Author: Lai, Wing-cheung
Title: Cell loss concealment coding for ATM video
Degree: M.Sc.
Year: 1996
Subject: Asynchronous transfer mode
Video compression
Coding theory
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vii, 71 leaves : ill. ; 30 cm
Language: English
Abstract: Loss of video cells in Asynchronous Transfer Mode (ATM) network causes degradation on video quality. Among cell loss concealment methods, the two-layer video coding method matches the priority scheme in the ATM architecture and compatible with video codec available in the existing market. In this report, a two-layer H.261 video coding method is proposed to alleviate cell loss effect on video transmission over ATM network. Two layers of data are produced by the coder according to their importance. The first layer contains important data including coding information, dc component and low frequent coefficients and are transmitted via a guaranteed channel. The second layer consists of less important data including high frequent coefficients and are transmitted via a lossy channel. Pictures are reconstructed based on the first layer data whereas the second layer data is for quality enhancement. Models of layering, packetization, cell loss and burstiness are defined. By the simulation, the performance of the two-layer H.261 video codec is evaluated in terms of the bit rate requirement, picture quality, cost analysis, cell loss ratio and burst length.
Rights: All rights reserved
Access: restricted access

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