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(a) Depth camera system schematic illustrating the field of view (FOV) and region of interest (ROI) and the processing of the ROI information to produce the respiratory volume (RV) signal. T is the length of a time window used in the calculation of respiratory rate. (b) Respiratory volume signal acquired from a heathy volunteer using a KinectTM V2 depth camera (Microsoft, Redmond, WA, USA). Triangles indicate the peaks and troughs of the signal modulations.
