Spatio-temporal and -spectral feature maps in photoplethysmography imaging and infrared thermograph.

Background: Only a small fraction of the information available is generally used in the majority of camera-based sensing approaches for vital sign monitoring. Dedicated skin pixels, for example, fall into this category while other regions are often disregarded early in the processing chain.

Methods: We look at a simple processing chain for imaging where a video stream is converted to several other streams to investigate whether other image regions should also be considered.