EP0973122A2
Expired / Lapsed
EP
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Iris Information Acquisition apparatus and iris identification apparatus
Assignee: Itoh Haruo
•
Filing: 1999-07-15
•
Granted: —
•
Expires: 2019-07-15
Abstract
Abstract An iris recognition system capable of remarkably reducing time taking from an image pickup of an iris image to generation of an iris code and of simplifying the construction is implemented. A sensor 10 comprises a group of pixels arranged in polar coordinates. An iris image is controlled so that the iris image is correctly formed on the sensor 10, particularly, the center of the iris image matches. The inner and outer diameters of the iris are detected according to the iris image formed on the sensor 10, and the difference between the inner diameter and the outer diameter in the radial direction is detected. The number i of pixels of each ring in the case of division into the predetermined number of concentric ring bands is calculated according to the difference. A weighted mean processing part 13 performs a weighted mean operation according to the number i of pixels. A band-pass filter 15 performs a processing in the tangential and radial directions of feature extraction of the iris image of each ring band and generates the iris code with a binary format formed by a binary circuit 16.
Inventors
- 👤 Haruo c/o Media Technology Corporation Ito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
G; G06; G06V; G06V40/00; G06V40/10; G06V40/18; G06V40/19; H; H04; H04N; H04N23/00; H04N23/60; H04N23/67; H04N25/00; H04N25/70; H04N25/702; H04N25/703; H04N25/708; A; A61; A61B; A61B3/00; A61B3/10; A61B3/12; A61B3/1216
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
79 words
An iris information sensor comprising an image pickup
sensor having a group of photoelectric conversion pixels
arranged in polar coordinates, wherein image light from an iris
region of an eye is focused on the image pickup sensor so that
the center of an iris image formed on the sensor substantially
matches with the pole of the polar coordinates of the sensor and
the photoelectric conversion pixels of the sensor are sequentially
scanned to read out an iris image signal.
Claim 2
Dependent Claim
26 words
An iris information acquisition apparatus as defined in
claim 1, wherein the image pickup sensor is made of a group of
pixels arranged in concentric circles.
Claim 3
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 1, wherein the image pickup sensor is made of a group of
pixels arranged in a spiral shape extending in the radial
direction.
Claim 4
Dependent Claim
73 words
An iris information acquisition apparatus as defined in
claim 1, wherein said image pickup sensor comprises a linear
sensor in which pixels are arranged in the radial direction and
rotation driving means for synchronously rotating the linear
sensor around the pole of the polar coordinates, and a function
equivalent to the group of the pixels of the polar coordinates is
achieved by the rotation of the linear sensor through the
rotation driving means.
Claim 5
Dependent Claim
31 words
An iris information acquisition apparatus as defined in
any one of claims 1-4, wherein each pixel constructing the
image pickup sensor is made of a MOS sensor or a CCD sensor.
Claim 6
Dependent Claim
33 words
An iris information acquisition apparatus as defined in
any one of claims 1-4, wherein each pixel constructing the
image pickup sensor is made of a device for detecting edge
information electrically or optically.
Claim 7
Dependent Claim
129 words
An iris information acquisition apparatus for obtaining
image information of an iris region, comprising: an image pickup sensor having a group of photoelectric
conversion pixels arranged in polar coordinates; image pickup optical system means for focusing image
light from the iris region on the image pickup sensor; optical axis operation control means for substantially
matching the center of an iris image formed on the sensor with
the pole of the polar coordinates of the sensor; region determination means for determining the iris
region by acquiring the inner and outer diameters of the iris
according to an iris image signal obtained by the sensor; and read scan means for scanning the determined iris region in
a predetermined sequence and obtaining an output value
corresponding to information of the iris region.
Claim 8
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 7, wherein said read scan means for scanning the
determined iris region scans the determined iris region at least
in the tangential direction.
Claim 9
Dependent Claim
35 words
An iris information acquisition apparatus as defined in
claim 7, wherein said read scan means for scanning the
determined iris region scans the determined iris region in the
tangential and radial directions every given width.
Claim 10
Dependent Claim
63 words
An iris information acquisition apparatus as defined in
claim 7, wherein said read scan means divides the determined
iris region into predetermined concentric ring bands and
determines the number of pixels of the radial direction of each
ring band and reads the output value corresponding to
information of each ring band in which weighted mean is
performed according to the number of pixels.
Claim 11
Dependent Claim
55 words
An iris information acquisition apparatus as defined in
claim 7, wherein said region determination means determines
the iris region according to amplitude of a feature extraction
signal, said feature extraction signal obtained by passing the
image signal through a band-pass filter, said image signal
obtained by scanning the image pickup sensor in the tangential
direction.
Claim 12
Dependent Claim
40 words
An iris information acquisition apparatus as defined in
claim 7, wherein said region determination means determines
the iris region according to level variation in the image signal
obtained by the scan in the radial direction of the image pickup
sensor.
Claim 13
Dependent Claim
108 words
An iris information acquisition apparatus as defined in
claim 7, wherein said optical axis operation control means
obtains the direction and size of an error between the center of
the iris image formed on the image pickup sensor and the pole
of the polar coordinates of the sensor to control a matching of
the center of the iris image with the pole of the polar
coordinates of the sensor, by further passing the feature
extraction signal through a low-pass filter, said feature
extraction signal obtained by passing the image signal through
the band-pass filter, said image signal obtained by scanning the
image pickup sensor in the tangential direction
Claim 14
Dependent Claim
81 words
An iris information acquisition apparatus as defined in
claim 7, further comprising illumination means for irradiating
illumination light to the eye and a group of light receiving
elements for receiving reflected light from the eye of the
illumination light, said optical axis operation control means
controlling a matching of the center of the iris image with the
pole of the polar coordinates of the image pickup sensor
according to an amount of receiving light of the group of light
receiving elements.
Claim 15
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 7, further comprising iris code generation means for
generating an iris code according to the output value read by
the read scan means.
Claim 16
Dependent Claim
39 words
An iris information acquisition apparatus as defined in
claim 15, wherein said iris code generation means comprises
comparison means for comparing a band-pass filter receiving
the output value and output of the band-pass filter with a
predetermined threshold value.
Claim 17
Dependent Claim
37 words
An iris information acquisition apparatus as defined in
claim 15, wherein said iris code generation means generates the
iris code by comparing the output value of a plurality of
continuous pixels with output of a target pixel.
Claim 18
Dependent Claim
64 words
An iris information acquisition apparatus as defined in
claim 7, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by moving a mirror placed in an optical
path between the eye of the iris of a subject and the sensor with
the pole of the polar coordinates of the sensor.
Claim 19
Dependent Claim
47 words
An iris information acquisition apparatus as defined in
claim 7, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by moving the sensor with the pole of the
polar coordinates of the sensor.
Claim 20
Dependent Claim
66 words
An iris information acquisition apparatus as defined in
claim 7, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by a vertical angle variable prism placed in
an optical path between the eye of the iris of a subject and the
sensor with the pole of the polar coordinates of the sensor.
Claim 21
Dependent Claim
67 words
An iris information acquisition apparatus as defined in
claim 7, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by mutually translating a plurality of
lenses placed in an optical path between the eye of the iris of a
subject and the sensor with the pole of the polar coordinates of
the sensor.
Claim 22
Dependent Claim
36 words
An iris information acquisition apparatus as defined in
claim 7, wherein pixel density in the radial direction of each
pixel of the image pickup sensor corresponds to the rate of
stretching and shrinking of the iris.
Claim 23
Dependent Claim
154 words
An iris information acquisition apparatus for obtaining
image information of an iris region of the eye, comprising: an image pickup sensor having a group of photoelectric
conversion pixels arranged in polar coordinates; image pickup optical system means for focusing image
light from the iris region on the image pickup sensor; illumination means for irradiating illumination light to
the eye having the iris; optical axis operation control means for substantially
matching the center of an iris image formed on the sensor with
the pole of the polar coordinates of the sensor; light adjustment control means for definitely controlling
the inner diameter of the iris image formed on the sensor by
irradiating visible light to the eye having the iris from the
illumination means and adjusting an amount of the light and
defining the pupil diameter; and read scan means for scanning the sensor in a
predetermined sequence and reading image information of the
iris region.
Claim 24
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 23, wherein said read scan means for scanning the
determined iris region scans the determined iris region at least
in the tangential direction.
Claim 25
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 23, wherein said read scan means for scanning the
determined iris region scans the determined iris region in the
tangential and radial directions.
Claim 26
Dependent Claim
41 words
An iris information acquisition apparatus as defined in
claim 23, wherein said image pickup optical system means
includes a zoom lens and definitely keeps the outer diameter of
the iris image formed on the image pickup sensor by the zoom
lens.
Claim 27
Dependent Claim
41 words
An iris information acquisition apparatus as defined in
claim 23, wherein each pixel of the image pickup sensor has a
light receiving region with an approximately rhombic shape
having each diagonal in the radial and tangential directions of
the polar coordinates.
Claim 28
Dependent Claim
40 words
An iris information acquisition apparatus as defined in
claim 23, wherein each pixel of the image pickup sensor is also
arranged in a region with an approximately rhombic shape
surrounded by the light receiving regions with the
approximately rhombic shape.
Claim 29
Dependent Claim
32 words
An iris information acquisition apparatus as defined in
claim 23, further comprising iris code generation means for
generating an iris code according to the output value read by
the read scan means.
Claim 30
Dependent Claim
39 words
An iris information acquisition apparatus as defined in
claim 29, wherein said iris code generation means comprises
comparison means for comparing a band-pass filter receiving
the output value and output of the band-pass filter with a
predetermined threshold value.
Claim 31
Dependent Claim
37 words
An iris information acquisition apparatus as defined in
claim 29, wherein said iris code generation means generates the
iris code by comparing the output value of a plurality of
continuous pixels with output of a target pixel.
Claim 32
Dependent Claim
74 words
An iris information acquisition apparatus as defined in
claim 23, further comprising a group of light receiving elements
for receiving reflected light from the eye of light irradiated by
said illumination means, said optical axis operation control
means controlling a matching of the center of the iris image
with the pole of the polar coordinates of the image pickup
sensor according to an amount of receiving light of the group of
light receiving elements.
Claim 33
Dependent Claim
108 words
An iris information acquisition apparatus as defined in
claim 23, wherein said optical axis operation control means
obtains the direction and size of an error between the center of
the iris image formed on the image pickup sensor and the pole
of the polar coordinates of the sensor to control a matching of
the center of the iris image with the pole of the polar
coordinates of the sensor, by further passing the feature
extraction signal through a low-pass filter, said feature
extraction signal obtained by passing the image signal through
the band-pass filter, said image signal obtained by scanning the
image pickup sensor in the tangential direction.
Claim 34
Dependent Claim
64 words
An iris information acquisition apparatus as defined in
claim 23, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by moving a mirror placed in an optical
path between the eye of the iris of a subject and the sensor with
the pole of the polar coordinates of the sensor.
Claim 35
Dependent Claim
47 words
An iris information acquisition apparatus as defined in
claim 23, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by moving the sensor with the pole of the
polar coordinates of the sensor.
Claim 36
Dependent Claim
66 words
An iris information acquisition apparatus as defined in
claim 23, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by a vertical angle variable prism placed in
an optical path between the eye of the iris of a subject and the
sensor with the pole of the polar coordinates of the sensor.
Claim 37
Dependent Claim
67 words
An iris information acquisition apparatus as defined in
claim 23, wherein said optical axis operation control means
controls a matching of the center of the iris image formed on the
image pickup sensor by mutually translating a plurality of
lenses placed in an optical path between the eye of the iris of a
subject and the sensor with the pole of the polar coordinates of
the sensor.
Claim 38
Dependent Claim
203 words
An iris identification apparatus for acquiring an iris code
representing information of an iris region of the eye and
comparing and matching the acquired iris code with a
previously registered iris code, comprising: an image pickup sensor having a group of photoelectric
conversion pixels arranged in polar coordinates; image pickup optical system means for focusing image
light from the iris region on the image pickup sensor; optical axis operation control means for substantially
matching the center of an iris image formed on the sensor with
the pole of the polar coordinates of the sensor; region determination means for determining the iris
region by acquiring the inner and outer diameters of the iris
according to an iris image signal obtained by the sensor; read scan means for dividing the determined iris region
into predetermined concentric ring bands and determining the
number of pixels of the radial direction of each ring band and
reading the output value corresponding to information of each
ring band in which weighted mean is performed according to
the number of pixels; iris code generation means for generating the iris code
according to the output value; and comparison means for matching the generated iris code
with the previously registered iris code.
Claim 39
Dependent Claim
24 words
An iris identification apparatus as defined in claim 38,
wherein said matching means matches the iris region including
a region hidden by the eyelids.
Claim 40
Dependent Claim
35 words
An iris identification apparatus as defined in claim 38,
further comprising a nonvolatile memory for storing the
previously registered iris code, and means for encoding or
ciphering the matched result in order to secure security.
Claim 41
Dependent Claim
30 words
An iris identification apparatus as defined in claim 40,
further comprising means for adjusting identification
determination level used when matching the generated iris code
with the previously registered iris code.
Claim 42
Dependent Claim
201 words
An iris identification apparatus for acquiring information
of an iris region of the eye and comparing and matching the
acquired information of the iris region with information of an
iris region registered previously, comprising: an image pickup sensor having a group of photoelectric
conversion pixels arranged in polar coordinates; image pickup optical system means for focusing image
light from the iris region on the image pickup sensor; illumination means for irradiating illumination light to
the eye having the iris; optical axis operation control means for substantially
matching the center of an iris image formed on the sensor with
the pole of the polar coordinates of the sensor; light adjustment control means for definitely controlling
the inner diameter of the iris image formed on the sensor by
irradiating visible light to the eye having the iris from the
illumination means and adjusting an amount of the light and
defining the pupil diameter; read scan means for scanning the sensor in the tangential
and radial directions and reading the information of the iris
region; and matching means for matching the information of the iris
region read by the read scan means with the information of the
iris region registered previously through pattern matching.
Claim 43
Dependent Claim
40 words
An iris identification apparatus as defined in claim 42,
wherein said image pickup optical system means includes a
zoom lens and definitely keeps the outer diameter of the iris
image formed on the image pickup sensor by the zoom lens.
Claim 44
Dependent Claim
24 words
An iris identification apparatus as defined in claim 42,
wherein said matching means matches the iris region including
a region hidden by the eyelids.
Claim 45
Dependent Claim
35 words
An iris identification apparatus as defined in claim 42,
further comprising a nonvolatile memory for storing the
previously registered iris code, and means for encoding or
ciphering the matched result in order to secure security.
Claim 46
Dependent Claim
25 words
An iris identification apparatus as defined in claim 42,
further comprising means for adjusting identification
determination level used when said matching means performs
said matching.
Claim 47
Dependent Claim
199 words
An iris identification method for acquiring an iris code
representing information of an iris region of the eye and
comparing and matching the acquired iris code with a
previously registered iris code, comprising the steps of: using an image pickup sensor having a group of
photoelectric conversion pixels arranged in polar coordinates; focusing image light from the iris region on the image
pickup sensor through image pickup optical system means; substantially matching the center of an iris image formed
on the sensor with the pole of the polar coordinates of the sensor
through optical axis operation control means; determining the iris region by acquiring the inner and
outer diameters of the iris according to an iris image signal
obtained by the sensor; dividing the determined iris region into predetermined
concentric ring bands and determining the number of pixels of
the radial direction of each ring band and reading the output
value corresponding to information of each ring band in which
weighted mean is performed according to the number of pixels; generating the iris code from the output value through iris
code generation means; and performing personal identification by matching the
generated iris code with the previously registered iris code.
Claim 48
Dependent Claim
201 words
An iris identification method for acquiring information of
an iris region of the eye and comparing and matching the
acquired information of the iris region with information of an
iris region registered previously, comprising the steps of: using an image pickup sensor having a group of
photoelectric conversion pixels arranged in polar coordinates; focusing image light from the iris region on the image
pickup sensor through image pickup optical system means; irradiating illumination light to the eye having the iris
through illumination means; substantially matching the center of an iris image formed
on the sensor with the pole of the polar coordinates of the sensor
through optical axis operation control means; definitely controlling the inner diameter of the iris image
formed on the sensor by irradiating visible light to the eye
having the iris from the illumination means and adjusting an
amount of the light and defining the pupil diameter; scanning the sensor in the tangential and radial directions
and reading the information of the iris region through read scan
means; and performing personal identification by matching the
information of the iris region read by the read scan means with
the information of the iris region registered previously through
pattern matching.
Claim 49
Dependent Claim
40 words
An iris identification method as defined in claim 48,
wherein said image pickup optical system means includes a
zoom lens and definitely keeps the outer diameter of the iris
image formed on the image pickup sensor by the zoom lens.
References Cited (Backward Citations)
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