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Paper Abstract and Keywords
Presentation 2017-09-05 15:00
Color group constraint for image smoothing
Riku Mikami, Taichi Yoshida, Masahiro Iwahashi (Nagaoka Univ. of Tech.) LOIS2017-25 IE2017-46 EMM2017-54
Abstract (in Japanese) (See Japanese page) 
(in English) $L_0$ gradient minimization is a technique that belongs to edge-preserving image smoothing. The objective function of $L_0$ gradient minimization consists of the quadratic data-fidelity and the $L_0$ gradient, which calculates the number of the non-zero gradients of an image, and various methods which approximately minimize it have been proposed. $L_0$ gradient minimization is a powerful tool as edge-preserving image smoothing, but it has an inherent difficulty. Since the free parameter controlling the degree of flatness does not have a physical meaning, its setting is troublesome. To avoid the troublesome work, we propose a method of edge-preserving image smoothing based on the number of color group constraint in this report. We define the color group as a set of pixels which have same pixel values and neighbor each other. The proposed method is strongly related with $L_0$ gradient minimization. Because, since a value of $L_0$ gradient is zero inside a color group, the number of color groups is linearly in proportion to $L_0$ gradient. The proposed method formulates the number of color groups as the control parameter, and the parameter visually has a physical meaning. Through simulations, results of the proposed method is enough smoothed images with preserved edges, compared with state-of-the-art methods of $L_0$ gradient minimization.
Keyword (in Japanese) (See Japanese page) 
(in English) Edge-preserving image smoothing / $L_0$ gradient minimization / optimization / / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 200, IE2017-46, pp. 87-90, Sept. 2017.
Paper # IE2017-46 
Date of Issue 2017-08-28 (LOIS, IE, EMM) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 LOIS2017-25 IE2017-46 EMM2017-54

Conference Information
Committee EMM IE LOIS IEE-CMN ITE-ME  
Conference Date 2017-09-04 - 2017-09-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto Univ. (Clock Tower Centennial Hall) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Multimedia Communication/System, Lifelog Applications, IP Broadcasting/Video Transmission, Media Security, etc. 
Paper Information
Registration To IE 
Conference Code 2017-09-EMM-IE-LOIS-CMN-ME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Color group constraint for image smoothing 
Sub Title (in English)  
Keyword(1) Edge-preserving image smoothing  
Keyword(2) $L_0$ gradient minimization  
Keyword(3) optimization  
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1st Author's Name Riku Mikami  
1st Author's Affiliation Nagaoka University of Technology (Nagaoka Univ. of Tech.)
2nd Author's Name Taichi Yoshida  
2nd Author's Affiliation Nagaoka University of Technology (Nagaoka Univ. of Tech.)
3rd Author's Name Masahiro Iwahashi  
3rd Author's Affiliation Nagaoka University of Technology (Nagaoka Univ. of Tech.)
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Speaker Author-1 
Date Time 2017-09-05 15:00:00 
Presentation Time 25 minutes 
Registration for IE 
Paper # LOIS2017-25, IE2017-46, EMM2017-54 
Volume (vol) vol.117 
Number (no) no.199(LOIS), no.200(IE), no.201(EMM) 
Page pp.87-90 
#Pages
Date of Issue 2017-08-28 (LOIS, IE, EMM) 


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