Joint Bi-level Image Experts Group


The Joint Bi-level Image Experts Group 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, whose official title is Coding of still pictures.
The Joint Bi-level Image Experts Group created the JBIG and JBIG2 standards. The group often meets jointly with the JPEG committee, which typically meets three times annually.
ISO/IEC JTC1 SC29 Working Group 1 is responsible for both JPEG and JBIG standards. It includes two sub-groups: the Joint Photographic Experts Group and the Joint Bi-level Image experts Group.
In the mid-1980s, both CCITT and ISO had standardization groups for image coding: CCITT Study Group VIII and ISO TC97 SC2 WG8. They were historically targeted on image communication. In 1986, it was decided to create the Joint Photographic Expert Group. In 1988, it was decided to create the Joint Bi-level Image Group – JBIG.

Published Standards

JBIG have developed following standards, which were published by ISO/IEC and/or ITU-T:
Common NamePartFirst public release date ISO/IEC NumberITU NumberFormal Title
JBIG11993ITU-T Recommendations , Information technology – Coded representation of picture and audio information – Progressive bi-level image compression
JBIG22000ITU-T Recommendations , Information technology – Lossy/lossless coding of bi-level images

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