Key result
Contactless complexion-tracking pulse monitor measures heart rate within ~5 bpm across all lighting conditions.
Why the study?
Subject movement and dark environments increase the difficulty of image-based contactless pulse rate detection, necessitating improved methods for accurate measurement.
A novel FPGA-based contactless pulse rate monitoring system using complexion tracking and NIR LEDs maintains accuracy despite subject movement and dark environments.
May enable remote monitoring in varied conditions; leaves open clinical validation before practice adoption.
Subject movement and a dark environment will increase the difficulty of image-based contactless pulse rate detection. In this paper, we detected the subject's motion status based on complexion tracking and proposed a motion index (MI) to filter motion artifacts in order to increase pulse rate measurement accuracy. Additionally, we integrated the near infrared (NIR) LEDs with the adopted sensor and proposed an effective method to measure the pulse rate in a dark environment. To achieve real-time data processing, the proposed framework is constructed on a Field Programmable Gate Array (FPGA) platform. Next, the instant pulse rate and motion status are transmitted to a smartphone for remote monitoring. The experiment results showed the error of the pulse rate detection to be within -3.44 to +4.53 bpm under sufficient ambient light and -2.96 to + 4.24 bpm for night mode detection, when the moving speed is higher than 14.45 cm/s. These results demonstrate that the proposed method can improve the robustness of image-based contactless pulse rate detection despite subject movement and a dark environment.
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Lin et al. (2017) studied this question. Real-time contactless pulse rate and motion status monitoring system based on complexion tracking was evaluated on Error of pulse rate detection. A real-time contactless pulse rate monitoring system based on complexion tracking achieved an error margin of -3.44 to +4.53 bpm under sufficient light and -2.96 to +4.24 bpm in night mode.
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