COMPACT BIOMETRIC AUTHENTICATION DEVICE AND ASSOCIATED METHODOLOGY OF IMAGING AND DETECTING LIVING-TISSUE PATTERNS
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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.
8 Citations
13 Claims
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1. (canceled)
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2. A device, comprising:
circuitry configured to detect a change in absorbance of a source light in blood as beat signals by detecting an interference between incident light and scattered light, and determine whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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detecting a change in absorbance of a source light in blood as beat signals by detecting an interference between incident light and scattered light; and determining whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood.
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13. An apparatus, comprising:
a non-transitory computer-readable storage medium including computer executable instructions, where the instructions, when executed by a processor, cause the processor to detect a change in absorbance of a source light in blood as beat signals by detecting an interference between incident light and scattered light, and determine whether there is an absence of blood flow based on the detected change in the absorbance of the source light in the blood.
Specification