Heart rate and respiratory rate measurements from imagery

A computer system, comprising:

• one or more processors;
• and
• one or more non-transitory computer readable media that collectively store instructions that, when executed by the one or more processors, cause the computing system to perform operations, the operations comprising:
• obtaining a plurality of image frames captured by a camera while a digit of the subject is placed in a field of view of the camera;
• measuring a plurality of photoplethysmography (PPG) waveforms respectively extracted from a plurality of regions of interest defined relative to the plurality of image frames to identify a particular PPG waveform with the greatest signal-to-noise-ratio;
• extracting a dominant frequency from the particular PPG waveform;
• and
• determining, by the computing system, the heart rate of the subject based on the dominant frequency extracted from the PPG waveform.