Iris encoding method, individual authentication method, iris code registration device, iris authentication device, and iris authentication program
First Claim
Patent Images
1. An iris code generation method, comprising the steps of:
- inputting a plurality of images;
detecting iris regions from the plurality of images;
transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of each of the detected iris regions;
performing band limitation on each of the coordinate-transformed images;
generating an iris code from each of the band-limited images;
rotationally compensating each of the generated iris codes in a circumferential direction; and
synthesizing the rotationally-compensated iris codes into a single iris code by determining a bit value of each bit based on a majority rule.
2 Assignments
0 Petitions
Accused Products
Abstract
In iris authentication, iris regions are extracted from a plurality of images (2a, 2b). The extracted iris regions are subjected to polar coordinate transformation (3a, 3b) and band limitation (4a, 4b). Thereafter, an iris code is generated from the coordinate-transformed, band-limited iris regions (5a, 5b). The iris code is subjected to rotational compensation (6a, 6b). A plurality of resultant iris codes are synthesized into a single iris code by determining the bit value of each bit based on a majority rule (7a, 7b).
-
Citations
12 Claims
-
1. An iris code generation method, comprising the steps of:
-
inputting a plurality of images;
detecting iris regions from the plurality of images;
transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of each of the detected iris regions;
performing band limitation on each of the coordinate-transformed images;
generating an iris code from each of the band-limited images;
rotationally compensating each of the generated iris codes in a circumferential direction; and
synthesizing the rotationally-compensated iris codes into a single iris code by determining a bit value of each bit based on a majority rule. - View Dependent Claims (4, 5, 12)
-
-
2. An iris code generation method, comprising the steps of:
-
inputting a plurality of images;
detecting iris regions from the plurality of images;
transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of each of the detected iris regions;
performing band limitation on each of the coordinate-transformed images;
rotationally compensating each of the band-limited images in a circumferential direction;
adding together the rotationally-compensated images to accumulate them as a single image; and
generating an iris code from the accumulated image.
-
-
3. An iris code generation method, comprising the steps of:
-
inputting a plurality of images;
detecting iris regions from the plurality of images;
transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of each of the detected iris regions;
rotationally compensating each of the coordinate-transformed images in a circumferential direction;
adding together the rotationally-compensated images to accumulate them as a single image;
performing band limitation on the accumulated image; and
generating an iris code from the band-limited image.
-
-
6. An iris code registration device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a band limitation section for performing band limitation on the coordinate-transformed image output from the polar coordinate transformation section;
an iris code generation section for generating an iris code from the band-limited image output from the band limitation section;
a rotational compensation section for rotationally compensating the iris code output from the iris code generation section in a circumferential direction;
an iris code synthesis section for receiving a plurality of rotationally-compensated iris codes output from the rotational compensation section and synthesizing the plurality of iris codes into a single iris code by determining a bit value of each bit based on a majority rule; and
an iris code registration section for registering the iris code output from the iris code synthesis section in a database.
-
-
7. An iris code registration device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a band limitation section for performing band limitation on the coordinate-transformed image output from the polar coordinate transformation section;
a rotational compensation section for rotationally compensating the band-limited image output from the band limitation section in a circumferential direction;
an image accumulation section for receiving a plurality of rotationally-compensated images output from the rotational compensation section and adding together the plurality of rotationally-compensated images to accumulate them as a single image;
an iris code generation section for generating an iris code from the image accumulated in the image accumulation section; and
an iris code registration section for registering the iris code output from the iris code generation section in a database.
-
-
8. An iris code registration device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a rotational compensation section for rotationally compensating the coordinate-transformed image output from the polar coordinate transformation section in a circumferential direction;
an image accumulation section for receiving a plurality of rotationally-compensated images output from the rotational compensation section and adding together the plurality of rotationally-compensated images to accumulate them as a single image;
a band limitation section for performing band limitation on the image accumulated in the image accumulation section;
an iris code generation section for generating an iris code from the image output from the band limitation section; and
an iris code registration section for registering the iris code output from the iris code generation section in a database.
-
-
9. An iris authentication device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a band limitation section for performing band limitation on the coordinate-transformed image output from the polar coordinate transformation section;
an iris code generation section for generating an iris code from the band-limited image output from the band limitation section;
a rotational compensation section for rotationally compensating the iris code output from the iris code generation section in a circumferential direction;
an iris code synthesis section for receiving a plurality of rotationally-compensated iris codes output from the rotational compensation section and synthesizing the plurality of iris codes into a single iris code by determining the bit value of each bit based on a majority rule; and
an iris code authentication section for comparing the iris code output from the iris code synthesis section with an iris code registered in a database to perform authentication.
-
-
10. An iris authentication device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a band limitation section for performing band limitation on the coordinate-transformed image output from the polar coordinate transformation section;
a rotational compensation section for rotationally compensating the band-limited image output from the band limitation section in a circumferential direction;
an image accumulation section for receiving a plurality of rotationally-compensated images output from the rotational compensation section and adding together the plurality of rotationally-compensated images to accumulate them as a single image;
an iris code generation section for generating an iris code from the image accumulated in the image accumulation section; and
an iris code authentication section for comparing the iris code output from the iris code generation section with an iris code registered in a database to perform authentication.
-
-
11. An iris authentication device, comprising:
-
an image input section;
an iris region extraction section for detecting an iris region from an image input to the image input section;
a polar coordinate transformation section for transforming coordinate system from a rectangular coordinate system to a polar coordinate system for an image of the iris regions obtained by the iris region extraction section;
a rotational compensation section for rotationally compensating the coordinate-transformed image output from the polar coordinate transformation section in a circumferential direction;
an image accumulation section for receiving a plurality of rotationally-compensated images output from the rotational compensation section and adding together the plurality of rotationally-compensated images to accumulate them as a single image;
a band limitation section for performing band limitation on the image accumulated in the image accumulation section;
an iris code generation section for generating an iris code from the image output from the band limitation section; and
an iris code authentication section for comparing the iris code output from the iris code generation section with an iris code registered in a database to perform authentication.
-
Specification