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Adaptive Thresholding with Inverted Triangular Area for Real-Time Detection of the Heart Rate from Photoplethysmogram Traces on a Smartphone
University of Borås, Swedish School of Library and Information Science.
2014 (English)Conference paper (Refereed)
Abstract [en]

Photoplethysmogram (PPG) signals acquired by smartphone cameras are weaker than those acquired by dedicated pulse oximeters. Furthermore, the signals have lower sampling rates, have notches in the waveform and are more severely affected by baseline drift, leading to specific morphological characteristics. This paper introduces a new feature, the inverted triangular area, to address these specific characteristics. The new feature enables real-time adaptive waveform detection using an algorithm of linear time complexity. It can also recognize notches in the waveform and it is inherently robust to baseline drift. An implementation of the algorithm on Android is available for free download. We collected data from 24 volunteers and compared our algorithm in peak detection with two competing algorithms designed for PPG signals, Incremental-Merge Segmentation (IMS) and Adaptive Thresholding (ADT). A sensitivity of 98.0 % and a positive predictive value of 98.8 % were obtained, which were 7.7 % higher than the IMS algorithm in sensitivity, and 8.3 % higher than the ADT algorithm in positive predictive value. The experimental results confirmed the applicability of the proposed method.

Place, publisher, year, edition, pages
IEEE , 2014.
Keyword [en]
PPG, heart rate, real-time, thresholding, biomedical engineering
National Category
Signal Processing
Research subject
Library and Information Science
URN: urn:nbn:se:hb:diva-7211Local ID: 2320/14032OAI: diva2:887920
36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Chicago, IL, 26-30 August, 2014.
Available from: 2015-12-22 Created: 2015-12-22

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Wittek, Peter
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Swedish School of Library and Information Science
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