Fig 1.
Illustration of BR and HR related frequencies on Fourier power spectrum extracted from one raw signal.
Fig 2.
Experimental setup of this study.
Fig 3.
Workflow of the dual-camera system.
Fig 4.
Near-infrared face detection via the combined use of the pre-trained Boosted Cascade classifier and deep classification net.
Fig 5.
Cross-modality ROI detection and tracking.
Fig 6.
Proposed signal extraction method for BR (left column) and HR (right column) measurements.
Fig 7.
Statistical analysis of BR measurement using dual-mode imaging system under simulated sleep situation: (a) correlation between measured and reference BR; and (b) Bland-Altman plot (N = 26) of the difference against average for BR via the reference method (BRref) and bimodal imaging system (BRim). (The different colors represent different volunteers).
Fig 8.
Statistical analysis of HR measurement using dual-mode imaging system under simulated sleep situation: (a) correlation between measured and reference HR; and (b) Bland-Altman plot (N = 25) of the difference against average for HR via the reference method (HRref) and bimodal imaging system (HRim). (The different colors denote different volunteers).