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Paper Abstract and Keywords
Presentation 2007-09-27 13:25
On bitrate and buffer control for MOS-based video coding
Junichi Yamagata, Shinichi Tanaka, Toshiyuki Yoshida (Univ. of Fukui) CQ2007-44 OIS2007-34 IE2007-41
Abstract (in Japanese) (See Japanese page) 
(in English) To obtain the highest possible video quality in a video transmission over a bandlimited network, the authors have proposed a coding technique which maximizes the estimated spatio-temporal MOS by adaptively controling the number of frames per second and the average amount of bits for a single frame under a constant bit rate. The technique has the advantage that it can give an estimation of the MOS for each scene of a target video. This paper has tried to evaluate the variations of the MOS by encoding several video sequences with a length of a few minutes by the proposed technique, and calculated the ratio of the scenes having very low MOSs. The ratio has been proved to be several percents in general. Then, we have tried to improve the video quality for such scenes, or to equalize the video quality in an entire sequence by introducing a sort of buffer control with frame prescanning. It is shown that the lowest video quality in a sequence can be improved by increasing the number of prescanning frames under the condition that
the total amount of bits is kept constant.
Keyword (in Japanese) (See Japanese page) 
(in English) video coding / subjective assessment score / MOS / rate control / buffer control / video quality improvement / /  
Reference Info. IEICE Tech. Rep., vol. 107, pp. 43-49, Sept. 2007.
Paper #  
Date of Issue 2007-09-20 (CQ, OIS, IE) 
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 CQ2007-44 OIS2007-34 IE2007-41

Conference Information
Committee CQ LOIS IE IEE-CMN ITE-ME  
Conference Date 2007-09-27 - 2007-09-28 
Place (in Japanese) (See Japanese page) 
Place (in English) The university of Tokushima 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Multimedia communication, multimedia system, IP broadcast/video transmission, etc 
Paper Information
Registration To ITE-ME 
Conference Code 2007-09-CQ-OIS-IE-IEE-CMN-ITE-ME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) On bitrate and buffer control for MOS-based video coding 
Sub Title (in English)  
Keyword(1) video coding  
Keyword(2) subjective assessment score  
Keyword(3) MOS  
Keyword(4) rate control  
Keyword(5) buffer control  
Keyword(6) video quality improvement  
Keyword(7)  
Keyword(8)  
1st Author's Name Junichi Yamagata  
1st Author's Affiliation University of Fukui (Univ. of Fukui)
2nd Author's Name Shinichi Tanaka  
2nd Author's Affiliation University of Fukui (Univ. of Fukui)
3rd Author's Name Toshiyuki Yoshida  
3rd Author's Affiliation University of Fukui (Univ. of Fukui)
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Speaker Author-1 
Date Time 2007-09-27 13:25:00 
Presentation Time 25 minutes 
Registration for ITE-ME 
Paper # CQ2007-44, OIS2007-34, IE2007-41 
Volume (vol) vol.107 
Number (no) no.229(CQ), no.230(OIS), no.231(IE) 
Page pp.43-49 
#Pages 7 
Date of Issue 2007-09-20 (CQ, OIS, IE) 

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