Artificial Life and Robotics

, Volume 23, Issue 3, pp 345–352 | Cite as

Noncontact pulse wave detection by two-band infrared video-based measurement on face without visible lighting

  • Ryota MitsuhashiEmail author
  • Genki Okada
  • Koki Kurita
  • Keiichiro Kagawa
  • Shoji Kawahito
  • Chawan Koopipat
  • Norimichi Tsumura
Original Article


In this paper, we propose a novel noncontact pulse wave monitoring method that is robust to fluctuations in illumination through use of two-band infrared video signals. Because the proposed method uses infrared light for illumination, the method can be used to detect a pulse wave on a human face without visible lighting. The corresponding two-band pixel values in the video signals can be separated into hemoglobin and shading components by application of a separation matrix in logarithmic space for the two pixel values. Because the shading component has been separated, the extracted hemoglobin component is then robust to fluctuations in the illumination. The pixel values in the region of interest were spatially averaged over all the pixels of each frame. These averaged values were then used to form the raw trace signal. Finally, the pulse wave and the corresponding pulse rate were obtained from the raw trace signal through several signal processing stages, including detrending, use of an adaptive bandpass filter, and peak detection. We evaluated the absolute error rate for the pulse rate between the estimated value and the ground truth obtained using an electrocardiogram. In the experiments, we found that the performance of the proposed method was greatly improved compared with that of conventional methods using single-band infrared video.


Pulse wave Pulse rate Infrared Noncontact measurement 



This work was supported in part by the MEXT/JST COI STREAM program.


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Copyright information

© ISAROB 2018

Authors and Affiliations

  • Ryota Mitsuhashi
    • 1
    Email author
  • Genki Okada
    • 1
  • Koki Kurita
    • 2
  • Keiichiro Kagawa
    • 2
  • Shoji Kawahito
    • 2
  • Chawan Koopipat
    • 3
  • Norimichi Tsumura
    • 1
  1. 1.Graduate School of Advanced Integration ScienceChiba UniversityChibaJapan
  2. 2.Research Institute of ElectronicsShizuoka UniversityHamamatsuJapan
  3. 3.Department of Imaging and Printing TechnologyChulalongkorn UniversityBangkokThailand

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