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, comprisinga processor to perform 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 that selects a bit value of the single iris code based on a majority occurrence of bit values in the iris codes.
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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).
66 Citations
12 Claims
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1. An iris code generation method, comprising
a processor to perform 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 that selects a bit value of the single iris code based on a majority occurrence of bit values in the iris codes. - View Dependent Claims (2, 3, 6, 7, 10)
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4. An iris code registration device, comprising:
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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 that selects a bit value of the single iris code based on a majority of occurrences of bit values in the iris codes; and an iris code registration section for registering the iris code output from the iris code synthesis section in a database. - View Dependent Claims (8, 11)
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5. An iris authentication device, comprising:
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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 that selects a bit value of the single iris code based on a majority of occurrences of bit values in the iris codes; 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. - View Dependent Claims (9, 12)
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Specification