International organisation for standardisation organisation internationale de normalisation

m32647 Wrapping HEVC in JPX (JPEG Submission)

(Submitted to JPEG as document number wg1n6614).
(Notes that JPX carries Exif , see wg1n4491.) Thank you for the input. The author (and room) were not sure how many use cases were covered by this; it’s probably more applicable to the still images use cases (rather than sequences). The extraction use-cases are interesting, because of the sharing of data that optimizes this (including meta-data). Some applications require that meta-data be kept intact as this extraction happens.
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(Note, requirements were set in Geneva in documents w13882 (sequences) and w13823 (stills)).
In discussion with JPEG we reviewed the two contributions to MPEG again, and the JPEG contribution. We discussed about light-field imaging; perhaps multi-view could use regular codecs and suitable file format structures.

The W3C has work ongoing on ‘responsive images’ where the terminal picks the most suitable coding variant for a particular task (e.g. display related to the DPI, color gamut, etc.). We should explore what they are doing.

We should liaise anything we do with Exif to the appropriate body; TC42 was suggested, but perhaps JEITA (as the owners) would be more suitable.

We would like to verify the questions above, and whether the single-image case could/should JPX, particularly by analysis against the requirements. There is also a desire to look carefully at the meta-data support, particularly related to redundancy reduction etc. related to image sequences, and picking images out of sequences.

We note that JPX support could be developed later, additionally to the meta-box support; but we currently lack a person with the knowledge, skills, and time to develop this as a proposed specification.

We would like simple files (in concept) to be simple; and we’d also like the ‘learning curve’ to be not too steep; whether this helps us settle the direction is less clear. We would not wish to issue a CD and then change direction (though adding JPX would be fine).

We have 3 major application types: two are closely related to video, and one pure still picture. So being ‘close’ to the ISO BMFF might help. We can certainly embed a meta-box in a track and use it to ‘annotate’ video in the same way as it annotates stills.

We lean to going to CD (and discussing the results in Sapporo, as balloting won’t close before Valencia). We should load the CD into the JPEG repository as a courtesy (and also the 2 requirements documents, separately).

4.