Biometric authentication apparatus, biometric authentication method and recording medium
AssigneeNEC Corporation
InventorsLeiming Su, Yukio Hoshino, Yukio Itakura
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Abstract
A plurality of pieces of information related to the iris pattern of an eye can be checked against each other in a short time. Characteristic curves (S(1)-S(8)), which are in accordance with eight ring areas (A1-A8) formed by dividing an image of an iris, are generated. The polarities of the gradients of these characteristic curves are then arranged, thereby generating codes (1-8) to be checked. Each of these codes (1-8) to be checked consists of a ternary combination of +, − and zero, whereby the amount of data to be handled during the checking process can be reduced. As a result, checking the codes to be checked can be performed in a short time.
Claims5
A biometric authentication apparatus, comprising:
- a curve calculating unit which is implemented in a processor and which is configured for calculating, based on a digital image of an iris, curves showing a relationship between polar coordinates indicating a position of the iris on the digital image and luminance of pixels of the digital image of the iris corresponding to coordinate values of the polar coordinates;
- and a code generating unit which is implemented in a processor and which is configured for generating a comparison target code by arranging three values based on polarities of slopes of the curves in order of the polar coordinates, wherein the three values include +, −, and 0.
A biometric authentication method, comprising:
- a process for calculating, based on a digital image of an iris, curves showing a relationship between polar coordinates indicating a position of the iris on the digital image and luminances of pixels comprising of digital image of the iris corresponding to coordinate values of the polar coordinates;
- and a process for generating a comparison target code by arranging three values based on polarities of slopes of the curves in order of the polar coordinates, wherein the three values include +, −, and 0.
A non-transitory computer-readable recording medium on which is recorded a program that causes a computer to function as:
- a means for calculating, based on a digital image of an iris, curves showing a relationship between polar coordinates indicating a position of the iris on the digital image and luminances of pixels of the digital image of the iris corresponding to coordinate values of the polar coordinates;
- and
- a means for generating a comparison target code by arranging three values based on polarities of slopes of the curves in order of the polar coordinates, wherein the three values include +, −, and 0.
Dependencies are inferred from the claim text.