WO2002033962A1 - Appareil de formation d"images iriennes - Google Patents
Appareil de formation d"images iriennes Download PDFInfo
- Publication number
- WO2002033962A1 WO2002033962A1 PCT/JP2001/008889 JP0108889W WO0233962A1 WO 2002033962 A1 WO2002033962 A1 WO 2002033962A1 JP 0108889 W JP0108889 W JP 0108889W WO 0233962 A1 WO0233962 A1 WO 0233962A1
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- WO
- WIPO (PCT)
- Prior art keywords
- iris
- wide
- camera
- image
- angle camera
- Prior art date
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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
- G06V40/19—Sensors therefor
-
- 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
Definitions
- the present invention relates to an iris image pickup apparatus for picking up an iris image used for personal authentication of a security system, and more particularly to an iris image pickup apparatus suitable for picking up an iris image at high speed with a low-cost apparatus configuration. Background technology)
- a method of performing authentication using a ripple of an individual iris is known.
- This authentication method using an iris has the advantage that, unlike fingerprints, it is possible to use a camera from a location that is not in contact with the iris and that is far away, and is expected to become widely used in the future.
- the image of the iris used for personal authentication needs to be a clear and focused image in order to increase the recognition rate, and must be captured within a short time when the person to be authenticated is stationary. There is a restriction that it must be.
- a conventional iris imaging device satisfying the above-mentioned restrictions, for example, as described in Japanese Patent Application Laid-Open No. 2000-23946, there is a device using two types of cameras, a wide-angle camera and a narrow-angle force camera.
- this conventional iris imaging device first, a face image is recognized by pattern matching or the like from an image of a subject person captured by a wide-angle camera, and the position of the right eye or the left eye is determined from the face image.
- the camera is pointed in the direction of the iris, and the iris is focused with high precision using autofocus technology.
- the conventional iris image pickup device prepares two wide-angle cameras and arranges the wide-angle cameras on the left and right with the narrow angular force camera as the center. ) Can be calculated with high accuracy.
- the image of the face needs to be included in the image captured by the wide-angle camera. As shown in Fig.
- the object is to provide a wide-angle camera that captures an image of a subject, a range finder that measures the distance to the subject, and an iris of the subject that is obtained from an image captured by the wide-angle camera and a measurement value of the range finder. This is achieved by providing the iris imaging device with a telephoto camera that captures an enlarged image of the iris.
- An object of the present invention is also an iris imaging apparatus comprising: a wide-angle camera for capturing an image of a subject; and a telephoto camera for focusing on the iris of the subject and capturing an enlarged image of the iris obtained from the image captured by the wide-angle camera. This is achieved by arranging the long sides of the rectangular image sensor provided in the wide-angle camera in the same direction as the height direction of the subject, and mounting the wide-angle camera on a tilt table.
- the image sensor of the wide-angle camera vertically, the usability of including the image of the entire head of the subject in the image captured by the wide-angle camera is increased. For this reason, re-taking by the wide-angle camera is reduced, and iris images can be acquired at high speed.
- the wide-angle camera by mounting the wide-angle camera on the tilt table, it is possible to make adjustments so that the entire head of the object is included in the image captured by the wide-angle camera. For this reason, it is possible to take a large image so that the image of the subject is full in the image taken by the wide-angle camera.
- the calculation accuracy of the iris position obtained from the captured image is high, and by adjusting the direction of the telephoto camera (pan position and tilt position) based on the calculated iris position, a high-accuracy iris image can be obtained quickly. It is possible to do.
- An object of the present invention is to provide an iris imaging apparatus comprising: a wide-angle camera that captures an image of a subject; and a telephoto camera that focuses on the iris of the subject obtained from the image captured by the wide-angle camera and captures an enlarged image of the iris.
- the telephoto camera wherein an optical axis is disposed coaxially with a rotation axis of the tilt table on a tilt table; and the telescope is disposed on the front of the telephoto camera and reflects light emitted from the iris to reflect the telephoto signal. This is achieved by mounting a pan mirror for entering the power camera and the wide-angle camera arranged so that an optical axis intersects the rotation axis.
- the parallax in the vertical direction is eliminated, and the vertical direction (the rotation axis direction of the tilt table) is eliminated. Since only the parallax of) remains, it was determined from the image captured by the wide-angle camera.
- the iris position data can be easily converted to the telescope camera coordinate data, and the time from when the wide-angle camera captures the image to when the telescope camera captures the iris can be shortened.
- a long side of a rectangular imaging device provided in the wide-angle camera is arranged in the same direction as the height direction of the subject, and a short side of a rectangular imaging device provided in the telephoto camera. Are preferably arranged in the same direction as the height of the subject.
- the image sensor of the wide-angle camera when the image sensor of the wide-angle camera is arranged vertically, as described above, the probability that the entire head of the object enters the captured image increases, and when the image sensor of the telephoto camera is arranged horizontally, The imaging screen becomes longer in the direction in which parallax occurs between the two cameras. Therefore, it is possible to increase the probability that the iris image enters the imaging screen.
- one of the pivots of the tilt base is directly connected to an output shaft of a tilt motor so that the tilt base is directly tilt-operated by the tilt motor.
- the tilt base is driven to the target position by a tilt motor such as a steering motor, and after stopping the tilt base, an enlarged image of the iris is captured by a telephoto camera, but immediately after the tilt base is stopped, the tilt base vibrates. Therefore, it is necessary to wait until this vibration disappears before taking an image with a telephoto camera.
- a tilt motor such as a steering motor
- the tilt base vibrates. Therefore, it is necessary to wait until this vibration disappears before taking an image with a telephoto camera.
- a stop member is provided to press the vibration damping member against the other pivot when the iris imaging device is transported, and to disable the pivot.
- FIG. 1 is a front view of an iris imaging device according to an embodiment of the present invention with an outer panel removed.
- FIG. 2 is a perspective view of the iris imaging device shown in FIG.
- FIG. 3 is a sectional view taken along the line III-III in FIG.
- FIG. 4 is a sectional view taken along the line IV-IV in FIG.
- FIG. 5 is a diagram showing a vibration state when the tilt base is decelerated at a low speed (a), suddenly braked (b), and damped (b).
- FIG. 6 is a circuit diagram of an electric system of the iris imaging device shown in FIG.
- Fig. 7 is a flowchart showing the operation procedure of the iris imaging device shown in Fig. 1.
- Fig. 8 is a diagram showing an imaging state of a wide-angle camera.
- FIG. 9 is a diagram illustrating the influence of parallax in the horizontal direction between the wide-angle camera and the telephoto camera.
- FIG. 10 is a diagram showing an image pickup state by a telephoto camera.
- FIG. 11 is a diagram showing a state in which the face portion is interrupted in the image captured by the wide-angle camera.
- Reference numerals in the figure 10 denotes an iris image pickup device, 12, 13 denotes an iris illumination device with a pan / tilt function, 14, 15 denotes a fixed illumination device for a wide-angle camera, 16, 17 denotes a support plate, and 20 denotes a tilt stand.
- 21 is a tilting motor
- 22 is a telephoto camera (narrow-angle camera) for iris imaging
- 23 is a panning mirror
- 24 is a rangefinder
- 25 is a wide-angle camera
- 26 is a panning motor
- 20a, 20 b is the pivot of the tilt stand
- 30 is the control unit
- 40 is the vibration damping device.
- FIG. 1 is a front view of an iris imaging device according to an embodiment of the present invention
- FIG. 2 is a perspective view thereof.
- the iris imaging device 10 includes a long fixed base 11.
- Iris illuminators 12, 13 are attached to the left and right ends of the fixed base 11, respectively.
- Each of the iris illuminators 1 and 13 is equipped with a condenser lens that collects and illuminates infrared light to the iris and illuminates the illumination pan in the iris direction.
- I2a, 13a and illumination tilt monitors 12b, 13b are provided.
- a wide-angle turtle Lighting fixtures 14 and 15 are installed inside each of the iris lighting devices 12 and 13 (the center side of the fixed base 11).
- the lighting fixtures 14 and 15 are configured as a set of a large number of light emitting diodes. However, in the perspective view of FIG. 2, illustration of each light emitting diode is omitted, and only a mounting plate for mounting a light emitting diode is illustrated.
- the lighting fixtures 14 and 15 need only be able to uniformly illuminate a wide area with infrared light (because panning and tilting operations are not necessary). No lens is provided.
- a support plate 16 stands on the fixed base 11 inside the lighting fixture 14 (center side of the fixed base 11), and a support plate inside the lighting fixture 15 (center side of the fixed base 11). 17 is erected on the fixed base 1 1.
- a tilt table 20 is mounted between the support plates 16 and 17.
- the tilt table 20 has left and right pivots 20a and 20b, respectively, and the pivots 20a and 2ob are rotatably supported by support plates 16 and 17, respectively.
- One pivot 20a is directly connected to the rotation axis of the tilt motor 21 attached to the support plate: L6, and the other pivot 20b is attached with a vibration damping device 40, which will be described in detail later. Have been.
- the tilt table 20 is equipped with a telephoto camera (narrow-angle camera) 22, a pan mirror 23, a rangefinder 24, a wide-angle camera 25, and a pan motor 26. .
- the telephoto camera 22 is disposed on the side of the support 17 of the tilt base 20 so that its optical axis is coaxial with the rotation axis of the tilt base 20.
- the pan mirror 23 is arranged at the front position of the telephoto camera 22, and the light reflected by the pan mirror 23 is incident on the telephoto camera 22, and the pan mirror ⁇ "2 Numeral 3 is rotatable around an axis perpendicular to the optical axis of the telephoto camera 22, that is, in the double-headed arrow A direction in FIG.
- a pan motor 26 that drives the pan mirror 23 in the direction of arrow A is attached to the support plate 16 side of the tilt base 20 and drives the pan mirror 23 through a link mechanism 27. Configuration.
- the distance meter 24 is driven in the direction of arrow A in conjunction with the pan mirror 23, and constantly irradiates the subject with infrared light from directly in front of the object to enable highly accurate distance measurement.
- the distance meter 24 can also be driven by the pan motor 26 via the link mechanism 27.
- the wide-angle camera 25 is disposed between the pan mirror 23 and the pan motor 26, The optical axis is provided at a position crossing the rotation axis of the tilt table 20.
- the vertical direction of the wide-angle camera 25 and the telephoto lens 22 (the rotation axis direction of the tilt table 20 is the horizontal direction (horizontal direction)), that is, the height direction of the subject person is the vertical direction.
- the parallax of) is lost, and only the parallax in the horizontal direction is obtained.
- the imaging device such as a CCD mounted in the wide-angle camera 25 is rectangular, but is arranged in the wide-angle camera 25 such that its long side is vertical and its short side is horizontal. As a result, the imaging screen of the wide-angle camera 25 becomes vertically long.
- the image pickup device such as a CCD mounted in the telephoto camera 22 is also rectangular, but its position is different from that of the wide-angle camera 25 so that the long side is horizontal and the short side is vertical. Be placed. As a result, the imaging screen of the telephoto camera 22 becomes horizontally long, that is, a screen that is long in the direction in which the parallax occurs.
- FIGS. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.
- the metal pivot 20 b rotatably supported by the support plate 17 penetrates the support plate 17 and protrudes to the opposite side, and the vibration damping device 40 projects It is provided below the pivot 20b.
- the vibration damping device 40 includes a cylindrical main body 41, a resin vibration damping member 43 guided by sliding through a central through hole 42 of the main body 41, and a vibration damping member 4.
- 3 Expanding head 4 3 Pressing the U-groove of 3a to the pivot 20b with a predetermined panel pressure, and a stop panel screwed into a position separated from the vibration damping member 43 at normal times. And a screw 4 5 as a part.
- the tilt table 20 is moved to a predetermined position and stopped, but if it is slowly decelerated and stopped, as shown in FIG. 5 (a), not so large vibration occurs.
- the vibration of the tilt table 20 increases as shown in FIG. 5 (b).
- the large vibration causes the captured image to be blurred, so it is necessary to wait until the vibration disappears.
- the tilt table 20 cannot be operated at high speed due to the rapid acquisition of the iris image. Therefore, in the present embodiment, the U-groove (groove matched to the peripheral surface shape of the pivot 20 b) provided on the enlarged head 43 a by the resilience of the resilient panel 44.
- Fig. 5 (c) by constantly pressing the shaft against the pivot 2Ob, the occurrence of vibration after sudden braking is suppressed. This enables high-speed operation of the tilt table 20.
- the outer diameter of the pivot 20b is larger than that of the pivot 20a.
- the vibration damping device 40 can be used also for locking the tilt stand 20.
- the vibration damping device 40 can be used also for locking the tilt stand 20.
- expensive components such as a camera mounted on the tilt base 20 may be damaged.
- a person inserts a screwdriver or the like from the through hole 11a provided in the bottom of the fixing base 11 and screws the screw 45 in the direction of the damping member 43.
- FIG. 6 is a circuit diagram of an electric system of the iris imaging device shown in FIG.
- the control unit 30, not shown in FIG. 1 has a distance between the captured image (electronic image) of the wide-angle camera 25 mounted on the tilt table 20 and the captured image (electronic image) of the telephoto camera 22.
- the pan motor 26 and the tilt motor 21 are driven and controlled via the motor control unit 31 as well as the illumination pan motor 12 a (1 3 a) and the illumination tilt motor 1 2 b.
- FIG. 7 is a flowchart showing an operation procedure of the iris imaging device.
- step S1 it waits for a subject (person to be authenticated) to enter a predetermined range in front of the iris imaging device.
- the motors 21, 26, 12 a, 13 a, 12 b, and 13 b are at the default position (home position), respectively, and the distance meter 24 is also facing the front position as the default position.
- the range finder 24 emits infrared light at all times during standby or at predetermined intervals, and the control unit 30 shown in FIG. 6 determines the presence of the subject based on whether there is reflected light or not. .
- the distance to the subject is measured by the distance meter 24 based on the reflected light (step S2), and the process proceeds to the next step S3.
- this iris imaging device is applied to an ATM at a bank or the like, the standby process of the subject in step S1 can be replaced with the standby process of starting the ATM operation of a person.
- step S3 imaging is performed by the wide-angle camera 25.
- the lighting devices 14 and 15 for the wide-angle camera are turned on.
- step S4 the control unit 30 determines whether or not a face is included in the captured image by pattern matching processing. If no face is included, the tilt motor 21 The tilt operation is performed by outputting a drive command via the motor controller 31 (step S5), and the image captured by the wide-angle camera is captured again in step S3.
- step S5 the tilt motor controller 31
- the image sensor of the wide-angle camera 25 is arranged vertically, as shown in FIG. 8, the probability that the face of the subject person 52 enters the wide-angle camera image screen 51 is high, In addition, since the optical axis of the wide-angle camera can be moved up and down by tilting, it is possible to easily capture a face image.
- step S6 If the pattern of the face is included in the image captured by the wide-angle camera, the process proceeds from step S4 to step S6, and the tilt table 2 is set so that the face becomes the center of the image captured by the wide-angle camera.
- the tilt operation of 0 is performed, the pan position and the tilt position of the iris illumination devices 12 and 13 in FIG. 1 are also adjusted, and the illumination light irradiation direction is set in advance so that the illumination light is emitted to the face.
- the pan mirror 23 is also turned in advance so that the telephoto camera 22 can take an image of the face.
- the control unit 30 detects the position of the left or right eye from the image captured by the wide-angle camera captured in step S7. From the image captured by the wide-angle camera, the direction in which the eye exists can be known, but the distance to the captured "eye" is not known. If this distance is not known, the wide-angle camera 25 and the telephoto camera 22 have a parallax in the horizontal direction as described above, and as shown in FIG. The iris image position on the screen is shifted. Since there is aberration in the camera lens, it is preferable that the iris image be located at the center of the captured image in order to obtain an iris image with high authentication accuracy (image 53 in FIG. 9). Therefore, the control unit 30 calculates the position of the eye to be imaged, also using the measured value of the distance meter measured in step S2.
- the control unit 30 converts the eye position obtained in step S8 into coordinates of the telephoto camera 22.
- the tilt table 20 is adjusted precisely so that the telephoto camera 22 can perceive the iris with high precision, and at the same time, the focused illuminating light of the iris illuminators 12 and 13 can be applied to the iris.
- the tilt position and the precise pan position of the pan mirror 23 and the precise tilt position and pan position of the illuminators 12 and 13 are obtained, and the tilt position and the pan position are finely adjusted (step S9).
- the distance to the iris is measured by the distance meter 24. Since the measuring direction of the distance meter 24 is adjusted in conjunction with the pan position adjustment of the pan mirror 23, the measuring infrared light is emitted toward the iris, and is reflected by, for example, ⁇ under the eyes By receiving the reflected light, the distance to the iris can be measured with high accuracy.
- step S11 the distance to the iris measured in step S10 is preset in the telephoto camera 22.
- a focus lens (not shown) is rapidly driven so as to focus on the distance, and thereafter, the iris is focused by a normal automatic focusing (AF) technique.
- AF normal automatic focusing
- Step by step acquire the image 55 with the telephoto camera 22 as shown in Fig. 10, and position the focus lens where the ⁇ frequency component in the image is the highest. Is the in-focus position, and the captured image obtained at that time is obtained as an iris image to be authenticated.
- the control unit 30 turns on one or both of the iris illuminators 12 and 13. Then, the color image at the in-focus position is passed to an authentication device (not shown), Return to step S1.
- the apparatus configuration is simplified and the manufacturing cost is reduced.
- the focus position of the telephoto camera can be quickly adjusted based on the measurement values of the rangefinder up to the subject, and then the focus position can be searched by the autofocus technology.
- the iris image can be adjusted to the center of the captured image by adjusting the position where the telephoto camera shakes based on the measurement values of the rangefinder, so that an accurate iris image can be obtained in a short time. .
- the image sensor of the wide-angle camera since the image sensor of the wide-angle camera is arranged vertically, the usability of including the image of the entire head of the subject in the image captured by the wide-angle camera is increased. For this reason, re-taking by the wide-angle camera is reduced, and iris images can be acquired at high speed. Further, by mounting the wide-angle camera on the tilt table, it is possible to make adjustments so that the entire head of the subject is included in the image captured by the wide-angle camera. For this reason, it is possible to capture a large image so that the image of the subject is full in the captured image of the wide-angle camera. Therefore, the calculation accuracy of the iris position calculated from the captured image is high, and by adjusting the direction (pan position or tilt position) of the telephoto camera based on the calculated position, a quick and highly accurate iris image can be obtained. It becomes possible to acquire.
- the optical axis of the wide-angle camera and the optical axis of the telephoto camera are arranged so as to intersect on the same plane, there is no vertical parallax between the two cameras. Since only the parallax in the direction is obtained, the iris position data obtained from the image captured by the wide-angle camera can be easily converted to the coordinate data of the telephoto camera (the calculation time is short), and imaging by the wide-angle camera can be performed. It is possible to shorten the time from when the iris is picked up by the telephoto camera.
- a mechanical shake mechanism (vibration damping device 40) is provided for the rotation of the tilt base to suppress the generation of vibration. Braking can be performed, and the eleven questions up to iris image acquisition can be shortened.
- an inexpensive two-camera iris imaging device that can acquire a high-precision iris image in a short time and has a low power of one wide-angle camera and one telephoto camera. Becomes possible.
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Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020027007663A KR20020070993A (ko) | 2000-10-16 | 2001-10-10 | 홍채 촬상 장치 |
EP01976654A EP1333667A4 (en) | 2000-10-16 | 2001-10-10 | APPARATUS FOR FORMING IRIAN IMAGES |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000315254A JP2002125142A (ja) | 2000-10-16 | 2000-10-16 | 虹彩撮像装置 |
JP2000-315254 | 2000-10-16 |
Publications (1)
Publication Number | Publication Date |
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WO2002033962A1 true WO2002033962A1 (fr) | 2002-04-25 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2001/008889 WO2002033962A1 (fr) | 2000-10-16 | 2001-10-10 | Appareil de formation d"images iriennes |
Country Status (5)
Country | Link |
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US (1) | US20020191076A1 (ja) |
EP (1) | EP1333667A4 (ja) |
JP (1) | JP2002125142A (ja) |
KR (1) | KR20020070993A (ja) |
WO (1) | WO2002033962A1 (ja) |
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JPH10137225A (ja) * | 1996-11-15 | 1998-05-26 | Oki Electric Ind Co Ltd | 生体の特徴を用いた個人認識装置およびこの個人認識装置を用いた自動取引システム |
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FR2689355B1 (fr) * | 1992-03-30 | 1995-10-20 | Kis Photo Ind | Installation automatique integree pour la realisation de photographies ou de sequences de photographies. |
WO1997021188A1 (en) * | 1995-12-04 | 1997-06-12 | David Sarnoff Research Center, Inc. | Wide field of view/narrow field of view recognition system and method |
US6320610B1 (en) * | 1998-12-31 | 2001-11-20 | Sensar, Inc. | Compact imaging device incorporating rotatably mounted cameras |
US5717512A (en) * | 1996-05-15 | 1998-02-10 | Chmielewski, Jr.; Thomas A. | Compact image steering and focusing device |
US6041195A (en) * | 1996-07-24 | 2000-03-21 | Minolta Co., Ltd. | Camera capable of video and film shooting having optical viewfinder |
US5956122A (en) * | 1998-06-26 | 1999-09-21 | Litton Systems, Inc | Iris recognition apparatus and method |
JP3602389B2 (ja) * | 1999-10-15 | 2004-12-15 | 株式会社ストロベリーコーポレーション | 折り畳み携帯式電話の枢着構造 |
US6384863B1 (en) * | 2000-10-11 | 2002-05-07 | Hewlett-Packard Company | Ergonomically designed digital camera capable of being held by one hand |
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2000
- 2000-10-16 JP JP2000315254A patent/JP2002125142A/ja active Pending
-
2001
- 2001-10-10 EP EP01976654A patent/EP1333667A4/en not_active Withdrawn
- 2001-10-10 KR KR1020027007663A patent/KR20020070993A/ko not_active Application Discontinuation
- 2001-10-10 WO PCT/JP2001/008889 patent/WO2002033962A1/ja not_active Application Discontinuation
- 2001-10-10 US US10/149,884 patent/US20020191076A1/en not_active Abandoned
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JPH0272297A (ja) * | 1988-09-05 | 1990-03-12 | Sony Corp | 雲台 |
JPH10137225A (ja) * | 1996-11-15 | 1998-05-26 | Oki Electric Ind Co Ltd | 生体の特徴を用いた個人認識装置およびこの個人認識装置を用いた自動取引システム |
JP2000023946A (ja) * | 1998-07-10 | 2000-01-25 | Matsushita Electric Ind Co Ltd | 虹彩撮像装置および虹彩撮像方法 |
JP2001257927A (ja) * | 2000-03-09 | 2001-09-21 | Technosonic:Kk | 被写体追尾装置 |
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Also Published As
Publication number | Publication date |
---|---|
EP1333667A1 (en) | 2003-08-06 |
EP1333667A4 (en) | 2006-12-27 |
US20020191076A1 (en) | 2002-12-19 |
KR20020070993A (ko) | 2002-09-11 |
JP2002125142A (ja) | 2002-04-26 |
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