Geometric-structure-based error concealment with novel applicationsin block-based low-bit-rate coding
Wenjun Zeng; Bede Liu
Circuits and Systems for Video Technology, IEEE Transactions on
Volume 9, Issue 4, Jun 1999 Page(s):648 - 665
Digital Object Identifier 10.1109/76.767129
Summary:This paper first proposes a computationally efficient spatial
directional interpolation scheme, which makes use of the local geometric
information extracted from the surrounding blocks. The proposed
error-concealment scheme produces results that are superior to those of
other approaches, in terms of both peak signal-to-noise ratio and visual
quality. Then a novel approach that incorporates this directional
spatial interpolation at the receiver is proposed for block-based
low-bit-rate coding. The key observation is that the directional spatial
interpolation at the receiver can reconstruct faithfully a large
percentage of the blocks that are intentionally not sent. A
rate-distortion optimal way to drop the blocks is shown. The new
approach can be made compatible with standard JPEG and MPEG decoders.
The block-dropping approach also has an important application for
dynamic rate shaping in transmitting precompressed videos over channels
of dynamic bandwidth. Experimental results show that the proposed coding
and rate-shaping systems can provide significant subjective and
objective gains over conventional approaches
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