DEVICE AND METHOD FOR EXTRACTING PHYSIOLOGICAL INFORMATION

• US 20150297142A1
• Filed: 07/08/2013
• Published: 10/22/2015
• Est. Priority Date: 07/30/2012
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: De Jaam, Gerard
• Application Number:
  US14/417,800
• Publication Number:
  US 20150297142A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2576/02 specially adapted for a particular organ or body part
• CPC Class Codes: A61B 5/0075 by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy A61B5/0071 takes precedence
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02433 for infrared radiation
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: A61B 5/725 using specific filters therefor, e.g. Kalman or adaptive filters A61B5/316 take precedence
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/7485 Automatic selection of region of interest
• CPC Class Codes: G06F 2218/02 Preprocessing
• CPC Class Codes: G06T 2207/10048 Infrared image
• CPC Class Codes: G06T 2207/30076 Plethysmography
• CPC Class Codes: G06T 7/0016 involving temporal comparison
• CPC Class Codes: G06V 10/141 Control of illumination
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths
• CPC Class Codes: G06V 40/15 Biometric patterns based on physiological signals, e.g. heartbeat, blood flow
• CPC Class Codes: G06V 40/161 Detection; Localisation; Normalisation

Abstract

The present invention relates to a device and method for extracting physiological information from electromagnetic radiation emitted or reflected by a subject (12). A data stream (30) derived from detected electromagnetic radiation is received, the data stream (30) comprising a first sequence (92; 152) of signal samples (94) indicative of various spectral portions. The data stream (30) is split into at least two deduced staggered sequences (96a, 96b, 96c) of registered signal samples (94a, 94b, 94c), wherein each of the deduced staggered sequences (96a, 96b, 96c) represents a defined spectral portion (82a, 82b, 82c) and comprises indicative signal samples (94a, 94b, 94c) spaced in time. Artificial samples (102a, 2b, 102c) are generated under consideration of proximate indicative signal samples (94a, 94b, 94c) so as to at least partially replace blank spaces (98) between the indicative signal 10 samples (94a, 94b, 94c), thereby generating a supplemented data stream (106). Preferably, a spectral composition of the signal samples (94a, 94b, 94c) in the first sequence (92; 152) is alternatingly influenced.

Claims

1. A device for extracting physiological information from electromagnetic radiation emitted or reflected by a subject, comprising:

an interface for receiving a data stream derived from detected electromagnetic radiation, the data stream comprising a first sequence of signal samples indicative of various spectral portions;

a data decomposer configured for splitting the first sequence into at least two deduced staggered sequences of registered signal samples, wherein each of the deduced staggered sequences represents a defined spectral portion and comprises indicative signal samples spaced in time; and

a data processor configured for generating artificial samples under consideration of proximate indicative signal samples so as to at least partially replace blank spaces between the indicative signal samples such that a supplemented data stream is generated.

2. The device as claimed in claim 1, further comprising a signal detector for extracting a continuous or discrete characteristic signal from the supplemented data stream, the characteristic signal including the physiological information indicative of at least one at least partially periodic vital signal.

3. The device as claimed in claim 1, further comprising a sensor configured for capturing electromagnetic radiation, wherein the sensor comprises a defined response characteristic adapted to at least one defined spectral distribution.

4. The device as claimed in claim 1, further comprising at least one source of electromagnetic radiation configured for directing radiation to the subject.

5. The device claimed in claim 1, further comprising a signal scope unit for alternatingly influencing a spectral composition of the signal samples in the first sequence.

6. The device as claimed in claim 5, wherein the signal scope unit comprises a clock-controlled filter configured for selectively switching between at least two defined spectral response characteristics of the sensor.

7. The device as claimed in claim 5, wherein the signal scope unit comprises a clock-controlled filter configured for selectively switching between at least two defined spectral distributions of radiation generated by the at least one source of electromagnetic radiation.

8. The device as claimed in claim 5, comprising at least two illumination sources, each of which configured for generating radiation of a distinct spectral composition, wherein the signal scope unit is further configured for time-sequentially alternatingly driving the at least two illumination sources.

9. The device as claimed in claim 1, wherein the data processor is further configured for generating interpolated artificial samples under consideration of proximate indicative signal samples such that the generated supplemented data stream comprises motion compensated artificial samples.

10. The device as claimed in claim 1, further comprising a skin segmentation unit for detecting a region of interest in the subject, wherein the data processor is further configured for determining temporal displacement of the region of interest for generating the interpolated artificial samples.

11. The device as claimed in claim 1, further comprising a feature tracker for detecting at least one distinct skin portion, wherein a determined displacement of the at least one distinct skin portion is used for generating the interpolated artificial samples.

12. The device as claimed in claim 1, wherein a frame rate of the sensor and a splitting frequency of the data decomposer are synchronized, such that the sensor and the data decomposer are at an operating frequency amounting to twice as high as a mains frequency or to an integer fraction of the mains frequency of a power supply grid.

13. A method for extracting physiological information from electromagnetic radiation emitted or reflected by a subject, comprising:

receiving a data stream derived from detected electromagnetic radiation, the data stream comprising a first sequence of signal samples indicative of various spectral portions;

splitting the first sequence into at least two deduced staggered sequences of registered signal samples, wherein each of the deduced staggered sequences represents a defined spectral portion and comprises indicative signal samples spaced in time; and

generating artificial samples under consideration of proximate indicative signal samples so as to at least partially replace blank spaces between the indicative signal samples such that a supplemented data stream is generated.

14. The method as claimed in claim 13, further comprising

alternatingly influencing a spectral composition of the signal samples in the first sequence.

15. (canceled)

16. A non-transient computer readable medium having instructions, when executed by a processor, for carrying out a method for extracting physiological information from electromagnetic radiation emitted or reflected by a subject, comprising:

receiving a data stream derived from detected electromagnetic radiation, the data stream comprising a first sequence of signal samples indicative of various spectral portions;

splitting the first sequence into at least two deduced staggered sequences of registered signal samples, wherein each of the deduced staggered sequences represents a defined spectral portion and comprises indicative signal samples spaced in time; and

generating artificial samples under consideration of proximate indicative signal samples so as to at least partially replace blank spaces between the indicative signal samples such that a supplemented data stream is generated.