US 11,672,436 B2
Pulse detection from head motions in video
Guha Balakrishnan, Cambridge, MA (US); John V. Guttag, Lexington, MA (US); and Frederic Durand, Somerville, MA (US)
Assigned to MASSACHUSETTS INSTITUTE OF TECHNOLOGY, Cambridge, MA (US)
Filed by Massachusetts Institute of Technology, Cambridge, MA (US)
Filed on Mar. 19, 2020, as Appl. No. 16/824,206.
Application 16/824,206 is a continuation of application No. 14/315,174, filed on Jun. 25, 2014, granted, now 10,638,942.
Claims priority of provisional application 61/839,563, filed on Jun. 26, 2013.
Prior Publication US 2020/0214575 A1, Jul. 9, 2020
Int. Cl. A61B 5/024 (2006.01); A61B 5/0255 (2006.01); A61B 5/11 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/024 (2013.01) [A61B 5/004 (2013.01); A61B 5/0255 (2013.01); A61B 5/1128 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method of monitoring vital signs comprising:
in a digital processor:
receiving an input video of an upper body portion of a subject, the input video being formed of a sequence of frames, each frame: (i) providing a respective image of the upper body portion, (ii) having spatial locations corresponding to feature points in the image, and (iii) representing a data point in a position-time series of the sequence of frames, each location being a pixel representing visible light spectrum;
forming a location-time series returning the spatial locations of each feature point across plural frames of the input video; and
from the formed location-time series and the position-time series, detecting a pulse signal and extracting pulse rate measurements, said extracting including output of a pulse rate or a heart rate of the subject shown in the video.