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Paper Abstract and Keywords
Presentation 2014-02-17 10:20
Relaxation of Restriction on HDR Image Formats for A Fixed-Point Tone Mapping Operation
Atsushi Tashiro (Tokyo Metropolitan Univ), Tatsuya Murofushi, Toshiyuki Dobashi (Tokyo Metropolitan Univ.), Masahiro Iwahashi (Nagaoka Univ. of Tech.), Hitoshi Kiya (Tokyo Metropolitan Univ.) ITS2013-34 IE2013-99
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes an integer tone mapping operation (TMO) with fixed-point arithmetic
for high dynamic range (HDR) images expressed in floating-point data.
A TMO generates a low dynamic range (LDR) image from HDR image by compressing its dynamic range.
In general, it uses floating-point arithmetic because values of HDR images are expressed in floating-point data.
For this, it requires huge computational costs, even though LDR images are expressed in integer data.
The method with fixed-point arithmetic
and integer processing in which a floating-point number is divided into the exponent and the mantissa
was proposed.
However, in the previous research, HDR image formats are restricted,
so it is difficult to apply integer processing to HDR images having various formats.
By using an intermediate format, the proposed TMO is available for any HDR images.

The results show reducing the computational cost while maintaining the numerical accuracy.
Keyword (in Japanese) (See Japanese page) 
(in English) tone mapping / high dynamic range / fixed-point arithmetic / floating-point data / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 434, IE2013-99, pp. 25-30, Feb. 2014.
Paper # IE2013-99 
Date of Issue 2014-02-10 (ITS, IE) 
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 ITS2013-34 IE2013-99

Conference Information
Conference Date 2014-02-17 - 2014-02-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ITS Image Processing, etc. 
Paper Information
Registration To IE 
Conference Code 2014-02-ITS-IE-AIT-HI-ME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Relaxation of Restriction on HDR Image Formats for A Fixed-Point Tone Mapping Operation 
Sub Title (in English)  
Keyword(1) tone mapping  
Keyword(2) high dynamic range  
Keyword(3) fixed-point arithmetic  
Keyword(4) floating-point data  
1st Author's Name Atsushi Tashiro  
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 Toshiyuki Dobashi  
3rd Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
4th Author's Name Masahiro Iwahashi  
4th Author's Affiliation Nagaoka Univercity of Technology (Nagaoka Univ. of Tech.)
5th Author's Name Hitoshi Kiya  
5th Author's Affiliation Tokyo Metropolitan University (Tokyo Metropolitan Univ.)
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Speaker Author-1 
Date Time 2014-02-17 10:20:00 
Presentation Time 15 minutes 
Registration for IE 
Paper # ITS2013-34, IE2013-99 
Volume (vol) vol.113 
Number (no) no.433(ITS), no.434(IE) 
Page pp.25-30 
Date of Issue 2014-02-10 (ITS, IE) 

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