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Paper Abstract and Keywords
Presentation 2009-10-24 14:40
Detection of optical flow based on local motion signals detected by spatiotemporal Gabor filter
Kouichi Arai, Akitoshi Hanazawa (Kyushu Inst. of Tech.) NC2009-48
Abstract (in Japanese) (See Japanese page) 
(in English) When we move to a target position in the presence of moving objects, we must judge their heading (or direction of self-motion) to avoid collision with the objects. For example, when we drive a car, we must avoid collision with an oncoming car or a person. Heading can be estimated by the velocity distribution of optical flow, which occurs by self-motion. When we move forward or backward, expansive or contractive motion having velocity gradients occurs across the visual field. The center of the expansion or contraction corresponds to heading. To detect the center of expansive or contractive optical flow, local motion directions must be detected and integrated. To detect local motion, we used spatiotemporal Gabor filter, a model of the simple cell in the visual cortex. Because velocity of objects depends on their distance from the observer when moving forward or backward, smooth velocity gradients in expansive or contractive optical flow do not exist in natural image sequences. To detect velocity gradients, a maximum filter which extracts maximum velocity in a limited area was applied to local velocity distributions. By using this method, heading was robustly estimated from optical flow.
Keyword (in Japanese) (See Japanese page) 
(in English) Image Processing / Optical Flow / Heading / Spatiotemporal Gabor Filter / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 252, NC2009-48, pp. 63-67, Oct. 2009.
Paper # NC2009-48 
Date of Issue 2009-10-16 (NC) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 NC  
Conference Date 2009-10-23 - 2009-10-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Saga University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2009-10-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Detection of optical flow based on local motion signals detected by spatiotemporal Gabor filter 
Sub Title (in English)  
Keyword(1) Image Processing  
Keyword(2) Optical Flow  
Keyword(3) Heading  
Keyword(4) Spatiotemporal Gabor Filter  
1st Author's Name Kouichi Arai  
1st Author's Affiliation Kyushu Institute of Technology (Kyushu Inst. of Tech.)
2nd Author's Name Akitoshi Hanazawa  
2nd Author's Affiliation Kyushu Institute of Technology (Kyushu Inst. of Tech.)
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Date Time 2009-10-24 14:40:00 
Presentation Time 25 
Registration for NC 
Paper # IEICE-NC2009-48 
Volume (vol) IEICE-109 
Number (no) no.252 
Page pp.63-67 
#Pages IEICE-5 
Date of Issue IEICE-NC-2009-10-16 

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