Estimating cardiac pulse recovery from multi-channel source data via constrained source separation

A system for cardiac pulse recovery and estimation from a video images captured of a subject of interest, the system comprising:

• a memory;
• and
• a processor in communication with said memory, said processor executing machine readable instructions for performing:
• receiving video images captured of a subject of interest intended to be monitored for cardiac function, said video images comprising source video data wherein at least one time varying cardiac source signal is embedded, said video images having been acquired over multiple channels of a video imaging device;
• generating a set of reference signals having a frequency range which approximates a frequency range of said subject's cardiac pulse;
• performing, using said set of reference signals, a constrained source separation on said source video data to obtain a first estimated source signal;
• for each reference signal:
• A) performing a constrained source separation on said source data to obtain a next estimated source signal;
• B) comparing said reference signal to said next estimated source signal;
• and
• repeating A thru B until all reference signals have been compared at least once;
• selecting an estimated source signal having a minimum error between the estimated source signal and a corresponding reference signal;
• and
• communicating at least one aspect of said selected estimated source signal to a computer system.