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Left: Frame (). ROI detection and tracking. The green colored box represents a detected face, while, the three blue (outlined) boxes represent the ROIs (with the shading to represent all pixels within the ROI boundary as feature points being tracked for raw rPPG signal extraction). The red points indicate the 68 landmarks being tracked in the face. Right: Dimensions of the ROI, where d is being adapted as it is from the study [7].
