Light and Displacement Compensation-Based iPPG for Heart-Rate Measurement in Complex Detection Conditions

• Published in: Sensors (Basel, Switzerland) Vol. 24; no. 11; p. 3346
• Main Authors: Bi, Shubo, Wang, Haipeng, Zhang, Shuaishuai
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 23.05.2024; MDPI
• Subjects: Accuracy; Algorithms; Comparative analysis; displacement compensation; Heart rate; heart-rate measurement; Human body; iPPG; Light; light compensation; Measurement; Sensors; Skin; displacement compensation; heart-rate measurement; iPPG; light compensation
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s24113346

A light and displacement-compensation-based iPPG algorithm is proposed in this paper for heart-rate measurement in complex detection conditions. Two compensation sub-algorithms, including light compensation and displacement compensation, are designed and integrated into the iPPG algorithm for more accurate heart-rate measurement. In the light-compensation sub-algorithm, the measurement deviation caused by the ambient light change is compensated by the mean filter-based light adjustment strategy. In the displacement-compensation sub-algorithm, the measurement deviation caused by the subject motion is compensated by the optical flow-based displacement calculation strategy. A series of heart-rate measurement experiments are conducted to verify the effectiveness of the proposed method. Compared with conventional iPPG, the average measurement accuracy increases by 3.8% under different detection distances and 5.0% under different light intensities.