Page 161 - ITU Journal, ICT Discoveries, Volume 3, No. 1, June 2020 Special issue: The future of video and immersive media

ITU Journal: ICT Discoveries, Vol. 3(1), June 2020

3. JPEG AND THE INDEPENDENT JPEG GROUP CONTACTS
While the requirements came from CCITT and ISO, the JPEG group worked autonomously. The specification
created by the group (JPEG-8) was introduced to both SDOs and they were independently approved in parallel
by both ITU-T SG8 and ISO/IEC JTC1 SC29, as ITU-T T.81 (1992)| ISO/IEC 10918-1:1994 [1].
The reason for the long time lag between the technically stable JPEG-8 and JPEG-9 specifications and the finally
approved and published ITU and ISO/IEC JTC1 standards was that:
• the JPEG specification format had to be adapted to the new common ITU/ISO/IEC standard format
(ITU-T T.81 was one of the first standards using the common text format);
• the formal SDO approval and publication procedures on the ISO/IEC side take too much time.

The JPEG-8 specification was a stable document from about the fall of 1990 (Fig. 13). That was also the time
when JPEG passed the specifications to CCITT and JTC1 to start their approval procedures (e.g. the JTC1
committee draft (CD) was registered in April 1990 with the draft technical specification JPEG-8 revision 5 and
in August 1990 revision 8 [12]).
JPEG-8 was also the specification ready for early implementations and testing. Via the relationship of JPEG to
the parent SDOs, the drafts were available both to the ITU-T membership (CCITT SGVIII) and to ISO/IEC JTC1
member bodies.

© International Telecommunication Union, 2020 139