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Paper Abstract and Keywords
Presentation 2013-07-11 11:00
A Fixed-Point Tone Mapping Operation for HDR Images Expressd in Floating-Point Data
Toshiyuki Dobashi, Tatsuya Murofushi (Tokyo Metropolitan Univ.), Masahiro Iwahashi (Nagaoka Univ. of Tech.), Hitoshi Kiya (Tokyo Metropolitan Univ.) CAS2013-7 VLD2013-17 SIP2013-37 MSS2013-7
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a tone mapping operation (TMO) with fixed-point arithmetic for high dynamic range (HDR) images expressed in RGBE format.
A TMO generates a low dynamic range (LDR) image from a HDR image by compressing its dynamic range.
In general, it uses floating-point arithmetic because HDR images are floating-point data.
Because of this, it requires huge computational cost even though a resultant LDR image is a integer data.
The proposed method treats a floating-point number as two integer numbers which correspond to a exponent part and a mantissa part.
Moreover, by branching and approximation of some calculations, the method can perform all calculation of a TMO with only fixed-point arithmetic.
Experimental results shows the PSNR of LDR images in the proposed method are comparable to those of the conventional methods.
Keyword (in Japanese) (See Japanese page) 
(in English) tone mapping / high dynamic range / floating-point / fixed-point / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 120, SIP2013-37, pp. 37-41, July 2013.
Paper # SIP2013-37 
Date of Issue 2013-07-04 (CAS, VLD, SIP, MSS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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 CAS2013-7 VLD2013-17 SIP2013-37 MSS2013-7

Conference Information
Committee SIP CAS MSS VLD  
Conference Date 2013-07-11 - 2013-07-12 
Place (in Japanese) (See Japanese page) 
Place (in English) Kumamoto Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) System, signal processing and related topics 
Paper Information
Registration To SIP 
Conference Code 2013-07-SIP-CAS-MSS-VLD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Fixed-Point Tone Mapping Operation for HDR Images Expressd in Floating-Point Data 
Sub Title (in English)  
Keyword(1) tone mapping  
Keyword(2) high dynamic range  
Keyword(3) floating-point  
Keyword(4) fixed-point  
1st Author's Name Toshiyuki Dobashi  
1st Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
2nd Author's Name Tatsuya Murofushi  
2nd Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
3rd Author's Name Masahiro Iwahashi  
3rd Author's Affiliation Nagaoka University of Technology (Nagaoka Univ. of Tech.)
4th Author's Name Hitoshi Kiya  
4th Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
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Date Time 2013-07-11 11:00:00 
Presentation Time 20 minutes 
Registration for SIP 
Paper # CAS2013-7, VLD2013-17, SIP2013-37, MSS2013-7 
Volume (vol) vol.113 
Number (no) no.118(CAS), no.119(VLD), no.120(SIP), no.121(MSS) 
Page pp.37-41 
Date of Issue 2013-07-04 (CAS, VLD, SIP, MSS) 

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