As its name suggests, Part 1 defines the core of JPEG 2000. This includes the syntax of the JPEG 2000 codestream and the necessary steps involved in encoding and decoding JPEG 2000 images. The later parts of the standard are all concerned with extensions of various kinds, and none of them is essential to a basic JPEG 2000 implementation. A number of existing implementations use only Part 1.
Part 1 also defines a basic file format called JP2. This allows metadata such as colour space information (which is essential for accurate rendering) to be included with a JPEG 2000 codestream in an interoperable way. JP2 uses an extensible architecture shared with the other file formats in the JPEG 2000 family defined in later parts of the standard.
Part 1 also includes guidelines and examples, a bibliography of technical references, and a list of companies from whom patent statements have been received by ISO. JPEG 2000 was developed with the intention that Part 1 could be implemented without the payment of licence fees or royalties, and a number of patent holders have waived their rights toward this end. However, the JPEG committee cannot make a formal guarantee, and it remains the responsibility of the implementer to ensure that no patents are infringed.
Part 1 became an International Standard (ISO/IEC 15444-1) in December 2000.
It is currently available for download from ITU-T as their Recommendation T.800
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