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Determination of respiration signal applying nasal and oral breathing decision based on SQI. (a) Thermal facial image with ROI. (b) Mean and minimum temperature fluctuations in nasal area. (c) SQI parameter obtained by power spectral density (PSD), autocorrelation (ACR) and cross-power spectral density (CPSD) of nasal temperature changes. (d) Mean and minimum temperature fluctuations in oral area. (e) SQI parameter obtained by PSD, ACR and CPSD.
