Objective Baseline drift of pulse waveform caused by breathing and physical movement needs to be removed in pulse wave detection process. This paper presents a removal method of pulse waveform baseline drift using cubic spline interpolation. Methods Starting points of pulse waveform are selected to be the spline interpolation point. And cubic spline interpolation according to the starting points is used to fit the baseline drift. Subsequently, pulse waveform of baseline drift removed is obtained by pulse wave data minus the corresponding baseline drift values. Results The actual measurement results show that pulse waveform after removing baseline drift shows a stable baseline drift and a stable waveform. Conclusion The method of cubic spline interpolation can inhibit the baseline drift effectively. The method and can be well applied in realtime detection of pulse wave.
|