ITU-T Recommendations

Rec. ITU-T T.800 | ISO/IEC 15444-1 defines a set of lossless and lossy compression methods for coding continuous-tone,
bi-level, greyscale or colour digital still images. This Recommendation | International Standard provides three
independently created software reference implementations of Rec. ITU-T T.800 | ISO/IEC 15444-1, in order to assist
implementers of Rec. ITU-T T.800 | ISO/IEC 15444-1 in testing and understanding its content. The packages are JASPER,
JJ2000 and OPENJPEG.

This Recommendation | International Standard also provides an independently created software reference implementation
of Rec. ITU-T T.814 | ISO/IEC 15444-15, which specifies a high-throughput (HT) block coding algorithm that can be used
in place of the block coding algorithm of Rec. ITU-T T.800 | ISO/IEC 15444-1, in order to assist implementers of
Rec. ITU-T T.814 | ISO/IEC 15444-15 in testing and understanding its content. The package is TT.
This Recommendation | International Standard additionally provides an independently created software reference
implementation for parsing of a JP2 file format specified in Rec. ITU-T T.800 | ISO/IEC 15444-1 and a JPH file format
specified in Rec. ITU-T T.814 | ISO/IEC 15444-15, The package is Codestream-parser.

This Recommendation | International Standard does not define any additional part of the JPEG 2000 image coding system.
The reference software is intended for use as a testing and validation tool for other implementations of JPEG 2000, and to
help in the understanding of Rec. ITU-T T.800 | ISO/IEC 15444-1 and Rec. ITU-T T.814 | ISO/IEC 15444-15. Although
components of the reference software may find application in software intended for product development, this was not an
objective of the development of this software, and prospective implementers are cautioned against making any estimations
of performance or resource usage based on the reference software.