Touchless volume waveform sampling to determine respiration rate

A method of non-contact monitoring respiration of a patient, the method comprising:

• obtaining image data from at least one camera sensor having a field of view (FOV);
• determining a region of interest (ROI) of the image data, the ROI comprising a portion of the FOV of the at least one camera sensor;
• determining a visualization mask based on pixels within the image data associated with respiration;
• determining a bounding box for the image data based on the visualization mask;
• determining that a location of the pixels within at least one of the bounding box or the visualization mask have moved more than a set distance in less than a set time period as compared to pixels associated with respiration in previously obtained image data;
• in response to determining that the location of the pixels within at least one of the bounding box or the visualization mask have moved more than a set distance in less than a set time period, setting the bounding box to equal the ROI;
• determining a sampling region for the image data, the sampling region being based on an average including the bounding box and at least one previously determined bounding box;
• determining at least a portion of a volume waveform based at least in part on the sampling region;
• and
• determining at least one respiration parameter based on the volume waveform;
• and
• outputting, for display, the at least one respiration parameter.