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Paper Abstract and Keywords
Presentation 2014-12-20 15:45
Relationship of Subjective Quality between Quantization Parameter and Viewing Distance on Image Coding
Ayumu Ohike, Naoyuki Awano, Kenji Sugiyama (Seikei Univ.) IMQ2014-21
Abstract (in Japanese) (See Japanese page) 
(in English) Very high-resolution video systems, such as 4K, enable a very close viewing distance. This technology enables high-reality systems in homes to be realized. However, the very short distance causes significantly different views across the picture, and uniform processing for the picture may not always be the best choice. Here, we calculate the actual view size of a pixel, which depends on the pixel position in close viewing. We have proposed the two kinds of perceptual coding methods. First one is a pre-filtering which depend on the size of a pixel. Another one is a quantization control by a contrast change. However, the control of quantization should be decided based on the perceptual performance between pixel size and quantization. Therefore, we carried out subjective assessment about this. The bit rate reduction is checked for each methods. As the results of this experiments, it is recognized that up to 15% of bit rate reduction is achievable.
Keyword (in Japanese) (See Japanese page) 
(in English) High Reality Video System / Super Close Viewing / Quantization Control / Subjective Quality Assessment / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 386, IMQ2014-21, pp. 29-32, Dec. 2014.
Paper # IMQ2014-21 
Date of Issue 2014-12-13 (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 IMQ2014-21

Conference Information
Committee IMQ  
Conference Date 2014-12-20 - 2014-12-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagoya University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Medical Imaging and Image Media Quality 
Paper Information
Registration To IMQ 
Conference Code 2014-12-IMQ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Relationship of Subjective Quality between Quantization Parameter and Viewing Distance on Image Coding 
Sub Title (in English)  
Keyword(1) High Reality Video System  
Keyword(2) Super Close Viewing  
Keyword(3) Quantization Control  
Keyword(4) Subjective Quality Assessment  
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Keyword(6)  
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Keyword(8)  
1st Author's Name Ayumu Ohike  
1st Author's Affiliation Seikei University (Seikei Univ.)
2nd Author's Name Naoyuki Awano  
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 2014-12-20 15:45:00 
Presentation Time 25 minutes 
Registration for IMQ 
Paper # IMQ2014-21 
Volume (vol) vol.114 
Number (no) no.386 
Page pp.29-32 
#Pages 4 
Date of Issue 2014-12-13 (IMQ) 

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