Video coding with optimal inter/intra-mode switching for packetloss resilience
Zhang, R.; Regunathan, S.L.; Rose, K.
Selected Areas in Communications, IEEE Journal on
Volume 18, Issue 6, Jun 2000 Page(s):966 - 976
Digital Object Identifier 10.1109/49.848250
Summary:Resilience to packet loss is a critical requirement in predictive
video coding for transmission over packet-switched networks, since the
prediction loop propagates errors and causes substantial degradation in
video quality. This work proposes an algorithm to optimally estimate the
overall distortion of decoder frame reconstruction due to quantization,
error propagation, and error concealment. The method recursively
computes the total decoder distortion at pixel level precision to
accurately account for spatial and temporal error propagation. The
accuracy of the estimate is demonstrated via simulation results. The
estimate is integrated into a rate-distortion (RD)-based framework for
optimal switching between intra-coding and inter-coding modes per
macroblock. The cost in computational complexity is modest. The
framework is further extended to optimally exploit
feedback/acknowledgment information from the receiver/network.
Simulation results both with and without a feedback channel demonstrate
that precise distortion estimation enables the coder to achieve
substantial and consistent gains in PSNR over known state-of-the-art RD-
and non-RD-based mode switching methods
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