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Decompression Process

IP.com Disclosure Number: IPCOM000064960D
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Hori, S Oka, K [+details]

Abstract

This article describes decompression process wherein each eight-bit group of compressed data is used for accessing an address look-up table, and the addressed entry of the table stores a start address of a routine which sequentially processes the multiple code words contained in the eight-bit group. Image data of a document is compressed by a two-dimensional compression algorithm, i.e., Modified Read Scheme, in which white/black transitions in a scan line are coded in relation to the transitions in a previous scan line, and are classified into the following nine modes. (Image Omitted) An example of compressed data stored in a memory is shown in the figure. Sixteen-bit data of the compressed data is fetched to a 16-bit register.