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| Presentation | 2019-03-07 11:35 A Proposal of Image Lightness Conversion and Sharpening Taking Account of Visual Feature of Elderly Person Daiki Moriyama (Yamaguchi Univ.), Chiaki Ueda (Okayama Univ. of Science), Tadahiro Azetsu (Yamaguchi Prefectural Univ.), Noriaki Suetake, Eiji Uchino (Yamaguchi Univ.)  SIS2018-49 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The performance of human visual functions degrades with age. For instance, the visual field becomes dark owing to a decrease of the amount of light received. Moreover, objects appear to be hazy by a decrease in the contrast sensitivity. Especially, the contrast sensitivity decreases remarkably as the spatial frequency increases. In this report, we propose an image enhancement method which consists of a lightness conversion taking account of visual characteristics of elderly persons and an amplification of high spatial frequency components. Concretely, the lightness conversion is conducted within the color gamut by using a tone mapping. In addition, a sharpening based on the inverse characteristic function of the sensitivity decay curve is applied. The effectiveness of the proposed method is verified by experiments using several digital images. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Elderly person / Tone mapping / Spatial frequency characteristic / Contrast sensitivity / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 118, no. 473, SIS2018-49, pp. 65-70, March 2019. | |
| Paper # | SIS2018-49 | |
| Date of Issue | 2019-02-27 (SIS) | |
| 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 | SIS2018-49 |
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| Conference Information | |
| Committee | SIS |
| Conference Date | 2019-03-06 - 2019-03-07 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Univ. Science, Katsushika Campus |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Soft Computing, etc. |
| Paper Information | |
| Registration To | SIS |
| Conference Code | 2019-03-SIS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Proposal of Image Lightness Conversion and Sharpening Taking Account of Visual Feature of Elderly Person |
| Sub Title (in English) | |
| Keyword(1) | Elderly person |
| Keyword(2) | Tone mapping |
| Keyword(3) | Spatial frequency characteristic |
| Keyword(4) | Contrast sensitivity |
| Keyword(5) | |
| Keyword(6) | |
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| Keyword(8) | |
| 1st Author's Name | Daiki Moriyama |
| 1st Author's Affiliation | Yamaguchi University (Yamaguchi Univ.) |
| 2nd Author's Name | Chiaki Ueda |
| 2nd Author's Affiliation | Okayama University of Science (Okayama Univ. of Science) |
| 3rd Author's Name | Tadahiro Azetsu |
| 3rd Author's Affiliation | Yamaguchi Prefectural University (Yamaguchi Prefectural Univ.) |
| 4th Author's Name | Noriaki Suetake |
| 4th Author's Affiliation | Yamaguchi University (Yamaguchi Univ.) |
| 5th Author's Name | Eiji Uchino |
| 5th Author's Affiliation | Yamaguchi University (Yamaguchi Univ.) |
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| Speaker | Author-1 |
| Date Time | 2019-03-07 11:35:00 |
| Presentation Time | 20 minutes |
| Registration for | SIS |
| Paper # | SIS2018-49 |
| Volume (vol) | vol.118 |
| Number (no) | no.473 |
| Page | pp.65-70 |
| #Pages | 6 |
| Date of Issue | 2019-02-27 (SIS) |
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