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Summary: A TWO-STAGE MULTIPLE DESCRIPTION VIDEO CODER WITH DRIFT-PREVENTING
MOTION COMPENSATED PREDICTION
Yen-Chi Lee, Yucel Altunbasak, and Russell M. Mersereau
Center for Signal and Image Processing
Georgia Institute of Technology
Atlanta, GA, 30332-0250
E-mail: yenchi, yucel, rmm @ece.gatech.edu
ABSTRACT
In this paper, we propose a very simple, but efficient two-stage
MDC in the central prediction loop based on Reibman's three-
prediction-loop structure [7]. In our design, an additional multiple
description scalar quantizer (MDSQ) is introduced into the central
prediction loop. The encoding of the side information is modified
in such a way that it can be used to improve the video quality when
no drift occurs, but still maintain drift prevention capability. The
simulation results with different video sequences at various packet
loss rates demonstrate that the proposed two-stage MDC structure
indeed enhances the quality by about 0.25 dB when the channel
is error-free, yet effectively avoids drift when one description is
completely lost.
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