Impact of QOS requirements on video coding for ATM networks |
| |
Authors: | Shree Murthy Hari Lalgudi |
| |
Affiliation: | (1) Computer Engineering, University of California, Santa Cruz, CA 95064, USA, US;(2) AT&T Bell Labs, Holmdel, NJ 07733, USA, US |
| |
Abstract: | The broadband integrated services digital networks (B-ISDN) based on asynchronous transfer mode (ATM) technology can support
a wide range of applications such as voice, video, still images, and data. Compression techniques increase the effective bandwidth
utilization, but the bursty and asynchronous nature of the traffic can still lead to congestion in the network, and degradation
of image quality and quality of service (QOS). Some of the features to provide better coding schemes for ATM networks are
layered coding, resynchronization, buffering, interleaved schemes, constrained bit rate due to buffers, encapsulation with
the RTP or AAL1 for clock recovery, lapped transforms, motion compensation, and optimal bit allocation for coders based on
wavelet transforms. We review various techniques forimage and video coding such as transforms, motion compensation, vector
quantization, and subband coding. We outline the impact of the cell loss ratio (CLR), delay and cell delay variation (CDV)
on video coding: blocking effects, loss of frame synchronization, motion vectors, and vector quantization codewords. The open
problems include tuning coding parameters to the available QOS provided by the network. |
| |
Keywords: | :Video coding techniques – Video coding standards – Transform coding – ATM networks – Quality of service and CLR CDV delay |
本文献已被 SpringerLink 等数据库收录! |
|