Till Halbach and Thomas R. Fischer.
SNR Scalability by Transform Coefficient Refinement for
Block-Based Video Coding.
in Proc. Visual Communications and Image Processing Conference (VCIP),
Lugano (Switzerland),
July 2003
Abstract
Various techniques for SNR scalability in hybrid block-based video coding exist in
the literature and in different standards.
A new approach based on transform coefficient refinement is proposed in this
article.
The coefficient difference is computed after quantization, subsequently entropy-encoded,
and transmitted for reconstruction of a high-quality layer at the
decoder.
The approach achieves in most cases only a moderate increase in bit rate as compared to
other schemes.
The bit rate of our two-layer framework converges towards the rate of a single-layer
system as the quality difference between the two layers
increase.
The gains come at the cost of increased computational complexity and memory
requirements.
Keywords
SNR quality scalability, block-based hybrid video coding, bit stream layering,
H.26L.
Till Halbach
Last modified: January 30, 2002
