Fig. 6
From: Spatio-temporal and -spectral feature maps in photoplethysmography imaging and infrared thermography
Selection of feature maps of the baby measurement w/o movement: mean intensity is used as a visual reference. All dynamic maps show a noisy background pattern. The VIS maps especially show additional image content, all of which is caused by cast shadows and reflections of the researcher behind the cameras of the measurement setup. A corresponding reflection in LWIR can be identified in the right bottom image corner of the dynamic maps. A reflection of the baby, at least in the PPGI maps, carries pulsatile signals and, thus, is visible above the abdomen