Temporal Adaptive Vector Quantization For Image Sequence Coding
Claude Labit, Jean-Pierre Marescq · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1987
Vector quantization (Vq) provides us with an appropriate technique to obtain high compression ratios. However, for image sequence coding, vector quantizer has to design temporally stable codebooks of representative vectors and this constraint of temporal stability has to be solved with a minimal computational complexity. We propose a new coding scheme based on visual classification and temporal refreshment procedures which enable to design subjectively optimal codebooks for any kind of real broadcast image sequence. This contribution reports results of simulations about how such a classification may be introduced and evaluated and how vector quantizer may be refreshed. We obtain significantly better reconstruction quality for a given codebook size and investigate several available solutions to implement the codebook refreshment procedures.