JPEG 2000
JPEG 2000 (or JPEG2000) is standard that defines a wavelet-based raster image compression format, and a family of associated file formats, protocols, etc.
For details about specific formats, see:
- JPEG 2000 codestream
- JP2 (base still image format)
- JPX (extended still image format)
- JPM (compound image format)
- MJ2 (motion JPEG 2000)
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Disambiguation
JPEG 2000 is sometimes incorrectly used as a synonym for JP2. Although JP2 might be the most important part of the JPEG 2000 standard, it is only one small part of it.
In some contexts, JPEG 2000 is used to mean the compressed codestream format, instead of the whole standard.
Details
The JPEG 2000 standard consists of many parts, including:
- Part 1: Core coding system. Defines JPEG 2000 codestream format and the JP2 file format.
- Part 2: Extensions. Defines JPX.
- Part 3: Motion JPEG 2000 (MJ2)
- Part 6: Compound image file format (JPM)
- Part 8: JPSEC
- Part 9: JPIP
- Part 10: JP3D
- Part 11: JPWL
- Part 12: ISO Base Media File Format
Format
The JPEG 2000 file formats (JP2, JPX, JPM, and MJ2, but not the codestream format) use a hierarchical tagged format that is similar to RIFF. Unlike RIFF, the format supports objects larger than 4GB. It is also somewhat more streamable than RIFF, because it supports objects whose size is implied by the file size instead of reported in advance.
Identification
Most JPEG 2000-related files (but not the codestream format) begin with bytes 00 00 00 0c 6a 50 20 20 0d 0a 87 0a.
Specifications
See also the articles about the specific file formats. Most of the official JPEG 2000 specification is not freely available, but the committee drafts are. (Exception: Specifications for the high-level parts of the JP2 and JPX formats are freely available.)
- ISO/IEC 15444
- JPEG 2000 Committee Drafts
- ITU-T Rec.T.800: JPEG 2000: Core coding system
- ITU-T Rec.T.801: JPEG 2000: Extensions
- ITU-T Rec.T.802: JPEG 2000: Motion JPEG 2000
- ITU-T Rec.T.803: JPEG 2000: Conformance testing
- ITU-T Rec.T.804: JPEG 2000: Reference software
- ITU-T Rec.T.805: JPEG 2000: Compound image file format
- ITU-T Rec.T.807: JPEG 2000: Secure JPEG 2000
- ITU-T Rec.T.808: JPEG 2000: Interactivity tools, APIs and protocols
- ITU-T Rec.T.809: JPEG 2000: Extensions for three-dimensional data
- ITU-T Rec.T.810: JPEG 2000: Wireless
- ITU-T Rec.T.812: JPEG 2000: An entry level JPEG 2000 encoder
- ITU-T Rec.T.813: JPEG 2000: XML structural representation and reference
