Photoplethysmography (PPG) is a low cost non-invasive
optical technique that can be used to assess changes in tissue
blood volume [6]. This method provides valuable information
related to the cardiovascular system. The tissue's region is
illuminated using a light source and a photodetector records
the reflected light, which varies depending on the presence
and concentration of RBCs and their oxygenation levels.
Depending on the oxygenation level of hemoglobin, RBCs
absorb light in different ways. When blood volume in the
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