Device and method for extracting information from characteristic signals

Patent metadata

Field	Value
Publication number	US-9224202-B2
Application number	US-201214110440-A
Country	US
Kind code	B2
Filing date	Mar 27, 2012
Priority date	Apr 14, 2011
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

A device and a method for extracting information from detected characteristic signals are provided. A data stream ( 26 ) derivable from electromagnetic radiation ( 20 ) emitted or reflected by an object ( 10 ) is received. The data stream ( 26 ) includes a continuous or discrete characteristic signal ( 68 ) including physiological information ( 30 ) indicative of desired object motion to be detected and utilized so as to extract at least one at least partially periodic vital signal of interest. A plurality of characteristic index elements ( 60 ) can be derived from the data stream ( 26 ) through a dimensional reduction ( 66 ). The plurality of characteristic index elements ( 60 ) includes a directional motion component ( 70 ) associated with a disturbance-reduced index element ( 40 ) having a determined orientation substantially aligned with a reference motion direction ( 41 ) indicative of the desired object motion. Consequently, dimensional reduced data can be utilized for detecting the vital signal of interest.

First claim

The invention claimed is:

1. A device for extracting information from detected characteristic signals, comprising:
an interface for receiving a data stream comprising a sequence of image frames derivable from electromagnetic radiation emitted or reflected by an object, the data stream comprising a continuous or discrete characteristic signal including physiological information indicative of desired object motion, the physiological information being representative of at least one at least partially periodic vital signal, and
an extractor means for extracting the physiological information from the data stream by:
determining a disturbance-reduced element having a predetermined orientation substantially aligned with a reference motion direction, by extracting a motion indicative component from each of a subset of the image frames,
determining a characteristic index element from each motion indicative component in accordance with the alignment of the motion indicative component associated with the disturbance-reduced element, and
combining the characteristic index elements to form a derivative signal for generating a set of physiological information indicative of the at least one at least partially periodic vital signal.

2. The device as claimed in claim 1 , wherein the derivative signal form is further indicative of a remaining disturbing signal component, the device further comprising a converter means for converting the derivative signal form by enhancing a desired object motion component of the derivative signal form indicating the vital signal and by suppressing a remaining disturbing signal component.

3. The device as claimed in claim 1 , further comprising an analyzing means for determining temporal variation of the derivative signal form or the desired object motion component corresponding to the at least one at least partially periodic vital signal.

4. The device as claimed in claim 1 , wherein each characteristic index element is derived from a respective image frame.

5. The device as claimed in claim 1 , wherein the extraction of the physiological information from the data stream further comprises processing the captured data stream sequence by determining a portion of interest highly-indicative of desired object motion.

6. The device as claimed in claim 1 further comprising a sensor means for detecting an electromagnetic radiation within at least one particular wavelength range selected from the group consisting of visible light, infrared light, and ultraviolet radiation, the sensor means being connectable to the interface.

7. The device as claimed in claim 1 , wherein the extractor means is further configured for agglomerating and projecting data stream properties associated with respective sub entities of the image frame comprised in the data stream to the disturbance-reduced element, thereby obtaining the respective characteristic index element.

8. The device of claim 1 , wherein the extractor means is further adapted to determine the predetermined orientation of the disturbance-reduced element taking into account the reference motion direction.

9. The device as claimed in claim 2 , wherein the conversion of the derivative signal form further comprises processing the derivative signal form or the desired object motion component embedded therein, and wherein the processing is selected from the group consisting of motion compensation, filtering, windowing, clipping, edge emphasizing, and edge de-emphasizing.

10. The device as claimed in claim 7 , wherein the extractor means is further adapted to apply an integral transformation to at least one respective characteristic index element, thereby obtaining spectral information.

11. The device as claimed in claim 10 , wherein the extractor means is adapted to apply a Fourier transformation to respective characteristic index elements so that a sequence of magnitude ranges can be obtained.

12. The device of claim 6 , wherein the extractor means is further adapted for compensation for disturbing motion with respect to object motion non-indicative of the desired vital signal or to overall relative motion between the object and the sensor means.

13. A device for extracting information from detected characteristic signals, comprising:
an interface configured to receive a data stream comprising a sequence of image frames derivable from electromagnetic radiation emitted or reflected by an object, the data stream comprising a continuous or discrete characteristic signal including physiological information indicative of desired object motion, the physiological information being at least one at least partially periodic vital signal,
one or more computer processors configured to:
derive the physiological information from the data stream by determining a disturbance-reduced element, the disturbance-reduced element having a predetermined orientation substantially aligned with a reference motion direction by extracting a motion indicative component from each of at least a subset of the image frames;
determine a characteristic index element from each motion indicative component,
determine a temporal variation of the motion indicative component based on at least a relative offset between a current characteristic index element and a preceding or subsequent characteristic index element, and
form a derivative signal for generating a set of physiological information indicative of the at least one at least partially periodic signal.

14. A method for extracting information from detected characteristic signals, comprising the steps:
with one or more processors, receiving a data stream comprising a sequence of image frames derivable from electromagnetic radiation emitted or reflected by an object, the data stream comprising a continuous or discrete characteristic signal including physiological information indicative of desired object motion, the physiological information being representative of at least one at least partially periodic vital signal, and
with the one or more processors, extracting the physiological information from the data stream by deriving a plurality of characteristic index elements from the data stream through a dimensional reduction, the plurality of characteristic index elements comprising a directional motion component associated with a disturbance-reduced element, the disturbance-reduced element having a predetermined orientation substantially aligned with a reference motion direction, the plurality of characteristic index elements being indicative of a derivative signal form comprising the physiological information; and
with the one or more processors, combining the characteristic index elements to form a derivative signal for generating a set of physiological information indicative of the at least one at least partially periodic signal.

15. A computer program comprising program code means stored on a non-transitory computer-readable medium for causing a computer to carry out the steps of the method as claimed in claim 14 when said computer program is carried out on the computer.

16. A device for extracting information from detected characteristic signals, comprising:
an interface configured to receive a sequence of image frames derivable from electromagnetic radiation emitted or reflected by an object, the sequence of image frames including a characteristic signal including physiological information indicative of desired object motion, the physiological information being representative of at least one at least partially periodic vital signal, and
one or more processors programmed to: extract the physiological information from the sequence

Assignees

• De Haan Gerard
• Bartula Marek Janusz
• Koninkl Philips Nv

Inventors

• De Haan Gerard
• Bartula Marek Janusz

Classifications

• G06T7/0016 Primary

  involving temporal comparison · CPC title

• G06T7/0012 Primary

  Biomedical image inspection · CPC title

• G06T2207/20068

  Projection on vertical or horizontal image axis · CPC title

• G06T2207/30076

  Plethysmography · CPC title