Application US20200297270

BIOMETRIC APPARATUS, BIOMETRIC METHOD, AND DETERMINATION APPARATUS
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US20200297270

1. A biometric apparatus comprising: (9) (3)

a first detector that detects and outputs a brain activity signal indicating a state of brain activity in a target person; and

a signal processing circuit, wherein

the signal processing circuit acquires the brain activity signal,

acquires a biological signal of the target person that is different from the brain activity signal,

determines, based on the biological signal and the brain activity signal, whether a state of the target person is an awake state, a sleeping state, or an unconscious state, and

generates and outputs a signal indicating the state of the target person.

2. The biometric apparatus according to claim 1, wherein (0) (1)

3. The biometric apparatus according to claim 1, further comprising: (0) (1)

4. The biometric apparatus according to claim 1, further comprising: (3) (4)

a light source that emits a light pulse irradiating a head of the target person; and

a control circuit, wherein

the first detector detects at least a part of a reflected light pulse returning from the head, and

the control circuit causes the light source to emit the light pulse, and

causes the first detector to detect and output an internal scattering component scattered inside a brain of the target person from the reflected light pulse as the brain activity signal.

10. The biometric apparatus according to claim 4, wherein (2) (3)

the control circuit causes the first detector to

further detect a surface reflection component reflected at a surface of a skin of the target person from the reflected light pulse, and

output a signal indicating a variation in the surface reflection component as the biological signal.

11. The biometric apparatus according to claim 10, wherein (0) (3)

12. The biometric apparatus according to claim 10, wherein (0) (2)

13. The biometric apparatus according to claim 4, wherein (0) (1)

32. The biometric apparatus according to claim 4, wherein (0) (1)

5. The biometric apparatus according to claim 1, wherein (0) (1)

6. The biometric apparatus according to claim 1, wherein (0) (1)

7. The biometric apparatus according to claim 1, wherein (0) (1)

8. The biometric apparatus according to claim 1, wherein (0) (1)

9. The biometric apparatus according to claim 1, wherein (0) (1)

14. The biometric apparatus according to claim 1, wherein (1) (3)

the signal processing circuit

makes a first determination related to the state of the target person based on the biological signal, and outputs a first signal indicating a result of the first determination, and

after outputting the first signal, makes a second determination related to the state of the target person based on the brain activity signal, and outputs a second signal indicating a result of the second determination.

15. The biometric apparatus according to claim 14, further comprising: (0) (2)

16. A biometric method comprising: (6) (3)

acquiring a brain activity signal of a target person;

acquiring a biological signal of the target person that is different from the brain activity signal; and

determining, based on the biological signal and the brain activity signal, whether a state of the target person is an awake state, a sleeping state, or an unconscious state.

17. The biometric method according to claim 16, wherein (5) (2)

the acquiring the brain activity signal includes irradiating a head of the target person with a light pulse using a light source in a biometric apparatus that includes the light source, a photodetector, a signal processing circuit, and a control circuit, and

using the photodetector to detect and output an internal scattering component scattered inside a brain of the target person from a reflected light pulse returning from the head as the brain activity signal, and

the determining is performed using the signal processing circuit.

18. The biometric method according to claim 17, wherein (0) (1)

24. The biometric method according to claim 17, wherein (0) (2)

25. The biometric method according to claim 17, wherein (0) (2)

26. The biometric method according to claim 17, further comprising: (0) (3)

27. The biometric method according to claim 17, further comprising: (0) (4)

acquiring two-dimensional image data corresponding to the biological signal and the brain activity signal; and

extracting a feature value contained in the two-dimensional image data, wherein

the biometric apparatus further includes memory that stores a reference feature value corresponding to the feature value, and

the determining includes at least one selected from the group consisting of comparing the feature value to the reference feature value, computing a statistical value of the feature value, and executing machine learning of a correlation between the feature value and the state of the target person.

19. The biometric method according to claim 16, wherein (0) (1)

20. The biometric method according to claim 16, wherein (0) (1)

21. The biometric method according to claim 16, wherein (0) (1)

22. The biometric method according to claim 16, wherein (0) (1)

23. The biometric method according to claim 16, wherein (0) (1)

28. A determination apparatus comprising: (0) (2)

29. A biometric apparatus comprising: (2) (6)

a light source that emits a light pulse irradiating a head of a target person;

a photodetector that detects at least a part of a reflected light pulse returning from the head;

a control circuit that controls the light source and the photodetector; and

a signal processing circuit, wherein

the control circuit causes the light source to emit the light pulse,

causes the photodetector to detect and output an internal scattering component scattered inside a brain of the target person from the reflected light pulse as a brain activity signal, and

causes the photodetector to detect and output a surface reflection component reflected at a surface of a skin of the target person from the reflected light pulse as a biological signal different from the brain activity signal, and

the signal processing circuit generates and outputs a signal indicating a state of the target person based on the biological signal and the brain activity signal.

30. The biometric apparatus according to claim 29, wherein (0) (3)

31. The biometric apparatus according to claim 29, wherein (0) (1)

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Application US20200297270

BIOMETRIC APPARATUS, BIOMETRIC METHOD, AND DETERMINATION APPARATUS

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