Fig. 5.

Heartrate measurement with snapshot-hyperspectral-camera-based multispectral imaging system. (a) The overlaid face skin image of raw image with the derived map of hemoglobin absorption information (coded according to the color bar shown in the right). The red dotted box area on the cheek is the target area for extracting heartrate from blood absorption information content derived from the hyperspectral imaging. (b) The frequency spectrum of temporal profile of blood absorption information content summed within the red-box region in (a). (c) The heartrate reference from the PowerLab pulse sensor.