Patent ID: 9036877
Filing Date: 2015-05-19
Classification: A61B,G06K,G06T,G16H

Abstract:
1. A method for extracting photoplethysmographic (PPG) signals (i.e., cardiac signals) on a continuous basis from signals generated from batches of video images captured of a subject 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; dividing said time-series signal into batches for processing, with successive batches having at least a 95% overlap with a previous batch; processing each of said batches of time-series signals to obtain a PPG signal from each batch; and stitching together said PPG signal from each batch to form a continuous PPG signal, said stitching comprising using mid-point stitching.