Method of detecting biological pattern, biological pattern detector, method of biological certificate and biological certificate apparatus
First Claim
1. A living-tissue pattern detecting method wherein the roughness distribution pattern of deep-layer tissue of skin covered with epidermal tissue is detected for extracting a unique pattern of living tissue.
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Abstract
The present invention enables permanent biometric authentication without the risk of forgery or the like. The present invention enables living-tissue discrimination as well as biometric authentication. 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. Then, 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. In this case, 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. In this case, the living-tissue discrimination may be made using the subcutaneous blood vessel.
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Citations
58 Claims
- 1. A living-tissue pattern detecting method wherein the roughness distribution pattern of deep-layer tissue of skin covered with epidermal tissue is detected for extracting a unique pattern of living tissue.
- 17. A living-tissue pattern detecting device including means for detecting the roughness distribution pattern of deep-layer tissue of skin covered with epidermal tissue.
- 32. A biometric authentication method wherein the roughness distribution pattern of deep-layer tissue of the skin covered with epidermal tissue is detected, and said roughness distribution pattern thus detected is compared to a pattern which has been registered beforehand, whereby biometric authentication is performed.
- 45. A biometric authentication device including means for detecting the roughness distribution pattern of deep-layer tissue of the skin covered with epidermal tissue, wherein said roughness distribution pattern thus detected is compared to a pattern which has been registered beforehand, whereby biometric authentication is performed.
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57. A biometric authentication method wherein near-infrared light is cast onto the tissue through a polarizing filter, as well as detecting reflected light through a polarizing filter with a polarizing plane orthogonal to that of said polarizing filter, so as to detect an image of blood capillaries beneath epidermis or the three-dimensional distribution pattern thereof, and wherein comparison is made between:
- said image of blood capillaries beneath epidermis or said three-dimensional distribution pattern thereof thus detected; and
a pattern registered beforehand, whereby biometric authentication is performed.
- said image of blood capillaries beneath epidermis or said three-dimensional distribution pattern thereof thus detected; and
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58. A biometric authentication device comprising:
- an illumination optical system including a light source for casting near-infrared light onto a portion which is to be detected, and a polarizing filter for aligning the polarizing plane of illumination light cast from said light source; and
an imaging optical system including an imaging unit for taking an image of reflected light from said portion which is to be detected, and a polarizing filter with the polarizing plane orthogonal to that of said polarizing filter;
wherein comparison is made between;
an acquired image of blood capillaries beneath epidermis or the three-dimensional distribution pattern thereof; and
a pattern registered beforehand, whereby biometric authentication is performed.
- an illumination optical system including a light source for casting near-infrared light onto a portion which is to be detected, and a polarizing filter for aligning the polarizing plane of illumination light cast from said light source; and
Specification