Information: Join today and make your research activities more affordable! Technical workshop participation fees and annual registration fees are available at member rates.
Notice: [Important] Announcement of Changes to Registration Fee Payment and Manuscript Upload Procedures for IEICE Technical Meetings
IEICE Technical Committee Submission System
Conference Paper's Information		 Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2023-03-16 10:20
Calculation of Lyapunov Exponent for Imaging Photoplethysmogram
Hirofumi Nakayama, Nina Sviridova, Tohru Ikeguchi (TUS) MSS2022-81 NLP2022-126
Abstract (in Japanese) (See Japanese page) 
(in English) Photoplethysmogram is a biological signal of the cardiovascular system that measures changes in the amount of light reflected when light irradiates skin surface, and provides information such as heart rate, blood pressure, and blood oxygen saturation.
It has been suggested that photoplethysmograms have nonlinear, possibly chaotic, dynamical characteristics by applying nonlinear time series analysis to photoplethysmogram.
The results also suggests that physiological and mental health indicators can be extracted.
On the other hand, a method called imaging photoplethysmography, in which LED light is used as a light source and a camera as a receiver, has recently been introduced to estimate pulse waves from video images taken from the skin surface.
Although the imaging photoplethysmography is used to calculate heart rates and blood pressures in a similar way to the photoplethysmogram, it requires only simple and commercially available camera devices such as smartphones for measurement.
In this report, we investigate whether the imaging photoplethysmogram can capture nonlinear, possibly chaotic, dynamical characteristics of the photoplethysmogram.
First, we measured the photoplethysmogram and the imaging photoplethysmogram simultaneously. These trajectories in the phase space were reconstructed in the time delay coordinate system.
Next, the largest Lyapunov exponent was estimated to quantitatively evaluate orbit instability, or one of the essential characteristics of deterministic chaos.
The results showed that the reconstructed trajectories of the photoplethysmogram and imaging photoplethysmogram have recurrence structure and that the largest Lyapunov exponents of the imaging photoplethysmogram exhibit the positive value which indicates that the imaging photoplethysmogram has orbital instability.
Keyword (in Japanese) (See Japanese page) 
(in English) Nonlinear dynamics / Lyapunov exponent / Photoplethysmogram / Imaging Photoplethysmogram / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 436, NLP2022-126, pp. 95-99, March 2023.
Paper # NLP2022-126 
Date of Issue 2023-03-08 (MSS, NLP) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MSS2022-81 NLP2022-126

Conference Information
Committee NLP MSS  
Conference Date 2023-03-15 - 2023-03-17 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NLP 
Conference Code 2023-03-NLP-MSS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Calculation of Lyapunov Exponent for Imaging Photoplethysmogram 
Sub Title (in English)  
Keyword(1) Nonlinear dynamics  
Keyword(2) Lyapunov exponent  
Keyword(3) Photoplethysmogram  
Keyword(4) Imaging Photoplethysmogram  
Keyword(5)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hirofumi Nakayama  
1st Author's Affiliation Tokyo University of Science (TUS)
2nd Author's Name Nina Sviridova  
2nd Author's Affiliation Tokyo University of Science (TUS)
3rd Author's Name Tohru Ikeguchi  
3rd Author's Affiliation Tokyo University of Science (TUS)
4th Author's Name  
4th Author's Affiliation ()
5th Author's Name  
5th Author's Affiliation ()
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
21st Author's Name  
21st Author's Affiliation ()
22nd Author's Name  
22nd Author's Affiliation ()
23rd Author's Name  
23rd Author's Affiliation ()
24th Author's Name  
24th Author's Affiliation ()
25th Author's Name  
25th Author's Affiliation ()
26th Author's Name / /
26th Author's Affiliation ()
()
27th Author's Name / /
27th Author's Affiliation ()
()
28th Author's Name / /
28th Author's Affiliation ()
()
29th Author's Name / /
29th Author's Affiliation ()
()
30th Author's Name / /
30th Author's Affiliation ()
()
31st Author's Name / /
31st Author's Affiliation ()
()
32nd Author's Name / /
32nd Author's Affiliation ()
()
33rd Author's Name / /
33rd Author's Affiliation ()
()
34th Author's Name / /
34th Author's Affiliation ()
()
35th Author's Name / /
35th Author's Affiliation ()
()
36th Author's Name / /
36th Author's Affiliation ()
()
Speaker Author-1 
Date Time 2023-03-16 10:20:00 
Presentation Time 20 minutes 
Registration for NLP 
Paper # MSS2022-81, NLP2022-126 
Volume (vol) vol.122 
Number (no) no.435(MSS), no.436(NLP) 
Page pp.95-99 
#Pages 5 
Date of Issue 2023-03-08 (MSS, NLP) 

[Return to Top Page]

[Return to IEICE Web Page]
The Institute of Electronics, Information and Communication Engineers (IEICE), Japan