Standards/JPX Standards JPX is an extension of the JPEG2000 image standard file format (jp2) and can be defined as the container which allows to describe the jp2 image and the associated metadata.
The objective of this format can be described in the following list [36]:
The interesting part for our goals is the definition of a set of metadata for image description and the specification of a container able to store image metadata.
Starting from the DIG35 standard, on which it is largely based, it defines an XML language that allows to represent a complete set of metadata related to the image.
The metadata elements specify information such as how the image was created, captured or digitised, or how the image has been edited since it was originally created, including the intellectual property rights information, as well as the content of the image, such as the names of the people and places in the image.
They can be grouped into four different sections and a common section for the types definition:
JPX is composed of several boxes, among which two are very interesting:
  1. the MPEG-7 Binary box.
  2. XML box.
This first box contains metadata in MPEG-7 binary format (BiM) as described in the MPEG-7 section, while the second box, already defined within the jp2 file format specifications allows to create metadata description schemes able to represent the considered MM data.
An interesting initiative is represented by the mapping between Dublin Core element set and the XML metadata used in JPX files [37].