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Paper Abstract and Keywords
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
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

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) 
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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  
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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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