Fig. 5: Application of thresholds in quality assessment of rPPG for near contact-level cardiac monitoring.
From: Optimal signal quality index for remote photoplethysmogram sensing
This figure illustrates the application of predetermined quality thresholds to assess the signal quality of remote photoplethysmography (rPPG) signals, reconstructed from facial videos for real-time cardiac monitoring, aiming for a precision comparable to traditional contact-based PPG signals from the fingertip. It showcases how Signal Quality Indices (SQIs) thresholds are utilized to differentiate among rPPG signals. This approach provides immediate signal quality feedback, offering a practical tool for researchers to refine rPPG-based cardiac analysis technologies.
