scope:

This Recommendation | International Standard was developed by the Joint Photographic Experts Group (JPEG), the joint ISO/I-TU committee responsible for developing standards for continuous-tone still picture coding. It also refers to the Recommendations | International Standards produced by this committee: ITU-T Rec. T.81 | ISO/IEC 10918-1, ITU-T Rec. T.83 | ISO/IEC 10918-2, ITU-T Rec. T.84 | ISO/IEC 10918-3 and ITU-T Rec. T.87 | ISO/IEC 14495-1.

Context

This Recommendation | International Standard defines a set of lossless (bit-preserving) and lossy compression methods for coding bi-level, continuous-tone greyscale, palletized colour, or continuous-tone colour digital still images. This Recommendation | International Standard:

- specifies normative but optional encoding processes for converting source image data to JPEG 2000 compressed image data;

- specifies a complete encoding path to produce a conforming codestream as defined in Part 1 Annex A (ITU-T Rec. T.800 | ISO/IEC 15444-1);

- provides guidance on encoding processes for converting source image data to compressed image data;

- provides guidance on how to implement these processes in practice.

Requirements

This subclause contains a list of requirements for the definitions of an entry-level encoder.

An entry-level JPEG 2000 encoder implementation (this Recommendation | International Standard):

- shall be normative but optional; implementers shall be allowed to select necessary technologies/paths that would suite their application needs;

- shall define a JPEG 2000 Part 1 codestream encoder implementation; should define a JP2 file format encoder implementation;

- shall define a complete encoding path to produce a conforming codestream as defined in Annex A of ITU-T Rec. T.800 | ISO/IEC 15444-1:2004;

- shall consist of technology with clear IP status being royalty fee-free.