BeliefPPG: Uncertainty-aware Heart Rate Estimation from PPG signals via Belief PropagationDownload PDF

Published: 08 May 2023, Last Modified: 26 Jun 2023UAI 2023Readers: Everyone
Keywords: PPG, Heart Rate, Deep Learning, Uncertainty, Probabilistic Artificial Intelligence, Belief Propagation, Viterbi Decoding, Message Passing
TL;DR: Uncertainty-aware Heart Rate Estimation from PPG signals via Belief Propagation.
Abstract: We present a novel learning-based method that achieves state-of-the-art performance on several heart rate estimation benchmarks extracted from photoplethysmography signals (PPG). We consider the evolution of the heart rate in the context of a discrete-time stochastic process that we represent as a hidden Markov model. We derive a distribution over possible heart rate values for a given PPG signal window through a trained neural network. Using belief propagation, we incorporate the statistical distribution of heart rate changes to refine these estimates in a temporal context. From this, we obtain a quantized probability distribution over the range of possible heart rate values that captures a meaningful and well-calibrated estimate of the inherent predictive uncertainty. We show the robustness of our method on eight public datasets with three different cross-validation experiments.
Supplementary Material: pdf
Other Supplementary Material: zip
0 Replies