Method and apparatus for determining information concerning the identity of an individual

• US 9,047,510 B2
• Filed: 03/07/2008
• Issued: 06/02/2015
• Est. Priority Date: 03/08/2007
• Status: Expired due to Fees

• Current Assignee: Intelesens Limited (UltraLinq Healthcare Solutions, Inc.)
• Original Assignee: Intelesens Limited (UltraLinq Healthcare Solutions, Inc.)
• Inventors: McLaughlin, James Andrew, Anderson, John McCune, Kearney, Kenneth Anthony
• Primary Examiner(s): Heller, Tammie K
• Application Number:
  US12/530,131
• Publication Number:
  US 20100145202A1
• Time in Patent Office: 2,643 Days
• Field of Search: 600/509, 600/516, 600/521, 382/115
• US Class Current: 1/1
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06F 2218/10 by analysing the shape of a waveform, e.g. extracting parameters relating to peaks

Abstract

A method of determining information concerning the identity of an individual comprising measuring at least one biometric of the individual comprising at least one bio-potential waveform generated by the individual'"'"'s heart, extracting a plurality of characteristics from the bio-potential waveform comprising any of an approximate location of a point of a P peak, an approximate location of a Q-point of a QRS peak system, an approximate location of an R-point of a QRS peak system, an approximate location of an S-point of a QRS peak system, an approximate location of a point of a T peak, using the characteristics to calculate at least one waveform parameter, comparing at least one calculated waveform parameter with at least one previously-acquired waveform parameter to generate a score, and using the score to determine information concerning the identity of the individual.

Claims

1. A method of determining information concerning the identity of an individual, the method comprising:

measuring at least one biometric of the individual comprising at least one bio-potential waveform generated by the individual'"'"'s heart,

extracting a plurality of characteristics from the bio-potential waveform comprising two or more of an approximate location of a point of a P peak, an approximate location of a Q-point of a QRS peak system, an approximate location of an R-point of a QRS peak system, an approximate location of an S-point of a QRS peak system, or an approximate location of a point of a T peak,

using the plurality of characteristics from the bio-potential waveform to calculate at least one waveform parameter comprising one or more of (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate midpoint of a T peak minus an amplitude at an R-point), (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), or (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an S-point minus an amplitude at an R-point),

comparing at least one calculated waveform parameter with at least one previously acquired waveform parameter to generate a score, and using the score to determine information concerning the identity of the individual.

2. A method according to claim 1 in which the characteristics of the bio-potential waveform further comprise any of an approximate location of a mid-point of a P peak, an approximate location of a start-point of a P peak, an approximate location of an end-point of a P peak, an approximate location of a mid-point of a T peak, an approximate location of a start-point of a T peak, an approximate location of a start-point of a T peak, an interval between characteristics, an area of a peak, a full width at half maximum (FWHM) of a peak, a slope of a peak, a rise-time of a peak, a fall-time of a peak, a reflection of a peak, a DC off-set of the waveform, a drift of the waveform, a signal to noise ratio of the waveform, or an artefact of the waveform.

3. A method according to claim 1 in which the at least one calculated waveform parameter is compared with a plurality of previously-acquired waveform parameters of the individual to generate the score.

4. A method according to claim 1 in which the at least one calculated waveform parameter of the individual is compared with a plurality of previously-acquired waveform parameters of each of a plurality of individuals to generate the score to determine information concerning the identity of the individual comprising either information that the individual is one of the plurality of individuals or information that the individual is not one of the plurality of individuals.

5. A method according to claim 1 in which using the score comprises comparing the score with a pre-set score threshold to determine information concerning the individual.

6. A method according to claim 1 in which a plurality of waveform parameters are calculated, and using the score comprises summing the scores for the waveform parameters, and comparing the aggregate score with a pre-set score threshold to determine information concerning the individual.

7. A method according to claim 1 in which a plurality of waveform parameters are calculated, and the method comprises comparing a first calculated waveform parameter with at least one corresponding previously-acquired waveform parameter to generate a first score and using the first score to determine information concerning the identity of the individual, and if the determined information matches required information concerning the identity of the individual, terminating the method, or if the determined information does not match required information concerning the identity of the individual, comparing a second calculated waveform parameter with at least one corresponding previously-acquired waveform parameter to generate a second score and using the second score to determine information concerning the individual, or using the first and second scores to determine information concerning the individual, and continuing until either the determined information matches required information or each of the waveform parameters has been used.

8. A method according to claim 1 in which the at least one previously-acquired waveform parameter has been obtained from a previously-acquired heart bio-potential biometric of a register individual, and the method determines that the individual is the register individual or is not the register individual.

9. A method according to claim 1 in which at least one previously-acquired waveform parameter has been obtained from each of a plurality of previously-acquired heart bio-potential biometrics of a plurality of register individuals, and the method determines that the individual is one of the register individuals or is not one of the register individuals.

10. A method according to claim 1 in which for at least one waveform parameter, the method comprises calculating a plurality of values of the waveform parameter, determining a median of the plurality of values of the waveform parameter, and comparing the median of the at least one waveform parameter with at least one corresponding previously-acquired waveform parameter to generate the score.

11. A method according to claim 1 in which for each waveform parameter, the method comprises calculating a plurality of values of the waveform parameter, determining a median of the plurality of values of the waveform parameter, and comparing the median with a plurality of corresponding previously-acquired waveform parameters to determine the score, by calculating a difference between the median of the waveform parameter and a mean of the plurality of corresponding previously-acquired waveform parameters and dividing the difference by a standard deviation of the plurality of corresponding previously-acquired waveform parameters.

12. A method according to claim 1, wherein using the plurality of characteristics to calculate at least one waveform parameter comprises using the plurality of characteristics to calculate at least two waveform parameters comprising two or more of an approximate location of an R-point minus an approximate location of a mid-point of a P peak, an approximate location of a mid-point of a T peak minus an approximate location of an R-point, (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate midpoint of a T peak minus an amplitude at an R-point), (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), or (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an S-point minus an amplitude at an R-point).

13. A method according to claim 1, further comprising using the plurality of characteristics from the bio-potential waveform to calculate at least one other waveform parameter comprising at least one of:

an approximate location of an S-point minus an approximate location of an R-point, an approximate location of an R-point minus an approximate location of a Q-point, an approximate location of an R-point minus an approximate location of a mid-point of a P peak, and an approximate location of a mid-point of a T peak minus an approximate location of an R-point.

14. An identification apparatus for determining information concerning the identity of an individual, the identification apparatus comprising:

a measurement device which measures at least one biometric of the individual comprising at least one bio-potential waveform generated by the individual'"'"'s heart, and

an analysis system comprising an analysis device which analyzes the bio-potential waveform to extract a plurality of characteristics from the bio-potential waveform comprising two or more of am approximate location of a point of a P peak, an approximate location of a Q-point of a QRS peak system, an approximate location of an R-point of a QRS peak system, an approximate location of an S-point of a QRS peak system, or an approximate location of a point of a T peak,

a calculation device which uses the plurality of characteristics from the bio-potential waveform to calculate at least one waveform parameter comprising one or more of (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a T peak minus an amplitude at an R-point), (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), or (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an S-point minus an amplitude at an R-point),

a comparator which compares at least one calculated waveform parameter with at least one previously-acquired waveform parameter to generate a score, and uses the score to determine information concerning the identity of the individual.

15. The identification apparatus of claim 14 in which the measurement device comprises two electrodes, a first electrode adapted to be placed in contact with a first portion of the individual, and a second electrode adapted to be placed in contact with a second portion of the individual.

16. A ECG acquisition/analysis device comprising an identification apparatus according to claim 14.

17. A tracking device comprising an identification apparatus according to claim 14.

18. An identification apparatus according to claim 14, wherein the calculation device uses the plurality of characteristics to calculate at least two waveform parameters comprising two or more of an approximate location of an R-point minus an approximate location of a mid-point of a P peak, an approximate location of a mid-point of a T peak minus an approximate location of an R-point, (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate midpoint of a T peak minus an amplitude at an R-point), (an amplitude at an S-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an approximate mid-point of a P peak minus an amplitude at an R-point), or (an amplitude at a Q-point minus an amplitude at an R-point) divided by (an amplitude at an S-point minus an amplitude at an R-point).

19. An identification apparatus according to claim 14, wherein the calculation device uses the plurality of characteristics from the bio-potential waveform to calculate at least one other waveform parameter comprising at least one of:

an approximate location of an S-point minus an approximate location of an R-point, an approximate location of an R-point minus an approximate location of a Q-point, an approximate location of an R-point minus an approximate location of a mid-point of a P peak, and an approximate location of a mid-point of a T peak minus an approximate location of an R-point.