JBIG2 Compression Summary
JBIG2 compression can make a tremendous difference in a company’s ability to effectively transmit, process, web-host, and email scanned documents. A compression factor of 5x-10x can typically be expected. When JBIG2 is mapped to PDF format, there are some additional advantages over storing image documents in TIFF format, like a searchable text layer, web-optimization, and security. For JBIG2 conversion to be reliable, the quality of the JBIG2 encoder is paramount. Any reliable JBIG2 encoder must support perceptually lossless image conversion.
JBIG2 Implementation Factors
Not specifying the encoding method for JBIG2 means there is considerable latitude for a JBIG2 design & implementation team to qualitatively differentiate one JBIG2 encoder from another. Among the differentiating factors in a JBIG2 implementation are:
- Compressed File Zize
- Image Quality
- Supported JBIG2 Modes
- Speed of the Encoder & Decoder
- Speed to Display a Page in a File
- Speed to Print a File
JBIG2 specifications provide a framework which enables great compression savings when used properly. The best manner to take advantage of it is an area of ongoing research. As a result, the difference in file size between different JBIG2 implementations can vary drastically.
Selecting the right JBIG2 software, then, is crucial to truly optimize the possibilities of the format. Any business wishing to maximize the advantages of compression through speed, accuracy, and image quality is well served to go through due diligence to choose the software best suited to its specific objectives for JBIG2 implementation.
CVISION Technologies. "Case Studies." 2004, 2005. www.cvisiontech.com is the place to read the Primer case studies in more detail, and to find more real-life, real time success stories.
CVISION Technologies. "ImageAccel®: Image 2PDF Compressor." Slide presentation, 2004. Short, sweet summary of transmission time savings and compression ratios available with CVISION technology, here presented as a cooperative product with Captiva.
Gross, Ari. "Capture, Conversion & Compression to PDF: Best Practices and Pitfalls." Slide presentation, 2005. Exactly what the title says: an overview of best practices (and potential hazards) in PDF capture, conversion and compression.
Gross, Ari "Understanding the New Standard for Compression of Captured Bitonal Documents." Unpublished paper, 2005. This internal CVISION document is the basis of the business advantage and application rationale for JBIG2 used in the Primer.
JBIG Committee. Information Technology - Coded Representation of Picture and Audio Information - Lossy/Lossless Coding of Bi-Level Images (14492 FCD), http://www.jpeg.org/public/fcd14492.pdf. July 16, 1999. This is the final technical specification of the JBIG2 standard.
Sellen, Abigail J., and Harper, Richard H.R. The Myth of the Paperless Office. Cambridge: The MIT Press, November 2001. A leading treatise on why paper use and office work will go hand-in-hand for some time to come.
Tompkins, David Andrew Douglas. "Rate Control in Bi-Level Image Coding." Master's thesis, University of British Columbia, 2000. Excellent overview onJBIG2, used extensively as a reference for this Primer.