A Region-Oriented Orthogonal Transform Image Coding Scheme for Still Images

Abstract

This paper proposes a new region-oriented coding scheme employing orthogonal transforms. First, an image is partitioned into about 100 regions, some of which are redivided into square-blocks and variable-shape-blocks. Then, a mean value and the AC component in each block are encoded by DPCM and OTC, respectively. This scheme can achieve better coding performance than the JPEG baseline system.