Analyzing pulse from head motions in video
Name
880382359-MIT.pdf
Description
Full printable version
Size
8.42 MB
Format
Adobe PDF
Checksum (MD5)
018d405a230c3c48f8695f26d5b6031e
Author(s)
Balakrishnan, Guha
Advisor(s)
John Guttag and Fredo Durand.
Date Issued
2014
Publisher
Massachusetts Institute of Technology
Abstract
We extract heart rate and beat lengths from videos by measuring subtle head oscillations that accompany the cardiac cycle. Our method tracks features on the head, temporally filters their trajectories and performs principal component analysis (PCA) to decompose the trajectories into a set of ID component motions. It then chooses the component that is most periodic as the pulse signal. Finally, we identify peaks of the chosen signal, which correspond to heartbeats. When evaluated on 18 subjects our approach reported heart rates nearly identical to an electrocardiogram (ECG) device for all subjects and obtained similar beat length distributions for 17. In addition we obtained pulse rate from videos of the back of the head and of sleeping newborns. Initial findings also show that our method can measure heart rate from body parts other than the head and can measure respiration rate by selecting a different frequency band. Finally, we present visualization techniques such as motion magnification for subjective analysis of body motions
Description
Thesis: S.M. in Computer Science and Engineering, Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 71-73).
Subjects
Electrical Engineering and Computer Science.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
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