Current compression ratio for still pictures and performance enhancement by preprocessing

Abstract

In lossless encoding, a JBIG(Joint Binary Image Group) encoding algorithm has been standardized internationally for an image data, based on adaptive bi-level arithmetic encoding. LHa, based on Lempel-Ziv encoding algorithm, has been widely used in PC environment, and has a great compression efficiency. In this paper, first of all, I will overview a current and future application of compression technology and algorithms of JBIG and Lempel-Ziv encoding and introduce its compression ratio. Next, we will make a brief report of performance enhancement by edge conversion, under research and development, as a pre-process of these algorithms.