ENHANCED JBIG-BASED COMPRESSION FOR SATISFYING OBJECTIVES OF ENGINEERING DOCUMENT MANAGEMENT-SYSTEM

The main objectives of an engineering document management (EDM) system are outlined. Existing image compression algorithms [e.g., Group 4 (G 4) and Joint Bilevel Image Experts Group (JBIG)] offer efficient solut ions to the storage problem but do not sufficiently support other obje ctives such as spatial access and fast decoding. We propose a novel me thod based on JBIG in which the other objectives are also met. The com pression performance of the proposed method is only 10% worse than tha t of JBIG, and at the same time, spatial access to a compressed file i s achieved. The method is also 2.5 times faster in decompression than JBIG. This speedup is comparable to the G4 standard, but with better c ompression performance. The proposed method is applicable not only to engineering drawings but to binary images in any document imaging syst em. (C) 1998 Society of Photo-Optical Instrumentation Engineers. [S009 1-3286(98)02705-6].