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ROI definition

SR Stefan Rasche
RH Robert Huhle
EJ Erik Junghans
MA Marcelo Gama de Abreu
YL Yao Ling
AT Alexander Trumpp
SZ Sebastian Zaunseder
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Our analysis focused on signals from the forehead because it is well perfused and has a large, homogeneous and plane area, which helps to avoid ballistocardiographic effects15,20. The same procedure to define the ROI was applied to iPPG and LSI recordings (Fig. 3). The ROI was kept statically throughout each measurement epoch. A tape on the subject forehead served as base for ROI definition (a). The area within the tape was identified (b) and the smallest circumscribing rectangle (c) was fitted. Through moving inward, the largest inscribing rectangle (d) was defined. This rectangle was reduced by 20 pixels in length and width (e) in order to account for slight body movements that otherwise might cause the tape to enter the static ROI (f) and introduce undesired effects. All ROIs were visually verified.

ROI definition algorithm. See text for details.

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