Video-based vital sign monitoring system of patients in intensive care unit

摘要

In this paper, the video-based vital sign monitoring system is proposed to continuously evaluate breathing parameters, heart rate, heart rate variability, peripheral microvasculature state and psycho-emotion state. The system contains two low-cost Logitech C920 webcams with 640×480 pixel resolution and 30 Hz sampling frequency. They were placed at a distance of 80 cm above the patient. The analysis of patient functional state was carried out by using original software that automatically identifies physiological patterns: spontaneous breathing recovery during the artificial ventilation, presence and ratio of diaphragmatic and thoracic breathing, the frequency and adequacy of spontaneous breathing, moment of patient consciousness recovery, heart rate and heart rate variability, motor activity and muscle tone, sedation and analgesia quality of postoperative patients. The proposed system can be used as an additional diagnostic tool of non-invasive anesthesia equipment to obtain complex physiological information about the patient.