Why are ECG devices more accurate than PPG devices?

Last Updated on February 1, 2023 by pg@petergamma.org

Heart rate measurement is based on peak detection. ECG devices have high peaks, PPG devices have round peaks. Will PPG devices ever reach the accuracy of PPG devices?

Paul van Gent wrote a PhD thesis about HeartPy. But during his PhD thesis, he decided to make an open source project out if it. His PhD thesis was about noise removal in PPG signals, to increase the accuracy of PPG devices. Was the project not interesting enough to develop it further?