JVET-AP0094 AHG9: On the scalability dimension information SEI message in VSEI TuC [J. Xu, Y.-K. Wang (Bytedance)]

This document proposes the following items to the scalability dimension information SEI message described in the latest VSEI TuC:

1) Add a constraint for sdi_aux_id[ i ] in the range of 128 to 159, inclusive.

2) Add a constraint on the associated layer of a confidence map.

3) Modify the semantics of the confidence value considering the signal range and monotonicity.

It was suggested to allocate some Reserved values of sdi_aux_id[ i ] to unspecified while allowing association with a non-primary layer.

Agreed on item 1.

It was noted that alpha or depth can be primary layers. action on item 2.

Item 3 chaired by S. Deshpande.

For item 3, it was suggested that it is awkward to have to refer to the VUI to be able to interpret the SEI message. It was suggested that an option would be to signal a min and max value in the SEI message.

Agreed to add final proposed bullet of item, and to remove the two middle bullets, and add an editor’s note to study the min and max values.

Further study encouraged about determination of min and max, especially for determination of full confidence.

JVET-AP0094 AHG9: On the scalability dimension information SEI message in VSEI TuC