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| Presentation | 2020-03-16 14:55 Joint Estimation of Illumination Distribution and Response Function from Shadows Takuto Nakashima, Ryo Matsuoka, Takahiro Okabe (Kyutech)  PRMU2019-77 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | We estimate the illumination distribution of a scene from a single image. Conventional methods assume that the radiometric response function of a camera is linear or that the scene is convex and has no cast shadow. However, since the response function of a consumer camera is nonlinear, the conventional methods cannot be applied to images on the Internet. Furthermore, the high-frequency components of the illumination distribution cannot be estimated from the image of a convex Lambertian scene without cast shadows. Therefore, we jointly estimate the illumination distribution and radiometric response function based on cast shadows. Specifically, we use Haar wavelets for representing an illumination distribution and perform sparse optimization. Furthermore, we show that by applying a mask to the edge region, robust estimation from approximate shapes in the real image is possible. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Inverse lighting / cast shadows / radiometric response function / Haar wavelets / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 119, no. 481, PRMU2019-77, pp. 65-70, March 2020. | |
| Paper # | PRMU2019-77 | |
| Date of Issue | 2020-03-09 (PRMU) | |
| ISSN | 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 | PRMU2019-77 |
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| Conference Information | |
| Committee | PRMU IPSJ-CVIM |
| Conference Date | 2020-03-16 - 2020-03-17 |
| 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 | 2020-03-PRMU-CVIM |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Joint Estimation of Illumination Distribution and Response Function from Shadows |
| Sub Title (in English) | |
| Keyword(1) | Inverse lighting |
| Keyword(2) | cast shadows |
| Keyword(3) | radiometric response function |
| Keyword(4) | Haar wavelets |
| Keyword(5) | |
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| Keyword(8) | |
| 1st Author's Name | Takuto Nakashima |
| 1st Author's Affiliation | Kyushu Institute of Technology (Kyutech) |
| 2nd Author's Name | Ryo Matsuoka |
| 2nd Author's Affiliation | Kyushu Institute of Technology (Kyutech) |
| 3rd Author's Name | Takahiro Okabe |
| 3rd Author's Affiliation | Kyushu Institute of Technology (Kyutech) |
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| Speaker | Author-1 |
| Date Time | 2020-03-16 14:55:00 |
| Presentation Time | 15 minutes |
| Registration for | PRMU |
| Paper # | PRMU2019-77 |
| Volume (vol) | vol.119 |
| Number (no) | no.481 |
| Page | pp.65-70 |
| #Pages | 6 |
| Date of Issue | 2020-03-09 (PRMU) |
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