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Paper Abstract and Keywords
Presentation 2017-12-16 14:15
A deterioration discrimination method of infrared reflective marker used for optical motion capture system.
Ohbuchi Masashi, Toyohiko Hayashi, Shigehito Tanahashi (Niigata Univ.), Hiroshi Tanaka, Hiroaki Inui, Hiroki Ninomiya, Katsuya Nobuhara (Nobuhara Hospital) MBE2017-61
Abstract (in Japanese) (See Japanese page) 
(in English) The optical motion capture system can measure the 3-D motion of infrared light reflective markers secured to measuring objects. One of its problems is that repetitive use of the markers gradually deteriorates their reflection characteristic due to the separation and/or stain of a reflective material, resulting in the increase of measurement error. In measurement site, however, deteriorated markers might be still used because the marker deterioration has been judged subjectively. Then this study proposed a digital camera-based method of judging the marker deterioration objectively and easily in measuring site. In order to reduce light environment effects, we photographed a subject marker and a referential normal marker located next to the subject simultaneously. Then we evaluated the deterioration level of the subject from the difference between the gray-scale histograms of images of the subject and the reference, and judged whether the subject is deteriorated or not by means of discriminant analysis. Experiments using 25 deteriorated markers and 10 normal markers verified that the subject could be judged in a positive discrimination rate of 88.0[%]
Keyword (in Japanese) (See Japanese page) 
(in English) Infrared reflective marker / Optical motion capture system / Marker deterioration / Marker discrimination / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 360, MBE2017-61, pp. 45-50, Dec. 2017.
Paper # MBE2017-61 
Date of Issue 2017-12-09 (MBE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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)
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Conference Information
Committee MBE NC  
Conference Date 2017-12-16 - 2017-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ME, general 
Paper Information
Registration To MBE 
Conference Code 2017-12-MBE-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A deterioration discrimination method of infrared reflective marker used for optical motion capture system. 
Sub Title (in English)  
Keyword(1) Infrared reflective marker  
Keyword(2) Optical motion capture system  
Keyword(3) Marker deterioration  
Keyword(4) Marker discrimination  
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1st Author's Name Ohbuchi Masashi  
1st Author's Affiliation Niigata University (Niigata Univ.)
2nd Author's Name Toyohiko Hayashi  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Shigehito Tanahashi  
3rd Author's Affiliation Niigata University (Niigata Univ.)
4th Author's Name Hiroshi Tanaka  
4th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
5th Author's Name Hiroaki Inui  
5th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
6th Author's Name Hiroki Ninomiya  
6th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
7th Author's Name Katsuya Nobuhara  
7th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
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Speaker Author-1 
Date Time 2017-12-16 14:15:00 
Presentation Time 25 minutes 
Registration for MBE 
Paper # MBE2017-61 
Volume (vol) vol.117 
Number (no) no.360 
Page pp.45-50 
#Pages 6 
Date of Issue 2017-12-09 (MBE) 

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