Lightweight Image Codec via Multi-Grid Multi-Block-Size Vector Quantization (MGBVQ). (arXiv:2209.12139v1 [cs.CV])

A multi-grid multi-block-size vector quantization (MGBVQ) method is proposed
for image coding in this work. The fundamental idea of image coding is to
remove correlations among pixels before quantization and entropy coding, e.g.,
the discrete cosine transform (DCT) and intra predictions, adopted by modern
image coding standards. We present a new method to remove pixel correlations.
First, by decomposing correlations into long- and short-range correlations, we
represent long-range correlations in coarser grids due to their smoothness,
thus leading to a …

arxiv codec image quantization vector