WO2009107704A1 - Dispositif d'authentification de l'iris - Google Patents

Dispositif d'authentification de l'iris Download PDF

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Publication number
WO2009107704A1
WO2009107704A1 PCT/JP2009/053513 JP2009053513W WO2009107704A1 WO 2009107704 A1 WO2009107704 A1 WO 2009107704A1 JP 2009053513 W JP2009053513 W JP 2009053513W WO 2009107704 A1 WO2009107704 A1 WO 2009107704A1
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WO
WIPO (PCT)
Prior art keywords
iris
unit
eye
circle
image
Prior art date
Application number
PCT/JP2009/053513
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English (en)
Japanese (ja)
Inventor
渡辺　孝弘
藤井　明宏
Original Assignee
沖電気工業株式会社
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
Priority claimed from JP2008043838A external-priority patent/JP2009205203A/ja
Priority claimed from JP2008053250A external-priority patent/JP2009211370A/ja
Application filed by 沖電気工業株式会社 filed Critical 沖電気工業株式会社
Publication of WO2009107704A1 publication Critical patent/WO2009107704A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00281—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal
    • H04N1/00307—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal with a mobile telephone apparatus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
    • G06F18/214—Generating training patterns; Bootstrap methods, e.g. bagging or boosting
    • 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
    • G06V40/19—Sensors therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/0035—User-machine interface; Control console
    • H04N1/00405—Output means
    • H04N1/00408—Display of information to the user, e.g. menus
    • H04N1/0044—Display of information to the user, e.g. menus for image preview or review, e.g. to help the user position a sheet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44—Secrecy systems
    • H04N1/4406—Restricting access, e.g. according to user identity
    • H04N1/442—Restricting access, e.g. according to user identity using a biometric data reading device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/44—Secrecy systems
    • H04N1/4406—Restricting access, e.g. according to user identity
    • H04N1/4433—Restricting access, e.g. according to user identity to an apparatus, part of an apparatus or an apparatus function
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2101/00—Still video cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0084—Digital still camera

Definitions

  • the present invention relates to an iris authentication device that authenticates an individual using an iris of an eye, which is a biological feature of an individual such as a person or an animal, and in particular, when a user captures an eye image in advance and registers data.
  • the present invention relates to a technique for preventing registration error of a registered image and enabling registration of a better eye image (that is, an eye image).
  • a fixed iris authentication device using an image of an iris portion of a human eye is disclosed in Japanese Patent No. 3307936. Further, portable iris authentication devices are disclosed in Japanese Patent Application Laid-Open Nos. 2005-292542, 2005-327161, and 2008-15884.
  • the conventional iris authentication apparatus acquires an eye image in a user's living body with a camera, cuts out an iris part from the acquired eye image, extracts iris data, When matching with the iris data of the registered user, the user is authenticated as the user.
  • FIG. 15A and 15B are a schematic configuration diagram and a functional block diagram showing a conventional portable iris authentication apparatus described in the above-mentioned document.
  • FIG. 15A is a schematic configuration diagram (outside view) of the portable iris authentication device
  • FIG. 15B is a functional block diagram of the iris authentication device main body in FIG. 15A.
  • the portable iris authentication device 10 is a device mounted on a mobile phone that is a mobile terminal device, and includes a housing unit 11.
  • An iris authentication device main body 20 is provided inside the housing unit 11.
  • a camera 22 a of the photographing unit 22, an illumination light source 23 a of the illumination unit 23, a display screen 25 a of the display unit 25, and the like are provided on the rear surface outside the housing unit 11.
  • the illuminating light source 23a shoots the eyes with the camera 22a and obtains an image of the eyes.
  • the illuminating light source 23a emits light to irradiate the eyes with the light. Works to shoot the eyes.
  • the iris authentication apparatus main body 20 in the housing unit 11 is acquired by the input unit 21 having a registration (shooting) start key and the like, the shooting unit 22 having a camera 22a, the lighting unit 23 having an illumination light source 23a, and the shooting unit 22.
  • the image capturing unit 24 captures (acquires) an eye image, the display unit 25 having a display screen 25a, an iris recognition unit 26, an iris recognition dictionary 27, and the like.
  • the photographing unit 22 operates the lens, shutter, and the like of the camera 22a to photograph the eyes of the user who is a subject located in front of the camera 22a.
  • the illumination unit 23 illuminates the user's face by causing the illumination light source 23a to emit light in synchronization with the timing at which the imaging unit 22 captures the eyes.
  • the eye image photographed by the photographing unit 22 is captured by the image capturing unit 24, and the image data is displayed on the display screen 25 a of the display unit 25 and also sent to the iris recognition unit 26.
  • the iris recognition unit 26 extracts the iris data from the eye image captured by the image capture unit 24 and compares it with the iris data stored and registered in advance in the iris recognition dictionary 26 to determine whether the user is the user. Recognize (authenticate).
  • the user himself / herself takes an image and authenticates in the above authentication process.
  • the user himself will acquire eye images and register iris data using the iris authentication device 10 mounted on the mobile terminal device. It is envisaged to do. In this case, it is expected that the following two problems (1) and (2) will occur in the registration work.
  • the registration start key press timing may differ from the actual captured image. For example, when the registration start key is pressed, the iris data of the actually captured image is registered with a time delay later than this, so there is no blink of eyes between the registration start key press and registration. When this is done, the registration start key press timing differs from the actual captured image. For this reason, there may be a case where an image or the like whose eyes are not opened differently from the image confirmed on the display screen 25a is registered.
  • An iris authentication apparatus includes an illumination unit that irradiates light to an individual's eyes, an imaging unit that captures the eye irradiated with the light and acquires the image of the eye, and a plurality of the imaging units An extraction unit that sequentially extracts an iris circle and a pupil circle from an image of the eye, a display unit that displays the sequentially extracted iris circle or pupil circle on the display screen in a superimposed manner on the plurality of eye images, and the individual Has an input unit capable of inputting that the content of the display screen has been confirmed, a registration unit for registering data, and a recognition unit.
  • the recognizing unit extracts iris data from the eye image, registers the extracted iris data in the registration unit, and creates new iris data from the new eye image acquired by the photographing unit at the time of authentication. And the new iris data extracted and the iris data registered in the registration unit are collated to recognize the new eye image.
  • the iris authentication device includes a capture unit that captures and stores a plurality of images of the eyes acquired by the imaging unit, and when the input is performed from the input unit, the plurality of stored A selection unit that reads out an eye image and selects an eye image to be registered, and the recognition unit extracts iris data from the selected eye image and stores the iris data in the registration unit. You may register.
  • the iris authentication apparatus shoots an eye irradiated with light based on a lighting unit that irradiates light to the eyes of an individual and a first control signal when registering iris data of the eyes.
  • An extraction unit that sequentially extracts iris circles and pupil circles from one eye image, and the sequentially extracted iris circles or pupil circles are superimposed on the plurality of first eye images, respectively, based on a second control signal.
  • a display unit for displaying on a display screen; a registration unit for registering the iris data; and monitoring the variation in the position and size of the iris circle or the pupil circle corresponding to the plurality of first eye images, and the variation
  • a determination unit for determining whether or not is smaller than a predetermined amount, and at the time of registration Control that outputs the second control signal to control the display unit, and outputs the first control signal to control the imaging unit when the determination result is “smaller than a predetermined amount”. Part and a recognition part.
  • the recognizing unit extracts the iris data from the acquired first eye image at the time of registration and registers it by the registration unit, and extracts the iris data from the second eye image at the time of authentication.
  • the second eye image is recognized by comparing the iris data with the iris data registered by the registration unit.
  • the iris authentication apparatus may further include a capture unit that captures the first and second eye images acquired by the photographing unit, and the extraction unit, the determination unit, and the recognition unit are configured to capture the capture unit.
  • the processed first and / or second eye image may be processed.
  • the position of the iris circle or the pupil circle displayed on the display screen is always superimposed on the actual eye image when registering the iris. Therefore, the user can intuitively grasp whether the iris is correctly detected. Therefore, the eye image can be registered from the ideal shooting position. As a result, by registering the eye image at the correct position, the iris data is correctly acquired from the eye image, and the accuracy of the matching process is improved.
  • iris authentication apparatus when a user performs an input for starting registration on the assumption that the iris has been acquired correctly, an input timing for starting the registration and an actual captured image are obtained. Even if they are different, the optimum image is selected from the stored eye images and registered. Therefore, iris data is acquired correctly, and misrecognition and recognition failure can be reduced.
  • the position of the iris circle or the pupil circle displayed on the display screen is always displayed superimposed on the actual eye image under the control of the control unit. Therefore, the user can intuitively grasp whether the eye position is correctly positioned.
  • the determination unit detects that the iris position is stable and instructs the photographing unit to shoot a registered image, and then shoots a registration eye image. The iris is photographed. As a result, even a user who is not skilled in registration can register iris data from an ideal eye image, and as a result, the accuracy of iris recognition processing is improved.
  • FIG. 1 is a schematic configuration diagram of a portable iris authentication device according to Embodiment 1.
  • FIG. 1 is a functional block diagram of a portable iris authentication device according to Embodiment 1.
  • FIG. It is a figure which shows the use condition of the portable iris authentication apparatus 30 of FIG. 1A. It is a figure which shows the use condition of the portable iris authentication apparatus 30 of FIG. 1A. It is a figure which shows the example of the screen display in the display screen 46a of FIG. 1A. It is a figure which shows the example of the screen display in the display screen 46a of FIG. 1A.
  • FIG. 1 is a functional block diagram of the iris authentication apparatus main body in the portable iris authentication apparatus which concerns on Example 2.
  • FIG. 10 is a diagram illustrating a display example of registration image selection in the third embodiment. It is a schematic block diagram of the portable iris authentication apparatus which shows Example 5 of this invention. It is a functional block diagram of the portable iris authentication device which shows Example 5 of this invention. It is a figure which shows the use condition of the portable iris authentication apparatus 30 of FIG. 9A.
  • FIG. 9A It is a figure which shows the use condition of the portable iris authentication apparatus 30 of FIG. 9A. It is a figure which shows the example of a screen display in the display screen 46a of FIG. 9A. It is a figure which shows the example of a screen display in the display screen 46a of FIG. 9A.
  • Example 5 it is a figure which shows transition of the variation
  • FIG. It is a figure which shows the example of a display which signals the fine user 60 in Example 5.
  • FIG. It is a figure which shows the example of a display which signals the fine user 60 in Example 5.
  • FIG. It is a schematic block diagram of the conventional portable iris authentication apparatus. It is a functional block diagram of the conventional portable iris authentication device.
  • FIG. 1A and 1B are a schematic configuration diagram and a functional block diagram of a portable iris authentication apparatus according to Embodiment 1 of the present invention.
  • 1A is a schematic configuration diagram (external view) of the portable iris authentication device
  • FIG. 1B is a functional block diagram of the iris authentication device main body in FIG. 1A.
  • the portable iris authentication device 30 is a device that is mounted on a mobile terminal device (for example, a mobile phone) and authenticates a human iris, and includes a housing unit 31. Yes.
  • An iris authentication device main body 40 as shown in FIG. 1B is provided inside the housing unit 31.
  • a camera 42a including a lens, a shutter, and the like, an illumination light source 43a that generates light, a display screen 46a such as a liquid crystal, and a shooting start key (not shown) And an input unit 41 and so on.
  • the iris authentication apparatus main body 40 provided in the housing unit 31 has a photographing unit 42 connected to an input unit 41, and an illumination unit 43 and an image capture unit 44 are connected to the photographing unit 42.
  • the photographing unit 42 includes a camera 42a, and operates the lens, shutter, and the like of the camera 42a to photograph an eye that is a subject located in front of the camera 42a and obtain an eye image.
  • the illumination unit 43 includes a light source 43a for illumination, and emits light from the light source 43a and irradiates light to the eye in synchronization with the timing of photographing the eyes by the photographing unit 42.
  • the image capture unit 44 has a storage unit such as a memory, and captures an eye image acquired by the photographing unit 42, and a display unit 46 is connected to the image capture unit 44 via a display control unit 45. , An extraction unit (for example, an iris circle / pupil circle extraction unit) 47 is connected.
  • the display unit 46 has a display screen 46a and displays an eye image or the like on the display screen 46a.
  • the iris circle / pupil circle extraction unit 47 sequentially extracts the iris circle / pupil circle from the eye image captured by the image capture unit 44.
  • a display control unit 45 is connected to the display unit 46 and the iris circle / pupil circle extraction unit 47.
  • the display control unit 45 controls the display unit 46 in order to display the extraction result of the iris circle / pupil circle by the iris circle / pupil circle extraction unit 47 on the display screen 46a.
  • a recognition unit (for example, iris recognition unit) 48 is connected to the image capture unit 44, and a registration unit (for example, iris recognition dictionary) 49 is further connected to the iris recognition unit 48.
  • the iris recognition unit 48 extracts iris data from the eye image captured by the image capture unit 44 during registration and registers it in the iris recognition dictionary 49, and extracts iris data from the eye image captured by the image capture unit 44 during authentication. Then, the extracted iris data and the iris data registered in the iris recognition dictionary 49 are collated to recognize whether or not the user is the user.
  • Each component necessary for such an iris authentication function is configured by software incorporated in the iris authentication device main body 40 or an individual circuit.
  • FIG. 1A and 2B are diagrams showing a use state in the portable iris authentication device 30 of FIG. 1A.
  • 2A is a side view showing a method of positioning the eye 51 within the imaging range of the portable iris authentication device 30 when the user 50 registers and authenticates the iris 51a of the eye 51
  • FIG. 2B is a part of FIG. 1A.
  • the symbol D is the distance between the eye 51 located near the focal length of the lens of the camera 42a and the lens
  • the symbol M is the movement angle of the eye 51 with respect to the optical axis of the camera 42a.
  • the eye 51 has a pupil 51b at the center of an iris 51a which is a black eye.
  • FIG. 3A and 3B are diagrams showing examples of screen display on the display screen 46a of FIG. 1A.
  • the display screen 46a is provided with a display area 46b where an eye image can be displayed.
  • the iris circle I and the pupil circle P extracted from the iris 51a and the pupil 51b by the iris circle / pupil circle extraction unit 47 are displayed in the display area 46b. Is drawn.
  • the user 50 holds the casing 31 with a hand 52 and performs the registration process of the iris 51a.
  • the camera 42a of 42 is brought close to one eye 51 of its own, and a shooting start key (not shown) provided in the input unit 41 is pressed to start shooting. Then, from the start of the positioning operation of the eye 51 with respect to the camera 42a, the light source 43a of the illumination unit 43 emits light and the vicinity of the eye 51 is irradiated. Further, the camera 42a of the photographing unit 42 is activated, the vicinity of the eye 51 is photographed and an image is acquired, and the image capturing unit 44 starts capturing the image. Further, the images being aligned are sequentially displayed on the display screen 46 a of the display unit 46 under the control of the display control unit 45.
  • the iris circle / pupil circle extraction unit 47 determines whether the iris circle I and the pupil circle P, which are circular portions of the iris 51a and the pupil 51b, exist in the captured image captured by the image capture unit 44. Whether or not is detected by extraction processing.
  • a method for detecting the circular shapes of the iris 51a and the pupil 51b for example, a general algorithm in the image processing field such as edge detection and Hough transform can be used.
  • the display control unit 45 displays the iris circle I and the pupil circle P in the display area 46b so as to overlap the captured image of the eye 51 as shown in the display screen 46a of FIG. 3A.
  • FIG. 3A shows a state in which the detected iris circle I and pupil circle P completely coincide with the positions of the iris 51a and pupil 51b of the actual eye image.
  • the eye image at the time of such display is suitable for registration.
  • the display of the iris circle I and the pupil circle P is preferably drawn with a line having a color tone that is clearly distinguished from the eye image.
  • the detection of the iris circle I and the pupil circle P is not performed correctly, as shown in FIG. 3B.
  • the positions of the iris circle I and the pupil circle P may not coincide with the eye 51 and the iris 51a / pupil 51b in the image.
  • the iris circle I and the pupil circle P are positively displayed on the display screen 46a even in such a case. Thereby, the user 50 can intuitively grasp that the iris 51a is not correctly detected.
  • the user 50 determines that the eye 51 has been correctly positioned, and presses a registration start key (not shown) of the input unit 41. .
  • the captured image data of the eye 51 when the key of the user 50 is pressed is sent from the image capture unit 44 to the iris recognition unit 48.
  • the iris recognition unit 48 calculates iris data from the eye image and stores the iris data in the iris recognition dictionary 49, registration is completed.
  • the iris circle / pupil circle extraction unit 47 extracts the iris from the eye image captured by the image capture unit 44. Circle I and pupil circle P are extracted sequentially. The iris circle I and the pupil circle P are sequentially displayed on the display screen 46a so as to overlap the captured image that is the basis of extraction, and the iris 51a and the pupil 51b are acquired at the correct positions, and the iris 51a is correctly detected. I made it easier to see.
  • the registration start key is pressed to register. It can be performed.
  • the camera 42a of the photographing unit 42 is brought close to one eye 51 of the user and the position of the eye 51 with respect to the camera 42a is determined.
  • the user 50 presses an authentication start key (not shown) of the input unit 41 the eye 51 is irradiated by the light source 43a, and the eye 51 is photographed by the camera 42a.
  • the captured eye image is captured by the image capture unit 44 and sent to the iris recognition unit 48.
  • the iris recognition unit 48 extracts the iris data from the captured image, compares it with the iris data registered in the iris recognition dictionary 49, and recognizes whether or not the user 50 is the user.
  • the technique of the first embodiment is more effective when it is a high-performance portable terminal device and the time from the registration start key pressing to the image capture is very short.
  • FIG. 4 is a functional block diagram of the iris authentication apparatus main body in the portable iris authentication apparatus according to the second embodiment. Elements common to the elements in FIG. 1B showing the first embodiment are denoted by common reference numerals. .
  • the iris authentication apparatus main body 40A in the portable iris authentication apparatus of the second embodiment has a function instead of the image capture unit 44 and the iris circle / pupil circle extraction section 47 in the iris authentication apparatus main body 40 of the first embodiment.
  • a different image capture unit 44A and an iris circle / pupil circle extraction unit 47A are provided, and a selection unit (for example, an image selection unit) 61 is newly added.
  • the image capture unit 44A includes a storage unit 44a such as a memory, and captures a plurality of images of the eye 51 positioned by the user 50 and acquired by the photographing unit 42 and stores them in the storage unit 44a.
  • a display control unit 45, an iris circle / pupil circle extraction unit 47A, and an image selection unit 61 are connected to the image capture unit 44A.
  • the iris circle / pupil circle extraction unit 47A sequentially extracts the iris circle I and the pupil circle P from the plurality of eye images stored in the storage unit 44a.
  • the image selection unit 61 reads a plurality of eye images from the storage unit 44a retroactively by a predetermined time from the time when a registration start key (not shown) of the input unit 41 is pressed, and is suitable for registration (that is, an eye image suitable for registration). Select the eye image to be registered.
  • the image selection unit 61 searches the image stored in the storage unit 44a of the image capture unit 44A by going back a predetermined time from the time when the user 50 presses the registration start key. Then, an eye image to be registered is selected from the stored captured images.
  • Other configurations are the same as those of the first embodiment.
  • each configuration necessary for the iris authentication function is configured by software or individual circuits incorporated in the iris authentication apparatus main body 40A, as in the first embodiment.
  • FIG. 5 is a diagram showing a general variation of the movement amount of the iris center coordinate and the movement amount of the iris diameter
  • FIG. 6 shows a general variation of the size of the iris diameter, the iris expression rate, and the focus degree.
  • FIG. 7 is a conceptual diagram of the iris expression rate.
  • the user 50 brings the camera 42a of the photographing unit 42 close to the one eye 51 of his / her own to the input unit 41 in substantially the same manner as the first embodiment.
  • a shooting start key (not shown) provided is pressed to start shooting.
  • the vicinity of the eye 51 is photographed by the camera 42a of the photographing unit 42, and an image is acquired.
  • the image capture unit 44A starts capturing the image and stores it in the storage unit 44a.
  • the images being aligned are sequentially displayed on the screen 46a.
  • the iris circle / pupil circle extraction unit 47A determines whether the iris circle I and the pupil circle P of the iris 51a and the pupil 51b exist in the image. Is detected by the extraction process.
  • the display control unit 45 displays the iris circle I and the pupil circle P in the display area 46b so as to overlap the captured image of the eye 51 as shown in the display screen 46a of FIG. 3A.
  • the user 50 confirms that the display on the display screen 46a is as shown in FIG. 3A, the user 50 determines that the eye 51 has been correctly positioned, and presses a registration start key (not shown) of the input unit 41. .
  • captured images for a certain period of time are always stored in the storage unit 44a of the image capture unit 44A.
  • the storage unit 44a stores, for example, about 10 image frames and the center coordinates of the iris circle I and the pupil circle P for about 1 second.
  • the image selection unit 61 determines that each image frame has the center coordinates and diameters of the iris circle I and the pupil circle P relative to the previous image frame ( The amount of change (difference), the degree of focus, and the iris expression rate of how much the radius or diameter) has changed are obtained.
  • the center coordinates of the iris circle I and the pupil circle P change when the eye 51 of the user 50 moves with respect to the optical axis of the camera 42a in the state of FIG. 2A.
  • the diameter (radius or diameter) of the iris circle I and the pupil circle P is such that when the eye 51 of the user 50 moves away from the camera 42a and the distance D increases, the diameter decreases and the eye 51 approaches the camera 42a and the distance D increases. When becomes smaller, the diameter becomes larger.
  • the larger the diameter of the iris circle I and the pupil circle P the higher the iris authentication accuracy.
  • the in-focus degree is a ratio at which the focal length of the lens of the camera 42a matches the distance D.
  • the iris expression rate is S ⁇ b> 1 where the area of the entire part of the iris 51 a (that is, the total area when the iris 51 a has no part hidden by the ⁇ 53) is hidden by the ⁇ 53.
  • the ratio is represented by the following formula (1).
  • Iris expression rate (S1-S2) / S1 x 100 (%) (1)
  • FIG. 5 shows a general transition of the variation amount of the central coordinates or the variation amount of the diameter of the iris circle I or the pupil circle P detected from each image frame stored in the image capture unit 44A.
  • FIG. 5 shows that as a result of the user 50 viewing the iris circle / pupil circle extraction result, it is confirmed that the iris circle I / pupil circle P has been extracted to the correct position by the apparatus, so that the iris 50 can be properly positioned. Since 51a is put together and it stops, it represents that the variation
  • FIG. 6 shows general transitions of the diameter (radius or diameter) of the iris circle I and pupil circle P detected from each image frame stored in the image capture unit 44A, the degree of focus, and the magnitude of the iris expression rate. It is shown.
  • the diameter (radius or diameter), focus degree, and iris expression rate of the iris circle I / pupil circle P tend to gradually increase because the eye 51 is opened wide until registration is completed.
  • the image selection unit 61 10 images are obtained based on the center coordinates of the iris circle I, the moving amount of the diameter, the size of the diameter of the iris 51a, the degree of focus, and the iris expression rate obtained from each of the images.
  • An image suitable for registration is automatically extracted from the inside based on the evaluation value.
  • the evaluation value is obtained for an image having a small value.
  • the diameter of the iris 52a As shown in FIG. 6, since the diameter of the iris 52a tends to gradually increase because the eye 52a is opened close to the eye until registration, a large value is obtained.
  • the evaluation value is increased for the image taken.
  • the iris expression rate has a large value because the iris expression rate tends to gradually increase since the eyes are opened wide open until registration. Increase the evaluation value for the image.
  • FIG. 7 shows the concept of the iris expression rate. Using the image of the iris portion of the target image frame, for example, the iris expression rate is obtained from the equation (1).
  • the degree of focus is large, since the degree of focus tends to gradually increase since the eye 51 is opened wide until registration is performed, as shown in FIG. 6. Increase the evaluation value for.
  • a method for obtaining the degree of focus for example, a generally known edge detection method or the like obtained by quantifying the edge strength of an image may be applied.
  • the evaluation value obtained from each feature amount is comprehensively determined, and the final registered image is selected.
  • the evaluation values may be summed up using one or more of each feature amount, or the final evaluation value may be obtained using an evaluation function with appropriate weighting according to each feature amount. May be calculated and determined based thereon.
  • the image selection unit 61 determines a registered image by the above-described method, but as a result of the determination, a plurality of images may be suitable. In this case, as long as it is determined to be suitable for registration, not only one but also a plurality of sheets may be extracted and registered.
  • the image selection unit 61 sends image data suitable for registration from the image capture unit 44A to the iris recognition unit 48.
  • the iris recognition unit 48 calculates iris data from the eye image, stores this iris data in the iris recognition dictionary 49, and completes registration.
  • the iris authentication apparatus main body 40A shown in FIG. 4 showing the second embodiment is configured to select an optimum image semi-automatically when the registration start key is pressed.
  • FIG. 8 is a diagram illustrating a display example of registration image selection in the third embodiment.
  • the image selection unit 61 automatically narrows down the images suitable for registration into several images by automatic selection, and the selected several images are displayed on the display screen under the control of the display control unit 45.
  • the state displayed in the display areas 46b-1 to 46b-4 of 46a is shown. Viewing this display screen 46a, the user 50 selects an eye image to be registered.
  • the image to be selected at this time is not necessarily one image, and a plurality of images can be selected.
  • the image data of the selected eye 51 is sent from the image capture unit 44A to the iris recognition unit 48.
  • the iris authentication unit 48 calculates iris data from the received eye image, stores the iris data in the iris recognition dictionary 49, and ends registration.
  • 4 images are automatically selected from 10 images, and the user 50 is allowed to select a registered image from the 4 images.
  • the number of base captured images may be appropriately increased or decreased, or the number of images to be automatically selected is not limited to four and may be set as appropriate.
  • various existing techniques can be applied to the interface such as icons on the display screen 46a for the user 50 to select a registered image.
  • the user 50 makes a final selection with respect to an eye image that is highly likely to be registered after the apparatus has selected images to a certain number in a semi-automatic manner. Therefore, even if the apparatus is selected by mistake, an optimal image can be selected from the viewpoints of both the apparatus and the user 50, so that a higher quality image can be surely registered.
  • the iris authentication apparatus main body 40A of FIG. 4 showing the second embodiment is configured to manually select the optimum image when the registration start key is pressed. That is, in the manner shown in FIG. 8 showing the third embodiment, all 10 images captured by the image capture unit 44A are displayed on the display screen 46a under the control of the display control unit 45, and the user 50 manually selects the images. In this configuration, an image to be used for final registration is selected.
  • the user 50 aligns the eye 51 with the camera 42a of the photographing unit 42, confirms the display content of the display screen 46a, and presses the registration start key. From the time when the registration start key is pressed, the stored image stored in the storage unit 44a of the image capture unit 44A is traced back, and all these images are displayed on the display screen 46a under the control of the display control unit 45. Viewing this screen, the user 50 selects an eye image to be registered.
  • the image to be selected at this time is not necessarily one. A plurality of images may be selected, or all images may be registered.
  • the image data of the selected eye 51 is sent from the image capture unit 44A to the iris recognition unit 48.
  • the iris authentication unit 48 calculates iris data from the received eye image, stores the iris data in the iris recognition dictionary 49, and ends registration.
  • 9A and 9B are a schematic configuration diagram and a functional block diagram of a portable iris authentication apparatus showing the fifth embodiment.
  • 9A is a schematic configuration diagram (outside view) of the portable iris authentication device
  • FIG. 9B is a functional block diagram of the iris authentication device main body in FIG. 9A.
  • a sound generation unit for example, a speaker
  • the front side that is, the front side of the housing unit 31.
  • FIG. 9B elements common to those in FIG. 1B showing the first embodiment are denoted by common reference numerals.
  • a control unit 70 is provided instead of the display control unit 45.
  • the speaker 32 generates sound under the control of the control unit 70.
  • a control unit 70 is connected to the speaker 32, the display unit 46, and the iris circle / pupil circle extraction unit 47.
  • the control unit 70 outputs the second control signal to control the display unit 46, and displays the extraction result of the iris circle / pupil circle by the iris circle / pupil circle extraction unit 47 on the display screen 46a.
  • the first control signal is output to the photographing unit 42 to control the photographing timing of the registered image, the eye is photographed by the camera 42a, and the first eye image is acquired. Generate sound such as counting of cues.
  • the iris circle / pupil circle extraction unit 47 is connected to a determination unit (for example, a stillness determination unit) 72, and a storage unit 74 such as a memory is connected to the stillness determination unit 72.
  • the stationary determination unit 72 is stable in fluctuations in the position (for example, central coordinates) and size (for example, either a radius or a diameter) of the iris circle and the pupil circle extracted by the iris circle / pupil circle extraction unit 47. Whether the variation is smaller than the variation widths W1 and W2 stored in the storage unit 74 or not is determined, and the determination result is given to the control unit 70. In the case of the determination result that the fluctuation is stable, the control unit 70 controls the shooting timing of the registration screen with respect to the shooting unit 42 by the second control signal.
  • a recognition unit (for example, iris recognition unit) 48 is connected to the image capture unit 44, and a registration unit (for example, iris recognition dictionary) 49 is further connected to the iris recognition unit 48.
  • the iris recognition unit 48 extracts the iris data from the first eye image captured by the image capture unit 44 at the time of registration and registers it in the iris recognition dictionary 49, and the second eye captured by the image capture unit 44 at the time of authentication. Iris data is extracted from the image, and the extracted iris data is compared with the iris data registered in the iris recognition dictionary 49 to recognize whether the user is the user.
  • Each component necessary for such an iris authentication function is configured by software incorporated in the iris authentication device main body 40 or an individual circuit.
  • 10A and 10B are diagrams showing a usage state in the portable iris authentication device 30 of FIG. 9A.
  • 10A is a side view showing a method of positioning the eye 61 within the imaging range of the portable iris authentication device 30 when the user 60 registers and authenticates the iris 61a of the eye 61
  • FIG. 10B is a part of FIG. 10A.
  • the symbol D is the distance between the eye 61 and the lens located near the focal length of the lens of the camera 42a
  • the symbol M is the movement angle of the eye 61 with respect to the optical axis of the camera 42a.
  • the eye 61 has a pupil 61b at the center of the iris 61a which is a black eye.
  • FIG. 11A and 11B are diagrams showing examples of screen display on the display screen 46a of FIG. 10A.
  • the display screen 46a is provided with a display area 46b in which an eye image can be displayed.
  • the iris circle I and the pupil circle P extracted from the iris 61a and the pupil 61b by the iris circle / pupil circle extraction unit 47 are displayed in the display area 46b. Is drawn.
  • the operation of the portable iris authentication apparatus 30 according to the fifth embodiment will be described below by dividing into (A) iris data registration operation and (B) iris authentication operation.
  • (A) Iris data registration operation When using the portable iris authentication device 30, as shown in FIG. 10A, the user 60 holds the casing 31 with a hand 62 and performs registration processing of the iris 61a.
  • the camera 42a of the photographing unit 42 is brought close to one eye 61 of the photographing unit 42, and a photographing start key (not shown) provided in the input unit 41 is pressed to start photographing.
  • the following two procedures (A1) a procedure for guiding the user to an appropriate photographing position, and (A2) an eye image photographing procedure in an optimal eye opening / closing state (that is, the user is brought into an optimal eye opening / closing state).
  • the iris data registration process is performed according to the guiding procedure.
  • the iris circle / pupil circle extraction unit 47 uses the iris circle I from the eye image captured by the image capture unit 44 during the registration operation of the user 60. And the pupil circle P is extracted sequentially. Under the control of the control unit 70, the iris circle I and the pupil circle P are superimposed on the eye image and sequentially displayed on the display screen 46a of the display unit 46, and the user 60 determines whether the iris 61a and the pupil 61b are correctly acquired. By facilitating visual recognition, the user 60 is guided to an appropriate photographing position. The procedure will be described in detail below.
  • the light source 43a of the illumination unit 43 emits light and irradiates the vicinity of the eye 61 from the start of the positioning operation of the eye 61 with respect to the camera 42a.
  • the camera 42a of the photographing unit 42 is activated, the vicinity of the eye 61 is photographed and an image is acquired, and the image capturing unit 44 starts capturing the image.
  • the eye image being aligned is sequentially displayed on the display screen 46 a of the display unit 46 under the control of the control unit 70.
  • the iris circle / pupil circle extraction unit 47 For each captured image captured by the image capture unit 44, the iris circle / pupil circle extraction unit 47 includes, in the image, an iris circle I and a pupil circle P, which are circular portions of the iris 61a and the pupil 61b. Is detected by the extraction process. As a method for detecting the circular shape of the iris 61a and the pupil 61b, for example, a general algorithm in the image processing field such as edge detection and Hough transform can be used. At this time, the iris circle / pupil circle extraction unit 47 stores the center coordinates and diameter data of the detected iris circle I / pupil circle P for one frame.
  • the control unit 70 displays the iris circle I and the pupil circle P in the display area 46b so as to overlap the captured image of the eye 61 as shown in the display screen 46a of FIG. 11A.
  • FIG. 11A shows a state in which the detected iris circle I and pupil circle P are completely coincident with the positions of the iris 61a and pupil 61b of the actual eye image.
  • the eye image at the time of such display is suitable for registration.
  • the display of the iris circle I and the pupil circle P is preferably drawn with a line having a color tone that is clearly distinguished from the eye image.
  • the detection of the iris circle I and the pupil circle P is performed correctly depending on the position of the eye 61 in the captured image displayed on the display screen 46a (that is, the movement angle M of the eye 61 with respect to the optical axis of the camera 42a), the detection of the iris circle I and the pupil circle P is performed correctly.
  • the positions of the iris circle I and the pupil circle P may not coincide with the eye 61 and the iris 61a / pupil 61b in the image.
  • the iris circle I and the pupil circle P are positively displayed on the display screen 46a even in such a case. Thereby, the user 60 can intuitively grasp that the iris 61a is not correctly detected.
  • (A2) Eye Image Shooting Procedure in Optimal Eye Open / Closed State This procedure is a procedure for guiding the user 60 to the optimal eye open / closed state.
  • the display screen 46a of the display unit 46 or the display screen 46a and the speaker 32 controlled by the control unit 70 is used as a trigger.
  • an iris image that is more suitable for registration is captured. The procedure will be described in detail below with reference to FIGS. 12A and 12B, FIG. 13, and FIGS. 14A and 14B.
  • FIG. 12A and 12B are diagrams showing the transition of the center coordinate of the iris circle I and the variation amount of the diameter in the state of FIG. 10A.
  • FIG. 13 is a diagram showing a display example for signaling the user 60 at the time of registration in the state of FIG. 10A.
  • FIGS. 14A and 14B are diagrams showing display examples for signaling the fine user 60 in FIG. 10A.
  • FIG. 14A is a diagram showing a display example of an instruction for a state in which the iris 61a in the black eye part is partially hidden by the eyelid
  • FIG. 14B is a table when shooting with the eyelid opened and the iris 61a in the black eye part fully exposed. It is a figure which shows an example.
  • the stillness determination unit 72 stores the center coordinates and diameter (radius or radius) of the iris circle I / pupil circle P of the previous frame stored in the iris circle / pupil circle extraction unit 47. From the diameter information and the center coordinates and diameter information of the iris circle I and pupil circle P of the current frame, the amount of change in how much the iris circle I and pupil circle P have changed from the previous frame (previous frame information and current frame) (Difference with information).
  • FIG. 12A and 12B show the transition of the center coordinate and the diameter variation of the iris circle I detected from each image frame by the stillness determination unit 72.
  • FIG. The stillness determination unit 72 performs the following determination process using the transition data of the variation amounts of the center coordinate and the diameter.
  • FIG. 12A shows a state in which the fluctuation amount of the center coordinate of the iris circle I in the previous frame and the current frame falls within the fluctuation width W1 that is less than or equal to the allowable fluctuation limit V1.
  • the allowable fluctuation range W1 of the central coordinate fluctuation amount is a numerical value (for example, several pixels) known from experience, and is stored in the storage unit 74 in advance.
  • FIG. 12B shows a state in which the variation amount of the diameter of the iris circle I falls within the variation range W2 that is less than or equal to the allowable variation limit V2. This is because, as with the amount of change in the central coordinates, the user 60 sees the result of the extraction of the iris circle I and the pupil circle P by the iris circle / pupil circle extraction unit 47, so that the iris circle I and the pupil circle P are the device.
  • the iris 61a is placed at a suitable position while changing the distance D between the lens of the camera 42a and the eye 61, and the amount of variation gradually decreases. Represents that.
  • the allowable fluctuation range W2 of the diameter fluctuation amount is also a numerical value known from experience (for example, several pixels) and is stored in the storage unit 74 in advance.
  • the stillness determination unit 72 monitors whether or not the value of the fluctuation amount of the center coordinate has changed for a certain time within the fluctuation range W1. Thus, when it is determined that the value of the fluctuation amount has changed for a certain time within the range of the fluctuation width W1, the iris circle I and the pupil circle P are stably detected at a level suitable for registration. Is considered. Accordingly, the stillness determination unit 72 instructs the control unit 70 to shoot a registration eye image for the user 60 by the display on the screen display 46a or the sound generated from the speaker 32 by the method described later. Give a signal.
  • the stationary determination unit 72 analyzes the transition of the fluctuation amount and determines whether the transition is stable. If it is determined that the value of the fluctuation amount has changed for a certain time within the range of the fluctuation width W2, the iris circle I and the pupil circle P are stably detected at a level suitable for registration. Is considered. Accordingly, the stillness determination unit 72 instructs the control unit 70 to shoot a registration eye image for the user 60 by the display on the screen display 46a or the sound generated from the speaker 32 by the method described later. Give a signal.
  • the above determination makes it possible to confirm that the user 60 is stationary at a position suitable for registration.
  • the user 61 is guided to open the eye 61 so that an image suitable for registration can be taken.
  • FIG. 13 shows a display example of a cue for taking a registration image.
  • the control unit 70 controls the display screen 46a of the display unit 46 to display a wording for shooting for registration.
  • the control unit 70 controls the shutter of the camera 42a of the shooting unit 42. The remaining time until it is automatically turned off is displayed. With the sound from the speaker 32, for example, the count display is reduced and displayed in accordance with the countdown to “3, 2, 1” or the like.
  • the shutter of the camera 42a of the photographing unit 42 is automatically turned off under the control of the control unit 70, and the eye 61 of the user 60 is photographed.
  • the captured eye image is captured by the image capture unit 44 and sent to the iris recognition unit 48.
  • the iris recognition unit 48 calculates iris data from the captured image and registers it in the iris recognition dictionary 51 as registration data for later authentication.
  • the above-described operation is particularly suitable for guiding a fine person (or a person who has narrowed his eyes temporarily) to take a good eye image, which is likely to be an image in which the eyelids are hung on the iris. .
  • FIGS. 14A and 14B show display examples of cues for photographing a registration image in the case of a detail.
  • FIG. 14A shows a state in which the eye 61 of the user 60 is fine, and the detected iris circle I and pupil circle P are superimposed on the eye image.
  • the iris circle I / pupil circle P in this case is determined to have a normal position and radius by the iris circle / pupil circle extraction unit 47.
  • a fine line since a part of the iris 62a is covered with the eyelid, even if the drawn iris circle I and pupil circle P are normal, they do not completely coincide with the actual iris part.
  • FIG. 14A a message that prompts the user 60 to open the eyes 61 wide is displayed.
  • the user 60 can widen the eyes 61 so that the actual iris portion coincides with the drawn iris circle I.
  • FIG. 14B shows a state in which the eye 61 is wide open and the actual iris portion coincides with the drawn iris circle I.
  • the remaining time until the shutter is automatically released is displayed, and the count display is also reduced in accordance with the countdown to “3, 2, 1”, etc. by voice. Is displayed.
  • the shutter of the camera 42a of the photographing unit 42 is automatically turned off simultaneously with completion of the countdown, and the eyes of the user 60 are photographed.
  • the drawn iris circle I and pupil circle P may be flashed and guided. Good.
  • the arc of the iris circle I that coincides with the iris portion photographed inside the details is drawn in a fixed manner, and only the portion hidden by the eyelid blinks so that the iris circle I switches from small to large. You may make it display and alert the user 60 to alignment.
  • the camera 42a of the photographing unit 42 is brought close to the front of one eye 61 of the user 60, and the camera 42a The eye 61 is positioned.
  • the user 60 presses a shooting start key (not shown) of the input unit 41 the eye 61 is irradiated by the light source 43a, and the eye 61 is shot by the camera 42a.
  • the captured eye image is captured by the image capture unit 44 and sent to the iris recognition unit 48.
  • the iris recognition unit 48 extracts the iris data from the captured image, compares it with the iris data registered in the iris recognition dictionary 51, and recognizes whether or not the user 60 is the user.
  • the position of the iris circle I and the pupil circle P displayed on the display screen 46a is always displayed superimposed on the actual eye image under the control of the control unit 70. It is possible to intuitively grasp whether the position of the eye 61 is correctly positioned.
  • the stationary determination unit 72 detects that the iris position is stable and instructs the photographing unit 42 to photograph the registered image, the eye image for registration is photographed. Therefore, an ideal iris 61a is photographed. As a result, even a user 60 who is not skilled in registration can register iris data from an ideal eye image, and as a result, the accuracy of iris recognition processing is improved.
  • the present invention is not limited to the above-described embodiments, and various usage forms and modifications are possible.
  • the present invention is not limited to this, and either the iris circle or the pupil circle is described. In this case, the same effect as when both are displayed can be obtained.
  • the iris authentication device main body 40, 40A is mounted on the mobile phone has been described.
  • the iris authentication device main body 40, 40A is mounted on another mobile terminal device such as a PDA (Personal Digital Assistant) or the iris authentication device main body 40, A fixed device structure in which the function of 40A is mounted on a personal computer or the like may be used.
  • the iris authentication device main bodies 40 and 40A may add other functional blocks other than those shown in the drawing in order to improve accuracy and expand applications.
  • Iris authentication apparatus 40 40A Iris authentication apparatus main body 41 Input part 42 Image

Abstract

Lors du traitement de l'enregistrement de données d'iris au niveau d'un dictionnaire de reconnaissance d'iris, pendant une période au cours de laquelle un opérateur aligne un œil, une unité d'extraction de cercle d'iris/cercle de pupille extrait successivement un cercle d'iris et un cercle de pupille d'une image d'œil qui est capturée par une unité de capture d'images. Le cercle de l'iris ou le cercle de la pupille est superposé sur l'image capturée sur la base de l'extraction et l'image superposée est affichée successivement sur un écran d'affichage pour qu'il soit facile de reconnaître visuellement si le cercle de l'iris et le cercle de la pupille sont acquis en une position correcte et si l'iris est détecté correctement. Lorsque l'opérateur confirme l'affichage pour juger que le cercle de l'iris ou le cercle de la pupille dessiné est compatible avec l'iris ou la pupille d'une image d'œil réelle, l'opérateur appuie sur une touche de début d'enregistrement au niveau de l'unité d'entrée et peut effectuer l'enregistrement.
PCT/JP2009/053513 2008-02-26 2009-02-26 Dispositif d'authentification de l'iris WO2009107704A1 (fr)

Applications Claiming Priority (4)

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JP2008-043838 2008-02-26
JP2008043838A JP2009205203A (ja) 2008-02-26 2008-02-26 虹彩認証装置
JP2008053250A JP2009211370A (ja) 2008-03-04 2008-03-04 虹彩認証装置
JP2008-053250 2008-03-04

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CN103544420A (zh) * 2013-08-15 2014-01-29 马建 用于智能眼镜的防伪虹膜身份认证方法
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CN103077385A (zh) * 2013-02-01 2013-05-01 杨勋 复合式虹膜识别方法及系统
CN103077385B (zh) * 2013-02-01 2016-03-02 杨勋 复合式虹膜识别方法及系统
CN103544420A (zh) * 2013-08-15 2014-01-29 马建 用于智能眼镜的防伪虹膜身份认证方法
WO2017000493A1 (fr) * 2015-06-30 2017-01-05 宇龙计算机通信科技(深圳)有限公司 Procédé et terminal de détection d'iris en personne
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