Determining cardiac arrhythmia from a video of a subject being monitored for cardiac function

摘要

What is disclosed is a system and method for processing a time-series signal generated by video images captured of a subject of interest in a non-contact, remote sensing environment such that the existence of a cardiac arrhythmia can be determined for that subject. In one embodiment, a time-series signal generated is received. The time-series signal was generated from video images captured of a region of exposed skin where photoplethysmographic (PPG) signals of a subject of interest can be registered. Signal separation is performed on the time-series signal to extract a photoplethysmographic signal for the subject. Peak-to-peak pulse points are detected in the PPG signal using an adaptive threshold technique with successive thresholds being based on variations detected in previous magnitudes of the pulse peaks. The pulse points are then analyzed to obtain peak-to-peak pulse dynamics. The existence of cardiac arrhythmias is determined for the subject based on the pulse dynamics.

主权项

1. A method for detecting cardiac arrhythmia from signals generated from video images captured of a subject of interest being monitored for cardiac function in a non-contact remote sensing environment, the method comprising:
receiving a time-series signal generated from video images captured of a region of exposed skin where a photoplethysmographic (PPG) signal of a subject of interest can be registered, said video comprising video images captured by at least one imaging channel capturing PPG signals; processing said time-series signal to extract a PPG signal for said subject; filtering said PPG signal to obtain a filtered PPG signal, said filtering comprising:y⁡(n)=1N⁢∑1N⁢x⁡(n-i) where N is a number of frames in a moving window, x is said unfiltered PPG signal, n is a current frame and i is an index designating said moving window frame; detecting peak-to-peak pulse points in said filtered PPG signal; analyzing said pulse points to obtain peak-to-peak pulse dynamics; and determining whether a cardiac arrhythmia exists based on said pulse dynamics.