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Paper Abstract and Keywords
Presentation 2018-02-16 11:00
Image contrast enhancement based on noise aware shadow-up function
Chiencheng Chien, Yuma Kinoshita, Sayaka Shiota, Hitoshi Kiya (Tokyo Metro. Univ.) ITS2017-81 IE2017-113
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a novel image contrast enhancement method based on a noise aware shadow-up
function. Images taken by digital cameras have low contrast in dark or bright regions. This is due to a limited
dynamic range which imaging sensors have. For this reason, various contrast enhancement methods have so far been
proposed. However, conventional enhancement methods cause the loss of details in bright regions due to over-en-
hancement of contrast. In addition, most of conventional methods amplify noise in dark regions because they do not
consider noise included images. The proposed method can enhance the image contrast without over-enhancement
and noise amplification. In the proposed method, a shadow-up function is used for preventing over-enhancement
and the loss of details in bright regions. In addition, a mapping function designed by using a noise aware histogram
allows not only to enhance contrast of dark region, but also to avoid amplifying noise. Experimental results show
the effectiveness of the proposed method by comparing the proposed ones with conventional ones.
Keyword (in Japanese) (See Japanese page) 
(in English) Contrast enhancement / Image enhancement / Noise aware / Shadow-up function / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 432, IE2017-113, pp. 245-250, Feb. 2018.
Paper # IE2017-113 
Date of Issue 2018-02-08 (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 ITS2017-81 IE2017-113

Conference Information
Conference Date 2018-02-15 - 2018-02-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Image Processing, etc. 
Paper Information
Registration To IE 
Conference Code 2018-02-ITS-IE-MMS-HI-ME-AIT 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Image contrast enhancement based on noise aware shadow-up function 
Sub Title (in English)  
Keyword(1) Contrast enhancement  
Keyword(2) Image enhancement  
Keyword(3) Noise aware  
Keyword(4) Shadow-up function  
1st Author's Name Chiencheng Chien  
1st Author's Affiliation Tokyo Metropolitan University (Tokyo Metro. Univ.)
2nd Author's Name Yuma Kinoshita  
2nd Author's Affiliation Tokyo Metropolitan University (Tokyo Metro. Univ.)
3rd Author's Name Sayaka Shiota  
3rd Author's Affiliation Tokyo Metropolitan University (Tokyo Metro. Univ.)
4th Author's Name Hitoshi Kiya  
4th Author's Affiliation Tokyo Metropolitan University (Tokyo Metro. Univ.)
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Speaker Author-1 
Date Time 2018-02-16 11:00:00 
Presentation Time 15 minutes 
Registration for IE 
Paper # ITS2017-81, IE2017-113 
Volume (vol) vol.117 
Number (no) no.431(ITS), no.432(IE) 
Page pp.245-250 
Date of Issue 2018-02-08 (ITS, IE) 

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