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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 23, No. 40 >

リーク予測による異種DCTフレーム間符号化方式の整合化


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Title: リーク予測による異種DCTフレーム間符号化方式の整合化
Other Titles: Trying to match up interframe coding and decoding using different DCT algorithms by leaky prediction
Authors: 黒田, 英夫 / 藤村, 誠 / 下田, 裕 / マワンサ, デニス シレッシュ
Authors (alternative): Kuroda, Hideo / Fujimura, Makoto / Shimoda, Yutaka / Mwansa, Dennis Chileshe
Issue Date: Jan-1993
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, 23(40), pp.41-48; 1993
Abstract: In the international standard video coding specification H. 261 for videophone systems. DCT (Discrete Cosine Transform) is used for the interframe difference signals. If the used DCT algorithms are different each other, FDCT-IDCT mismatch may occur and cause the introduction of mismatch noise in the frame memorys of sender and reciever. The leaky prediction is useful for removing the mismatch noise although it causes decreasing of insignificant blocks or deteriorating of picture quality on static area. In this paper, the leaky interframe prediction coding system is proposed. The system however prevents insignificant blocks decreasing by raising up the threshold value to decide between insignificant block and significant block. Moreover, by dividing the decoded signals by leaky prediction coefficient, the decoded picture quality is improved for displaying.
URI: http://hdl.handle.net/10069/24392
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 23, No. 40

Citable URI : http://hdl.handle.net/10069/24392

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