Enhancing Fiducial Point Detection in Imaging Photoplethysmography Through Spatial Fusion

Camera iPPG spatial fusion that weights local patches by SNR / perfusion index / SQI to preserve waveform morphology under cuff-induced perfusion impairment. Dataset: synchronized iPPG + reference PPG, 20 healthy participants (baseline / light / moderate impairment). Under moderate impairment, reports up to +8 pp detection-rate gains for dicrotic notch and diastolic peak vs conventional spatial averaging (p < 0.01); onset and systolic peak unchanged.

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Imaging photoplethysmography (iPPG) enables contactless assessment of blood volume changes but is susceptible to noise, particularly under impaired perfusion. This work proposes a spatial fusion approach that weights local iPPG signals based on signal quality metrics (SNR, Perfusion Index, Signal Quality Index) to preserve waveform morphology. The method is evaluated on a dataset comprising synchronized iPPG and reference PPG recordings from 20 healthy participants under baseline, light, and moderate cuff-induced perfusion impairment. Detection performance is quantified using the detection rate (DR) of fiducial points (FP). Results demonstrate a significant improvement in DR with spatial fusion compared to conventional spatial averaging. Under moderate impairment, gains of up to 8 percentage points are observed for dicrotic notch and diastolic peak detection (p < 0.01), while onset and systolic peak detection remain unaffected.

Verbatim from the publisher's DOI record (opens in a new tab) · Publisher licence: http://creativecommons.org/licenses/by/4.0

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