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Remote Measurements of Heart and Respiration Rates for Telemedicine

Figure 6

Measurement results for different kinds of subjects.

(A) Thirty seconds video of a one-month old infant was recorded at 30fps when he was sleeping. The face area and shoulder area are selected as the ROI for cardiovascular pulse measurement and respiration measurement, respectively (Figure 7A). In the spectrum of the BVP signal (Figure 7H), a clear peak at 2.15 Hz corresponds to the HR of 129 bpm. In the spectrum of the breath wave signal (Figure 7I), an obvious peak at 0.73 Hz corresponds to the RR of 44 breaths/min. Written consent from the child’s parents had been obtained. (B) A high speed camera (Stingray F-033B/C with 80fps) was used to capture images of a mouse at rest over a period of about 10 seconds. Figure 8 demonstrates the procedure of recovering the HR and RR of a mouse from a single channel images. The measurement result of RR is 230 breaths/min and the measurement result of HR is 686 bpm. (C) For measuring adult zebrafish (roy/roy; alb/alb), we used tricaine to slightly anesthetize before the images were captured at 15 fps over a period of about 30 seconds in length. The ROI for cardiovascular pulse measurement and respiration measurement is the heart area and gilles area, respectively (Figure 9A). The measurement result for HR is 78 bpm and for RR is 102 breaths/min (for signal plot, see Figure 9). (D) The face area and abdomen area of the pig are chosen as the ROI for cardiovascular pulse measurement and respiration measurement, respectively (Figure 10A). The measurement results of HR and RR are 64 bpm and 19 breaths/min, respectively (for signal plot, see Figure 10). (E) A video of Phelps before 200 M butterfly competition downloaded from YouTube (http://www.youtube.com/watch?v=ftHlLqamWlM). The recovered HR from 3 seconds time period selected from the video is 49 bpm. (F) Post-race interview of Michael Phelps (after his 200 Fly meet) downloaded from YouTube (http://www.youtube.com/watch?v=HHy7QKEV310). The interview video was recorded at 29 fps with pixel resolution of 1280×720. Two time periods both about 3 seconds in length were selected from the video to recover the HR of Phelps (Figure 11). The time interval between two time periods is within one minute. The measurement results of HR for the first and second time periods are 123bpm and 126bpm, respectively. The RR was also extracted from the video over a period of about 7 seconds. The measurement result of RR is 28 breaths/min (for signal plot, see Figure 12). Reprinted from [43] under a CC BY license, with permission from [Longhorn Network], original copyright [2012]

Figure 6

doi: https://doi.org/10.1371/journal.pone.0071384.g006