Systems and methods for computer monitoring of remote photoplethysmography based on chromaticity in a converted color space

A method for remote photoplethysmography (rPPG) monitoring by a computer system, the method comprising:

• electronically receiving, at the computer system, a first image data set from an optical imaging element, the first image data set being representative of a series of consecutive images of at least a portion of a living body;
• converting, by the computer system, the first image data set from a first color space to a second color space to generate a second image data set including a* channel data comprising a chromatic component corresponding to a chromaticity value defined between a green chromatic value and a red chromatic value, wherein the second color space is a perceptually uniform color space such that the chromatic component of the a* channel data is independent of an illumination of the series of consecutive images;
• processing, by the computer system, the a* channel data to monitor at least one physiological parameter of the living body;
• automatically determining, by the computer system, a region of interest (ROI) of the living body in the first image data set, and tracking, by the computer system, the ROI through at least some consecutive images of the series of consecutive images;
• and
• removing, by the computer system, one or more consecutive images of the series of consecutive images if a number of identified feature points in the ROI in the one or more consecutive images is below a predetermined threshold.

A non-transitory computer readable medium comprising program instructions for execution by a processor of a computer system to cause the computer system to perform the following steps:

• electronically receive, at the computer system, a first image data set from an optical imaging element, the first image data set being representative of a series of consecutive images of at least a portion of a living body;
• convert, by the computer system, the first image data set from a first color space to a second color space to generate a second image data set including a* channel data comprising a chromatic component corresponding to a chromaticity value defined between a green chromatic value and a red chromatic value, wherein the second color space is a perceptually uniform color space such that the chromatic component of the a* channel data is independent of an illumination of the series of consecutive images;
• process, by the computer system, the a* channel data to monitor at least one physiological parameter of the living body;
• automatically determine, by the computer system, a region of interest (ROI) of the living body in the first image data set and tracking, by the computer system, the ROI through at least some consecutive images of the series of consecutive images;
• initialize, by the computer system, the ROI based on a first image of the series of consecutive images;
• and
• reinitialize, by the computer system, the ROI after a predetermined number of images of the series of consecutive images.