Biometric identification apparatus and method using bio signals and artificial neural network
First Claim
1. A biometric identification apparatus comprising:
- a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal;
a template calculation unit which calculates a template value using the periodic signals which are extracted, the template value comprising a connection strength between neurons of an artificial neural network corresponding to the bio signal;
a template storage unit which stores a plurality of template values which correspond to a plurality of living bodies; and
a reading unit which reads the template value that is most approximate to the template value which is calculated by the template calculation unit from the template storage unit.
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Abstract
A biometric identification apparatus and method using bio signals and an artificial neural network, are provided. The biometric identification apparatus includes: a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal; a template calculation unit which calculates a template value using the extracted periodic signals; a template storage unit which stores a plurality of template values corresponding to a plurality of living bodies; and a reading unit which reads the template value that is most approximate to the template value calculated by the template calculation unit from the template storage unit. Accordingly, it is possible to identify a living body by taking into consideration all of the characteristics of bio signals detected from the living body.
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Citations
26 Claims
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1. A biometric identification apparatus comprising:
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a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal; a template calculation unit which calculates a template value using the periodic signals which are extracted, the template value comprising a connection strength between neurons of an artificial neural network corresponding to the bio signal; a template storage unit which stores a plurality of template values which correspond to a plurality of living bodies; and a reading unit which reads the template value that is most approximate to the template value which is calculated by the template calculation unit from the template storage unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A biometric identification apparatus comprising:
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a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal; a template calculation unit which calculates a template value using the periodic signals which are extracted; a template storage unit which stores a plurality of template values which correspond to a plurality of living bodies; and a reading unit which reads the template value that is most approximate to the template value which is calculated by the template calculation unit from the template storage unit, wherein the periodic signal extraction unit generates temporally normalized signals by computing a Fourier series of each of the periodic signals which are extracted and then computing an inverse Fourier series of the Fourier series of each of the periodic signals which are extracted. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A biometric identification apparatus comprising:
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a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal; a template calculation unit which calculates a template value using the periodic signals which are extracted; a template storage unit which stores a plurality of template values which correspond to a plurality of living bodies; a reading unit which reads the template value that is most approximate to the template value which is calculated by the template calculation unit from the template storage unit; an examination unit which determines whether a living body corresponding to the template value which is read out from the template storage unit is identical to a living body to be authenticated; and an updating unit which updates the stored template value in response to the determination results which are generated by the examination unit, wherein the updating unit updates the stored template value using the following equations;
Winew=a ·
Wiold+b·
Wk,j
i,jnew(t)=c·
i,jold(t)+d·
k,j(t)where Wnew and new are an updated template value and an updated template vector, respectively, Wold and old are a template value yet to be updated and a template vector yet to be updated, respectively, a+b =1, and c+d=1. - View Dependent Claims (15)
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16. A biometric identification apparatus comprising:
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a periodic signal extraction unit which extracts one or more periodic signals from an input bio signal; a template calculation unit which calculates a template value using the periodic signals which are extracted; a template storage unit which stores a plurality of template values which correspond to a plurality of living bodies; and a reading unit which reads the template value that is most approximate to the template value which s calculated by the template calculation unit from the template storage unit; an examination unit which determines whether a living body corresponding to the template value read out from the template storage unit is identical to a living body to be authenticated; and an authentication unit which authenticates the input bio signal which is detected from the living body to be authenticated in response to the determination results which are generated by the examination unit, wherein the periodic signal extraction unit generates magnitude-normalized signals by normalizing the magnitude of the periodic signals which are extracted, and the template calculation unit calculates the template value using the magnitude-normalized signals, and wherein the template values stored in the template storage unit are calculated using the following equations;
Wi=(α
i·
i,jT(t))·
(α
i·
i,j(t))
i,j(t)=[Xi,j(1),Xi,j(2),Xi,j(3), . . . ,Xi,j(N2)]
Xi,j(t)=IFS(F(fi,j(t)))where
i,j(t) is a template vector, i,jmax is a greatest element among a plurality of elements of the template vector, Wi is a template value of an i-th living body stored in the template storage unit, i is an integer between 1 and p (where p is a positive integer greater than
1), j indicates the extracted period signal and is an integer between 1 and m (where m is a positive integer value greater than
1), F indicates a Fourier series function, IFS indicates an inverse Fourier series function, X is a temporally normalized signal, N2 indicates a total number of samples included in the digital signal into which the temporally normalized signal X is converted, and T is a transpose.- View Dependent Claims (17, 18)
(where A is a predetermined constant and B is a maximum magnitude of the input bio signal), and j1 and j2 are values to which j can be set and are determined in advance.
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18. The biometric identification apparatus of claim 17, wherein the reading unit reads the template value corresponding to k from the template storage unit that minimizes a magnitude of a vector (ek) calculated using the following equation:
ek=(α
k·
k,j1(t))·
(Wi−
Wk,j2).
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19. A biometric identification method comprising:
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by a sensor, sensing a bio signal of a living body; using a processor (or computer) to perform the steps of; extracting one or more periodic signals from the bio signal; calculating a template value using the extracted periodic signals, the template comprising a connection strength between neurons of an artificial neural network corresponding to the bio signal; and reading a template value that is most approximate to the template value which is calculated from among a plurality of prepared template values which correspond to a plurality of living bodies and identifying a living body which corresponds to the template value which is read as a living body which corresponds to the bio signal. - View Dependent Claims (20, 21, 22)
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23. A biometric identification method comprising:
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by a sensor, sensing a bio signal of a living body; using a processor (or computer) to perform the steps of; extracting one or more periodic signals from a the bio signal; calculating a template value using the extracted periodic signals; and reading a template value that is most approximate to the template value which is calculated from among a plurality of prepared template values which correspond to a plurality of living bodies and identifying a living body which corresponds to the template value which is read as a living body which corresponds to the bio signal, wherein the extracting of the periodic signals comprises generating temporally normalized signals by computing a Fourier series of each of the periodic signals and then computing an inverse Fourier series of the Fourier series of each of the periodic signals. - View Dependent Claims (24, 25)
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26. A computer-readable recording medium storing a computer program for executing a biometric identification method, the biometric identification method comprising:
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extracting one or more periodic signals from a given bio signal; calculating a template value using the extracted periodic signals, the template value comprising a connection strength between neurons of an artificial neural network corresponding to the bio signal; and reading a template value that is most approximate to the template value which is calculated from among a plurality of prepared template values which corresponds to a plurality of living bodies and identifying a living body which corresponds to the template value which is read as a living body which corresponds to the given bio signal.
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Specification