Method for detecting motion artifact using wavelet transform
AssigneeUniversity of Ulsan Foundation for Industry Cooperation
InventorsSungoh Kwon, Da Hee Ban
Life of this patent
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Abstract
A motion artifact detecting method using wavelet transform which is capable of removing the problem caused by a radio noise and a motion artifact generated during the measurement of a PPG signal which is one of bio-signals, the method including: measuring a PPG signal; generating a signal obtained by removing a radio noise from the measured PPG signal; setting a reference signal from the signal from which the radio noise is removed; selecting a base signal based on the set reference signal; performing wavelet transform using the base signal; and detecting and removing a motion artifact using the wavelet-transformed value.
Claims6
A motion artifact detecting method using wavelet transform, comprising:
- measuring a Photoplethysmography (PPG) signal through a multichannel;
- generating a signal obtained by removing a radio noise from the measured PPG signal;
- setting a reference signal from the signal from which the radio noise is removed, the reference signal being set at a first period after a predetermined time elapses;
- selecting a base signal based on the set reference signal and a plurality of base functions which can be wavelet-transformed;
- performing wavelet transform using the base signal;
- and
- detecting and removing a motion artifact using the wavelet-transformed value,
- the detecting a motion artifact further comprising,
- detecting a signal period when a heartbeat is activated;
- determining whether the signal period is shorter than a criterion period preset based on a change of peak to peak interval (PPI);
- if the signal period is shorter than the criterion period, determining that the motion artifact is included;
- and
- if the signal period is not shorter than the criterion period, determining that the motion artifact is included when a value obtained by adding powers for respective periods of a predetermined frequency band is a predetermined multiple or higher of a power of the reference signal.
Dependencies are inferred from the claim text.