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:
– JASPER
– JJ2000
– OPENJPEG
The three reference software packages are informative only. This Recommendation | International Standard does not define any additional part of the JPEG 2000 image coding system.
Each version of the reference software contains source code, which may be compiled to provide the following functionality:
– transcoding from selected, widely available image formats into a JPEG 2000 codestream;
– transcoding from selected, widely available image formats into the JP2 file format;
– selection of a wide range of JPEG 2000 encoding options (as documented in each reference software);
– decoding from a JPEG 2000 codestream to a range of selected widely available image formats;
– partial processing of a JP2 file to extract a JPEG 2000 codestream for decoding to a range of selected widely available image formats (not included in the reference software);
– some additional tools to help with evaluation and testing.
The reference software packages are 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. 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.
This new edition integrates the contents of Rec. ITU-T T.804 (2002) | ISO/IEC 15444-5:2003, its Amendment 1 (2014) | Amd.1:2003 and its Amendment 2 (2015) | Amd.2:2015.