Figure 4

An example of the KF-based fusion method. From top to bottom: respiration rates derived from RS, RSA, QRS area, and PAT-based reparation waveforms, and the KF fusion results (black color) with no signal quality (fusion 0; 5th panel) and with the purity signal quality (fusion 2; 6th panel). The reference respiration rate is superimposed for comparison (red color). Clearly, inclusion of the signal quality improved fusion performance in the regions of poor signal quality (indicated by a black arrow).