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The processing pipeline for contactless SpO2 estimation with an RGB camera. The selected region-of-interest (ROI) is tracked to compensate for head movements during acquisition. The ROI is downsampled and for each sub-region (skin patch) the ‘ratio-of-ratios’ (RoR), i.e. the ratio of the relative PPG amplitudes of the two wavelengths, is calculated. The final RoR for a specific time instance is calculated by weighting the skin patches by their corresponding values of the quality metric.
