Remote Photoplethysmography in FaceReader

FaceReader™ 7 offers you even more insight into your test participant. The software can now estimate heart rate of the subject in front of the camera by means of remote photoplethysmography (RPPG). With this add-on module additional information about arousal can be collected. It offers better insight into the mental state of a test participant!

What is RPPG? 

Remote PPG is a non-invasive technique which measures the small changes in color under the skin epidermis, caused by variations in volume and oxygen saturation of the blood in the vessels, due to heart beats. Each cardiac cycle appears as a peak in the FaceReader data.  Remote measurement of such signals is useful for various reasons, e.g. attachment of a sensor could cause discomfort, and cost more time.  The only recording you have to make is the video recording you were going to make already to measure the facial expressions of the test participant automatically.

Benefits 

  • Combine facial expression with heart rate analysis.
  • Measure responses without connecting sensors.
  • Usable as an additional indicator of arousal.
  • Physiological information is less sensitive to socially desirable answers.

Reference

  • Tasli H.E.; Gudi, A.; den Uyl, M. (2014). Integrating Remote PPG in Facial Expression Analysis Framework. Proceedings of the 16th International Conference on Multimodal Interaction, Istanbul, November 12-16, 2014, 74-75.
  • Tasli, H.E.; Gudi, A.; and den Uyl, M. (2014). Remote PPG based vital sign measurement using adaptive facial regions. Proceedings of 2014 IEEE International Conference on Image Processing (ICIP), October 27-30, 2014, pp. 1410-1414. doi: 10.1109/ICIP.2014.7025282. 
  • Reisner, A. T.; Shaltis, P. A.; McCombie, D.; Asada, H. H. (2008). Utility of the Photoplethysmogram in Circulatory Monitoring. Anesthesiology, 108, 950-958.