<title>Low-bit-rate compression using recursive block coding techniques</title>

Abstract

The hybrid JPEG/recursive block coding (JPEG/RBC) algorithm introduced in [1] considerably reduces the tile effect and produces visually pleasing images. This paper proposes its use in low bit rate image coding and presents a quantization matrix (QM) design for the DST blocks that can be used for a wide range of low DST bit rates. The data rate optimization problem encountered in the JPEG/RBC algorithm is discussed and an empirical ratio of the bit rates for the DCT and the DST blocks is obtained for low bit rate image coding. Subjective evaluation [2] of images coded at low bit rates placed JPEG/RBC in the top group of three algorithms among those submitted for possible inclusion as the next generation bandwidth compression (BWC) algorithm in the National Imagery Transmission Format Standard (NITFS).