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Paper Abstract and Keywords
Presentation 2012-09-03 15:30
Hierarchical Properties of Multi-resolutions of Optical Flow
Yusuke Kameda, Atsushi Imiya (Chiba Univ.), Tomoya Sakai (Nagasaki Univ.) PRMU2012-46 IBISML2012-29
Abstract (in Japanese) (See Japanese page) 
(in English) Most of the methods to compute optical flows are
variational-technique-based methods, which
assume that image functions have spatiotemporal continuities
and appearance motions are small.
In the viewpoint of the discrete errors of spatial- and
time-differentials,
the appropriate resolution for optical flow depends on both the
resolution and the frame rate of images
since there is a problem with the accuracy of the
discrete approximations of derivatives.
Therefore, for low frame-rate images, the appropriate
resolution for optical flow should be lower than the resolution of the
images.
However, many traditional methods estimate optical flow with the same
resolution as the images.
Therefore, if the resolution of images is too high, down-sampling the images
is effective for the variational-technique-based methods.
In this paper, we analyze the appropriate resolutions for optical
flows estimated by variational optical-flow computations from the
viewpoint of the error analysis of optical flows.
To analyze the appropriate resolutions, we use hierarchical structures
constructed from the multi-resolutions of images.
Numerical results show that decreasing image resolutions is
effective for computing optical flows by variational optical-flow
computations in low frame-rate sequences.
Keyword (in Japanese) (See Japanese page) 
(in English) optical flow / variational method / multi-resolution / low frame-rate / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 197, PRMU2012-46, pp. 149-155, Sept. 2012.
Paper # PRMU2012-46 
Date of Issue 2012-08-26 (PRMU, IBISML) 
ISSN Print edition: ISSN 0913-5685    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 PRMU2012-46 IBISML2012-29

Conference Information
Committee PRMU IBISML IPSJ-CVIM  
Conference Date 2012-09-02 - 2012-09-03 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To PRMU 
Conference Code 2012-09-PRMU-IBISML-CVIM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Hierarchical Properties of Multi-resolutions of Optical Flow 
Sub Title (in English)  
Keyword(1) optical flow  
Keyword(2) variational method  
Keyword(3) multi-resolution  
Keyword(4) low frame-rate  
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Keyword(6)  
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1st Author's Name Yusuke Kameda  
1st Author's Affiliation Chiba University (Chiba Univ.)
2nd Author's Name Atsushi Imiya  
2nd Author's Affiliation Chiba University (Chiba Univ.)
3rd Author's Name Tomoya Sakai  
3rd Author's Affiliation Nagasaki University (Nagasaki Univ.)
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Speaker Author-1 
Date Time 2012-09-03 15:30:00 
Presentation Time 30 minutes 
Registration for PRMU 
Paper # PRMU2012-46, IBISML2012-29 
Volume (vol) vol.112 
Number (no) no.197(PRMU), no.198(IBISML) 
Page pp.149-155 
#Pages 7 
Date of Issue 2012-08-26 (PRMU, IBISML) 

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