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Paper Abstract and Keywords
Presentation 2013-05-17 13:55
Improvement of Gradation Performance for the HDR Image Quantization with less bits
Takeshi Simizu, Naoya Sagara, Kenji Sugiyama (Seikei Univ.) IMQ2013-2
Abstract (in Japanese) (See Japanese page) 
(in English) Usually, HDR (High Dynamic Range) image needs 16 bit for a pixel. It becomes very useful if 8 bit (1 byte) for a pixel is realized. However, to keep a gradation performance, an additional processing such as error diffusion or a dither is required. On the other hand, improvement methods for the gradation performance using a relation with neighbor pixels have been discussed. In this report, the threshold value offset quantization using a dither pattern for the encoding (bit reduction) processing are proposed. Also non-linear spatial filter at decoding (bit reconstruction) is discussed. The luminance images with 8 and 12 bit per pixel are used with 4bit reduction in the experiments. As the results of the experiment, it is recognized that the offset quantization and non-linear filter with optimal parameters gives good gradation and almost 2 dB better PSNR than simple quantization.
Keyword (in Japanese) (See Japanese page) 
(in English) High Dynamic Range Images / Error Diffusion / Offset Quantization / Non-linear Spatial Filter / / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 45, IMQ2013-2, pp. 7-12, May 2013.
Paper # IMQ2013-2 
Date of Issue 2013-05-10 (IMQ) 
ISSN Print edition: ISSN 0913-5685    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 IMQ2013-2

Conference Information
Committee IMQ  
Conference Date 2013-05-17 - 2013-05-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Seikei Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Image Media Quality 
Paper Information
Registration To IMQ 
Conference Code 2013-05-IMQ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improvement of Gradation Performance for the HDR Image Quantization with less bits 
Sub Title (in English)  
Keyword(1) High Dynamic Range Images  
Keyword(2) Error Diffusion  
Keyword(3) Offset Quantization  
Keyword(4) Non-linear Spatial Filter  
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Keyword(6)  
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1st Author's Name Takeshi Simizu  
1st Author's Affiliation Seikei University (Seikei Univ.)
2nd Author's Name Naoya Sagara  
2nd Author's Affiliation Seikei University (Seikei Univ.)
3rd Author's Name Kenji Sugiyama  
3rd Author's Affiliation Seikei University (Seikei Univ.)
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Speaker Author-1 
Date Time 2013-05-17 13:55:00 
Presentation Time 25 minutes 
Registration for IMQ 
Paper # IMQ2013-2 
Volume (vol) vol.113 
Number (no) no.45 
Page pp.7-12 
#Pages 6 
Date of Issue 2013-05-10 (IMQ) 

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