Apparatus and method for determining a respiration volume signal from image data

A non-transitory computer readable medium storing instructions executable by at least one electronic processor to perform a method for determining a respiration volume signal from a subject, the method comprising:

• receiving image data detected from a field of view,
• determining a plurality of alternating signals including vital sign information of the subject from different areas of the field of view from the received image data,
• determining at least one characteristic parameter corresponding to a respiration parameter of the subject on the basis of the plurality of alternating signals,
• determining, separately from the at least one characteristic parameter, a calibration value on the basis of a breathing volume measured during at least one of an inhale and exhale of the subject by means of an airflow measurement,
• calculating the respiration volume of the subject on the basis of the calibration value and the characteristic parameter, wherein the plurality of alternating signals are weighted by a weight factor;
• and
• controlling a display device to continuously display the calculated respiration volume of the subject.

An apparatus for determining a respiration volume signal from a human subject, the apparatus comprising:

• a camera arranged remote from the human subject and configured to acquire image data from the field of view;
• a spirometer configured to determine a calibration value on the basis of a breathing volume measured during at least one of an inhale and exhale of the subject;
• and
• at least one electronic processor programmed to:
• receive image data detected from the field of view from the camera;
• determine a plurality of alternating signals including vital sign information of the subject from different areas of the field of view from the image data by operations including:
• determine an energy distribution parameter of the plurality of alternating signals;
• select at least one area in the field of view based on the determined energy distribution parameter,
• determine at least one characteristic parameter corresponding to a respiration parameter of the subject on the basis of the plurality of alternating signals,
• calculate the respiration volume of the subject on the basis of the calibration value and the at least one characteristic parameter wherein the plurality of alternating signals are weighted by a weight factor;
• control a display device to continuously display the calculated respiration volume of the subject;
• wherein the spirometer is further configured to
• measure the breathing volume of the subject during an inhale and an exhale cycle;
• correlate a maximum inhale volume to the corresponding maximum of the characteristic parameter;
• correlate a minimum inhale volume to the corresponding minimum of the characteristic parameter to determine the calibration value;
• and
• scale the characteristic parameter according to the determined calibration value to continuously calculate the respiration volume.