An advanced detrending method with application to HRV analysis

By Mika P. Tarvainen, Perttu O. Ranta-aho, Pasi A. Karjalainen. IEEE Transactions on Biomedical Engineering, 2002

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Remote Heart Rate Measurement from Face Videos under Realistic Situations (2014, methodology): “Here we use three filters: the first one is a detrending filter based on a smoothness priors approach [18], which is used for reducing slow and non-stationary trend of the signal.”
Software for advanced HRV analysis (2004, methodology): “Detrending options include removal of the first or second order linear trend or the trend can be removed using the so called smoothness priors method presented in [6].”