Mode dependent vector quantization with a rate-distortion optimized codebook for residue coding in video compression
Résumé
The High Efficiency Video Coding standard (HEVC) supports
a total of 35 intra prediction modes which aim at reducing
spatial redundancy by exploiting pixel correlation within a local
neighborhood. In this paper, we show that spatial correlation
remains after intra prediction, leading to high energy
prediction residues. We propose a novel scheme for encoding
the prediction residues using a Mode Dependent Vector Quantization
(MDVQ) which aims at reducing the redundancy in
residual domain. The MDVQ codebook is optimized in a
rate-distortion (RD) sense. Experimental results show that
the codebook can be independent of the quantization parameter
(QP) with no loss in terms of coding efficiency. A bitrate
reduction of 1:1% on average compared to HEVC can
be achieved, while further tests indicate that codebook adaptivity
could substantially improve the performance
Origine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...