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Paper Abstract and Keywords
Presentation 2026-03-05 13:40
A study of Generating HDR Image's method by Using Smooth Tone Curves
Mizuki Oga, Hiroki Terasaki, Tomoaki Kimura (Kanagawa Institute of Tech.) SIS2025-60
Abstract (in Japanese) (See Japanese page) 
(in English) Compared to human visual characteristics, the dynamic range of a typical camera is relatively narrow. As a result, in scenes with large brightness differences, issues such as crushed blacks and blown highlights occur in captured images. High Dynamic Range (HDR) imaging has been introduced as a technique to address this problem. However, HDR imaging requires capturing multiple images of the same scene with different exposure settings, which can lead to artifacts such as ghosting when the subject or camera moves.To overcome this, methods for generating HDR images from a single image have been proposed. Nevertheless, these approaches often suffer from insufficient global brightness enhancement or the appearance of false contours, limiting improvements in visual quality. In this paper, we propose a method that divides the input image into bright, dark, and intermediate regions, and generates a modified gamma curve for each region such that the derivative values at the boundaries match. These curves are then applied for luminance transformation to suppress the occurrence of false contours. We compare the proposed method with conventional approaches in terms of boundary preservation and brightness adequacy across various images, and confirm that the proposed method produces HDR images with improved visual quality, demonstrating its effectiveness.
Keyword (in Japanese) (See Japanese page) 
(in English) HDR Image / Gamma correction / Tone curves / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 393, SIS2025-60, pp. 16-20, March 2026.
Paper # SIS2025-60 
Date of Issue 2026-02-26 (SIS) 
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 SIS2025-60

Conference Information
Committee SIS  
Conference Date 2026-03-05 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Ohkubo Campus, Saitama University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SIS 
Conference Code 2026-03-SIS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study of Generating HDR Image's method by Using Smooth Tone Curves 
Sub Title (in English)  
Keyword(1) HDR Image  
Keyword(2) Gamma correction  
Keyword(3) Tone curves  
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1st Author's Name Mizuki Oga  
1st Author's Affiliation Kanagawa Institute of Technorogy (Kanagawa Institute of Tech.)
2nd Author's Name Hiroki Terasaki  
2nd Author's Affiliation Kanagawa Institute of Technorogy (Kanagawa Institute of Tech.)
3rd Author's Name Tomoaki Kimura  
3rd Author's Affiliation Kanagawa Institute of Technorogy (Kanagawa Institute of Tech.)
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Speaker Author-3 
Date Time 2026-03-05 13:40:00 
Presentation Time 20 minutes 
Registration for SIS 
Paper # SIS2025-60 
Volume (vol) vol.125 
Number (no) no.393 
Page pp.16-20 
#Pages 5 
Date of Issue 2026-02-26 (SIS) 

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