Method, information processing apparatus and server for determining a physiological parameter of an individual
An information processing apparatus is described. This determines a physiological parameter of an individual, the apparatus comprising: image circuitry configured to obtain a series of images of a skin exposed region of the individual; and processing circuitry configured to perform a periodogram on at least one of the red, green and blue channels of the skin exposed region of the series of images to obtain frequency components of the channel; and to determine the physiological parameter based on the periodogram.
1. A method of determining a physiological parameter of an individual, the method comprising the steps of:
obtaining a series of images of a skin exposed region of the individual;
performing a periodogram on at least one of the red, green and blue channels of the skin exposed region of the series of images to obtain frequency components of the channel;
determining the physiological parameter based on the periodogram; and
performing band pass filtering on the periodogram, the band pass filter being configured to pass through frequencies of the pulse of the individual.
2. A method according to claim 1 , further comprising determining the power of each frequency component within the periodogram and determining the physiological parameter as the frequency component having the highest power within the periodogram.
3. A method according to claim 2 , wherein the physiological parameter is the frequency component having the highest power at or below a threshold power.
4. A method according to claim 1 , wherein the band pass filtering includes a plurality of bands and the method further comprises: determining the number of frequency components within each of the bands and determining the physiological parameter based on the number of frequency components within each of the bands.
5. A method according to claim 4 , wherein the physiological parameter is a HRV and the HRV is calculated according to
HRV
=
Number
FirstFreq
Number
SecondFreq
Where Number FirstFreq is the number of frequencies in a first frequency band and Number SecondFreq is the number of frequencies in a second frequency band, the frequency of the second frequency band being higher than the first frequency band.
6. A method according to claim 1 , comprising applying a timestamp to each image in the series of images and providing a constant sample rate of images based on the applied timestamp.
7. A method according to claim 1 comprising converting each of the R, G, B signals into a Hue-Saturation-Value prior to performing the band-pass filtering.
8. An information processing apparatus for determining a physiological parameter of an individual, the apparatus comprising:
image circuitry configured to obtain a series of images of a skin exposed region of the individual;
processing circuitry configured to perform a periodogram on at least one of the red, green and blue channels of the skin exposed region of the series of images to obtain frequency components of the channel and to determine the physiological parameter based on the periodogram; and
band pass filter circuitry configured to perform band pass filtering on the periodogram, the band pass filter circuitry being configured to pass through frequencies of the pulse of the individual.
9. An apparatus according to claim 8 , wherein the processing circuitry is configured to determine the power of each frequency component within the periodogram and determine the physiological parameter as the frequency component having the highest power within the periodogram.
10. An apparatus according to claim 9 , wherein the physiological parameter is the frequency component having the highest power at or below a threshold power.
11. An apparatus according to claim 9 , wherein the band pass filter circuitry includes a plurality of bands and the processing circuitry is further configured to determine the number of frequency components within each of the bands and determining the physiological parameter based on the number of frequency components within each of the bands.
12. An apparatus according to claim 11 , wherein the physiological parameter is a HRV and the HRV is calculated according to
HRV
=
Number
FirstFreq
Number
SecondFreq
Where Number FirstFreq is the number of frequencies in a first frequency band and Number SecondFreq is the number of frequencies in a second frequency band, the frequency of the second frequency band being higher than the first frequency band.
13. An apparatus according to claim 8 , wherein the processing circuitry is configured to apply a timestamp to each image in the series of images and providing a constant sample rate of images based on the applied timestamp.
14. A server comprising communication circuitry and server processing circuitry configured to receive the physiological parameter from an information processing apparatus according to claim 8 and in the event that the physiological parameter exceeds a threshold value, the server processing circuitry is configured to control the communication circuitry to issue an alert over a network.
15. A computer program comprising computer readable instructions which, when loaded onto a computer, configure the computer to perform a method according to claim 1 .