Overview of digital facsimile coding techniques in Japan

This paper surveys recent progress in digital facsimile coding techniques in Japan. First, the digital facsimile coding techniques are classified into two major categories: information-preserving coding and non-information-preserving coding. Second, various two-dimensional coding algorithms which fall into the category of information-preserving coding are selected and discussed. Two-dimensional coding is divided into two categories: simultaneous coding of n lines and line-by-line sequential coding. Third, the READ coding scheme, which was proposed by Japan to CCITT SG XIV as the standard of two-dimensional coding, is explained in detail. Fourth, recent developments concerning non-information-preserving coding are explained. Finally, related coding techniques and applications of digital facsimile coding are briefly described.