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| 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 |
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| 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 | |
| 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 | NC2009-48 |
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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 |
| Keyword(5) | |
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| Keyword(8) | |
| 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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| Speaker | Author-1 |
| Date Time | 2009-10-24 14:40:00 |
| Presentation Time | 25 minutes |
| Registration for | NC |
| Paper # | NC2009-48 |
| Volume (vol) | vol.109 |
| Number (no) | no.252 |
| Page | pp.63-67 |
| #Pages | 5 |
| Date of Issue | 2009-10-16 (NC) |
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