Joint Bi-level Image Experts Group

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The Joint Bi-level Image Experts Group (JBIG) is a group of experts nominated by national standards bodies and major companies to work to produce standards for bi-level image coding. The "joint" refers to its status as a committee working on both ISO and ITU-T standards. It is one of two sub-groups of ISO/IEC Joint Technical Committee 1, Subcommittee 29, Working Group 1 (ISO/IEC JTC 1/SC 29/WG 1), whose official title is Coding of still pictures.[1][2][3]

The Joint Bi-level Image Experts Group created the JBIG and JBIG2 standards.[4] The group often meets jointly with the JPEG committee, which typically meets three times annually.[5]

ISO/IEC JTC1 SC29 Working Group 1 (working together with ITU-T Study Group 16 – VCEG[6] and previously also with Study Group 8 – SG8[7][8][9]) is responsible for both JPEG and JBIG standards.[10] It includes two sub-groups: the Joint Photographic Experts Group (JPEG SG) and the Joint Bi-level Image experts Group (JBIG SG).[4][1]

In the mid-1980s, both CCITT (now ITU-T) and ISO had standardization groups for image coding: CCITT Study Group (SG) VIII (Telematic Services) and ISO TC97 SC2 WG8 (Coding of Audio and Picture Information).[11] They were historically targeted on image communication. In 1986, it was decided to create the Joint (CCITT/ISO) Photographic Expert Group. In 1988, it was decided to create the Joint (CCITT/ISO) Bi-level Image Group – JBIG.[12][11]

Published Standards[edit]

JBIG have developed following standards, which were published by ISO/IEC and/or ITU-T:

Joint Photographic Experts Group - developed standards[2][13]
Common Name Part First public release date (First edition) ISO/IEC Number ITU Number Formal Title
JBIG1 1993 ISO/IEC 11544 ITU-T Recommendations T.82, T.85 Information technology – Coded representation of picture and audio information – Progressive bi-level image compression
JBIG2 2000 ISO/IEC 14492 ITU-T Recommendations T.88, T.89 Information technology – Lossy/lossless coding of bi-level images

Note: The published JBIG2 standard was revised by later amendments.

See also[edit]


  1. ^ a b ISO/IEC JTC 1/SC 29 (2009-05-07). "ISO/IEC JTC 1/SC 29/WG 1 - Coding of Still Pictures (SC 29/WG 1 Structure)". Retrieved 2009-11-11. 
  2. ^ a b ISO/IEC JTC 1/SC 29. "Programme of Work, (Allocated to SC 29/WG 1)". Archived from the original on 2013-12-31. Retrieved 2009-11-07. 
  3. ^ ISO. "JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information". Retrieved 2009-11-11. 
  4. ^ a b JPEG, JBIG (2007). "About our committee". Retrieved 2009-11-11. 
  5. ^ JPEG. "How does JPEG work?". Retrieved 2009-11-09. 
  6. ^ "ITU-T Home : Study Groups : Study Group 16 - Question 6/16 – Visual coding". Retrieved 2010-03-07. 
  7. ^ JBIG Committee (1999-07-16), ISO/IEC JTC 1/SC 29/WG 1 (ITU-T SG8) - 14492 FCD (PDF),, archived from the original (PDF) on 2010-06-12, retrieved 2010-03-07 
  8. ^ ITU-T, ITU-T Study Group 8 List of Questions under Study (Study Period 1997 - 2000) (DOC), retrieved 2010-03-07 
  9. ^ ITU-T. "ITU-T Study Group 8 (Study Period 1997-2000)". Retrieved 2010-03-07. 
  10. ^ JPEG. "Joint Photographic Experts Group, JBIG Homepage". Retrieved 2009-11-08. 
  11. ^ a b (2009-09-06). "Riding the Media Bits, The Faultline". Archived from the original on 2011-01-22. Retrieved 2010-02-09. 
  12. ^ ITU-T (2005-07-21), The First Joint ITU ISO/IEC StillImage Compression Standards (PDF), p. 3, retrieved 2009-11-12 
  13. ^ ISO. "JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information". Retrieved 2009-11-07. 

External links[edit]