Iris code generation method, individual authentication method, iris code entry device, individual authentication device, and individual certification program
First Claim
Patent Images
1. An iris code generation method comprising the steps of:
- a step of capturing a plurality of iris images that include a same eye;
a step of transforming a coordinate system of each of the iris images from a rectangular coordinate system to a polar coordinate system;
a step of performing rotational compensation on each of the coordinate transformed iris images;
a step of adding together each of the rotationally compensated iris images, while attaching a weight to each pixel value in each coordinate of the polar coordinate system, to accumulate them as a single iris image; and
a step of generating an iris code from the single iris image, wherein in the weighted addition in the accumulation step, the weight is set smaller as a distance between a coordinate value in the original rectangular coordinate system corresponding to a coordinate of the polar coordinate system and a coordinate value of a pixel in the vicinity thereof is larger.
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Abstract
A plurality of images that include the same eye is input (S11) and iris regions are extracted therefrom to obtain iris images (S12). After the plural iris images are subjected to transformation from a rectangular coordinate system to a polar coordinate system (S13) and rotational compensation (S14), the images are added together while a weight is attached to a pixel value in each coordinate of the polar coordinate system, to accumulate them as a single iris image (S15). An iris code is generated from the thus obtained single iris image (S16, S17).
48 Citations
9 Claims
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1. An iris code generation method comprising the steps of:
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a step of capturing a plurality of iris images that include a same eye;
a step of transforming a coordinate system of each of the iris images from a rectangular coordinate system to a polar coordinate system;
a step of performing rotational compensation on each of the coordinate transformed iris images;
a step of adding together each of the rotationally compensated iris images, while attaching a weight to each pixel value in each coordinate of the polar coordinate system, to accumulate them as a single iris image; and
a step of generating an iris code from the single iris image, wherein in the weighted addition in the accumulation step, the weight is set smaller as a distance between a coordinate value in the original rectangular coordinate system corresponding to a coordinate of the polar coordinate system and a coordinate value of a pixel in the vicinity thereof is larger. - View Dependent Claims (5, 6, 7, 8, 9)
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2. An iris code generation method comprising the steps of:
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a step of capturing a plurality of iris images that include a same eye;
a step of transforming a coordinate system of each of the iris images from a rectangular coordinate system to a polar coordinate system;
a step of performing band limitation on each of the coordinate transformed iris images;
a step of performing rotational compensation on the band-limited iris images;
a step of adding together each of the rotationally compensated iris images, while attaching a weight to a data value in each coordinate of the polar coordinate system, to accumulate them as a single iris image; and
a step of generating an iris code from the single iris image, wherein in the weighted addition in the accumulation step, the weight of a data value of which coordinate value of the original rectangular coordinate system corresponding to a coordinate of the polar coordinate system is close to an integer is set large, while the weight of a data value thereof is far from an integer is set small. - View Dependent Claims (4)
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3. An iris code generation method comprising the steps of:
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a step of capturing a plurality of iris images that include a same eye;
a step of transforming a coordinate system of each of the iris images from a rectangular coordinate system to a polar coordinate system;
a step of performing band limitation on each of the coordinate transformed iris images;
a step of performing rotational compensation on the band-limited iris images;
a step of adding together each of the rotationally compensated iris images, while attaching a weight to each data value in each coordinate of the polar coordinate system, to accumulate them as a single iris image; and
a step of generating an iris code from the single iris image, wherein in the weighted addition in the accumulation step, the weight is set smaller as a distance between a coordinate value of the original rectangular coordinate system corresponding to a coordinate of the polar coordinate system and a coordinate value of a pixel in the vicinity thereof is larger.
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Specification