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2014-02-11
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JPEG2000 (ISO 15444)

Presentation

JPEG 2000 is an international standard (ISO 15444) relative to image compression which is based on ondelette-compression mecanism. This compression standard was developped by ISO/JTC1 SC29. This standard ISO 15444 is composed of eleven parts:

  • 15444-1 « Core decoder » defines the basic characteristics of JPEG2000 compression;
  • 15444-2 « Extensions » defines the way of associating other informations to JPEG2000 images;
  • 15444-3 « Motion JPEG 2000 » defines the use of JPEG 2000 for moving images;
  • 15444-4 « Conformance testing » presents the conformance test for JEPG 2000 images;
  • 15444-5 « Reference software » proposes two free softwares to explote JPEG2000, one developped in C and the other in Java.
  • 15444-6 « Compound Image File Format » permits ot compose different types of images (grey-scale, color-coded...) which relates to the same phenomenon.
  • 15444-8 « Secure JPEG 2000 » presents the way to protect JPEG2000 data ;
  • 15444-9 « Interactivity Tools – API & protocole (JPIP) » defines a protocole for JPEG 2000 images ;
  • 15444-10 « JP3D » : 3D JPEG 2000 images and the encoding of images with floating values;
  • 15444-11 JPEG 2000 image coding system: Wireless ;
  • 15444-12 JPEG 2000 image coding system -- Part 12: ISO base media file format (equivalent to the standard ISO 14496-12 (format MP4)).

JPEG2000 file formats

This a list of format of JPEG 2000 family:

  • *.jp2 (standard ISO15444-1) ;
  • .jpx (.jpf for Microsoft Windows) standard ISO 15444-2 ;
  • *.mj2 for standard ISO 15444-3 ;
  • *.jpm for standard ISO 15444-6.

JPEG 2000 and geographic information standards

OGC experts lobbied ISO JTC1 SC24 to promote GML format. as a result, OGC published GMLJP2 specification in 2005.

Nevertheless, this is based on OGC GML3.1.1 and has not up to now been aligned with GML3.2.1 (ISO 19136 : GML). In addition to this GMLJP2 has not been accepted by ISO up to now.