Figure 5.

Gold-standard SCG${}^{\mathrm{g}}$ (black) and vision-based SCG${}^{\mathrm{v}}$ (blue) signals in x (right-to-left) and y (head-to-foot) directions (top and bottom panels, respectively) obtained from a male participant during breath-hold at the end of inhalation (subject 9, the middle accelerometer and QR code). SCG segments are shown in the middle panel. The bold black and blue waveforms represent the ensemble average of the segments. The distance matrix of dynamic time warping analysis, the warping path (black line), the straight-line fit (green dashed line), and the similarity index S using (10) are shown at right.