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Fig. 9 | BioMedical Engineering OnLine

Fig. 9

From: Camera-based photoplethysmography in an intraoperative setting

Fig. 9

Signal examples where artifacts occurred. Related signal segments for the R, G, B and NIR channel where the HR was detected correctly solely in the NIR signal. The ROIs were well-defined in both videos. Light variations in the ambient light caused artifacts to occur in the RGB video while the NIR video remained unaffected (cardiac pulse is visible). Please note that the strength of the pulsatile component usually does not exceed \(\pm 15\) units for the set color depth

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