WO2018185744A1 - Système et procédé de capture de l'iris d'un sujet - Google Patents

Système et procédé de capture de l'iris d'un sujet Download PDF

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Publication number
WO2018185744A1
WO2018185744A1 PCT/IL2018/050358 IL2018050358W WO2018185744A1 WO 2018185744 A1 WO2018185744 A1 WO 2018185744A1 IL 2018050358 W IL2018050358 W IL 2018050358W WO 2018185744 A1 WO2018185744 A1 WO 2018185744A1
Authority
WO
WIPO (PCT)
Prior art keywords
iris
imaging device
flash
flash light
illumination
Prior art date
Application number
PCT/IL2018/050358
Other languages
English (en)
Inventor
Robin KOCH
Tobias Mueller
Galya HARISH
Original Assignee
Koch Robin
Tobias Mueller
Harish Galya
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koch Robin, Tobias Mueller, Harish Galya filed Critical Koch Robin
Publication of WO2018185744A1 publication Critical patent/WO2018185744A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/141—Control of illumination
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/12—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes
    • A61B3/1216—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for looking at the eye fundus, e.g. ophthalmoscopes for diagnostics of the iris
    • 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
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units

Definitions

  • the present invention relates to the field of image capturing.
  • Iris recognition uses camera technology, typically employing near infrared (NIR) illumination to see through the iris coloration, to create images of the detail-rich, intricate structures of the iris.
  • NIR near infrared
  • One problem with iris recognition is that focusing is extremely difficult when accurately capturing near infrared (NIR) iris images.
  • NIR illumination and sensors are used. Due to NIR, the sensor is not as efficient compared to that which is visible by a human, so an increase in illumination is necessary.
  • the present invention meets the above mentioned needs by providing an improved image capturing device for iris patterns of humans, which is accurate, fast, devoid of the defects and distortions mentioned earlier, and also provides some advantageous aspects hitherto not known in this field, as described hereinafter in this complete specification.
  • the technique of the present invention enables to obtain three dimensional structures of an iris of a subject, and comprises illuminating the eye in a manner to reduce the size of the pupil, focusing illumination onto the inner ring of the iris, turning off the illumination, and activating an imaging device and a flash after a certain delay.
  • a maximal illumination leading to a maximal size of the iris, combined with a minimal reflection from such illumination, is provided.
  • the main problem with iris capturing is that the eye requires a certain illumination to be photographed. The illumination should keep the pupil small in size so that the iris can be shown in maximal dimensions.
  • any light source in the vicinity of the subject's face is always visible on the final picture due to the form and wet surface structure of the human eye.
  • the inventors have found that by using the technique of the present invention in which inter alia LED lights are distributed very close on the left and right of the subject's face, gives the advantage of keeping the pupil minimal in size, as well as giving the operator the ability to easily focus on the illuminated iris.
  • the operator turns off illumination of the LEDs and activates the imaging device for a certain period of time after illumination is turned off. This certain period of time is selected as the required optimal time to make sure the LEDs are completely dark (including the afterglow), yet the pupil has not yet adjusted its size.
  • pupils start to expand rapidly after illumination is removed.
  • the inventors have found that pupils start to expand not earlier than 1 ⁇ 2 of a second after turning off illumination.
  • a system for imaging an iris of a subject which comprises an LED arrangement configured for emitting an illumination light beam towards an inner ring of the iris causing reduction of a size of a pupil; an imaging device being configured and operable for focusing onto the illuminated inner ring of the iris, capturing an image of the iris and generating an image being indicative of a structure of the iris; a flash configured for producing a flash light; a diffuser arrangement configured for collecting the flash light and directing the flash towards a region of the iris at a certain projection angle; and a control unit being connected to the imaging device, the flash light and to the LED arrangement and being configured and operable for turning off the illumination and activating the imaging device after a certain period of time after the turn off.
  • the inner ring of the iris is defined as the boundary between the iris and the pupil.
  • the technique of the present invention causes reduction of a size of a pupil to a minimal size for the specific subject.
  • the size of the pupil can be reduced to 1/20 of the entire iris area depending on the individual, his/her physical state, and light sensitivity.
  • the projection angle is defined as the angle created between the direction of the center of the camera lens and the direction of the flash light beam.
  • the LED arrangement is located in the vicinity of a subject's face e.g. at a distance not exceeding 30 cm from the subject's eye.
  • the flash may be an external flash unit or may be incorporated in the imaging device.
  • the period of time includes a time after afterglow of the flash light.
  • the control unit comprises a switch (e.g. relay) connected via a wired or wireless connection to a remote release of the imaging device.
  • the switch may be a relay wired to a remote release of the imaging device which is triggered a certain time after the lights are turned off.
  • the imaging device (the front end of the camera lens) is disposed at a distance of less than 30 cm from the eye.
  • the system comprises a headrest for supporting a subject's face such that the distance between said imaging device and the subject is fixed.
  • the imaging device comprises a still imaging device.
  • the LED arrangement, the flash, the diffuser arrangement and the imaging device are enclosed in a certain volume.
  • a method for capturing an iris comprising illuminating at least one eye region to thereby reduce a size of a pupil; focusing an imaging device onto the illuminated inner ring of the iris; turning off the illumination; activating an imaging device and a flash generating a flash light after a certain time period after the turning off the illumination, and capturing an image of the iris; and obtaining an image being indicative of a structure of the iris.
  • one image of one iris is provided at each time.
  • the activation of the imaging device and the flash is performed substantially simultaneously.
  • the certain period of time is less than 1 second.
  • the method comprises aligning the flash light with respect to the iris, and focusing and collecting the flash light to obtain a certain angle of projection of the flash light on the iris. This technique enables to reduce reflection of light on the iris.
  • FIG. 1 is a schematic illustration of a block diagram of the system according to some embodiments of the present invention.
  • Fig. 2 is a schematic illustration of a flow chart of the method according to some embodiments of the present invention.
  • Fig. 3 is a schematic illustration of another possible configuration of the system according to some embodiments of the present invention.
  • Fig. 4 is a picture obtained by using the technique of the present invention.
  • the system 100 is configured for imaging an iris of a subject.
  • the system 100 includes such main constructional parts as an LED arrangement 102, an imaging device (e.g. camera) 104, a flash unit 106, a diffuser arrangement 110 and a control unit 108 .
  • the LED arrangement 102 may be distributed in a vicinity (e.g. not exceeding 30cm) of a subject's face and is configured for emitting illumination light beam towards an inner ring of the iris causing reduction of the size of a pupil.
  • the imaging device 104 (e.g. camera) is configured and operable for focusing onto the illuminated inner ring of the iris, capturing an image of the iris, and generating an image being indicative of a three-dimensional structure of the iris.
  • the front end of the camera lens may be disposed at a distance of less than 30 cm from the eye.
  • the imaging device 104 may be a still camera.
  • the imaging device 104 may be of the type Canon EOS 5d Mark II having extension rings of 56mm and a macro lens of the type Canon 100mm.
  • the camera settings may be as follows: l/200s, aperture f/8, ISO 160. In this specific and non-limiting example, the camera is placed at a distance of about 10 cm from the eye.
  • the connection between imaging device 104 and control unit 108 may be a fiber optics cable of about 9mm (45 single ropes each lmm).
  • the system 100 of the present invention provides sufficient illumination for a SLR Camera to operate at ISO values as low as 160 which results in very high overall quality of the resulting image without noise or artefacts.
  • the flash unit 106 is configured for producing a flash neutral (white) light. Although, as shown in the figure, the flash unit 106 is a device external to the imaging device 104, it may be a part of it.
  • the optical diffuser arrangement 110 is configured for collecting the flash light and directing the flash light towards a region of the iris at a certain projection angle a.
  • the flash unit 106 may be of the type Canon 430 EX II.
  • the flash settings may be as follows: 1 ⁇ 2, Zoom 105mm.
  • the flash connection with the control unit 108 may be a fiber optics cable with a length of about 45cm.
  • the optical diffuser arrangement 110 may be any device that diffuses or spreads out or scatters light in some manner. It may be a white surface, translucent objects, and can include ground glass diffusers, Teflon diffusers, holographic diffusers, opal glass diffusers, and greyed glass diffusers.
  • the flash light is collected in an adjusted and darkened plastic diffuser, and are focused and piped through fiber optics wires which are contained in a pre-bent copper pipe which guarantees the optimum angle at which the flash hits the iris.
  • the optimum angle of the flash pipe to hit the eye is in the range of about 40°-80° with respect to the center of the camera lens.
  • the control unit 108 is configured generally as a computing/electronic utility including inter alia such utilities as data input and output utilities 108A, 108B, memory 108C, and data processor and analyzer modules 108D, 108E.
  • the control unit 108 is connected to imaging device 104, the flash 106 and to LED arrangement 102.
  • some or all data analysis modules of the control unit 108 may be incorporated in a personal electronic/communication device, such as a smart phone.
  • a communication device may be installed with a specific software application.
  • Such a communication device may typically be located in the vicinity of the imaging device 104 during image acquisition, and the communication between them may be via Bluetooth, Wi-Fi based or other communication methods.
  • the control unit 104 is configured to turn off illumination and activate imaging device 104 after a certain period of time after the turn off.
  • the period of time may include a time after glow.
  • the control unit 108 comprises a switch 108G connected via a wired or wireless connection to a remote release of imaging device 104.
  • imaging device 104 e.g. pushes a foot switch which acts as the light switch and includes a relay as well.
  • the process may be automated, and upon detection of a certain sharpness of the iris by the data analyzer 108E of the control unit, the switch 108G may activate imaging device 104.
  • the switch 108G is connected (wired or wireless) to the remote release of imaging device 104 which can be triggered after less than 1 second of a second after the lights are turned off.
  • the inventors have found about 0.1 of a second enables to make sure the LEDs are completely dark (including the afterglow) but the pupils have not yet adjusted their sizes (they start to expand rapidly after the source of light is removed, but not earlier than 1 ⁇ 2 of a second). In this way, the size of the pupil is minimal, and the maximum size of the iris is thus portrayed.
  • the shadows (on the iris) created by the flashlight allow for portrayal of the three-dimensional structures of the iris.
  • the typical reflections of state of the art technology are heavily reduced or fully eliminated.
  • only minimum lighting distortion is present (0% - 1 ⁇ 2% of the iris size) depending on several factors such as curvature, and the size to which the pupil contracts.
  • the method 200 comprises in step 210 illuminating at least one eye region to thereby reduce the size of a pupil; focusing an imaging device onto the illuminated inner ring of the iris (step 220); turning off the illumination (step 230); activating an imaging device and a flash light after a certain time period T after turning off illumination (step 240); capturing an image of the iris (step 250), and obtaining an image being indicative of a structure of the iris.
  • Step 210 may be performed by using a LED arrangement emitting light in the visible range. The illumination spot of the LED arrangement is selected to cover at least the pupil's region of the eye.
  • Step 220 may be performed by adjusting the focal length of the camera lens such that the iris plane is at the focal point of the camera lens.
  • Step 230 may be performed automatically or manually by using a switch connected to the LED arrangement.
  • the period of time T may be less than 1 second after turning off the illumination.
  • the period of time T is appropriately selected to, on the one hand, capture the image when the iris has an optimal size, and, on the other hand, to reduce light reflections induced by the illumination which generate shade on regions of the picture.
  • the inventors have found that, by using a specific and non-limiting system, the optimal period of time T may be about 0.1 second.
  • activation of the imaging device and the flash light is performed substantially simultaneously, but a difference of a few tenths of seconds may exist between their activation. It should be noted that the proposed iris capturing method is very fast and takes about two minutes to perform all the steps 210-250 mentioned above.
  • the method comprises aligning the flash light with the iris, and focusing and collecting the flash to obtain a certain angle of projection of the flash light on the iris (step 260) to enable reduction of reflection of flash light on the iris.
  • the flash light is laterally aligned with respect to the iris at a projection angle of about 65°.
  • the front end of the camera lens of the imaging device 104 is disposed at a distance of less than 10cm (from the eye).
  • the system 300 comprises inter alia a headrest 310 for supporting a subject's face such that the distance between imaging device 104 and the subject is fixed.
  • the LED arrangement 102, the imaging device 104 the flash unit 106 and the diffuser arrangement 110 are enclosed in a certain volume (housing).
  • This configuration enables to provide a small and portable system, easily operable.
  • the imaging device 104 may slide on a mounting device such as a tripod (not shown) and can be easily placed at the required distance from the eye.
  • the switch activating the imaging device 104 and the flash may be a foot switch.
  • the subject places his/her head on the photo box's head rest.
  • the forehead is kept in place by a metal bar cushioned by foam.
  • the chin rest s on a plastic pillow (easily cleanable) which is filled with soft foam to allow for various face sizes.
  • the head is placed immediately in front of the imaging device.
  • the head rest serves also as a movement limiter for the imaging device which prevents the imaging device lens from touching the subject's eye.
  • One or both LED/s are switched on by the operator (depending on ambient lighting, the subject's individual pupil size etc.). The size of the pupil is reduced.
  • Fig. 4 shows an image 40 obtained by using the technique of the present invention. The three-dimensional structure and the high quality of the image are clearly shown. In a specific and non-limiting example, this image showing a three-dimensional structure of an individual iris, may be used as a personalized means to create art that includes a unique aspect of a subject's body. As each subject has a unique pair of eyes, while a fingerprint has 40 unique identification features, the iris has 256.
  • the image can be printed on any material of any size and may include photographs, logos, prints, or other indicia as a means for enhancing aesthetics and/or providing an opportunity for promotional marketing or advertising of a business, event, or for personal enhancement and customization.
  • the image can be printed on any textile to create personalized iris fashion items. The entire process may be performed in a store to enable customers to spend more time in the store and to create a unique buzz and motivate customers to visit stores. This can also enhance customer engagement and brand loyalty. An online "follow-up" personalized merchandize purchase may thus have long term effects.

Abstract

La présente invention concerne une technique d'imagerie/capture de l'iris d'un sujet. Le procédé consiste à éclairer au moins une région de l'oeil pour ainsi réduire la taille de la pupille; faire une mise au point au moyen d'un dispositif d'imagerie sur un anneau interne éclairé de l'iris; éteindre l'éclairage; activer un dispositif d'imagerie et un flash générant une lumière flash au bout d'un certain temps après l'arrêt de l'éclairage et capturer une image de l'iris; et obtenir une image indiquant une structure de l'iris. Le système comprend un agencement de DEL conçu pour émettre un faisceau lumineux d'éclairage vers un anneau interne de l'iris provoquant la réduction de la taille de la pupille; un dispositif d'imagerie est conçu et peut être actionné pour faire une mise au point sur l'anneau interne éclairé de l'iris, capturer des données d'image de l'iris et générer une image indiquant une structure de l'iris; une unité de flash conçue pour produire une lumière flash; un agencement de diffuseur conçu pour collecter la lumière flash et la diriger vers une région de l'iris à un certain angle de projection; et une unité de commande est connectée au dispositif d'imagerie, à la lumière flash, et à l'agencement de DEL, et est conçue et peut être actionnée pour éteindre l'éclairage produit par ledit agencement de DEL et activer le dispositif d'imagerie conjointement avec la lumière flash au bout d'un certain temps après l'arrêt.
PCT/IL2018/050358 2017-04-05 2018-03-28 Système et procédé de capture de l'iris d'un sujet WO2018185744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL251596 2017-04-05
IL251596A IL251596A0 (en) 2017-04-05 2017-04-05 System and method for photographing a user's iris

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WO2018185744A1 true WO2018185744A1 (fr) 2018-10-11

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WO (1) WO2018185744A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109394168A (zh) * 2018-10-18 2019-03-01 天目爱视（北京）科技有限公司 一种基于光照控制的虹膜信息测量系统
CN109394170A (zh) * 2018-10-18 2019-03-01 天目爱视（北京）科技有限公司 一种无反光的虹膜信息测量系统
CN111126145B (zh) * 2018-10-18 2024-05-10 天目爱视（北京）科技有限公司 一种避免光源像影响的虹膜3d信息获取系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6247813B1 (en) * 1999-04-09 2001-06-19 Iritech, Inc. Iris identification system and method of identifying a person through iris recognition
US20050152583A1 (en) * 2002-11-07 2005-07-14 Matsushita Electric Industrial Co., Ltd Method for cerficating individual iris registering device system for certificating iris and program for cerficating individual
US20050249385A1 (en) * 2004-05-10 2005-11-10 Matsushita Electric Industrial Co., Ltd. Iris registration method, iris registration apparatus, and iris registration program
US20050270386A1 (en) * 2004-05-28 2005-12-08 Hirofumi Saitoh Method and apparatus for authentication utilizing iris
WO2016080031A1 (fr) * 2014-11-20 2016-05-26 ソニー株式会社 Système de commande, dispositif de traitement d'informations, procédé de commande et programme

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6247813B1 (en) * 1999-04-09 2001-06-19 Iritech, Inc. Iris identification system and method of identifying a person through iris recognition
US20050152583A1 (en) * 2002-11-07 2005-07-14 Matsushita Electric Industrial Co., Ltd Method for cerficating individual iris registering device system for certificating iris and program for cerficating individual
US20050249385A1 (en) * 2004-05-10 2005-11-10 Matsushita Electric Industrial Co., Ltd. Iris registration method, iris registration apparatus, and iris registration program
US20050270386A1 (en) * 2004-05-28 2005-12-08 Hirofumi Saitoh Method and apparatus for authentication utilizing iris
WO2016080031A1 (fr) * 2014-11-20 2016-05-26 ソニー株式会社 Système de commande, dispositif de traitement d'informations, procédé de commande et programme

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109394168A (zh) * 2018-10-18 2019-03-01 天目爱视（北京）科技有限公司 一种基于光照控制的虹膜信息测量系统
CN109394170A (zh) * 2018-10-18 2019-03-01 天目爱视（北京）科技有限公司 一种无反光的虹膜信息测量系统
CN109394168B (zh) * 2018-10-18 2019-10-22 天目爱视（北京）科技有限公司 一种基于光照控制的虹膜信息测量系统
CN111126145A (zh) * 2018-10-18 2020-05-08 天目爱视（北京）科技有限公司 一种避免光源像影响的虹膜3d信息获取系统
CN111126145B (zh) * 2018-10-18 2024-05-10 天目爱视（北京）科技有限公司 一种避免光源像影响的虹膜3d信息获取系统

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