Patent ID: 8977347
Filing Date: 2015-03-10
Classification: A61B,G16H

Abstract:
1. A method for estimating heart rate variability from a video captured of a subject of interest, the method comprising: receiving a video captured of a target area of a region of exposed skin of a subject of interest where a photoplethysmographic (PPG) signal of said subject can be registered, said video comprising video images captured by a video camera; selecting a first batch of said video images for processing; identifying a first region of interest (ROI) in said selected batch of video images for processing; and A) processing pixels in said ROI of said selected batch of said video images to obtain a time-series signal containing a PPG signal captured by said imaging channel of said video camera; B) processing said time-series signal to extract said PPG signal; C) calculating a power spectral density function on said PPG signal; D) using a peak detection algorithm to detect low frequency and high frequency components over a pre-defined frequency range from said power spectral density function; E) in response to a low frequency peak or a high frequency peak not being detected in said power spectral density function, performing at least one of: F) determining a ratio of said low and high frequency components over said interval of said selected batch, said ratio comprising said subject's estimated heart rate variability for said interval.