Figure 2
From: On the cardiorespiratory coordination assessed by the photoplethysmography imaging technique
Measurement setup. Subjects lied comfortably on a patient bench. Face and upper part of the were illuminated by a white OLED panel. Regions of interest (ROIs) sensed by the vision camera were the forehead (squared blue ROI) and the chest (solid blue ROI). The examiner assisted subjects to place their hands in bowls with ambient or cold water.
