Compact biometric authentication device and associated methodology of imaging and detecting living-tissue patterns
First Claim
1. A device, comprising:
- circuitry configured todetect a change in absorbance of a source light in blood of a user by detecting a difference in frequency between incident light and scattered light in the blood of the user, the difference in frequency based on an interference pattern between the incident light and the scattered light;
determine whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood;
compare, when the absence of blood flow is not detected, the interference pattern with a reference interference pattern; and
biometrically authenticate the user according to the comparison of the interference pattern with the reference interference pattern.
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Abstract
The apparatus enables biometric authentication without the risk of forgery or the like and enables living-tissue discrimination. The roughness distribution pattern of deep-layer tissue of the skin covered with epidermal tissue is detected, thereby extracting a unique pattern of the living tissue. Biometric authentication is performed based upon the detected pattern. The roughness distribution pattern of the deep-layer tissue of the skin is optically detected using difference in optical properties between the epidermal tissue and the deep-layer tissue of the skin. Long-wavelength light, e.g., near-infrared light, is used as illumination light cast onto the skin tissue. A fork structure of a subcutaneous blood vessel is used as the portion which is to be detected, for example. The portion which is to be detected is determined based upon the structure of the fork structure. The living-tissue discrimination may be made using the subcutaneous blood vessel.
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Citations
20 Claims
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1. A device, comprising:
circuitry configured to detect a change in absorbance of a source light in blood of a user by detecting a difference in frequency between incident light and scattered light in the blood of the user, the difference in frequency based on an interference pattern between the incident light and the scattered light; determine whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood; compare, when the absence of blood flow is not detected, the interference pattern with a reference interference pattern; and biometrically authenticate the user according to the comparison of the interference pattern with the reference interference pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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detecting, by circuitry, a change in absorbance of a source light in blood of a user by detecting a difference in frequency between incident light and scattered light in the blood of the user, the difference in frequency based on an interference pattern between the incident light and the scattered light; determining, by the circuitry, whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood; comparing, by the circuitry when the absence of blood flow is not detected, the interference pattern with a reference interference pattern; and biometrically authenticating the user, by the user, according to the comparison of the interference pattern with the reference interference pattern. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A non-transitory computer-readable storage medium including computer executable instructions that, when executed by a processor, cause the processor to:
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detect a change in absorbance of a source light in blood of a user by detecting a difference in frequency between incident light and scattered light in the blood of the user, the difference in frequency based on an interference pattern between the incident light and the scattered light; determine whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood; compare, when the absence of blood flow is not detected, the interference pattern with a reference interference pattern stored; and biometrically authenticate the user according to the comparison of the interference pattern with the reference interference pattern. - View Dependent Claims (20)
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Specification