging device in the state, is specified, and (ii) the imaging target moved from the first point to the second point based on the first position is described.
  • the second position which is the position of the image pickup target in the image taken by the image pickup device in the second state, is estimated, and ( iii)
  • Appendix 22 The imaging system according to Appendix 22 is the imaging system according to Appendix 21, wherein the control device estimates the third position based on the information about the first position and the moving direction of the imaging target.
  • Appendix 24 In the imaging system according to Appendix 24, the information regarding the moving direction is based on the first state under the assumption that the imaging device in the first state has imaged an object located at the first point. The first, under the condition that the position of the object in the image captured by the imaging device and the object located at the second point are imaged by the imaging device in the first state.
  • Appendix 25 In the imaging system according to Appendix 25, a plurality of the first points are set, and the imaging device in the first state targets the imaging target located at at least one of the plurality of first points.
  • Appendix 26 The imaging method according to Appendix 26 is based on an acquisition step of acquiring an image captured by a first imaging device that images an imaging target located at a first point and an image acquired in the acquisition step.
  • the second imaging device whose focusing position is set at the second point is controlled so as to image the imaging target located at the second point located on the back side in the moving direction of the imaging target from the point. This is an imaging method including a control step.
  • Appendix 27 The imaging method according to Appendix 27 is capable of switching between the first state and the second state, and in the first state, the imaging target located at the first point is imaged, and the second state is described.
  • the image pickup device in the first state takes an image from the image pickup device that images the image pickup target located at the second point located on the back side in the moving direction of the image pickup target from the first point. It includes an acquisition step of acquiring an image and a control step of switching the image pickup apparatus from the first state to the second state by controlling the image pickup apparatus based on the image acquired in the acquisition step. This is an imaging method.
  • Appendix 28 The control device according to Appendix 28 includes an acquisition means for acquiring an image captured by the first imaging device that captures an image pickup target located at the first point, and the first point based on the image acquired by the acquisition means. Control to control the second imaging device whose focusing position is set at the second point so as to image the imaging target located at the second point located on the back side in the moving direction of the imaging target. It is a control device including means.
  • Appendix 29 The control device according to Appendix 29 can switch the state between the first state and the second state, and in the first state, the image pickup target located at the first point is imaged, and the second state is described.
  • the image pickup device in the first state takes an image from the image pickup device that images the image pickup target located at the second point located on the back side in the moving direction of the image pickup target from the first point.
  • An imaging method including an acquisition means for acquiring an image and a control means for switching the imaging device from the first state to the second state by controlling the imaging device based on the image acquired by the acquisition means. Is.
  • Appendix 30 The computer program described in Appendix 30 is a computer program that causes a computer to execute the imaging method described in Appendix 26 or 27.
  • Appendix 31 The recording medium described in Appendix 31 is a recording medium on which the computer program described in Appendix 30 is recorded.
  • the present invention can be appropriately modified within the scope of the claims and within the scope not contrary to the gist or idea of the invention which can be read from the entire specification, and the imaging system, imaging method, control device, computer program and recording accompanied by such modification.
  • the medium is also included in the technical idea of the present invention.
  • Iris recognition system 2 Whole camera 200 Whole image 3 Iris camera 300 Iris image 4, 5 Motion sensor 6 Iris recognition device 61 CPU 611 Image acquisition unit 612 Area detection unit 613 Coordinate estimation unit 614 Camera setting unit 615 Imaging control unit 616 Authentication unit 7a Common camera P1 Trigger point P2 Focus point

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