NDLI: A method for measuring respiration and physical activity in bed by optical flow analysis

Content Provider	IEEE Xplore Digital Library
Author	Nakajima, K. Osa, A. Miike, H.
Copyright Year	1997
Description	Author affiliation: Dept. of Kansei Design & Eng., Yamaguchi Univ., Ube, Japan (Nakajima, K.)
Abstract	A fully noncontact and unconstrained monitoring method, based on optical flow of movement of body surface that is developed by introducing image sequence analysis, is described. A spatiotemporal local optimization method is applied to determine optical flow in the image sequence. The optical flow visualizes the apparent velocity field of the entire body motion, including breast movement due to respiration and posture changes in a bed. A temporal increase in heart rate reflects the magnitude of physical activities. We propose two candidate parameters for evaluation of respiratory and physical activities based on comparison among experimental results. The average of squared motion velocities reflects the magnitude of physical activities. The representative field-averaged component shows a waveform with periodic fluctuation corresponding to that of respiration obtained with a nasal thermistor. This optical flow analysis is a promising new technique for evaluation of body motion for clinical use.
Starting Page	2054
Ending Page	2057
File Size	344951
Page Count	4
File Format	PDF
ISBN	0780342623
ISSN	1094687X
DOI	10.1109/IEMBS.1997.758752
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-30
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image motion analysis Monitoring Optical surface waves Image sequence analysis Spatiotemporal phenomena Optimization methods Image sequences Visualization Breast Heart rate
Content Type	Text
Resource Type	Article

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