A Flexible Network Document Imaging Architecture

We have developed a file format which is well-suited for network applications involving images of documents. It is extremely compact and flexible, using the emerging JBIG2 standard and the Mixed Raster Content imaging model. DigiPaper is designed for ease of document storage and interchange: it shares image elements across multiple pages, can be created from a wide range of sources and can be decompressed easily. The data structures within DigiPaper also map well onto page description languages (PDLs) such as PostScript or PDE enabling efficient printing using current printer architectures. We describe some of the algorithms used in DigiPaper for JBIG2 compression of black and white scanned documents.