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. Author manuscript; available in PMC: 2013 May 13.
Published in final edited form as: IEEE Trans Biomed Eng. 2012 Jun 14;59(9):10.1109/TBME.2012.2204882. doi: 10.1109/TBME.2012.2204882

Fig. 6.

Fig. 6

Estimated SQI as a function of SNR simulated with additive white Gaussian noise. The PPG signal is the target. The SQI is a monotonic function of SNR, and asymptotically approaches 0 and 1.