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Ambient-light Photoplethysmography: - How can I tell your pulse from looking at your face?
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

This thesis is an attempt to explore certain aspects of the subject called non- contact, ambient-light photoplethysmography, where we hope to reveal benecial properties the technique may have. We have a clear focus on technical possibility but the medical relevance of it is also discussed and conrmed. Conclusions from previous work are exemplied { the ability we have with this method to compute an exact heart rate estimate, from the skin surface both on our face and in the palm of our hand, with and without the subject moving during recording; the presence of signal uctuations akin to those of breathing. Moreover, that the pulsations are strong enough to enable subdivision into smaller segments and a mapping of how the pulse amplitude is distributed among them. Other information is obtained: the phase information contained in the signal is robust enough that not only the average heart rate over some time but also its short time variability can be seen with more than a minimum of detail resolution. From a recording where both face and hand is in view, we further substantiate the claim of phase robustness by estimating the phase delay, i.e. the dierence in blood pressure wave travel time between forehead and palm. The concept of Independent Component Analysis has been suggested as a way of improving the output of the method|a procedure we investigate and nd limited support for. Other, more simplistic signal processing approaches are found to have positive traits in achieving overall signal clarity.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2012. , 79 p.
Keyword [no]
ntnudaim:7101, MTEL elektronikk, Signalbehandling i medisinske anvendelser
URN: urn:nbn:no:ntnu:diva-18848Local ID: ntnudaim:7101OAI: diva2:566318
Available from: 2012-11-08 Created: 2012-11-08

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