System and method for extracting a periodic signal from video

A system for extracting an estimated periodic signal from a video for patient cardiac or respiratory function assessment, the system comprising:

• a storage device;
• and
• a processor executing machine readable instructions which configure the processor to:
• receive a video of a subject in a scene, the video being captured by a video imaging device and comprising a plurality of time-sequential image frames of a scene containing an underlying motion signal g(t) desired to be extracted from the video;
• generate time-series signals from pixel values across the image frames in a temporal direction;
• select time-series signals of interest to obtain a set X+ of selected signals;
• aggregate the selected signals in X+ to generate an estimated periodic signal ĝ(t), where ĝ(t)≅cg(t) and c is an amplitude scaling factor, the estimated periodic signal corresponding to one of:
• cardiac or respiratory function;
• and
• communicate the estimated periodic signal to the storage device.

A computer implemented method for extracting a periodic signal from a video, the method comprising:

• a processor executing machine readable program instruction which configure the processor to:
• receive a video captured by a video imaging device, the video comprising a plurality of time-sequential image frames of a scene containing an underlying motion signal g(t);
• generate time-series signals from pixel values across the image frames in a temporal direction;
• select time-series signals of interest to obtain a set X+ of selected signals;
• and
• aggregate the selected signals in X+ to generate an estimated periodic signal ĝ(t), where ĝ(t)≅cg(t) and c is an amplitude scaling factor.